最新刊期
卷 57 ， 期 1 ， 2026
- 摘要：The development of plastics that exhibit outstanding impact resistance and toughness at cryogenic temperatures remains a long-standing challenge in materials science. Most conventional plastics become brittle at cryogenic temperatures due to restricted chain mobility and reduced energy dissipation, which severely limits their applications in extreme low-temperature environments such as aerospace, polar exploration, liquefied gas storage and transport, superconducting systems, quantum technologies, and advanced biomedical cryogenics. Recently, Jun-qi Sun and co-workers report a significant breakthrough in the design of ultra-tough poly(urea-urethane) (PUU) material with unprecedented impact resistance across a broad cryogenic temperature range. These PUU materials are fabricated by cross-linking soft poly(tetramethylene ether glycol) (PTMEG) chains with multiple types of hydrogen bonds and hydrogen-bond aggregates of varying binding energies. The resulting PUU features a bicontinuous, phase-separated nanostructure, where hydrogen-bond-cross-linked, rigid yet deformable domains are interpenetrated with soft PTMEG chains. At -50 ℃, the material exhibits mechanical properties comparable to those of ultra-tough, high-strength plastics at ambient temperature, with a yield strength of 81.1 MPa, breaking strength of 133.0 MPa, Young's modulus of 1.5 GPa, and breaking strain of 220.9%. A 0.3-mm-thick plastic sheet achieves a maximum impact force of 667.8 N and an impact energy of 3.8 J at -50 ℃, markedly surpassing those of existing impact-resistant plastics. Meanwhile, PUU materials exhibit remarkable mechanical robustness and flexibility at -196 ℃, even under high loads and repeated thermal shocks between -196 ℃ and room temperature. Moreover, the hydrogen-bond-cross-linked PUU also possesses outstanding water resistance, self-healing capability and reprocessability. The key innovation of this study lies in the strategic integration of multiple types of hydrogen bonds and hydrogen-bond aggregates with a broad spectrum of binding energies, which act as sacrificial and adaptive cross-links within the PUU materials. These dynamic interactions work cooperatively to enable bond dissociation while preserving chain mobility, thereby allowing efficient energy dissipation even at extremely low temperatures.关键词：Reversibly cross-linked polymers;Impact-resistant plastics;Low-temperature toughness;Recyclable polymers281|151|0更新时间：2026-01-16
Highlight
- 摘要：High-performance polymers are key material foundations for the development of industries such as aerospace and energy electronics. The precise control of the microstructure and performance of functional materials by regulating the structure and properties of polymers through molecular design, thereby enhancing the overall performance of target devices, is an important scientific issue and research frontier in the field of high-performance polymers. This feature article briefly introduces the research progress of Professor Jian's team on the synthesis and properties of the phthalazinone-containing polyarylether series of high-performance engineering plastics, as well as their applications in high-performance resin-based composite materials, insulating materials, high-temperature-resistant functional membranes, toughening of thermosetting resins, electrochemical energy storage, and bone implant materials. A new monomer with a twisted, nonplanar structure containing a naphthalene-biphenyl structure was successfully developed through molecular design. This monomer was then reacted with phthalazinone monomers through nucleophilic substitution stepwise polymerization to synthesize a series of novel polyarylether-based high-performance engineering plastics with phthalazinone structures. These materials exhibit excellent solubility and heat resistance, overcoming the technical challenges of combining thermal resistance and insolubility in traditional high-performance engineering plastics. This not only reduces the production cost of high-performance polymers but also enables their solution processing. Their glass transition temperatures range from 250 ℃ to 388 ℃, with the onset temperature of 5% thermal weight loss exceeding 500 ℃. They are soluble in organic solvents such as N-methylpyrrolidone, N,N-dimethylacetamide and chloroform. They exhibit outstanding comprehensive performance, particularly in maintaining excellent properties at high temperatures. It is widely applied in high-tech fields such as aerospace, nuclear energy, electronics, and electrical engineering, as well as in numerous sectors of the national economy.关键词：Phthalazinone;High-performance resin;Heterocyclic poly(arylether);polymer material;Molecular design130|68|0更新时间：2026-01-16
- 摘要：Under the background of the national dual-carbon goal strategy and the sustainable development of polymers, non-food biomass materials represented by cellulose are considered the primary raw materials for the future chemical industry, bio-based materials, and biomass energy. Due to the characteristics of its supramolecular structure, natural cellulose does not melt and is difficult to dissolve. Traditional cellulose processing and derivatization processes are often complex and highly polluting, significantly limiting the widespread application of cellulose materials. Developing effective solvents for cellulose to achieve efficient conversion, green processing, and functionalization of natural cellulose is an important pathway for the high-value utilization of cellulose. The development of new cellulose solvents has always been one of the most active research topics in the field of cellulose science. The discovery of ionic liquids as a novel and efficient cellulose solvent system has provided a highly efficient, green, and platform-based new method for fundamental research on cellulose science, as well as for processing and derivatization. Significant progress has been made in various areas, bringing renewed vitality to this "ancient" material. In recent years, research on the application of ionic liquids in cellulose materials has become more in-depth and extensive. This feature article briefly summarizes the related research achievements of our group over the past few years, including progress in the dissolution and solution behavior of cellulose in ionic liquids and their co-solvents, cellulose crystallization, processing of low-cost cellulose raw materials, and the fabrication of new functional cellulose materials.关键词：Cellulose;Ionic liquids;Green processing;Derivatization;Functional materials158|259|0更新时间：2026-01-16
Feature Article
- 摘要：As a high-performance special engineering plastic, semi-crystalline poly(arylene ether nitrile) (PEN) has shown broad application prospects in cutting-edge fields such as dielectrics, optical devices, and thermal management materials owing to its excellent mechanical strength, chemical corrosion resistance, flexibility, and electrical insulation. The quality of its performance fundamentally depends on the design of the molecular chain structure and the precise regulation of the aggregated structure. In recent years, researchers have optimized its crystallization behavior through molecular engineering strategies, such as main chain modification and copolymerization modification, and synergistically improved material performance using physical and chemical methods, such as nucleating agent regulation and external field (thermal field, stress field) induction, which has become a research hotspot in this field. This paper systematically reviews the research methods of polyarylene ether nitrile crystallization behavior, focusing on the latest research progress of crystalline polyarylene ether nitrile, and discusses the influence mechanism of structural regulation on its thermal stability, mechanical properties, and micro-morphology. By comparing the advantages and disadvantages of different modification strategies, the future development direction of "multi-scale collaborative design" is proposed, aiming to provide theoretical guidance and technical support for the development of a new generation of high-performance polyarylene ether nitrile materials.关键词：Poly(arylene ether nitrile);Research method;Structural regulation;Crystallization property189|48|0更新时间：2026-01-16
- 摘要：Phase change cold storage, as the passive refrigeration, is an important preservation technology that maintains the low-temperature environment to prevent the decay and deterioration of biomass agricultural products such as fruits, vegetables, and fresh food. Water is the most commonly used phase change material. However, it encounters the problem, such as easy flowing and leakage, when ice melts into water, making it difficult to apply in cold chain transportation which requires the high environmental cleanliness. This review introduced the novel environmental-friendly poly(vinyl alcohol) (PVA) based cold chain materials. It utilized the hydration of PVA to control the water state, and incorporated the super absorbent polymer (SAP) to improve the water storage of the system. We prepared PVA based foam materials via self-innovated thermal processing and water foaming technology, which increased the specific surface area. Constructing multiple hydrogen and multi-level network structure through in situ polymerization, combined with the capillary action, could improve the water absorption and retention capacity of the system, preventing the water flowing under the situation of ice melting and certain external force. We achieved the novel PVA based cold chain materials with excellent comprehensive performance, which possessed the high latent heat of 324.7 J/g. It could maintain the uniform and stable temperature field, exhibiting the better cold retention effect than ice cube. It could be reused and fabricated into the desired shape, showing important applications in the rapidly developing fruit and fresh cold chain logistics in China.关键词：Cold chain material;Poly(vinyl alcohol);Phase change material;Foaming;Hydration247|224|0更新时间：2026-01-16
- 摘要：Polyamide fiber was the first synthetic fiber to achieve industrial-scale production and remains the second most widely produced synthetic fiber. Its high tensile strength, large elongation at break, and excellent resilience make it widely applicable in textiles and apparel, industrial yarns, home textiles, and specialized protective applications. With the advancement and innovation of industrial technology, conventional polyamide fibers struggle to meet the performance demands of certain specialized applications because of their relatively low tensile strength. The amide bonds between adjacent molecular chains in polyamides readily form hydrogen bonds, resulting in strong intermolecular interactions. This makes it difficult to achieve highly oriented structures through high-ratio drawing, thereby limiting the strength enhancement. To overcome the mechanical performance limitations of polyamide fibers within existing spinning systems, it is essential to understand the process-structure-property triadic relationship and precisely control the multilevel structure of polyamide fibers, thereby achieving high reinforcement. This review examines the multiscale structural evolution of fibers during the three critical spinning stages (melt extrusion, drawing, and thermal setting) and investigates the regulatory mechanisms of spinning parameters on their structure-property relationships. This study aims to provide theoretical guidance for the process design of high-strength polyamide fibers.关键词：Polyamide fiber;Condensed-phase structure;High performance;Melt spinning212|255|0更新时间：2026-01-16
- 摘要：Polyurethane, as an outstanding synthetic material, has extensive applications in various fields. Due to its excellent biocompatibility, mechanical properties and structural designability, polyurethane is demonstrating increasingly valuable in biomedical field in recent years. The biomedical applications of polyurethane have extended to a wide range of devices, including short-term contact catheters and cardiovascular assistive devices, as well as implantable artificial organs. This review summarizes the basic characteristics of polyurethane, introduces the commercial products, and focused on the innovative study in the cardiovascular implant field, including medical catheters, vascular stents, artificial blood vessels and heart valves, and providing guidance for the development of polyurethane materials.关键词：Polyurethane;Biomedical material;Cardiovascular devices;Implant device200|201|0更新时间：2026-01-16
- 摘要：High-performance porous organic polymers (POPs) are advanced porous materials with three-dimensional network structures and tunable functionalities, formed by covalent bonding of organic monomers. They possess excellent properties such as high chemical stability, large specific surface area, and easy functional modification, making them highly effective in gas adsorption, catalytic reactions, environmental remediation, and addressing energy scarcity, thus becoming key materials for solving global challenges. However, their development toward controllable preparation and stable industrial production is hindered by critical bottlenecks: traditional synthesis relies on toxic, highly volatile organic solvents (e.g., dichloromethane), harsh conditions (120-250 ℃, 5-10 MPa) causing high energy consumption and long reaction cycles, while most POPs are insoluble and infusible powders due to covalently cross-linked rigid networks, making precise structural regulation and subsequent processing difficult. Driven by the "dual carbon" goal and the need for sustainable development, green preparation (focused on "raw materials→primary POP products") and processing (focused on "primary POP products→end-use functional materials") of POPs have become essential to overcome these bottlenecks. This review first elaborates on the core principles of green preparation and processing: using renewable resources (biomass-derived monomers, CO2) as raw materials, adopting mild conditions (room temperature, atmospheric pressure) to reduce energy consumption, designing recyclable routes to minimize waste, and optimizing reactions to improve atomic economy. It then addresses current challenges (complex fabrication, uncontrollable synthesis, poor processability, unclear structure-function relationships) by highlighting latest progress: aqueous sol-gel synthesis and molten salt polymerization for green preparation; solution processing strategies (charge-induced dispersion, thermally induced hypercrosslinking) and dynamic covalent bond-based recycling/reshaping for green processing; and enhanced photocatalytic efficiency/selectivity via heterojunction construction. Finally, future directions are proposed: expanding renewable raw materials and continuous processes for low-cost large-scale production; applying AI/machine learning to shift from "experience-driven" to "data-driven" research; extending external field-assisted technologies (ultrasound, electric/magnetic/light fields); and developing degradable materials and closed-loop recycling to achieve full-life-cycle greenization, aiming to promote POPs' industrial application and their role in addressing global environmental and energy issues.关键词：High-performance porous organic polymers;Green;Gel;Aqueous-phase synthesis228|77|0更新时间：2026-01-16
Review
- 摘要：Precise capping of liquid polybutadiene was achieved by silica hydrogenation reaction, and trimethoxysilane terminated (TMSLPB) and triethoxysilane terminated (TESLPB) liquid polybutadiene rubbers were successfully synthesised. The effects of the above liquid rubbers as interfacial modifiers of silica-filled styrene-butadiene rubber/butadiene rubber (SBR/BR) on the properties of the composites were investigated. The results showed that TMSLPB and TESLPB could significantly attenuate the agglomeration phenomenon of silica, improve the dispersion of filler, and enhance the rubber composite properties. In addition, the mechanical properties of SBR/BR rubber composites were the best when 3 phr of TESLPB was used as plasticiser, with the lowest loss factor value at 60 ℃ and the smallest abrasion loss.关键词：Silane terminated liquid polybutadiene;Silica;Styrene butadiene rubber;Liquid rubber210|184|0更新时间：2026-01-16
- 摘要：Sacrificial bonds, including ionic bonds, are often used to regulate the mechanical properties and self-healing behavior of rubber materials. However, the strain-softening mechanism of vulcanizates and their nanocomposites involving ionic crosslinking bonds has rarely been studied. Herein, 2-acrylamino-2-methylpropanesulfonic acid, zinc oxide, and dicumyl peroxide were used to prepare nitrile rubber vulcanizates and their carbon black nanocomposites cured by ionic and covalent crosslinks to investigate the effects of ionic crosslinking bonds on crosslinking density, mechanical properties, and strain softening behaviors (Payne effect and Mullins effect). The results showed that the introduction of ionic crosslinking bonds could improve the crosslinking density and modulus, reduce the frequency dependence of the storage modulus in the linear viscoelasticity region, weaken the strain softening behavior in the nonlinear viscoelasticity region, and promote the intracycle strain hardening and shear thickening-thinning transition accompanying the Payne effect. The ionic crosslinking bond also significantly enhanced the Mullins effect of the vulcanizates and their nanocomposites, and the cyclically deformed materials after a short-term (10 min) thermal treatment at a low temperature (60 ℃) do not soften when subjected to cyclic stretching. The results provided an experimental basis for studying the strain softening mechanism of covalently and ionically crosslinked rubbers and their nanocomposites for regulating nonlinear viscoelasticity.关键词：Vulcanizates;Ionic crosslinking bonds;Nanocomposites;Strain softening202|160|0更新时间：2026-01-16
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Fluoroalkylation FeOOH/PVDF Mixed Matrix Membrane: Preparation and Membrane Distillation Performance
摘要：Membrane distillation (MD) is the key technique for resource extraction from high concentrate solutions. Hydrophobicity and pore size uniformity of the membranes are critical factors to solve membrane wetting problem and ensure the highly efficiency of MD process. In this work, a new idea of functionalisation of additives during dissolution process and modification of crystallization transformation of membrane materials during phase separation was proposed. Iron hydroxide oxide (F-FeOOH) nanorods were introduced in PVDF casting solution and fluorosilanated during the dissolution process. Then, the crystallization of the PVDF was modified owing to the interaction between the groups of modified nanorods and PVDF chains. The problem of nanorods aggregation could be solved, the hydrophobicity and pore size uniformity could be improved simultaneously just in traditional phase separation process. The effects of F-FeOOH synthesis on the variation of membrane structure and properties were investigated. The results demonstrated that the hydrophobicity of the F-FeOOH modified membranes were significantly enhanced, with the formation of a spherical particle structure on the down-surface and high pore size uniformity of the membranes. The water contact angle of the membranes could reach 135.5°, which was enhanced 42.6%, the percentage of the most probable pore size of the modified membrane increased to 98.4%, the MD flux reach 38.5 kg/(m2·h), which was improved by 75.0%, and the retention rate for salt was kept over 99.9%. The modified membrane showed persistent stability in 30 h anti-fouling and anti-wetting experiments.关键词：F-FeOOH;Poly(vinylidene fluoride);Hydrophobic microporous membrane;Membrane distillation;Membrane wetting171|212|0更新时间：2026-01-16 -
Preparation and Properties of Room Temperature Curing Polyurethane for Conveyor Belt Repair Adhesive
摘要：Rubber conveyor belts are often affected by wear, which impacts their normal use. Castable polyurethane and other materials are commonly used as repair adhesives for on-site repairs of the worn areas. However, the peeling strength of existing polyurethane repair adhesives to rubber is difficult to meet the practical requirement,and the relationship between the structural composition and peeling strength of the castable polyurethane is not fully investigated. Therefore, based on the above issues, in this work, a room temperature curable polyurethane coating was successfully prepared using the prepolymer method, and the adhesive performance between the coating and the rubber was simultaneously investigated from the perspectives of molecular cohesion, wettability, and microstructure of the interface, which indicated that the higher the content of hard segments, the stronger the molecular cohesion, and the coating formed after the curing of polyurethane exhibits better adhesion to the rubber matrix, with a T-type peel strength of up to 11.73 N/mm. Low-viscosity polyurethane is beneficial for wetting the rubber surface and resulting in good adhesion, and the appropriate thickness of the adhesive layer is key to achieving good adhesion. In addition, the effects of soft and hard segment content on the tensile properties, wear resistance, and hardness of the polyurethane coatings were also investigated, providing the theoretical support for the preparation and performance regulation of the polyurethane coatings. This polyurethane coating is expected to serve as a rubber repair adhesive, enabling rapid repair of rubber conveyor belts at room temperature.关键词：Castable polyurethane;Room temperature curing;Hard and soft segment content;Viscosity;Cohesion160|144|0更新时间：2026-01-16 - 摘要：To address the insufficient toughness of commercial bisphenol A epoxy resin (DGEBA/MXDA), an epoxy-terminated hyperbranched poly(arylene ether ketone) (O-HBP) was designed and synthesized, and its effects on the curing behavior, thermal/thermomechanical properties, and mechanical performance of epoxy resins were systematically investigated. First, a hydroxyl-terminated hyperbranched poly(arylene ether ketone) (HBP-OH) was obtained by the polycondensation of 2,4,6-tris(4-hydroxyphenyl) pyridine (HPP) with 4,4'-difluorobenzophenone (DFK), followed by grafting with ethylene glycol diglycidyl ether (EGDE) to yield O-HBP. Structural characterization by Fourier transforms infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1H-NMR) confirmed the successful construction of the target structure. Subsequently, O-HBP was incorporated into the DGEBA/MXDA system at different loadings (0 wt%-8 wt%). The results indicated that O-HBP reduced the apparent activation energy of curing. Rheological measurements showed that the modified systems maintained low viscosity at 30-90 ℃ and exhibited a rapid rise and subsequent stabilization of viscosity at 100-110 ℃, indicating sufficient cure. Thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) demonstrated negligible impact on thermal stability, while the glass transition temperature (Tg) first increased and then decreased with loading, reaching a maximum of approximately 102.9 ℃. Dynamic mechanical analysis (DMA) revealed that an appropriate amount of O-HBP significantly increased the initial storage modulus. Mechanical testing showed optimal overall performance at 4 wt%-6 wt% O-HBP: the maximum improvements in tensile strength, flexural strength, and impact strength were approximately 10.3%, 63.1%, and 177.6%, respectively. Scanning electron microscopy (SEM) and atomic force microscopy (AFM) observations revealed pronounced pull-out features, shear-yield textures, and nanoscale phase separation of 30-100 nm, elucidating energy absorption and crack deflection/branching mechanisms. This work provides a structurally designable and easily processable hyperbranched polymer strategy for efficient toughening and processing optimization of epoxy resins.关键词：Hyperbranched poly(arylene ether ketone);Epoxy resin;Toughening;Curing kinetics;Nanoscale phase separation200|157|0更新时间：2026-01-16
- 摘要：In this study, 4-fluoro-3-trifluoromethylphenol was used as a monomer and diphenylsulfone was used as a reaction solvent to successfully synthesize high molecular weight fluoropolyarylene (CF3PPO). The number average molecular weight of fluoropolyarylene (CF3PPO-0.52) reached 7.74×104 Da, weight average molecular weight reached 2.49×105 Da, melting point was 243 ℃, and glass transition temperature (Tg) was 112 ℃. At the same time, this work studied the influence of molecular weight on the crystallization properties of fluoropolyarylene materials. High molecular weight polymer crystallization is slow and needs to be heat treated to crystallize. The tensile strength of the injection molded spline was 82 MPa, and the elongation of break was 134%; after heat treatment, the tensile strength increased to 96 MPa, but the elongation of break is reduced to 9%. In addition, since the polymer has both the structural characteristics of benzene ring and fluorine atoms, the dielectric constant of the crystalline polymer film is as high as 4.32, and the polymer film has a lower dielectric loss at high frequencies, and the dielectric loss at 106 Hz is only 0.0017.关键词：4-Fluoro-3-trifluoromethylphenol;Fluorinated polyarylether;Heat treatment crystallization;Mechanical properties;Dielectric properties243|118|0更新时间：2026-01-16
- 摘要：Amorphous poly(aryl ether ketone) (PAEK) is increasingly vital in the separation membrane field owing to its excellent organic solvent solubility, film-forming properties, outstanding gas permeability, and superior mechanical performance. However, its application is limited by hydrophobicity. In this study, PAEK (PPL-PHT) copolymers with varying carboxyl group contents were synthesized by adjusting the molar ratio of phenolphthalein (PHT) to phenolphthaleinline (PPL) in a ternary copolymerization. PPL-PHT hollow fiber ultrafiltration membranes were prepared by coaxial wet spinning. The copolymers were structurally characterized using Fourier-transform infrared (FTIR) and proton nuclear magnetic resonance (1H-NMR) spectroscopy. Their thermal properties were investigated using differential scanning calorimetry and thermogravimetric analysis. The fiber morphology, surface hydrophilicity, and mechanical properties were examined using scanning electron microscopy, water contact angle measurements, and universal testing machines. The antifouling performance was tested using bovine serum albumin (BSA) and humic acid (HA) as test media. The results indicate the successful synthesis of PPL-PHT copolymers with tunable carboxyl content and excellent thermal stability, meeting the requirements for separation membranes. With increasing carboxyl content, the fiber membranes exhibited progressively enhanced tensile strength, elongation at break, hydrophilicity, and fouling resistance. When the molar ratio of PPL to PHT was 50:50, the fiber membrane exhibited a rejection rate of 99.2% for bovine serum albumin while maintaining a flux recovery rate of 53.2%. For HA, the rejection rate was 97.5%, and the flux recovery rate was 94.2%. These results are promising for industrial applications in separation processes.关键词：Hollow fiber;Ultrafiltration membranes;Copolymerization;Poly(aryl ether ketone);Antifouling properties147|101|0更新时间：2026-01-16
- 摘要：Styrene-isoprene/butadiene-styrene block copolymer (SI/BS) and its hydrogenated product (SEEPS) are high-value-added thermoplastic elastomers (TPS). However, the structure-thermal property relationship remains unclear. In this study, a series of SI/BS were synthesized via anionic solution polymerization by adjusting monomer feed ratios and feeding methods (stepwise feeding versus one-step feeding), which were further hydrogenated to obtain SEEPS with different hydrogenation degrees (HD). The results indicated that composition and number-average molecular weight (Mn) had no significant effect on the glass transition temperature (Tg) and decomposition temperature (Td) of SI/BS, though Tg was slightly modulated by the Bd content. Further investigation into the effects of Mn, composition, HD, and feeding methods on the thermal properties (Tg, Tm, Tc, Td) of SEEPS revealed that hydrogenation significantly enhanced thermal performance when HD was below 60%, while minimal changes could be observed above this threshold. At HD>95%, Tg and Td were insensitive to variations in Mn and composition. However, both crystallization temperature (Tc) and melting temperature (Tm) increased notably with higher Bd content. Moreover, SEEPS prepared via the stepwise feeding method exhibited higher Tc and Tm. Combining 13C-NMR analysis and Bd/Ip copolymerization kinetics, it was inferred that the feeding method regulates the monomer sequence distribution of Bd and Ip, thereby influencing the segmental structure of hydrogenated SEEPS.关键词：Thermoplastic elastomer;Styrene-isoprene/butadiene-styrene block copolymer;Thermal properties227|220|0更新时间：2026-01-16
- 摘要：In response to the persistent public security threat posed by nitroaromatic explosives, developing highly sensitive and selective detection methods is crucial. The development of nonconjugated polymers with novel structures and unique sensing mechanisms remains a major challenge in this field. This study investigated a class of emerging unsaturated polymers with non-traditional luminescent properties, polypropenylene, as a fluorescent probe, examining the structure-activity relationship between the backbone structure and side-chain functional groups (phenyl and halogenated phenyl) regarding their fluorescence response to nitroaromatic compounds. The results demonstrated that this series of polymers exhibited significant dynamic fluorescence quenching toward 2,4,6-trinitrophenol (TNP), 2,4,6-trinitrotoluene (TNT), and nitrobenzene (NB). Among them, the response to TNP was particularly outstanding, with a quenching constant (Ksv) as high as 1.43×106 L/mol and a detection limit (LOD) as low as 1.54×10-7 mol/L, outperforming most reported fluorescent sensing materials in terms of overall performance. More importantly, mechanistic studies revealed that the exceptional sensing performance originated from the hyperconjugation effect in the backbone of P3-PhAY and the halogen atoms in the side chains of P2-4FPhAY, P2-4ClPhAY, and P2-4BrPhAY, which collectively enhanced the photoinduced electron transfer (PET) process. Moreover, a unique fluorescence resonance energy transfer (FRET) pathway with TNP endows the system with ultra-high selectivity. This study not only provides a high-performance probe for explosive detection but also offers a novel strategy and theoretical foundation for designing a new generation of non-conjugated polymer-based fluorescent sensors by elucidating the "structure-mechanism-performance" relationship.关键词：Polypropenylene;Explosives detection;Fluorescence quenching;Photoinduced electron transfer;Fluorescence resonance energy transfer131|48|0更新时间：2026-01-16
- 摘要：Under the context of circular material economy, this study developed a series of oxygen vacancy-tunable TiO2-based catalysts to enable green synthesis and in-situ closed-loop recycling of bio-based poly(ethylene 2,5-furandicarboxylate) (PEF). By precisely regulating oxygen vacancy density on TiO2 catalyst surfaces, catalytic activity for the polymerization reaction between 2,5-furandicarboxylic acid (FDCA) and ethylene glycol was significantly enhanced, successfully producing high intrinsic viscosity PEF ([η]=0.728 dL/g). The catalytic system innovatively drove PEF depolymerization under mild conditions without additional catalysts, achieving complete depolymerization. Depolymerized products could be directly repolymerized, yielding recycled PEF (rPEF, [η]=0.864 dL/g) with performance comparable to virgin material. The full-cycle polymerization-depolymerization-repolymerization process overcame energy and cost barriers in traditional polyester recycling, with its core mechanism lying in dynamic regulation of catalytic active sites by oxygen vacancy defects. This work provides an atomically economical and industrially viable strategy for addressing sustainable production and circular utilization challenges of bio-based polyesters.关键词：Bio-based polyesters;PEF catalysts;Defective nano-TiO2;Closed-loop Recycling193|118|0更新时间：2026-01-16
- 摘要：With the continuous advancement of current technology, there is a growing demand for lithium metal batteries (LMBs) to operate under extreme conditions. However, existing electrolyte systems generally suffer from poor thermal stability, significant interfacial side reactions, and insufficient ionic conductivity at low temperatures. Achieving safe operation and long-term cycling stability in harsh environments remains a major challenge, necessitating the development of high-temperature-resistant solid electrolytes. This study proposed a dual-functional strategy based on a non-flammable electrolyte that achieved exceptional thermal stability and high ionic conductivity through the synergistic effect of intrinsic flame-retardant properties and interfacial modulation mechanisms. Leveraging its self-purification capability and the formation of a robust, inorganic-rich interphase layer, the electrolyte effectively ensured the safety and stability of lithium metal batteries under high-temperature conditions. The experimental results demonstrated that the LFP/GPE/Li cell exhibited a nearly unchanged capacity after 100 cycles at 60 ℃. Furthermore, at a low temperature of -20 ℃, the LFP/GPE/Li cell could stably cycle 100 times at a current density of 0.1 C, and the assembled pouch cell remained capable of continuously driving an LED screen under extreme conditions, such as bending, folding, and cutting. In summary, the GPE electrolyte system developed in this study offers an effective solution for lithium metal batteries with high safety and stability over a wide temperature range.关键词：Gel polymer electrolyte;Wide-temperature-range;High Safety;Stable interface layer112|49|0更新时间：2026-01-16
- 摘要：A series of novel N-heterocyclic olefin-functionalized phosphines (NHO-P) were successfully designed and synthesized. The chemical structures of NHO-P were thoroughly characterized using 1H-, 13C-, and 31P-nuclear magnetic resonance spectroscopy and high-resolution mass spectrometry. Binary organic systems consisting of NHO-P and triethyl boron (Et3B) were constructed to catalyze the ring-opening alternating copolymerization of propylene oxide (PO) and phthalic anhydride (PA). The results showed that under the conditions of PO:PA:NHO-P:Et3B = 2000:800:1:1 (molar ratio), at 60 ℃, the electron-rich NHO-P4 could quantitatively convert the anhydride. The resulting polyester exhibited a high molecular weight of up to 126.3 kg·mol-1, a polymer dispersity index of 1.25, and more than 99% ester units. Furthermore, the alternating copolymerization reaction mechanism was thoroughly investigated using NMR spectroscopy and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. The results demonstrated that NHO-P, acting as an organic base, followed an anionic polymerization pathway to initiate the ring-opening alternating copolymerization reaction, enabling the efficient preparation of polyester materials with a perfectly alternating structure.关键词：N-heterocyclic olefin;Phosphine;Organocatalysis;Ring-opening polymerization;Polyester179|79|0更新时间：2026-01-16
- 摘要：Owing to its excellent electrical, mechanical, and optical properties, biaxially oriented polypropylene (BOPP) films are widely used in fields such as packaging, electrical engineering, and medical care. Ultra-high strength and ultra-thinness represent the cutting-edge directions in plastic film processing. However, in the traditional one-step biaxial stretching process, the molecular chains struggle to respond promptly to macroscopic strain under high stretch ratios, making it difficult for them to disentangle. This easily leads to stress concentration and subsequent film breakage, posing challenges to the preparation of ultra-high-strength and ultra-thin polypropylene films. In this study, isotactic polypropylene (iPP) castings were used as raw materials, and synchronous biaxial stretching technology was adopted. An intermittent stretching process featuring "stretching-pausing-restretching" was designed, where relaxation was introduced during the stretching process. By regulating the intermittent temperature and intermittent time, the relaxation degree was controlled, and the effects of relaxation on the stretching process, crystalline structure, and mechanical properties of BOPP were investigated. The results showed that the introduction of relaxation during the stretching process provided time for the conformational adjustment of molecular chains, effectively alleviating local stress and increasing the maximum stretch ratio. There existed an optimal relaxation state that balances the competition between molecular chain disentanglement and the formation of new crystals. Using this stretching process, BOPP films with high stretch ratios, higher mechanical strength, and thinner thickness could be obtained. This work provides a new process and technology for the preparation of ultra-high-strength, ultra-thin, and high-performance BOPP films.关键词：Biaxially oriented polypropylene;Disentanglement;Intermittent stretching process272|169|0更新时间：2026-01-16
- 摘要：Poly(phthalazinone ether sulfone ketone) (PPESK), a high-performance engineering plastic with excellent thermal stability and good solubility, shows promising potential in biomedical applications. Efficient purification is a key technology in the preparation of biomedical materials. In this study, PPESK was synthesized via nucleophilic substitution step-growth polymerization, and the impurity content in the crude product was minimized by optimizing the reaction termination conditions. To remove residual metal ions and organic impurities, various purification methods were applied to the crude PPESK, and the resulting materials—water-washed PPESK (PPESK-W), heated water-washed PPESK (PPESK-HW), and ultrasonically heated water-washed PPESK (PPESK-UHW)—were systematically characterized in terms of impurity content and biocompatibility. Results demonstrated that ultrasonic heating significantly enhanced impurity removal efficiency, reducing the contents of potassium, calcium, sodium, and iron to 77.3, 254.2, 115.1, and 22.8 mg/kg, respectively. The total concentration of heavy metals relevant to biocompatibility was reduced to 18.67 mg/kg, and the total volatile organic compounds (TVOC) decreased to 5 mg/kg. Biocompatibility was evaluated through MTT, CCK-8, live/dead cell staining, and cell adhesion assays. Compared to the unpurified PPESK, PPESK-UHW exhibited reduced cytotoxicity, promoted cell proliferation, higher cell viability, and well-spread cytoskeletal structures with favorable morphological development. This study confirms that ultrasound effectively facilitates impurity removal, providing a critical technical foundation for producing high-purity, highly biocompatible medical-grade PPESK materials.关键词：Poly(phthalazinone ether sulfone ketone);Purification;Biomaterials;Ultrasonication;Biocompatibility137|85|0更新时间：2026-01-16
- 摘要：With the rapid advancement of 3D printing technology and its expanding application fields, there is an increasing demand for dimensional stability in printed components. However, volume shrinkage during UV rapid curing significantly limits the applicability of this technology. A series of bifunctional vinyl ether monomers—di(ethylene glycol) divinyl ether (DVE2), tri(ethylene glycol) divinyl ether (DVE3), 1,4-butanediol divinyl ether (BDOVE), and 1,4-cyclohexanedimethanol divinyl ether (CHDM)—were blended with a poly(urethane acrylate) (PUA) oligomer and reactive diluent monomers. A free radical/cationic hybrid photopolymerization system was employed to construct a three-dimensional network, effectively suppressing shrinkage induced by stress concentration. The vinyl ether/acrylate hybrid resin systems exhibited relatively low curing shrinkage. Among them, the PUA-CHDM resin incorporating 1,4-cyclohexanedimethanol divinyl ether showed a curing shrinkage of only 7.14%, which is significantly lower than that of commercial photocurable resins (≈10%). In addition, this system achieves rapid curing within 60 s, along with excellent mechanical properties (tensile strength >70 MPa) and high thermal stability (glass transition temperature, Tg=227 °C). At 15 GHz, it exhibited a dielectric constant (Dk) of 2.72 and a dielectric loss (Df) of 0.0159. The PUA-CHDM formulation was selected as a dielectric ink and combined with nano-silver to produce printed circuits with good electrical conductivity. This work provides a photopolymer solution for high-precision additive manufacturing that integrates rapid curing, high mechanical strength, and superior dielectric properties, demonstrating promising potential for applications in microelectronic packaging and high-frequency communication devices.关键词：Vinyl ether;Acrylate;UV-curing;Low shrinkage117|98|0更新时间：2026-01-16
Research Article
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