最新刊期
卷 57 ， 期 2 ， 2026
- 摘要：The recycling and high-value utilization of plastic waste have become a global concern. Among them, polyolefin plastics, represented by polyethylene (PE), polypropylene (PP), polystyrene (PS), and poly(vinyl chloride) (PVC), are particularly challenging to degrade in the natural environment due to their chemical inertness, making chemical recycling highly demanding. This review systematically summarizes recent advances in the chemical upcycling of polyolefins via carbon chain cleavage, with a focus on the mechanistic roles of various catalytic systems in directing degradation pathways and product selectivity. By optimizing reaction conditions, such as temperature control and catalyst design, and integrating emerging technologies including photocatalysis and bio-chemical hybrid strategies, plastic waste can be efficiently transformed into high-value chemicals, such as alkyl aromatics, carboxylic acids, and benzoic acid. Looking ahead, there is an urgent need to develop low-cost, highly stable catalysts, further improve process efficiency, and promote the scalable implementation of chemical recycling, thereby enabling the sustainable management of plastic waste.关键词：Plastic Recycling;Polyolefins;Chemical upcycling;Catalytic degradation;C―C bond cleavage260|428|0更新时间：2026-02-01
- 摘要：Black polyimide (BPI), a novel critical material, has emerged prominently in the field of flexible organic electronics, showing broad application prospects, especially in electronic devices and flexible integrated circuit boards. Compared with traditional polyimides, black polyimides used in integrated circuit carrier boards not only retain their inherent mechanical and thermal stability but also exhibit enriched functionality, including exceptional light-shielding capability, oxidation resistance, and effective protection of circuit designs against reverse engineering. These characteristics make it an ideal candidate substrate material for organic electronic devices. Although extensive research has been conducted on the preparation and application of black polyimides, a comprehensive and systematic review integrating multidimensional progress is still notably lacking, which hinders an in-depth understanding among researchers in this field. Furthermore, the strategy of molecular engineering via chemical structure modification to enhance polymer performance has been widely adopted, particularly in designing and preparing novel polymeric materials. Based on this, the present review focuses on the molecular design of black polyimides, systematically discussing their design strategies and research advancements by integrating chromogenic principles and preparation techniques. Finally, this review explores and summarizes the current challenges in the preparation and application of black polyimides, as well as future development directions.关键词：Black polyimide;Charge-transfer complex;Coloration mechanism;Molecular structure design;Flexible integrated circuit boards205|459|0更新时间：2026-02-01
- 摘要：Polydopamine is a typical melanin-derived artificial molecule. It has numerous excellent properties such as high adhesion, good biocompatibility, easy modification, and high photothermal activity, and thus has wide applications in the fields of energy catalysis, surface chemistry, and biomedicine. Metal-polydopamine composite nanomaterials are fabricated based on the strong binding affinity of polydopamine for various metal ions. They make full use of the excellent biological effects of polydopamine, benefiting from the unique physical and chemical characteristics of different metals, possess multiple biological functions including anti-tumor, antibacterial, anti-inflammatory, antioxidant, immune activation, and cell regeneration promotion. These materials show promising application prospects in areas such as integrated tumor diagnosis and treatment, wound healing, and tissue repair and regeneration. This review focuses on five major types of metal-polydopamine composites, which contain unique biological advantages originated from different metals. This paper also reviews the design and synthesis, physical and chemical properties of metal-polydopamine composites, as well as their typical applications in the biomedical field in recent years. It also summarized the challenges and opportunities that these materials face in future clinical translation and industrial production. Through the detailed summary in this review, it is expected to inspire the design of more novel metal-polydopamine composites, promote the explore of the application potential of novel polydopamine based biomedical materials, and promote the further integration of polyphenol chemistry and biomedicine.关键词：Polydopamine;Metal-polydopamine composites;Biomedical materials;Materiobiological effects;Polyphenol chemistry458|2401|0更新时间：2026-02-01
Review
- 摘要：The rapid advancement of flexible electronics has created an urgent demand for novel materials that exhibit metal-level electrical conductivity coupled with exceptional toughness. High electrical conductivity is the basis for the functioning of devices, while high toughness is key to adapting to the actual application environment and ensuring stable operation under complex working conditions. However, existing material systems still fail to meet these requirements simultaneously. A gel is defined as a semi-solid material consisting of a fluid fixed within a three-dimensional network; the original fluid is typically water, an organic liquid, or an ionic liquid. In this study, a novel gel material termed "metalgel" was designed via a fluid replacement strategy, which features a continuous liquid metal fluid phase stably immobilised within a three-dimensional porous polyurethane polymer network through hydrogen bonding interactions. This unique structure configuration endowed the polyurethane metalgel with metal-level electrical conductivity and ultra-high fracture toughness, while exhibiting excellent resistance to puncture and pressure stability. In addition, the material could be efficiently recycled through the process of solvent treatment, with the retention rate of mechanical and electrical properties being more than 80% after five recycling cycles. This study not only showed the potential to overcome the performance limitations of traditional material systems but also provided a novel paradigm for the design of high-performance flexible electronic materials.关键词：Flexible conductive materials;Polyurethane;Gel;Electrical conductivity;Toughness366|155|0更新时间：2026-02-01
- 摘要：Elastic polyurethane plates (EPPs) serve as the sole source of elastic cushioning for the ballastless track structure of high-speed railways, playing a crucial role in ensuring the safety and comfort of high-speed railway cars. This study investigated the microstructural changes in EPPs before and after exposure to thermal cycling between high and low temperatures, humidity-heat aging, and high-temperature aging, as well as the microstructural evolution under uniaxial tensile deformation. Multiple analytical techniques were employed, including differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and in situ synchrotron radiation wide angle X-ray diffraction/small angle X-ray scattering (WAXD/SAXS). The samples subjected to thermal cycling between high and low temperatures exhibited little change. Humidity-heat aging had the most significant impact, causing the average cellular diameter to decrease, cellular density to increase, and cracks to appear in the cell walls. The extent of microphase separation was improved remarkably after humidity-heat aging. The glass transition temperature of the hard segment also increased. The restriction effect of the hard segments on the poly(tetramethylene oxide) (PTMO) soft segments was weakened, resulting in a certain degree of crystallization of the PTMO soft segments after aging. This could increase the stiffness and decrease the elasticity. After both humidity-heat aging and high-temperature aging, the PTMO soft segments underwent strain-induced crystallization under large strains, which enhanced the tensile and tear strengths of the materials.关键词：High-speed railway;Elastic polyurethane plate;Polymer aging;Microphase separation;Strain-induced crystallization151|160|0更新时间：2026-02-01
- 摘要：Dynamic imine bonds with various bond dissociation energies (BDE) were incorporated into polyurethane (PU) networks to establish a correlation between imine BDE and self-healing performance, thereby tailoring the optimum self-healing temperature of PUs. In the study, five imine-contained trihydroxy compounds with BDE ranging from 553.1 kJ/mol to 596.5 kJ/mol were first synthesized via aldimine condensation, the trihydroxy compounds were then used as crosslinker to react with poly(ethylene glycol)-based PU prepolymers, followed by solvent evaporation to yield a series of self-healing PU films. 1H-/13C-NMR and FTIR techniques were adopted to confirm the chemical structures of the crosslinkers and PUs. The self-healing capacity of the PU films was evaluated by tensile testing of pristine and self-healed films at different healing temperature, and the results revealed that the optimum healing temperature increased gradually with the increment of imine BDE. PUs with low imine BDE (553.1 kJ/mol) exhibited maximum self-healing efficiency (ηm) of 86.3 % at 40 ℃; those with medium imine BDE (565.9 kJ/mol) required 50 ℃ to achieve ηm of 82.7%; whereas the ηm of PU films containing high imine BDE (596.5 kJ/mol) was 78.8% at healing temperature of 60 ℃. These findings preliminarily demonstrated that imine BDE could serve as a simple molecular switch for programming the optimal healing temperature of self-healable PUs, providing a design principle for next-generation self-healing materials.关键词：Dynamic imine bonds;Bond dissociation energy;Self-healing;Polyurethane119|101|0更新时间：2026-02-01
- 摘要：Linear conjugated polymers (LCPs) have been widely applied in the field of photocatalytic hydrogen evolution, yet their application in photocatalytic water oxidation half-reactions (oxygen evolution reaction, OER) remains challenging due to sluggish OER kinetics and insufficient thermodynamic driving force. Inspired by the enhanced photocatalytic hydrogen evolution performance in ternary conjugated polymers achieved through molecular engineering, this work proposed a dual-donor conjugation engineering strategy. By introducing a π-bridge, D-π-D-A type ternary LCPs were anticipated to be constructed with synergistically regulating the band structure and redox potentials, thereby promoting hole enrichment and effectively enhancing the separation efficiency of photogenerated electron-hole pairs (e⁻-h⁺). Employing direct C―H arylation polycondensation reaction, we precisely synthesized two D-π-D-A type ternary linear copolymers, CP-1 and CP-2. which comprise a strong donor unit (bithiophene or terthiophene), a π-bridge (1,4-dibromo-2,5-difluorobenzene), and a hydrophilic acceptor unit (dibenzothiophene sulfone, 3,7-dibenzothiophene-5,5-dioxide). Experimental results showed that both CP-1 and CP-2 exhibited bifunctional photocatalytic water-splitting activity for H2 and O2 production. Notably, CP-2, featuring the terthiophene donor unit, demonstrated superior OER activity, achieving an oxygen evolution rate of 4.7 mmol·g⁻1·h⁻1, which was 2.9 times higher than that of CP-1 (1.6 mmol·g⁻1·h⁻1, bithiophene donor). Importantly, CP-2 still maintained competitive photocatalytic hydrogen evolution performance (25.1 mmol·g⁻1·h⁻1) alongside its high OER performance. This work demonstrated efficient bifunctional water splitting (H2 and O2 evolution) in D-π-D-A polymers via synergistic dual-donor conjugation engineering, providing a novel design strategy for high-performance LCP photocatalysts.关键词：Photocatalytic hydrogen evolution;Photocatalytic oxygen evolution;Bifunctional LCP-based photocatalyst;Dual-donor;D-π-D-A type conjugated polymers286|562|0更新时间：2026-02-01
- 摘要：Poly(butylene aidpate-co-terephthalate) (PBAT) is an important biodegradable polymer for agricultural mulch film application, but its water vapor barrier property is still poor for application in arid and extremely arid regions. In this study, PBAT was blended with polylactide (PLA) and docosanoic acid (DA) in the absence and presence of a compatibilizer ADR, the effects of DA dosage and the presence of PLA and ADR on the water vapor barrier property, microphase morphology, thermal transition and stability, and tensile properties of the resulting blends and films were studied. It could be found that the DA could form hydrophobic crystal plates in the interior and hydrophobic crude morphology on the surface of the films, and therefore greatly improved the water vapor barrier property. The presence of rigid PLA significantly improved the tensile modulus and strength of the blends, while maintaining excellent ductility of PBAT, avoiding the strength reduction occurred in the PBAT/DA binary blend. The introduction of a small amount of ADR improved the compatibility among the various components, and further enhanced the water vapor barrier property and mechanical performance. The PBAT/PLA/DA/ADR film containing 8 wt% DA (DA8*) possessed WVP barrier property 11 times the level of PBAT and improved tensile properties. This work presents a simple and practical way to prepare fully biodegradable polymer films with highly improved water barrier properties and excellent mechanical properties.关键词：Biodegradable polymers;Poly(butylene adipate-co-terephthalate);Poly(lactic acid);Long-chain saturated fatty acids;Water vapor barrier properties223|254|0更新时间：2026-02-01
- 摘要：A long-chain-branched polypropylene (LCB-PP)/cycloolefin copolymer (COC) blend was designed and synthesized, offering a novel approach for developing high-temperature-resistant polypropylene capacitor films. Initially, COC resins with high glass transition temperature were synthesized using a preferred Ph2C(Cp)(Flu)ZrCl2/C(C6H5)3)(B(C6F5)4) metallocene catalyst system by precisely adjusting the norbornene-to-ethylene ratio. Subsequently, the resulting COC was melt-blended in specific proportions with LCB-PP (synthesized via ω-alkenylmethyldichlorosilane copolymerization-hydrolysis (ACH) chemistry), and commercial biaxially oriented polypropylene (BOPP), respectively, thereby yielding a series of linear-PP/COC and LCB-PP/COC blend samples. The structure and properties of these blends were systematically characterized. The results demonstrated that the PP/COC blends exhibited elevated crystallization temperatures and enhanced heat deflection temperature, which are advantageous for their application in high-temperature environments. Meanwhile, the LCB structures, acting as nucleation sites, could promote heterogeneous nucleation, refined the spherulite size of the PP phase, and thereby increased the spherulite density. In addition, the enhancement of chain entanglement by the LCB structures effectively restricted the sliding of chains, concurrently suppressed the grain coarsening tendency of dispersed COC particles during melt processing, promoted their dispersion uniformity, and thereby significantly improved the processing stability of the PP/COC blends.关键词：Long-chain-branched polypropylene;Cycloolefin copolymer;PP/COC blend;High-temperature resistance performance225|322|0更新时间：2026-02-01
- 摘要：To address the pressing demand for sustainable polymeric materials, the development of novel polymer systems combining high performance with controllable degradation characteristics has become a significant challenge in polymer science. Poly-2,3-dihydrofuran (PDHF), a degradable vinyl polymer synthesized via cationic polymerization, exhibits excellent service performance at high molecular weights. However, the synthesis of high-molecular-weight PDHF remains challenging due to inherent limitations in conventional cationic polymerization methods. Herein, we report a controlled cationic polymerization of DHF mediated by anion-binding catalysis. Through meticulous screening of anion-binding catalysts and cationic initiators, PDHF with molecular weight of 427 kg/mol was successfully synthesized for the first time. The resultant PDHF demonstrated outstanding thermomechanical properties, barrier performance, optical transparency, and adhesive characteristics. Furthermore, we explored the stereoselective polymerization of DHF under anion-binding catalytic conditions, achieving the synthesis of 67% cis-isomer-enriched PDHF with an elevated glass transition temperature (Tg) of 168 ℃, which was markedly higher than trans-isomer-enriched PDHF.关键词：Poly-2,3-dihydrofuran;Anion-binding catalysis;High-molecular-weight335|347|0更新时间：2026-02-01
- 摘要：Dynamic covalent polymer networks (DCPNs) offer a promising solution to the recyclability challenges of thermosets. However, due to the reversible nature of the dynamic bonds, these materials typically exhibit poor elevated-temperature creep resistance. Deficiencies in thermal and mechanical properties, as well as dimensional stability, limit their practical applications. Herein, we report the synthesis of high-performance biobased dynamic covalent cross-linked polymers (PBVs) using vanillin and L-lysine diisocyanate as monomers, with diethylenetriamine and 4,4'-diaminodiphenylamine as crosslinkers. Structural analysis confirmed that the aldehyde-amine condensation reaction successfully formed a hybrid aminal/imine DCPN. The material demonstrated excellent elevated-temperature creep resistance, with a tensile strength of approximately 70 MPa and a Tg exceeding 120 ℃. Notably, the initial creep temperature of resin reached up to 120 ℃. Furthermore, the PBVs undergo complete degradation under acidic conditions and could be reprocessed via hot-pressing. This work presents a new strategy for developing biobased thermosets that simultaneously possess elevated-temperature creep resistance and recyclability, demonstrating significant potential for sustainable materials.关键词：Thermosetting resin;Dynamic covalent polymer network;Bio-based;Creep resistance;Degradation343|520|0更新时间：2026-02-01
- 摘要：With the widespread application of high-energy gamma rays in modern healthcare, industrial inspection, aerospace and other fields, coupled with the global development of clean nuclear energy, the demand for wearable radiation shielding materials with enhanced safety, durability, and comfort has significantly increased. However, current polymer-based flexible radiation shielding materials often face a dilemma: the incorporation of high loadings of shielding particles to improve protection effectiveness typically leads to a decline in material flexibility and mechanical strength, which is still a challenge of obtaining simultaneously both high shielding performance and excellent mechanical properties nowadays. This study addressed this issue by employing the functionalized eco-friendly shielding filler bismuth trioxide to fill biocompatible natural rubber (NR). Through this strategy of designing a crosslinking network by the co-polysulfide compound and constructing the strong hydrogen-bonding interfacial interactions, the excellent dispersion of the high-content shielding particles within the NR matrix was achieved and the novel, green, and flexible vulcanized composite film for gamma-ray shielding was prepared. The results demonstrated that this strategy employed can significantly enhance the uniform and stable dispersion of shielding fillers within the NR matrix. A new and effective way for preparation of a green, flexible, high-energy radiation shielding composite film material with low density, high strength, and excellent puncture resistance was provided.关键词：Green and flexible;Natural rubber;Bismuth oxide;Interfacial interaction;High-energy ray shielding302|213|0更新时间：2026-02-01
- 摘要：Bacterial infections pose a persistent threat to human health, and the overuse of antibiotics has led to the emergence of multidrug-resistant bacteria, severely jeopardizing global public health security. Therefore, there is an urgent need to develop novel, reliable antimicrobial functional materials. Piezoelectric materials with electromechanical conversion capabilities have garnered increasing attention due to their unique antimicrobial mechanisms. In this study, poly(3-hydroxybutyrate) films loaded with piezoelectric ceramic barium titanate nanoparticles were prepared using electrospinning technology. The barium titanate provided a stable piezoelectric signal for the electrospun membrane; The electrospun membrane was then used as a scaffold, and hydrogel films was formed through photoinitiated polymerization of methacrylic acid-modified double-bonded chitosan on the surface and interior. The study demonstrated that the prepared piezoelectric hydrogel films exhibit excellent piezoelectric properties, mechanical properties, adhesive properties, good thermal stability, swelling properties, degradability, and biocompatibility, as well as significant antibacterial effects against Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus). In summary, this study developed an effective piezoelectric antibacterial hydrogel film, providing new insights for the treatment of wound infections and infectious bone defects.关键词：Antibacterial;Piezoelectric;Hydrogel;Electrospinning;Chitosan225|552|0更新时间：2026-02-01
- 摘要：Kappa carrageenan (KC), a linear sulfated polysaccharide, has a broad application prospect in the field of trauma dressing and drug controlled release due to its excellent gelation, biocompatibility and solubility. In order to solve the problems of long healing time, high risk of infection, and poor patient compliance during the treatment of infected wounds with traditional dressings, this study employed methacrylic anhydride derivatised KC (MAKC) as a macromolecular cross-linking agent, N-hydroxyethyl acrylamide (HEAA) as a copolymerising monomer, and cinnamaldehyde-hydroxyethyl-β-cyclodextrin inclusion compound as an antimicrobial agent, and developed a novel KC composite gel microneedle dressing, and the mechanical properties, in vitro release, antibacterial properties and therapeutic effects of KC composite gel microneedles were evaluated. The results of nuclear magnetic resonance (NMR) and elemental analysis showed that the grafting rate of methacrylic anhydride in MAKC was 32.02%. Mechanical property tests showed that the compressive strength of the resulting KC composite gel microneedles ranged from (0.07±0.02) N/needle to (0.25±0.02) N/needle, which could meet the skin penetration requirements. Quantitative analysis showed that the maximum drug loading rate of cinnamaldehyde in the inclusion complex could reach (6.69±0.31)%; and the release of hydroxyethyl-β-cyclodextrin from the KC composite gel microneedles followed the Higuchi model equation for a skeletal diffusion mechanism. Antibacterial experiments showed that the inhibition rates of KC composite gel microneedles against Staphylococcus epidermidis and Escherichia coli were (90.29±3.10)% and (93.16±2.42)%, respectively. In vitro cellular and haemolysis experiments confirmed that KC composite gel microneedles had good cellular and haematological compatibility. SD rats infected wound model showed that the antibacterial effect of KC composite gel microneedles was comparable to that of the model drug, mupirocin, and the wound healing rate reached (89.42±0.88)% on the 11th day. HE and Masson staining showed that it could significantly promote the proliferation of epithelium and the orderly deposition of collagen. In conclusion, KC composite gel microneedle has good antibacterial, biocompatibility and pro-repair functions, which provides a new solution for the treatment of infected wounds and has a broad clinical application prospect.关键词：Kappa carrageenan;Cinnamaldehyde;Microneedle;Infected wound;Medical dressing223|531|0更新时间：2026-02-01
- 摘要：Ion exchange membranes (IEMs) are essential components in various electrochemical systems. Ion selectivity and ion flux are the two key parameters for evaluating IEM performance, and achieving both high selectivity and high flux has long been a major challenge in both academic and industrial communities. In conventional IEMs, ionic groups assemble into a three-dimensional ion transport network. However, at low ionic group content, the formation of continuous ion channels is limited, resulting in low ion flux. Increasing the ionic group content can enhance ion flux but often leads to excessive swelling, thereby compromising selectivity. Constructing high-density ion transport channels with a minimal number of ionic groups remains a significant difficulty. To address this issue, we proposed a strategy to fabricate high-density ion channels by using tiny amounts of ionic groups. 4-Aminoazobenzene (Azo) was grafted onto a styrene-ethylene/butylene-styrene (SEBS) block copolymer containing a small amount of maleic anhydride (MA). During the grafting reaction, carboxylic acid groups were introduced in situ. Although the Azo units are grafted onto the ethylene/butylene segment, their stronger compatibility with the polystyrene (PS) domains drives their migration toward the PS regions during self-assembly. This process induces the interfacial enrichment of carboxyl groups, resulting in the formation of a high-density ion channel array. This "less-to-more" design concept differs from conventional material strategies and enables a synergistic enhancement of both ion flux and selectivity. The resulting membrane exhibited excellent osmotic energy conversion performance, achieving a power density of 9.35 W/m2 under a 500-fold salinity gradient, offering a novel pathway for the development of next-generation high-performance IEMs.关键词：Ion exchange membrane;Block copolymer;Micro-phase separation;Salt gradient energy conversion299|150|0更新时间：2026-02-01
- 摘要：A novel thread-type core-shell polypyrrole@polyurethane (PPy@PU) fiber was fabricated via in situ polymerization of PPy on pre-stretched PU fiber, and applied as a durable, flexible, stretchable, conductive strain sensor for the first time. Benefiting from the highly ordered continuous stretchable structure, thread-type core-shell structure can effectively buffer the dramatic deformation and maintain the structure integrity of PPy@PU fiber, resulting in stable conductivity during the stretching/releasing cycles. The variations in morphology and chemical structures, stretchability, and conductivity as well as the sensitivity of resistance change under stretching cycles were investigated. The optimized PPy@PU fiber presents advantages of large detecting strain up to 200%, high gauge factor of about 12.4 at 200%, and can detect changes as fast as 500 mm/min, long durability of 200 cycling times. Furthermore, the advantages of thread PPy@PU fiber were then used to construct a prototype of wearable sensor to detect finger's bending and elbow's extension which exhibited its great potential applications as wearable devices and smart fabrics.关键词：Strain sensor;Stretchable conductive fiber;Polypyrrole;Pre-stretched;Human motion detection390|374|0更新时间：2026-02-01
- 摘要：Cellulose nanocrystals (CNC) are commonly used as reinforcing fillers for composites due to their excellent mechanical properties and other advantages, and the mechanical enhancement of composites is often closely related to the dispersion of the nanoreinforcing fillers as well as the interfacial compatibility. In this study, castor oil and polylactic acid chains were covalently grafted on the surface of CNC, respectively, to enhance its compatibility with polyester matrix and prepare mechanically enhanced composites. The surface grafting rate of CNC-g-CO was calculated to be 205.30 mg/gCNC with a surface substitution of 12.60%, while the surface grafting rate of CNC-g-PLA was 431.90 mg/gCNC with a surface substitution of 9.14%. The compatibility of the composite systems was predicted by the Hansen solubility parameters, and the dispersion of CNC in the matrix was further evaluated visually using micro-infrared imaging. The results showed that the surface modification of CNC significantly improved the compatibility and dispersion between it and the matrix. The thermodynamic properties of the composites further demonstrated the interfacial capacitation and mechanical enhancement effects in the systems.关键词：Cellulose nanocrystals;Composites;Microinfrared imaging;Dispersion compatibility;Mechanical enhancement359|483|0更新时间：2026-02-01
- 摘要：Polyether block polyamide elastomer (PEBA) was blended with polyether thermoplastic polyurethane elastomer (TTPU) and polyester thermoplastic polyurethane elastomer (STPU), respectively, by melt processing method to prepare two blends, namely PEBA/TTPU (PTT) and PEBA/STPU (PST). Ethylene-1-octene copolymer grafted maleic anhydride (POE-g-MAH) was added to improve the compatibility between thermoplastic polyurethane elastomer (TPU) and PEBA. The changes in mechanical properties, crystallization properties, rheological properties, etc., of the two blends before and after compatibilization, as well as the compatibilization mechanism, were analyzed, and the influence of different types of TPU on the properties of TPU/PEBA blends was explored. The results showed that when the ratio of PEBA/TPU was 20/80, the mechanical properties of both blends were the best. After adding 5 parts of POE-g-MAH, the tensile strength of PTT and PST increased by 37.5% and 22.5%, respectively, and the elongation at break increased by 15.3% and 13.3%, respectively. Scanning electron microscopy (SEM) showed that the compatibilizer reduced the size of the PEBA dispersed phase and improves the interfacial compatibility. However, TTPU and STPU showed different dispersion behaviors due to the difference in the polarity of the soft segments: TTPU and PEBA formed strong hydrogen bonds through polarity matching, while the ester groups of STPU only formed hydrogen bonds with the maleic anhydride groups of POE-g-MAH, resulting in the physical micro-crosslinking degree and melt elasticity of PST being lower than those of PTT. Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC) and rheological tests further confirmed that PTT had higher complex viscosity and storage modulus due to strong interfacial interaction. The STPU-based blend had lower viscosity in the low-frequency region due to the high degree of phase separation, and excessive compatibilizer would aggravate phase separation. This study clarifies the influence law of TPU soft segment polarity on the interfacial interaction, crystallization behavior and rheological properties of the blends, and provides a theoretical basis for the low-cost modification of PEBA-based elastomers and their applications in fields such as shoe materials and medical equipment.关键词：Thermoplastic polyurethane elastomers;Polyether block amide elastomers;Blends;Compatibility;Rheological properties364|545|0更新时间：2026-02-01
- 摘要：Currently, rubber composites are primarily reinforced by adding traditional fillers, but excessive filler content makes it difficult to balance both strength and elongation simultaneously. In this study, a novel filler-free reinforced rubber composite system was developed using a synergistic strategy of bioinspired hydrogen bond networks and covalent bonds. First, based on the ring-opening reaction between amino and epoxy groups, epoxidized natural rubber (ENR) with an octuple hydrogen bond structure was designed and prepared. It was then blended with non-polar rubber (solution-polymerized styrene-butadiene rubber, SSBR), using sulfur bonds as bridges to connect the molecular chains of the two rubbers, forming a three-dimensional interpenetrating network structure. In this system, covalent bonds ensure the structural integrity and rigid support of the rubber composite, while the octuple hydrogen bonds act as sacrificial bonds. Through their reversible break-recombination behavior, they effectively enhance the mechanical properties and elongation of the rubber composite, while also imparting a certain degree of self-recovery capability. Experimental results showed that with only a small amount of the octuple hydrogen bond structure added, the tensile strength of the rubber composite increased from 2.1 MPa to 4.88 MPa, the elongation at break improved from 240% to 500%, and the fracture toughness rose from 3.2 MJ/m3 to 12.4 MJ/m3. The wear resistance and fatigue resistance were also significantly enhanced. The density of the octuple hydrogen bonds could be controllably adjusted according to practical application requirements. Notably, this technology employed conventional mixing and vulcanization processes, making it compatible with existing rubber industry production lines. The all-organic component design avoided the processing fluidity degradation issues caused by traditional fillers. This study provides new theoretical guidance and technical pathways for developing environmentally friendly high-performance rubber materials, holding significant importance for promoting the green upgrade of the rubber industry.关键词：Rubber composites;Octuple hydrogen bonds;Interpenetrating network;Mechanical properties230|345|0更新时间：2026-02-01
- 摘要：As a new type of bio-based monomer, isosorbide has been widely used in polymer synthesis. However, its reaction activity is low, which makes it difficult to produce high molecular weight polymer. Therefore, studying its reaction kinetics and developing a kinetic model are essential to understand the reaction mechanism and enhance synthesis techniques. In this study, isosorbide (IS), isomannide (IM), and succinic acid (SA) were used as monomers to prepare poly(isohexides succinate) by esterification and polycondensation melt reaction, and the kinetic models were established. The results showed that, due to hydrogen bonding, both the esterification rate and the molecular weight of the IS/SA system were lower than those of the IM/SA system. The activation energies for esterification and polycondensation of the IS/SA system were 93.6 and 50.09 kJ·mol-1, respectively. For the IM/SA system, the activation energies for esterification and polycondensation were 51.5 and 64.75 kJ·mol-1, respectively.关键词：Isosorbide;Isomannide;Esterification kinetics;Polycondensation kinetics;Chromaticity311|245|0更新时间：2026-02-01
- 摘要：Traditional polypropylene toughening typically employs elastomeric toughening agents, which often compromises the synergistic optimization of strength, toughness, and electrical properties. To address this issue, this study adopted a non-additive strategy involving the melt blending of polypropylene random copolymer (PPR), isotactic polypropylene (iPP), and a β-nucleating agent. This approach leveraged the synergistic effect of iPP and the nucleating agent to induce the formation of a highly β-crystalline phase (achieving 42% β-crystal content). Subsequent isothermal post-treatment further increased the β-crystal content to 48% and established a multiple boundary structure. This multigrain boundary structure optimized material performance by suppressing the initiation of both mechanical and electrical cracks while enhancing interfacial polarization. Consequently, the material maintained its strength while achieving a toughness of 33.6 kJ/m2, a breakdown strength of 455 kV/mm, and increased dielectric constant of 2.11, thereby achieving a balanced optimization of strength, toughness, and electrical properties. Furthermore, compared to conventional rubber-toughened systems, this material exhibited superior mechanical damage resistance, retaining a breakdown strength exceeding 300 kV/mm after repeated mechanical damage. This work provides novel insights for designing and fabricating materials that simultaneously possess high electrical and mechanical performance.关键词：Polypropylene;β-Crystallization;Mechanical properties;Electrical properties210|233|0更新时间：2026-02-01
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