最新刊期
卷 56 ， 期 8 ， 2025
- 摘要：The preparation of ethylene-based block copolymers (OBCs) using a single catalyst represents a significant scientific challenge. During the catalytic copolymerization of ethylene and α-olefins, the catalyst must simultaneously exhibit both high and low α-olefin selectivity—an inherently conflicting requirement. Wang, Liu, and coworkers have addressed this problem through the rational design of a catalytic system. By introducing the concept of dynamic ligand modulation, they successfully realized the synthesis of OBCs using a single catalyst without the need for chain transfer agents. This approach establishes a novel synthetic paradigm for OBCs, offering the potential to transform current industrial production processes and providing valuable insights for the design and synthesis of other high-performance polymeric materials.关键词：Catalyst;Copolymerization;Polyolefin;Olefin block copolymers;Elastomer123|56|0更新时间：2025-07-28
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- 摘要：With the development of modern industry, water pollutions caused by heavy metal ions, organic dyes and oil pollutants have become more and more severe, which constituted a serious threaten to ecological environment and human health. Polymer microspheres are widely used in the field of water treatment due to their high specific surface area, good adsorption properties and easy functionalization. It is of great scientific value and practical significance to develop a facile, efficient and environmentally friendly polymerization method for the preparation of polymer microspheres with high density functional groups. In recent years, our research group has developed a novel green heterogeneous polymerization technique named "Self-Stabilized Precipitation Polymerization" (2SP polymerization), which allows for the simple and efficient design and preparation of polymer microspheres with various topological structures, including core-shell, hollow, and porous structures. Benefiting from both high density of functional groups and abundant multilevel porous structure, these microspheres have been widely applied in water treatment. In this feature article, the design and preparation of microspheres with tunable composition and topological structure by 2SP process were discussed in detail. Furthermore, the reactive groups on the surface of the polymer microspheres can be facilely chemically modified, and these modified microspheres can be applied in water treatment fields, such as adsorption/separation of dyes, antibiotics and heavy metal ions, preparation of supported catalysts and membrane separation (for oily wastewater).关键词：self-stabilized precipitation polymerization;Polymer microspheres;Adsorption;Water treatment361|541|0更新时间：2025-07-28
Feature Article
- 摘要：Among chiral resolution methods, crystallization resolution is still a frequency used methods for obtaining enantiomerically pure chiral drugs or their intermediates in pharmaceutical industry owing to its simple operation and low cost. The reverse crystallization with the assistance of "tailor-made" additives is suitable for a wide range of substrates, shows high resolution efficiency, and has broad application prospects. Recent research advancements in the field of crystallization resolution using polymeroc additives have been comprehensively reviewed in this article. It includes homopolymers, copolymers, polysaccharide derivatives, polymer assemblies, and polymer/nanoparticle hybrids. In addition, the structure-activity relationship and efficient recovery strategy of the polymeric additives are discussed, and the future development of polymeric additives is proposed.关键词：chiral resolution;"Tailor-made" stereoselective additive;Polymer;chiral drug;polysaccharide derivative188|81|0更新时间：2025-07-28
- 摘要：Compared to small molecule drugs, protein drugs exhibit high specificity and low toxicity, making them pivotal in the treatment of numerous serious diseases. Nevertheless, they confront several challenges in clinical application, including instability, high immunogenicity, and susceptibility to rapid degradation and elimination, ultimately resulting in low bioavailability. To overcome these problems, various protein drug delivery systems have been devised. Notably, delivery systems utilizing dynamic covalent bonds not only increase the stability of protein drugs during the delivery process but also facilitate stimulus-responsive drug release at the target site, thereby significantly enhancing the bioavailability and therapeutic efficacy of protein drugs. This review briefly introduces protein drug delivery systems based on covalent bonds, non-covalent interactions, and dynamic covalent bonds. The construction methodologies, drug release mechanisms, and the latest advancements in the application of protein drug delivery systems based on dynamic covalent bonds are then summerized. The aim is to provide insights and guidance for the development of more efficient and practical protein drug delivery systems.关键词：Protein drugs;Dynamic covalent bonds;Drug delivery;Stimulus-responsive release;Nanocarriers218|178|0更新时间：2025-07-28
- 摘要：Proteins are essential for the construction of living organisms, regulation of physiological functions, and energy supply for life activities. With the introduction of proteomics technology and the rapid development of biotechnology, the demand for efficient protein separation is increasing. The development of effective protein separation techniques is essential to advance proteomics research and biotechnology applications. This review aims to summarize recent advances in the field of protein separation using polymeric materials, focusing on the design, function and application potential of these materials. The review begins with a classification of polymers according to their interaction mechanism with proteins, which includes size sieving, hydrophobic interactions and electrostatic interactions. These interactions can be used for selective protein capture and purification. Neutral polymers are firstly introduced and classified into hydrophilic and hydrophobic polymers, which separate proteins via size sieving and hydrophobic interactions, and are known for their abilities in constructing stable three-dimensional network structures, reducing non-specific adsorption and maintaining protein activity. The second focus is placed on the separation of positively and negatively charged proteins by electrostatic attraction or repulsion, and the introduction of abundant charged functional groups on polymeric materials can provide active sites for protein binding. Tunable charge systems are also discussed, with a focus on composites that can be switched between cationic, neutral and anionic states. Weak polyelectrolytes that undergo reversible protonation and deprotonation are commonly used in the tunable system as their charge state changes in response to changes in pH or other environmental factors. This property facilitates the control of protein adsorption and desorption processes. The application of stimuli-responsive polymers with changeable physical or chemical properties in response to external stimuli such as temperature, pH, light, or electric fields, in improving protein capture efficiency and selectivity is also reviewed. Finally, this review predicts future trends in protein separation technology, envisioning more efficient, precise, and intelligent systems capable of achieving higher purity and yield of protein separation. The development of cost-effective, scalable methods to meet the stringent requirements of personalized therapies and industrial biopharmaceutical production remains a challenge. The combination of information technology and traditional experimental science will pave the way for next-generation protein separation tools that address these challenges, making a significant contribution to the advancement of life sciences and healthcare.关键词：Polymer materials;protein separation;size screening;Electrostatic interaction241|384|0更新时间：2025-07-28
Review
- 摘要：Traditional chemotherapeutic drugs lack targeting ability and often cause damage to normal tissues during treatment. With advancements in tumor research, the development of intelligent drug delivery systems has made remarkable progress. Peptides are widely used in the fields of drug delivery and bioimaging because of their unique biological activity, favorable biocompatibility, ease of synthesis, modification, and functionalization. In this study, a peptide nanomedicine (RGDGPN@DOX) was rationally designed to achieve precise tumor-targeted drug delivery, amplify immune activation, and enhance therapeutic efficacy. Among them, the RGD peptide could specifically target overexpressed integrins in tumor cells and enhance the enrichment and uptake of nanomedicines in tumor cells. Furthermore, the response characteristic of the PLGLA segment was matrix metalloproteinase 2 (MMP2), which selectively released the chemotherapeutic drug doxorubicin (DOX) in the tumor microenvironment. Simultaneously, the incorporation of the NFMLP peptide endowed the nanomedicine with immune-regulatory capabilities, promoting the recruitment and activation of macrophages and further enhancing the antitumor effect. The results of the cell experiments demonstrated that RGDGPN@DOX peptide nanodrugs could accurately target tumor cells and effectively kill tumor cells. It also induces an immune response, promotes macrophage chemotaxis, and enhances antitumor immune effects. The designed RGDGPN@DOX peptide nanodrugs integrate multiple functions, including targeting, enzyme-responsive release, chemotherapy, and immunomodulation, showing promising application potential in the fields of drug-targeted delivery and immunotherapy.关键词：Peptide nanomedicine;Tumor-targeting;Immunogenic cell death;anti-tumor therapy265|107|0更新时间：2025-07-28
- 摘要：Using biomass-derived caffeic acid (CA) as the raw material, two bio-based caffeic acid derivatives were synthesized via a one-pot decarboxylation and phenolic hydroxyl protection strategy. These derivatives were then copolymerized with styrene through free radical bulk polymerization to develop a series of bio-based polystyrene alternatives. This study systematically investigated the mechanism of free radical copolymerization between the two monomers and styrene, while employing Materials Studio simulations to analyze the effects of substituent group types and composition ratios on the copolymers' microstructure and macroscopic properties. The developed bio-based polystyrene materials exhibited distinct performance characteristics: (1) high-strength copolymer: The copolymer synthesized with Ac2VC monomer achieved a tensile strength of 76.5 MPa and an elongation at break of 10.1%, representing 35.4% and 102% improvements, respectively, over conventional polystyrene; (2) high-ductility copolymer: The copolymer derived from TBS2VC monomer demonstrated a tensile strength of 37.2 MPa and a remarkable elongation at break of 39.5%, with a yield point observed in its stress-strain curve. This corresponds to a 690% enhancement in elongation compared to traditional polystyrene. Key findings highlight that the intrinsic catechol functional groups in caffeic acid derivatives play a pivotal role in material performance. By strategically designing protective groups (e.g., acetyl or tert-butyldimethylsilyl), the properties of the copolymers can be precisely tailored to expand their applications. Moreover, this approach enables the introduction of specific functionalities (e.g., enhanced thermal stability, tunable mechanical behavior) for creating high-performance polymeric materials. This work demonstrates a sustainable pathway to replace petroleum-based polystyrene with bio-based alternatives, offering both performance superiority (e.g., adjustable glass transition temperature, balanced strength-ductility) and functional versatility through rational molecular design. The integration of experimental synthesis and computational modeling provides a robust framework for advancing bio-based polymers toward practical industrial applications.关键词：Bio-based polystyrene;caffeic acid;functionalized monomers;phenolic hydroxyl protection;free radical bulk polymerization101|70|0更新时间：2025-07-28
- 摘要：A novel diamine monomer containing a Tröger's base (TB) structure, 2,8-diamino-4,10-dimethyl-6,12-hydrogen-5,11 methylene dibenzo [1,5] diazo octane (TBDA), was designed and synthesized. This monomer was then copolymerized with 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) and 2,2′-bis(3-amino-4-hydroxyl-phenyl) hexafluoropropane (APAF) to synthesize a series of polyimides (HPI) containing ortho-hydroxyamide units. The HPI membranes underwent thermal rearrangement (TR) at high temperatures to yield poly(benzoxazole-co-imide) (PBO-PI) gas separation membranes by the thermal rearrangement containing the TB structure and the thermally rearranged benzoxazole units. The results demonstrated that the synergistic effect of the inherent microporosity of TB moieties and thermal rearrangement inhibited the dense packing of molecular chains, providing the membrane with a rich free volume, thus imparting excellent gas separation properties. The gas permeation coefficients of the 6FTB1-TR membrane containing 10 mol% of TBDA and thermally rearranged at 430 ℃ demonstrated excellent gas separation performance with CO2, CH4, O2, and N2 permeation coefficients of 267.6, 7.0, 57.2, and 12.5 Barrer, respectively, with the ideal selectivities of α(CO2/CH4) and α(O2/N2) being 38.2 and 4.6, respectively. Moreover, its thermal degradation temperature is over 530 ℃ and glass transition temperature (Tg) exceedes 400 ℃, demonstrating excellent thermal stability. This study provides new insights into the design and development of novel high-performance gas separation membranes.关键词：Tröger's base (TB) structure;thermal rearrangement;synergistic interaction;Gas separation membrane116|22|0更新时间：2025-07-28
- 摘要：Polyethylene terephthalate (PET) exhibits not only outstanding mechanical properties and chemical stability, but also benefits from industrial-scale availability, cost-effectiveness, and ease of recycling. PET has significant potential for the development of small-diameter vascular grafts as a key material for clinically used large-diameter artificial blood vessels. However, its limited solubility at room temperature has hindered its application in wet-spinning. To address this challenge, a binary solvent system comprising dichloromethane (DCM) and hexafluoroisopropanol (HFIP) was employed to achieve rapid dissolution of PET under mild conditions. The DCM-HFIP system markedly accelerated the dissolution process, reducing the required time from 24 h to 0.5 h at ambient temperature (25 ℃). Furthermore, the incorporation of DCM enhances the stability of the solvent system, while enabling precise control over the phase separation pathway. Spinodal phase separation was induced by modulating the DCM content, effectively suppressing the formation of finger-like pores and promoting a bicontinuous pore structure. This structural optimization reduces the average membrane pore size from 1.58 μm to 0.87 μm. Experimental results confirm that an optimal DCM volume fraction (10%-20%) significantly improves the membrane's mechanical strength and filtration efficiency, accompanied by a moderate reduction in surface roughness. This study provides a green and efficient strategy for fabricating high-performance PET hollow fiber membranes and establishes a theoretical foundation for their future biomedical applications, particularly in the development of small-diameter artificial vascular scaffolds. Notably, the proven biocompatibility of PET in large-diameter vascular grafts, combined with the biomimetic hollow lumen structure that closely resembles the natural human vasculature, positions this research as a pioneering pathway for advancing next-generation small-diameter artificial blood vessels.关键词：PET hollow fiber membrane;Dichloromethane-assisted dissolution;Phase separation control;Microporous structure;Spinodal decomposition113|92|0更新时间：2025-07-28
- 摘要：A series of bridged [OSSO]-type hafnium complexes (Hf-Bn, Hf-Me, and Hf-Cl) with different ancillary ligands were synthesized and characterized. After activation with [Ph3C][B(C6F5)4] or methylaluminoxane (MAO), three bridged [OSSO]-type hafnium complexes showed good catalytic activity for 4-methyl-1-pentene (4M1P) polymerization. When the boron compound [Ph3C][B(C6F5)4] was used as an activator, alkyl hafnium complexes Hf-Bn and Hf-Me showed excellent catalytic activity of 1.40×105 g PMP·(mol Hf)-1·h-1. However, the chloride hafnium complex Hf-Cl achieved comparable activity (1.35×105 g PMP·(mol Hf)-1·h-1) only when methylaluminoxane (MAO) was used instead of [Ph3C][B(C6F5)4]. The three catalytic systems exhibited very high stereochemical selectivity. In comparison, Hf-Bn and Hf-Me systems afforded poly(4-methyl-1-pentene) (PMP) with higher isotacticity ([mmmm]>98%) than Hf-Cl ([mmmm]=92%). Hf-Bn was chosen to further study influences of 4M1P/Hf molar ratio, temperature and Al(TIBA)/Hf ratio on 4M1P polymerization. The catalytic activity and PMP molecular weight increased with increasing 4M1P/Hf molar ratio. Hf-Bn reached its maximum activity at 50 ℃. The molecular weight of PMP gradually decreased with increasing Al(TIBA)/Hf ratio, strongly indicating that chain transfer to Al occurred. The PMP samples were fully characterized by gel permeation chromatography (GPC), 1H- and 13C-NMR, differential scanning calorimetry (DSC), and wide-angle X-ray diffraction (WAXD). GPC analysis showed that the weight-average molecular weight of the produced PMPs was about 1.0×104 g·mol-1. 1H-NMR analysis further proved that the obtained PMP was fully saturated, which strongly supports the hypothesis that the low molecular weight of PMP is a result of the rapid occurrence of chain transfer to aluminum. The obtained PMPs were highly isotactic (>98%) according to 13C-NMR spectroscopy and had obvious melting temperatures (205-209 ℃) based on the DSC curves. WAXD analysis confirmed the crystalline architecture of the PMPs. The strain-stress curve of PMP shows brittle fracture characteristics, indicating that PMP is a brittle material with a fracture elongation of 11%. This study clearly demonstrates that [OSSO]-type hafnium complexes are rare non-metallocene catalysts for the isotactic polymerization of 4M1P, and also provide access to the enhancement of PMP molecular weight by suppressing chain transfer to aluminum.关键词：Hafnium catalyst;4-Methyl-1-pentene;Isotacticity;Chain transfer95|2|0更新时间：2025-07-28
- 摘要：This study systematically investigates the molecular design and photolithographic process optimization of positive photosensitive polyimide (p-PSPI) photoresists, aiming to advance their application in high-resolution microelectronic fabrication. A novel strategy is proposed to synergistically regulate the esterification ratio of polyimide precursor resins through isoimide pretreatment and controlled esterification. By optimizing the pretreatment conditions of polyisoimide and conducting kinetic analysis, the critical parameters governing the esterification reaction are identified. The optimal process conditions, including an esterification time of 2 h and a temperature of 50 ℃, significantly enhance the structural regularity and photochemical reactivity of the precursor. Structural characterization reveals that the pretreatment facilitates the conversion of polyisoimide into linear amic acid structures, thereby increasing the accessibility of reactive carboxyl groups for esterification. To further optimize the lithographic performance, an orthogonal experimental design is employed to systematically evaluate the synergistic effects of key process variables, including developer concentration, photosensitizer content, and pre-baking conditions. This approach elucidates the interplay between development kinetics and photochemical crosslinking efficiency, enabling a balanced optimization of sensitivity and resolution. Experimental results demonstrate that the optimized p-PSPI exhibits excellent photosensitive under 365 nm ultraviolet irradiation, achieving a contrast ratio of 2.5 and sensitivity of 70 mJ/cm2. High-resolution patterning capabilities are confirmed, with resolutions of 10 μm on glass substrates and 3 μm minimum feature size on silicon wafers. The cured p-PSPI films display outstanding mechanical properties and thermal stability, meeting the stringent requirements for high-density integrated circuit packaging. The mechanical robustness and thermal resistance are attributed to the well-controlled esterification and crosslinking networks formed during the photolithographic process. This study establishes a synergistic framework for tailoring both molecular architecture and processing parameters, providing a versatile platform for developing high-performance polyimide photoresists. The proposed p-PSPI demonstrates broad potential in advanced applications such as high-precision micro-nano fabrication, flexible electronics, and next-generation semiconductor packaging, offering a viable solution for emerging technological demands in the electronics industry.关键词：Photosensitive polyimide;isoimidization;esterification;photolithography;photosensitivity200|44|0更新时间：2025-07-28
- 摘要：Polycarbonates (PCs) are widely applied in various fields due to their excellent thermomechanical properties, optical performance, processability, and electrical insulation. However, the relatively low refractive index (nd=1.585) of conventional PC restricts its application in high-end optical devices. In this study, we synthesized the 2,2'-bis(2-hydroxyethoxy)-1,1'-binaphthyl (BHEBN) monomer. Subsequently, BHEBN-PC homopolymer was successfully prepared via melt transesterification using BHEBN and diphenyl carbonate (DPC) as comonomers. The molecular weight and distribution of BHEBN-PC were analyzed by gel permeation chromatography (GPC), with systematic investigations into the effects of catalyst type, catalyst loading, transesterification temperature and duration, polycondensation temperature and time, and monomer feed ratio (nDPC:nBHEBN). Under optimized conditions (catalyst: KF/MgO, catalyst loading: 0.05 wt%, transesterification time: 45 min, polycondensation temperature: 210 ℃, monomer molar ratio: nDPC:nBHEBN = 1.0), high-molecular-weight BHEBN-PC was synthesized with Mn = 6.40×104 g/mol, Mw = 1.05×105 g/mol, and polydispersity index (PDI) = 1.63. The chemical structure of BHEBN-PC was confirmed by Fourier transform infrared spectroscopy (FTIR), nuclear magnetic resonance (1H-NMR, 13C-NMR). Thermal properties were evaluated using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), revealing a glass transition temperature (Tg) of 124 ℃, 5% weight loss temperature (Td,5%) of 350 ℃, and maximum decomposition temperature (Td,max) of 393 ℃. Hydrophobicity and optical performance were characterized via contact angle measurements, transmittance/haze tests, and Abbe refractometry. The BHEBN-PC copolymer exhibited exceptional optical properties, including a refractive index (nd) of 1.656, transmittance of 88.540%, haze of 1.180%, and remarkable hydrophobicity (water contact angle: 98.85°). These results demonstrate that BHEBN-PC offers novel insights and potential for developing advanced optical materials.关键词：Optical polycarbonates;Highly refractive materials;Binaphthyl group;Melt transesterification128|103|0更新时间：2025-07-28
- 摘要：Although some progresses have been made for flame retardant epoxy vitrimer, its actual application is seriously limited at the cost of sacrificing the thermal stability and mechanical properties of flame retardant materials. In this study, 10-(2,5-dihydroxyphenyl)-10-hydrogen-9-oxa-10-phosphaphenanthrene-10-oxide (ODOPB), which has a rigid polyphenyl ring structure and simultaneously containing phosphorus and phenolic hydroxyl groups, was introduced as a flame retardant co-curing agent. A reprocessable intrinsic flame retardant epoxy resin based on dynamic transesterification reaction (ODOPB/EV) was successfully prepared. The introduction of ODOPB significantly improves the comprehensive properties of the material: the tensile strength of 0.3ODOPB/EV reaches 75.2 MPa, which is nearly 90% higher than that of the unmodified system; the initial decomposition temperature increases to 343 ℃, which is 18 ℃ higher than that of the unmodified system; compared with the unmodified system, the peak heat release rate and total heat release of 0.3ODOPB/EV are reduced by 47% and 36% respectively. The relaxation time of the epoxy resin at 200 ℃ is only 241 s, which has excellent dynamic properties. The epoxy resin has a good balance between flame retardancy, thermal stability, mechanical properties and reprocessability.关键词：Epoxy;Reprocessability;Flame retardancy;Transesterification;Phenolic-hydroxyl dynamic Networks147|90|0更新时间：2025-07-28
- 摘要：In this study, a series of flavonoid-based benzoxazine monomers were designed and synthesized, and the correlation mechanisms among the molecular structures with different functionalities of resins and their curing mechanisms, as well as the thermal stability and flame retardancy of thermosets were systematically investigated. The molecular structures of the benzoxazine monomers were confirmed by nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR), and the structural evolution of the polymerization process and the corresponding curing mechanism of benzoxazine monomers were investigated by differential scanning calorimetry (DSC) and in situ FTIR spectroscopy. Intramolecular hydrogen bonding between the phenolic hydroxyl and its adjacent carbonyl group in benzoxazines was identified as the underlying cause of the thermally latent catalytic curing behavior. In addition, the thermoset derived from apigenin-based bi-benzoxazine exhibited remarkably high thermal stability (Td5 = 384 ℃), while polybenzoxazine obtained from luteolin-based tri-functional benzoxazine showed outstanding flame retardancy (HRC < 10 J·g-1·K-1). The aforementioned studies suggest that thermosetting resins derived from flavonoid bio-based sources hold significant promise for utilization in high-performance applications.关键词：Bio-based;Benzoxazine;High thermal stability;Flame retardancy;Latent catalytic curing138|81|0更新时间：2025-07-28
- 摘要：Since the 20th century, the self-assembly of macromolecules has been a major focus in polymer science research, with block copolymers serving as a typical example. These systems form a variety of aggregates with distinct morphologies in selective solvents. Recently, the phenomenon of co-nonsolvency, where macromolecules become insoluble in a mixture of two miscible solvents, each of which is a good solvent for the macromolecules, has attracted widespread attention from researchers. In this study, we investigate the self-assembly of AB diblock copolymers in binary solvent mixtures using a simulated annealing technique. We examine the influence of the volume fraction of the A-blocks (fA), as well as the properties and composition of the mixed solvents, on the self-assembled behavior of diblock copolymers, and construct phase diagrams for various systems. In our simulations, both O- and S-solvents are good solvents for the B-blocks, with S-solvents exhibiting a stronger attraction for B-blocks than O-solvents, while S-solvent is a poor solvent for the A-block. Our study reveals that when the volume fraction of S-solvent CS is small and when fA is small, or when the repulsive interaction between the A-block and S-solvent is weak, the co-nonsolvency effect of B-block predominantly leads to the formation of the micelles with a B-core and an A-corona. Conversely, when CS is large and the repulsive interaction between A-block and S-solvent is significant, this repulsion predominantly leads to the formation of the micelles with an A-core and a B-corona. When CS is intermediate, or when CS is small but fA is large, the combined influence of these competing effects allows for the formation of diverse micelles, including patchy micelles, aggregated micelles, lamellae micelles and garlic-shaped micelles. By calculating the average contact numbers between segments and solvents, as well as the radial density distribution of the different components, we find that the micelle cores induced by the co-nonsolvency effect contain a significant amount of S-solvent, accompanied by liquid-liquid phase separation of the S-solvent; whereas the micelle cores induced by repulsion do not contain any solvent. This work provides theoretical guidance for understanding and designing novel self-assembled micelles associated with the co-nonsolvency effect.关键词：Simulated annealing;Diblock copolymer;Mixed solvents;Co-nonsolvency;Self-assembly251|94|0更新时间：2025-07-28
- 摘要：In order to improve the brittleness of poly(butylene terephthalate) (PBT) materials, poly(butylene diethylene glycol terephthalate) (PBDT) copolyesters with varying compositions were synthesized through melt-polycondensation, using dimethyl terephthalate, butanediol, and diethylene glycol (DEG) as monomers. The crystallization behavior, thermal, mechanical, and degradation properties, as well as the hierarchical structural evolution during stretching of PBDT copolyesters were systemically investigated. The results show that, the incorporation of DEG units significantly reduces the melting temperature and crystallization ability of the copolyesters compared to PBT, but does not alter their crystal structures. The thermal decomposition temperature of PBDT copolyesters is increased, and they exhibit excellent mechanical properties, particularly a significantly higher elongation at break compared to PBT. The crystal structures of both PBT and PBDT copolyesters remain unchanged during stretching at 80 ℃. However, crystal orientation and cavitation are more easily formed in the PBDT copolyesters compared to PBT. The incorporation of DEG units also enhances the degradation rate of the PBDT copolyesters, which is attributed to the reduced crystallinity and increased hydrophilicity of the copolyesters.关键词：Poly(butylene terephthalate);Diethylene glycol;Crystal structure;Structural evolution;Mechanical property146|148|0更新时间：2025-07-28
Research Article
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