最新刊期
卷 38 ， 期 8 ， 2025
- 摘要：Flexible hydrogel-based strain sensors possess various advantages such as high flexibility, high sensitivity, wide linear response range, and excellent biocompatibility and processing performance, which have attracted significant attention from researchers. These advantages enable them to have great potential for applications in fields such as wearable electronic devices and human-computer interactions. This review briefly introduces different types of strain sensors and then focuses on their recent advances, as well as their sensing mechanisms, advantages and disadvantages, and optimization strategies. Subsequently, the factors influencing the performance of hydrogel-based flexible strain sensing materials, including sensitivity, detection range, self-healing ability, adhesion, and biocompatibility, were systematically discussed. Finally, this review discusses the current challenges and future development trends of hydrogel-based flexible strain sensing materials.关键词：Polymer-based flexible sensing materials;Strain sensor;Conductive hydrogels;Sensing mechanism;Wearable electronics157|59|0更新时间：2025-07-15
- 摘要：Ethylene-butadiene copolymers have long been a research focus because of their unique physical and mechanical properties and broad application potential. This review provides an overview of the progress in catalytic systems for ethylene-butadiene copolymerization, with an emphasis on the applications of Ziegler-Natta, metallocene, constrained geometry, non-metallocene, and rare-earth metal catalysts in copolymerization. Rare-earth metal catalysts exhibit significant advantages in terms of activity, butadiene insertion rate, and sequence distribution, achieving an activity of 1640 kg/(mol·h) and butadiene insertion rate of 89 mol%. In contrast, Ziegler-Natta catalysts have lower activity and often produce mixtures containing polyethylene or polybutadiene; metallocene catalysts have lower activity and butadiene insertion rates and tend to form cyclic structures; constrained geometry catalysts, although improved in activity and butadiene insertion rate, are sensitive to butadiene concentration; and non-metallocene catalysts have made progress in activity and butadiene insertion rate, but the challenge of simultaneously enhancing activity, butadiene insertion rate, and copolymer molecular weight remains to be addressed. This review also discusses the future development directions of ethylene-butadiene copolymerization, highlighting that rare-earth metal catalysts are expected to play an increasingly important role in this field. The development of new catalysts and polymerization methods to achieve the efficient and controlled copolymerization of ethylene and butadiene remains a key focus for future research.关键词：Ethylene;Butadiene;Copolymerization;Coordination polymerization;Elastomer78|28|0更新时间：2025-07-15
- 摘要：Multiphase polymeric systems composed of different polymers have gained broad applications in practical industry because they can combine characteristic performances of the different components along with some specific advantages of multiphase structure. One topic of great research interest in the field lies in the relationship between the microstructure and the macroscopic rheological/mechanical properties of multiphase polymeric systems. In particular, considering the importance of interface for the structure-property regulation of multiphase systems, study of interfacial rheological behavior in multiphase polymeric systems has also attracted much attention in recent years. This review aims to summarizing the latest advancements in this research area. First, the commonly involved interfacial phenomena including interfacial slip, interdiffusion, reaction, and compatibilization, along with their corresponding rheological characteristics, will be introduced. Next, the methods of interfacial rheology characterization, including direct measurements, rheological model predictions, and indirect measurements based on multilayer structures, will be depicted. Finally, the importance of interfacial rheology in regulating the structure- property relation of multiphase systems will be highlighted, particularly shedding light into the morphological stabilization and phase transitions in blend systems as well as the interfacial flow stabilization in multilayer co-extrusion. The review will be ended with a perspective on the existing challenges and a prospect on the future trends.关键词：Multiphase polymeric system;Interfacial rheology;Polymer blends;Structure-property regulation101|23|0更新时间：2025-07-15
- 摘要：The separation of propylene (C3H6) from propane (C3H8) is the critical step in the purification of C3H6 within the petrochemical industry. Membrane separation technology, especially mixed matrix membranes (MMMs), has shown advantages over traditional low-temperature distillation due to its low energy consumption and high efficiency. This paper reviews the application progress of MMMs in the separation of C3H6/C3H8 and discusses the classification, separation principles, preparation methods, and gas transport mechanisms of MMMs, and analyzes the impact of different fillers on membrane performance. Finally, it analyzes the challenges faced by applications for the more efficient separation of C3H6/C3H8 and future development directions.关键词：Mixed matrix membranes;Propylene/propane;Gas separation;Filler material86|287|0更新时间：2025-07-15
- 摘要：Hydrogel-based triboelectric nanogenerators (H-TENG) have emerged as promising flexible devices for wearable electronics owing to their notable mechanical flexibility and electrical conductivity. However, the high energy consumption and time-intensive nature of conventional hydrogel polymerization processes, combined with the degradation of electrical properties and mechanical failure under extreme mechanical or environmental conditions, have severely limited their practical application. To address these challenges, this study presents a self-healing dual-network hydrogel engineered via a polyphenol-metal ion catalytic system for hydrogel sensors and H-TENG. The hydrogel is synthesized through dynamic redox reactions and metal-ligand coordination, utilizing sodium lignin sulfonate (SLS) and Fe3+ ions, which enable the rapid crosslinking of a polyacrylamide-carboxymethyl cellulose (PAM-CMC) dual-network hydrogel without energy-intensive thermal polymerization. The synergistic integration of dynamic metal coordination and hydrogen bonding confers the hydrogel with enhanced mechanical properties and autonomous self-healing capabilities. As a multifunctional platform, the material demonstrated stable strain-sensing responsiveness and consistent triboelectric output, even after severe mechanical damage. This study establishes an environmentally adaptive hydrogel system for self-healing H-TENG, exhibiting reliable performance across broad applications.关键词：Polyacrylamide;Carboxymethyl chitosan;Sodium lignosulfonate;Hydrogel sensor;Tiboelectric nanogenerator85|50|0更新时间：2025-07-15
- 摘要：Poly(lactic acid) (PLA), while recognized as a bone repair material due to its commendable biodegradability, faces constraints in medical application effectiveness stemming from its insufficient osteogenic activity. To enhance its biomedical performance, an efficacious approach involves compounding it with osteogenic active components, such as nano-hydroxyapatite (nHAP). This study initially employs the emulsion solvent evaporation method to fabricate PLA/nHAP composite microspheres, aiming to augment composite homogeneity. Subsequently, these composite microspheres serve as the raw materials for the preparation of PLA/nHAP composites, undergoing a series of processes including hot-press preforming and heat treatment process. The results demonstrate that, at a heat treatment temperature of 130 ℃, the composite microspheres undergo complete melting, leading to a dense material structure with nHAP evenly distributed within the PLA matrix. As the mass fraction of nHAP escalates from 0% to 10%, there is a gradual enhancement in the mechanical properties of the composite material. Specifically, the compression strength, bending strength, and modulus of elasticity exhibit increases of approximately 14% and 42%, respectively. Additionally, the water contact angle diminishes from (70.66±0.64)° to (56.49±0.50)°, signifying an augmentation in hydrophilicity. Furthermore, the PLA/nHAP composite material maintains a steady release of Ca2+ and PO43−. Cellular testing reveals that the PLA/nHAP composite material is non-cytotoxic, and the incorporation of nHAP fosters osteoblast adhesion and proliferation over a 7-day period. After 14 days, significant osteogenic differentiation effects become apparent. In conclusion, this investigation presents a viable technical method for the fabrication of PLA/nHAP composite materials.关键词：Poly(lactic acid);Hydroxyapatite;Composites111|139|0更新时间：2025-07-15
- 摘要：Poly(p-phenylene terephthalamide) (PPTA) can be dissolved in concentrated sulfuric acid (H2SO4) and exhibits a liquid crystalline phase within a certain temperature and concentration range. It can be spun into para-aramid fibers through the dry-jet wet spinning process. The phase behavior and rheological behavior of PPTA/H2SO4 solutions are key factors determining the processing technology and performance of para-aramid fibers. However, there is a lack of convenient research tools. In this paper, a parallel plate fixture resistant to concentrated sulfuric acid was designed and fabricated for a rotational rheometer to reveal the phase transition and shear rheological behavior of PPTA/H2SO4 solutions with different molecular weights. The liquid crystalline texture of PPTA/H2SO4 solutions was observed by polarizing microscopy, and the phase transition temperature and boundaries were determined in combination with the linear viscoelasticity of rheology. The relationship between temperature, mass fraction, PPTA molecular weight and the storage modulus, relaxation time and viscosity of the solution was explored through rheological oscillation scanning and steady shear. The results show that higher concentration PPTA/H2SO4 solutions have a wider temperature range of the nematic phase (N) and a higher critical temperature for phase transition; the modulus, relaxation time and viscosity show non-monotonic changes with increasing concentration; high concentration solutions exhibit nonlinear rheological behavior in steady shear. A further understanding of the phase transition conditions and shear rheological behavior of PPTA/H2SO4 solutions will be of great significance for guiding and improving the spinning process parameters of para-aramid fibers.关键词：Poly(p-phenylene terephthalamide);Phase transition;Modulus;Steady-state shear viscosity74|19|0更新时间：2025-07-15
- 摘要：The stability of surface modified properties is a critical factor in practical applications of surface treatments. Constructing a uniform and stable hydrophobic layer on transparent polymeric materials while preserving their excellent optical transparency is a significant challenge. This study addresses the compromised balance between stability and transparency in the fabrication of hydrophobic layer on poly(methyl methacrylate) (PMMA) surfaces by employing two strategies: alkali pretreatment combined with small-molecule silane coupling agents and a perfluoroalkyl-substituted cationic copolymer (P2). Experimental results demonstrated that the silane-modified surfaces exhibited a reduced transmittance (10% decrease in visible spectrum) due to the micrometer agglomerations observed by SEM. After 10 wastewater treatment cycles, the water contact angle (WCA) sharply declined from 100° to 70°. In contrast, the P2-modified surfaces maintaina a >90% transmittance owing to uniform morphology without agglomeration, and retains WCA above 95° (variation <3°) after identical treatments. The reason is that perfluoroalkyl copolymer forms a covalently bonded and homogeneous hydrophobic layer, significantly outperforming silane agents in optical transparency, uniformity and durability. This work offers a novel approach for surface functionalization of transparent materials and establishes a theoretical foundation for the development of surface modification technologies in polymeric materials.关键词：Plexiglass;Polymeric modifier;Perfluoro aliphatic chain;Stability;Antifouling property51|11|0更新时间：2025-07-15
- 摘要：The impetus for developing the Polymer Physics course stems from the instructors’ pedagogical thinking arising from their teaching experiences. This thinking extends beyond simply updating course content and methods to include the impact of teaching on research approaches and directions. To foster the sharing of innovative ideas and encourage further thinking, the “Polymer Committee of the Alliance of Research Universities in Yangtze River Delta held the 2024 Polymer Physics Teaching Experience Exchange Meeting”. Faculty from five participating universities presented their insights on diverse aspects of Polymer Physics, including crystallization, network structures, rheology, optical and electrical properties, entanglement, and condensed matter theory.关键词：Polymer physics;Pedagogical thinking;Teaching reform79|18|0更新时间：2025-07-15
- 摘要：To better cultivate professional talents with an international perspective and promote the accelerated development of education internationalization, many universities have carried out large-scale all English teaching reforms in professional courses. Nevertheless, hindered by multiple practical challenges, the advancement of the full English teaching reform demands additional optimization. This article analyzes and summarizes the current situation of all English teaching in polymer-major courses in universities, based on years of experience in teaching New Polymer Products and Their Forming Methods. It also proposes six improvement strategies, including prioritizing student-centered and individualized teaching, enhancing professional training for instructors of full English-taught courses, establishing reasonable evaluation methods and incentive mechanisms, utilizing internet technology and a blended online-offline teaching model, preparing and refining the selection and compilation of full English teaching materials, and considering the recruitment of international students along with the development of full English-taught specialized courses. This provides an important reference for universities to better promote full English teaching of professional courses and strengthen international education.关键词：Higher education institutions;Professional courses;Teaching reform;International education;English teaching64|34|0更新时间：2025-07-15
- 摘要：Nonwoven product design is the core content of practical teaching of nonwoven materials and engineering major. Based on polymer melt spinning and solution spinning technologies, this experiment is designed to prepare the sound-absorbing composites with multilayered gradient structure and multi-scale pore size by fiber three-dimensional network reconstruction method, and the influence of the preparation process on the structure and sound-absorbing properties of the prepared materials was explored. Different from the traditional nonwoven product design course, which only carries out simple replication and repeated verification of nonwoven products used in conventional air filtration, this experimental design integrates the cutting-edge achievements of fiber-based porous sound-absorbing materials into the comprehensive experimental teaching of nonwoven major, introduces advanced forming technology of nonwoven composites, and guides students to independently explore the preparation and performance optimization of sound-absorbing materials. The high-order nature, innovativeness and challenge level of the course has been enhanced. This experimental teaching project could enable undergraduate students to have a more intuitive and in-depth understanding of the sound absorption mechanism, key factors, structure and design path of fiber-based porous sound-absorbing materials. This could also realize the organic integration of nonwoven theoretical knowledge and engineering practice, enhance students’ engineering practice ability to solve complex engineering problems, and cultivates students’ engineering social awareness.关键词：Fiber-based porous sound-absorbing materials;Multilayered gradient structure;Innovative comprehensive experiment;Teaching design77|101|0更新时间：2025-07-15
- 摘要：Education and teaching are not simple indoctrination of knowledge. Improving the practicability, pertinence and value orientation of personnel training has become the core concept of higher education and the key point of promoting comprehensive reform. In view of the teaching objectives and the problems existing in the teaching reform, taking the experimental teaching of Polymer Materials Comprehensive Experiment for the undergraduate major of polymer materials and engineering as an example, the ideological and political education is effectively run through all aspects of teaching, and the integration of “science and education” is the driving force. The systematic experimental teaching system, which includes “scheme design; material construction; structure characterization; performance exploration; reflection and insight”, has greatly stimulated the interest of students in scientific research, cultivated scientific thinking and innovative consciousness, shaped values, and effectively promoted the integrated development of education, science and technology, and talents.关键词：Science and education integration;Course ideology and politics;Teaching reform;Polymer materials comprehensive experiment;The Trinity of education, science and technology, and talents57|41|0更新时间：2025-07-15
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