最新刊期
卷 38 ， 期 9 ， 2025
- 摘要：Tumor microenvironment-responsive drug carriers exhibit unique advantages in cancer therapy. Amino acid molecules have garnered extensive attention and application in the field of responsive drug carriers due to their excellent biocompatibility, biodegradability, distinctive bioactivity, and ease of modification. This review summarizes the design, preparation, and antitumor applications of various stimulus-responsive poly(amino acid)-based nanodrug carriers, including endogenous stimuli (such as pH, reactive oxygen species, glutathione, temperature, and enzymes) and exogenous stimuli (for example light). Based on this, future research directions for tumor microenvironment-responsive poly(amino acid) drug carriers are discussed, aiming to provide insights and references for the development of poly(amino acid)-based drug delivery systems.关键词：Tumor microenvironment;Polyamino acids;Drug carriers;Stimulus-responsive;Cancer treatment11|4|0更新时间：2025-08-26
- 摘要：Olefin-based materials have been widely used because of their excellent properties. However, inevitable tiny cracks during the service process may lead to degradation of properties, even safety issues. Olefin-based self-healing polymer materials can prevent the growth of tiny cracks in the early stage to overcome problems mentioned above. It is of great significance to improve usage safety, extend lifecycle, decrease resource waste and environmental pollution for olefin-based materials. This work introduces the research progress of olefin-based self-healing polymer materials. Taking the self-healing mechanisms as the main line, olefin-based self-healing polymer materials are divided into chemically olefin-based self-healing polymer materials and physically olefin-based self-healing polymer materials. Chemical methods are mainly based on dynamic reversible covalent bonds and partial non-covalent bonds, while physical methods typically refer to the action of non-covalent bonds. In this review, we introduce the preparation methods, self-healing mechanisms, and self-healing properties of the materials. Furhtermore, we also discuss the disadvantages of the existing technologies, and future development of self-healing polyolefin materials.关键词：Olefin-based polymer materials;Self-healing;Chemical interaction;Physical interaction9|17|0更新时间：2025-08-26
- 摘要：Post-polymerization modification has been applied to upgrade and transform waste plastics. This can endow plastics with new functions and properties while maintaining the integrity of the polymer backbone, providing another feasible method for recycling waste plastics. Recent progress in the conversion of waste plastics into value-added materials using post-polymerization modification and upgrading methods has been reviewed. This review focuses on the research achievements regarding the application of post-polymerization modification methods for the functional modification of polystyrene (PS), poly(vinyl chloride) (PVC), polyethylene (PE), polypropylene (PP), and poly(ethylene terephthalate) (PET). Moreover, it presents thoughts and prospects for future research in this field, providing a relevant basis and reference for more in-depth follow-up research.关键词：Waste plastics;Post-polymerization modification;Chemical modification;Value-added materials19|57|0更新时间：2025-08-26
- 摘要：The development of high-performance nanometal catalysts is closely related to the development of energy conversion and storage, environmental protection, and industrial applications. In this work, monodisperse silica nanospheres with a particle size of 60 nm were precisely prepared by Stöber method, followed by the surface modification with 3-glycidoxypropyltrimethoxysilane (KH560) to obtain a series of epoxy (EO)-functionalized silica nanospheres (SiO2-EO) with different EO content. Based on the interaction between Ag+ ions and EO groups and the redox reaction between EO and ethanol, silver nanoparticles with a size of 6 nm were uniformly and stably loaded on the SiO2-EO nanosphere carriers, resulting in the successful preparation of the novel Ag/SiO2-EO composite nanosphere catalyst. The dependence of the morphology and loading capacity of silver nanoparticles on Ag/SiO2-EO on the EO content of the SiO2-EO nanosphere carrier was studied. The result shows that EO has a stronger affinity toward Ag+ ions than Si―OH groups, which makes the epoxy-functionalized silica nanospheres an excellent support for silver nanoparticles. Moreover, the EO content on the carrier nanospheres determines the loading capacity of silver nanoparticles. Therefore, stable and efficient loading of silver nanoparticles on SiO2-EO nanospheres can be achieved by precise regulation of the relative content of EO and Ag+ ions. The Ag/SiO2-EO composite nanospheres were applied to the model reduction of methylene blue by NaBH4. The result shows that the prepared composite nanospheres exhibit excellent catalytic activity and recyclability. This work not only provides theoretical and practical references for the epoxy-functionalized nano-silica carriers and the in-situ precise loading of metal nanoparticles, but also expands the application fields of nano-silica carriers, providing novel strategies for developing advanced nanometal catalytic systems and high-performance epoxy resin composites.关键词：Silica nanosphere;Epoxy-functionalization;Nanometal composite catalyst9|14|0更新时间：2025-08-26
- 摘要：As the sole component of an aircraft that comes into contact with the ground during takeoff and landing, the tread rubber material of aviation tires is subject to complex working conditions such as high-speed impact and extreme temperature rise. The wear behavior of the tread rubber material under these conditions directly affects flight safety and service life. In this study, a comprehensive rotating wear test was conducted to systematically simulate the dynamic wear process of the tread rubber material under the takeoff landing cycle conditions of an aircraft. The effects of load, travel speed, takeoff landing cycle number, and temperature on the wear volume, wear surface morphology, and degradation behavior of the rubber material were investigated. The results show that with the increase of load, travel speed, and takeoff landing cycle number, the surface temperature of the tread rubber material rises significantly, and the wear volume increases. Among them, the sensitivity of the wear volume to each factor is in the order of: test temperature > travel speed > load. When the load is 90 N, the wear volume increases by 70% when the travel speed increases from 45 km/h to 75 km/h; while when the travel speed is 75 km/h, the wear volume increases by 62% when the load increases from 60 N to 90 N. Infrared spectroscopy analysis revealed that the wear debris of the samples showed absorption peaks at 1643 and 1534 cm−1 corresponding to C＝O and COO-, respectively. The peak area increased significantly with the increase of load and travel speed, while the crosslink density decreased. In addition, the wear volume under landing phase was 2.3 times that under takeoff phase, and the temperature was 20 ℃ higher. This study simulated the wear behavior of rubber materials under different takeoff and landing phase of aircraft, providing important experimental basis for the durability assessment and wear failure of aviation tire materials.关键词：Aviation tire tread rubber;Wear volume;Worn surface topography;Thermomechanical rise;Tribological properties2|0|0更新时间：2025-08-26
- 摘要：A series of polyimide prepolymers with number of repeat units of 2 and different contents of in-chain crosslinking active sites were synthesized in N-methyl pyrrolidone (NMP) by chemical imidization using m-phenylenediamine (m-PDA) and 4,4′-(hexafluoroisopropylidene) diphthalic anhydride (6FDA) as the diamine and dianhydride monomers, and 4,4′-(ethyne-1,2-diyl) diphthalic anhydride (EBPA) as the main chain cross-linker in the presence of 4-phenylethynyl phthalic anhydride (PEPA) as the end-capping agent. The structures and properties of these prepolymers were characterized and analyzed. The results showed that the prepared polyimide prepolymers had good melt fluidity in a certain temperature range attributed to the low molecular weight, steric hindrance as well as twisted molecular structures, and the minimum melt viscosity (5.04–6.80 Pa·s) occurred at around 330–340 ℃. With the raise of temperature, both the in-chain and terminal alkynyl groups would undergo cure reactions. The polyimide resins cured at 370 ℃ for 2 h displayed high glass transition temperature (Tg=353–380 ℃), which increased gradually as the rising of the contents of in-chain crosslinking active sites in prepolymers. After the post-cure at 380 ℃ for 1 h, the Tg of resins corresponding to prepolymers with in-chain alkynyl was improved by 6–11 ℃ (up to 391 ℃). The thermally cured polyimide resins had excellent heat stability with 5% weight-loss temperature of 538–546 ℃, 10% weight-loss temperature of 563–571 ℃ and the char yields at 850 ℃ exceeding 59%. Moreover, an effective method to remove residual organic impurities from the product was provided by exploring the washing process of prepolymer powders.关键词：Polyimide;Prepolymer;In-chain crosslinking site;Terminal crosslinking site;Thermal property8|8|0更新时间：2025-08-26
- 摘要：In the process of synthesizing tert-butyl peroxide benzoate (TBPB) using tert-butyl hydrogen peroxide (TBHP) and benzoic acid as raw materials, acetic anhydride as dehydrating agent, acetic anhydride generated after reaction with water as catalyst, when the mass ratio of TBHP/ acetic anhydride is 1.0/2.5, the molar ratio of TBHP/ benzoic acid is 1.0/1.1, the organic solvent of benzoic acid is acetone or ether, and the reaction temperature is 10 ℃, the obtained TBPB has the best quality and the highest yield. It is found that with the acceleration of heating rate, the initial decomposition temperature of TBPB increases, the heat release peak increased, the heat release increased, and the risk increased. With the decrease of TBPB concentration, the initial decomposition temperature increases, the peak value of the exothermic peak decreases, the heat release decreases, the flash point increases, and the safety improves. In addition, when TBPB thermal decomposition occurs, a large amount of hot and irreversible gas will be released, resulting in a simultaneous rise in temperature and pressure. For safety reasons, TBPB can be safely stored, transported and used by adding inert substances such as mineral oil.关键词：Tert-butyl benzoate peroxide;Thermal stability;Initial decomposition temperature;Security2|0|0更新时间：2025-08-26
- 摘要：Strong intermolecular force between anionic polyelectrolytes and cationic polyelectrolytes was used to simulate different aggregation states between proteins in neurodegenerative diseases, and the regulatory mechanism of intermolecular force in the formation of aggregates was demonstrated. It aims to help students in primary, middle and high school understand the pathogenesis of neurodegenerative diseases and stimulate their scientific interest. Compared with proteins in the real pathogenesis process, the polyelectrolyte used in this popular science experiment has the advantages of low cost, easy operation, and stronger intermolecular interaction. All these characteristics can display the relationship between intermolecular force and pathogenesis more intuitively and quickly, which has the features of being operable and easy to be popularized. In addition, the design of this popular experiment is simple and the phenomenon is obvious, which is conducive to the experiment preparation and classroom demonstration of primary, middle and high school teachers. moreover, this popularization of science is more beneficial to the cultivation of students’ scientific qualities such as hands-on practice and thinking expansion.关键词：Polyelectrolyte;Intermolecular forces;Neurodegenerative diseases;Popular science experiment;Liquid-liquid phase separation12|6|0更新时间：2025-08-26
- 摘要：Polymer materials have a wide range of application fields, and have an important impact on modern industry and human life. They have become an indispensable key material to promote social development and scientific and technological progress. Therefore, it is of great significance to provide the general education of polymer materials in the process of talents cultivation. This paper mainly introduces the construction of the core general education curriculum of Sichuan University named Treasurable Products Created by Ingenuity: The Past and Future of Polymers. The curriculum content is based on the theme of “polymer materials and their processing methods and human civilization progress”, narrating the development and change of the polymer materials in the process of history. The curriculum has excellent interdisciplinary teaching team, and adopts the teaching methods of combining popular science teaching with classroom experiments. Teaching effect is good. Simultaneously, the curriculum is also beneficial to enhance the students’ scientific spirit, cultural self-confidence and inheritance consciousness. The construction of this general education curriculum can provide useful reference for other science and technology general education curriculum.关键词：The construction of the core general education curriculum;Polymer;Human civilization;Interdisciplinary teaching team16|3|0更新时间：2025-08-26
- 摘要：The experimental course is a core component of undergraduate education in polymer science. The integration of cutting-edge knowledge and undergraduate experimental teaching has become a key direction in higher education reform. Flexible and stretchable electronics, as major disruptive innovations, are of significant importance in serving national strategic needs, promoting the development of new quality productivity, and leading the transformation of future industries. This study focuses on stretchable solar cells and designs a comprehensive experiment in polymer science. Using the low-cost conjugated polymer material polythiophene as the research object, a thermoplastic elastomer physical blending strategy was adopted to modulate the morphology of the active layer, which significantly improved the stretch ability of solar cells. Accordingly, an intrinsically stretchable polymer solar cell was prepared. Based on the integration of multidisciplinary knowledge, the experiment helped students systematically master relevant theories and experimental skills, improving their ability to comprehensively apply professional knowledge. It holds great potential for broader applications and is well suited for experimental teaching reform and practice in polymer science programs.关键词：Polymer science;Comprehensive experiment;Polymer solar cells;Stretchable electronics;Teaching reform0|0|0更新时间：2025-08-26
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