最新刊期
卷 33 ， 期 6 ， 2020
- 摘要：The electro-induced shape-changing polymer materials (EISCP) are a kind of materials that have shapechanging response to electric stimulation. In other words, under the intermittent or continuous stimulation of an electric field or current, the shape of EISCP would make a specific shape-changing response. And when the electric field or current disappears, the shape tends towards recovery. EISCP have great potential applications in the field of artificial muscles, biomimetic robots, intelligent devices, drug carriers, etc. In this paper, according to the difference of the shape-changing response, the shape-changing mechanisms of electro-induced shape-changing polymer are divided into two types: electric field response type and current response type. And, the research progress and applications in electro-induced shapechanging polymer materials based on dielectric elastomers, ferroelectric polymers, electro-induced liquid crystal elastomers, electro-strictive graft elastomers, carbon nanotube composites, ionic polymer-metal composites, electroinduced shape-changing hydrogels, electro-shape memory polymers and conductive polymers were described in detail. Finally, the problems of electro-induced shape-changing polymer materials researches, such as low response speed, less deformation and shape-changing response highly dependent on "on/off" stimulation, are analyzed, and the future development of electro-induced shape-changing polymer materials are prospected.关键词：Electro-induced shape-changing materials;Polymer;Electric field response type;Current response type;Progress;Applications
- 10
- |
- 12
- |
- 0
发布时间：2022-08-31 - 摘要：As an emerging green solvent, ionic liquids have the advantages of low vapor pressure, high thermal stability, good designability and non-combustibility, and have been widely used in various fields. With the increasing attention to fire safety, the research and development of flame-retardant materials with low (low) toxicity, low smoke, and environmental protection has gradually become the development direction of the flame-retardant field. This review briefly summarizes the latest research progress of ionic liquids in the field of flame retardancy in recent years, focusing on the flame-retardant mechanism and progress of ionic liquids in polymer matrices, and also introduces the application of ionic liquids in cotton fabrics, lithium-ion batteries and other materials. Finally, the application prospect of ionic liquids is prospected.关键词：Ionic liquids;Green solvent;Polymer matrix;Flame retardant
- 13
- |
- 14
- |
- 1
发布时间：2022-08-31 - 摘要：Conductive hydrogels combine the characteristics of hydrogel and the unique electrical properties of conductive polymer, and have the special three-dimensional network structure. The polyaniline (PANI) has been widely used because of its unique conductive properties, therefore, PANI conductive hydrogel is one of the most widely studied conductive hydrogels. The preparation methods and development of PANI conductive hydrogels are reviewed in this paper. Four preparation methods of PANI conductive hydrogel are described in detail: direct filling, in-situ polymerization, chemical crosslinking and physical crosslinking. The traditional methods of preparing PANI conductive hydrogels are direct filling and in situ polymerization, but the obtained PANI conductive hydrogels are composed of insulating hydrogel component and conducting PANI component, and their electrochemical performance are not high. The application of chemical crosslinking method improves the electrochemical properties of PANI conductive hydrogels, while physical crosslinking method is seldom used. Finally, the applications and future directions of conductive hydrogel materials are prospected.关键词：Hydrogel;Polyaniline;Conductivity;Preparation method
- 11
- |
- 15
- |
- 1
发布时间：2022-08-31 - 摘要：Mechanical properties such as elastic modulus, hardness and creep behavior of CB/PP composites filled with carbon black were studied by nanoindentation. The results shows that due to the strengthening effect of carbon black particles on CB/PP composites, elastic modulus and hardness of the composite increased with the increase of CB content. The creep stress index and creep characteristic relaxation time of pure PP and CB/PP composites were obtained, the results show that the increased content of CB not only increases the creep stress index of the composite but also improves the hardness and fatigue resistance. At the same time, with the increasing of CB, the creep characteristic relaxation time of the composite decreases, which indicate that the CB particles effectively hinder the movement of the polymer molecular chain.关键词：Nanoindentation;Elastic modulus;Hardness;Creep stress index;Creep characteristic relaxation time
- 10
- |
- 12
- |
- 0
发布时间：2022-08-31 - 摘要：Sulfobetaine methacrylate (SBMA) is copolymerized with 2,3-dihydroxypropyl methacrylate (GMMA) in the presence of boric acid as crosslinking agent. The prepared material exhibits multi-stimuli responsive shape memory behaviors: it can rapidly recover to its initial shape upon heating,absorbing and moisture in humid environments. The shape memory effect can be well adjusted via incorporation of sodium chloride to induce the dissociation of electrostatic interactions between PSBMA chains, leading to reduced transition temperature and faster shape recovery rate. The dynamic nature of boron ester bonds and electrostatic interaction endows the material with effective and rapid self-healing ability. We also demonstrate the deployment process of the dressing that a sample with an initially circular shape can perfectly fit and tightly bound to the wound site after moisture-induced shape recovery. The proposed zwitterionic polymer can possibly extend the application scope of shape memory polymers and pave a new way for the design of wound dressings.关键词：Moisture-responsive;Zwitterionic polymers;Shape memory polymers;Self-healing;Wound dressing
- 9
- |
- 12
- |
- 0
发布时间：2022-08-31 - 摘要：In order to prepare highly selective molecularly imprinted polymers for drug residue enrichment, the sulfabenzamide (SB) molecular imprinted system was computational aided-design by quantum chemical calculation, and then prepared by surface imprinting in this study. According to the results of natural bond orbit analysis, the configurations of SB and functional monomer complexes were optimized, and an input ratio of 1∶5 (molar ratio) was determined for polymerization. Electron micrographs of outputs showed that the molecularly imprinted layer covered on the surface of microspheres uniformly, infrared spectrums and thermogravimetric analysis confirmed the synthesis was successful. The mass transfer of surface imprinted polymers was fast, and the pseudo-second-order and Elovich kinetic models could fit the dynamic behavior. The adsorption isotherm curve was more consistent with Langmuir model, indicating that the adsorption sites were relatively uniform and specific. The imprinting factor is 1.92, and the separation factors of SB to florfenicol and sulfacetamide were 15.16 and 0.54, respectively. After being reused for 5 times, the adsorption amount is stable above 87%. Through computer-aided design, SB-SMIPs with excellent performance were successfully synthesized, which provided theoretical and practical reference for further revealing the recognition principle of molecularly imprinted polymer.关键词：Sulfabenzamide;Molecularly imprinted technology;Computer simulation;Surface imprinting;Adsorption performance
- 9
- |
- 11
- |
- 2
发布时间：2022-08-31 - 摘要：The popularization of mobile terminals such as smartphones and tablets, as well as the usage of mobile applications, have provided favorable conditions for the development of mobile learning. This paper introduces some measures of the polymer physics curriculum reform in the mobile learning environment, including the construction of cloud teaching platform, the encyclopedia of knowledge contents, the use of mobile app assisted teaching, and the development of social software and hybrid teaching. Through the exploration and practice of mobile learning mode and the analysis of teaching effectiveness, we believe that mobile learning shows obvious advantages in the context of "Internet+" , breaking the time and space restrictions of traditional teaching mode and enhancing students' autonomy. Mobile learning promotes the interaction between teachers and students and the interaction between students and students, which significantly improves the teaching effectiveness.关键词：Polymer physics;Mobile learning;Teaching reform
- 13
- |
- 12
- |
- 2
发布时间：2022-08-31 - 摘要：Polymer chemistry and organic chemistry are inextricably linked. When you teach students the new knowledge points of polymer chemistry, you can review the relevant knowledge points of organic chemistry and explain and expand them, emphasize mutual grafting and mutual penetration between organic chemistry and polymer chemistry. This not only can make it easier for students to understand and accept new knowledge, improve students' interest in learning and animate classroom atmosphere, but also can understand the present by reviewing the past.关键词：Polymer chemistry;Organic chemistry;Teaching;Application
- 9
- |
- 13
- |
- 0
发布时间：2022-08-31 - 摘要：The teaching mode of flipped classroom provides more opportunities for students to participate in learning voluntarily, alleviates the problem of neglecting students’ independent study and supplies the teaching pertinence during teaching process, which has been widely concerned by teachers and researchers. On the basis of analyzing the characteristics of polymer processing course, an idea of applying different mode of flipped classroom was put forward according to the nature and structure of course. This paper introduced two teaching modes of flipped classroom, i.e. the theoretical basis and the processing technique, and resolved the difficulties of flipped teaching on the effectiveness of autonomous learning and the limitation of learning time.关键词：Flipped classroom;Polymer processing;Simulation design;Teaching mode
- 10
- |
- 13
- |
- 0
发布时间：2022-08-31 - 摘要：To enhance the quality of teaching and to cultivate high-quality composite polymer professionals who meet the requirements of the emerging engineering construction, the ideas and measures for the adjustment and reform of the teaching methods of polymer materials and engineering major are discussed under the consideration of the characteristics of polymer science in the present work from the point view of teaching practice. While enhancing the teaching ability of the instructors through teaching to promote research and research to promote teaching in return, it is a better choice to combine the first classroom with the second classroom and to encourage the students to participate in the competition to cultivate students' active learning enthusiasm for the polymer science, scientific thinking, practical ability, innovative spirit and teamwork spirit and international vision, which is of benefit to help in building the emerging engineering construction.关键词：The emerging engineering construction;Polymer;Teaching method
- 12
- |
- 13
- |
- 1
发布时间：2022-08-31 - 摘要：In order to the national call to strengthen application-oriented personnel training, application-oriented undergraduate colleges should focus on the development and application of materials, material modification and material processing. The teaching reform method suitable for the basic course of application-oriented undergraduate material science is put forward according to the characteristics of application-oriented undergraduate colleges and the specific situation of material chemistry major in Tangshan Normal University. This paper discusses the main ideas of teaching reform of basic course of material science from the aspects of teaching content, teaching means and methods, practical teaching links and assessment methods, etc. It has been proved that the students' study interest and the ability to analyze and solve problems can be enhanced through the practical examples in teaching content and the guided teaching method.关键词：Fundamentals of materials science;Applied talent;Teaching reform
- 12
- |
- 12
- |
- 1
发布时间：2022-08-31
- Technical support is provided by Beijing Founder electronics co., LTD 京ICP备09064830号-19
京公网安备11010802024621 - It is recommended to read the content of this site in Chrome&IE9+. Please switch to extreme mode in browser 360.
- Cookies We use cookies to help provide and enhance our service and tailor content. By continuing, you agree to the use of cookies.
0