最新刊期
卷 30 ， 期 3 ， 2017
- 摘要：Thermoplastic polymer composites (TPCs) have been widely applied as structural materials due to their superior mechanical properties and prolific besides their low costs. On the basis of the nature of viscoelasticity, the deformation of TPCs will inevitably increase with time extension under a constant stress. This phenomenon is called creep, which is followed by irrecoverable damages such as permanent deformation and fracture. Thus, creep can seriously decrease the durability of TPCs and limit their applications. This review discusses the essence and mechanism of creep on TPCs in detail. More importantly, the influencing rules of various factors, such as the molecular structure, fillers, stress, and temperature, and so on, on creep and properties of TPCs are analyzed and summarized. Based on these rules, the negative effect of creep can be controlled reasonably. This review also suggests a suitable methodology for obtaining TPCs with high creep resistance concisely. This is of great theoretical and practical value to fabricate materials with excellent comprehensive properties and achieve the application of them and their products.关键词：Thermoplastic polymer;Creep;Filler
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发布时间：2022-09-06
特约稿
- 摘要：Poly-ε-caprolactone(PCL) is a synthetic polyester with excellent biocompatibility, biodegradability, non-immunogenicity and non-toxic to human body. Due to its good compatibility with other polymers, it can be prepared into a variety of copolymers or blends with excellent properties. Therefore,research about PCL and its copolymers and blends as drug carriers have stolen the spotlight of synthetic macromolecular drug delivery systems. In addition, due to its long-term degradation in vivo, PCL used as materials for controlled release of drugs has already received US FDA’s approval. In this article, progresses in PCL synthesis and modification and its formulations of drug delivery system are reviewed.关键词：Poly-ε-caprolactone;co-Polymer;Hydrogel;Nanoparticles;Micelle;Vesicle
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发布时间：2022-09-06 - 摘要：Owing to the specific aromatic heterocyclic structures in the polymer chains, polyimide (PI) fibers exhibit superior mechanical as well as thermal properties, excellent radiation resistance, good dielectric performance and chemical stability. Therefore, they have potential applications in aerospace, high-temperature resistance, flame retardance, electronic industry and nuclear energy. Thus, PI fibers are considered as one of the most promising high-performance fibers in the 21st century. Recently, a number of advances have been made for PI fibers to be increasingly explored along with the development of more monomers selection and spinning technology, which greatly promotes the industrialization and development of PI fibers. This review discusses the research progresses of high-performance PI fibers at home and abroad, and analyses the effects of chemical structure, spinning condition and imidization process on the properties of PI fibers and meanwhile, the development prospect of PI fibers is proposed.关键词：Polyimide fibers;Chemical structure;Drawing ratio;Imidization
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发布时间：2022-09-06 - 摘要：Waterborne glazing coating on paper was the coating used for ploshing and finishing of packaging materials, with the advantages of low cost, non-polluting, non-toxic harmless, excellent performance, convenient transportation, etc, which was the main direction of development in the current printing coating. At present, the domestic waterborne glazing coatings on paper with the diversified production technology, uneven quality, high cost, and the watertightness, abrasion resistance, and gloss performance were not up to high-grade printing requirements, 70% of high-grade waterborne glazing coating on paper need to rely on imports. Recent development of waterborne glazing coating on paper at home and abroad was reviewed in a systematic way. Recent development of waterborne glazing coating on paper at home and abroad was reviewed in a systematic way. Some features and applications on waterborne glazing coating on paper were introduced, and a new method for preparing waterborne glazing coating on paper was indicated.关键词：Waterborne;Glazing coating on paper;Preparing
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发布时间：2022-09-06 - 摘要：In this paper, the basic principle of microcellular foamed polymer-based conductive composites using supercritical fluid as a physical foaming agent is briefly introduced. Several conductive mechanisms of polymer-based composites and its microcellular foamed materials are reviewed. The research status of these composites on the electrical properties in recent years are illustrated summarily. The main factors, such as the characteristics of the matrix, the type of nano-sized conductive fillers, the filler loading content, the dispersion methods of the additives in the matrix, and the cell morphology, which affect the electrical properties of microcellular foamed polymer-based conductive composites are analyzed. Finally, the research trends of the novel microcellular foamed polymer-based conductive composites is prospected.关键词：Microcellular foaming;Conductive composites;Electrical properties
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发布时间：2022-09-06 - 摘要：The refrigeration state simulation equipment was be established, to research the fluid flow characteristics in spinning assembly. The results show that:the use of glucose syrup solution as PA6 melt the analog medium was feasible, syrup viscosity PA6 melt viscosity was similar to the viscosity values under certain conditions and variation similar syrup viscosity with increasing shear rate appears shear thinning phenomenon;the viscosity of syrup at a temperature of 21℃ was close to viscosity of PA6 melt at 265℃, the syrup as an analog medium was feasible. Flow characteristics in a transparent spinning assembly through the analog medium show:fluid flow in the spinning pack sand in the chamber was not ideal plug flow, the residence time of the gland below the material than four weeks long, was not conducive to the uniformity of material properties. The results of this study to optimize the spinning pack to lay a certain foundation.关键词：Spinning pack;Cold simulation;Syrup;Residence time;Visualization;Flow field characteristics
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发布时间：2022-09-06 - 摘要：In this paper, we used corn starch as raw material, and tnen preparation the crosslinked starch, tne etherified starch,the amino starch and the DTC modified starch, then study the best preparation conditions of the four kinds of starch. The FTIR and SEM analysis were carried out on all of this samples. Analyze DTC modified starch by sulfur element analysis and conducted the chelating CuSO4 solution experiments.The FTIR and SEM analysis showed that the starch was modified successfully,in neutral CuSO4 solution, the chelating properties increased with the increase of the sulfur content of DTC modified starch,then compared chelating propertie in different CuSO4 of pH solution, when pH=11,sulfur content of 1.54% (WT) of the DTC modified starch dosage of 0.10g, the chelating properties reached the highest value of 500.9mg/g.关键词：Corn starch;Heavy metal;Chelating agents;Chelating propertie
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发布时间：2022-09-06 - 摘要：A Monte Carlo simulation method of acrylonitrile/itaconic acid copolymerization is established. Firstly it is used for the calculation of copolymer composition under different pH values when the monomer reactivity changes. The results are consistent with experiment, which proves the accuracy of the model. On this basis, the change law of acrylonitrile copolymer chain structure is analyzed theoretically, which points out the heterogeneity of copolymer composition and sequence structure in traditional polymerization process. According to the simulation results, a feasible strategy is proposed to control the composition and sequence structure of copolymer. It shows that the instantaneous composition and sequence structure of copolymer can be effectively controlled by feeding the ITA monomer at different stages of polymerization. This strategy can improve the uniformity of copolymer composition and sequence structure, which contributes to the improvement of carbon fiber property.关键词：Copolymerization;Sequence structure;Monte Carlo simulation
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发布时间：2022-09-06 - 摘要：Radical polymerization is the important content to study the course of polymer chemistry. Polymerization rate, polymerization degree distribution and degree of polymerization are important goals of learning, and then disproportionation termination, coupling termination and chain transfer will contribute to different distribution of polymerization degre and the related documents and materials have less analysized the influence for the polymerization degree distribution under the condition of chain transfer. Based on the method of free radical polymerization degree, the paper discusses the radical polymerization involving polymerization degree distribution of termination in different ways and chain transfer. This article focused on the two kinds of calculation of analysis in detail and compared with the experimental results, under the presence of chain transfer,then showed the characteristics of two kinds of calculation, the cause of deviation and the detailed theoretical results, in order to help beginners better understand and study the part of the related content.关键词：Distribution of degree of polymerization;Coupling termination;Disproportionation termination;Chain transfer
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发布时间：2022-09-06 - 摘要：With the vigorous development of materials science, the variety and use of functional polymer materials are increasing. Thus, the teaching contents for functional polymer materials cover more and more. In light of the mechanism and aim of polymer materials and engineering specialty in local engineering colleges, the authors explored how to select and optimize the teaching contents oriented by students and the talent demand of society and industry, according to close contact with local economic pattern and circumstance. Based on these optimized teaching contents accompanying with scientific and reasonable teaching practice, students can achieve a firm grasp of the fundamentals of functional polymer materials and learn the newest advances in this field. Furthermore, it would help them broaden learning ideas, improve learning enthusiasm, and enhance their professional recognition with more expectations of the industry.关键词：Functional polymer;Optimization of teaching contents;Industry pattern;Local economy
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发布时间：2022-09-06 - 摘要：With the increase in the national demand for the applied and innovative talents, college education, especially graduate cultivating mode, have to be made the corresponding adjustment, and the teaching method reformation is the important part in the reform of talent cultivation mode. The study of course will infulence the students’ scientific research ability, and it is very important to cultivate the students’ professional theoretical foundation and practical ability through the teaching of professional courses. The purpose of this wok is to combine constructivism learning theory with the teaching practice, taking "Polymer Rheology" course as an example, and is rooted by student’ study as well as to reform the specifical teaching methods, in oder to explore the application of the anchored teaching mode in the teaching.关键词：Constructivism learning theory;Polymer rheology;Teaching;Application;The innovation ability
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发布时间：2022-09-06
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