最新刊期
卷 35 ， 期 1 ， 2022
- 摘要：The comprehensive performance of plastic pipes are excellent, widely used in urban and rural construction in various fields. With the development of the pipe industry, both the high-performance pipes and the advanced pipe processing methods are highly desired. This paper describes the application field of plastic pipe, introduces the extrusion molding production method of plastic pipe, reveals the necessity and importance of developing new pipe fabricating methods, give a brief review on the definition, principles, structure and performance of the vibration extrusion, rotation extrusion, solid-phase die-drawing and filament winding Finally, the development trend of pipe processing in the future is summarized and prospected.关键词：Plastic pipe;Vibration extrusion;Rotation extrusion;Solid phase die-drawing;Filament winding
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发布时间：2022-09-09 - 摘要：The excellent biocompatibility and biodegradability of sodium alginate give it wide applications in the field of biomedicine. How to use sodium alginate to manufacture biomedical materials, tissues and organs has become one of the important challenges to promote its excellent performance in medical applications. 3D printing technology gets the advantages of controllable design of structure and high utilization rate of materials, which can realize personalized manufacturing. In this paper, the latest applications of 3D printing sodium alginate based materials in bone tissue engineering scaffolds, artificial blood vessels, in vitro construction of tumor models, artificial organs and other aspects in tissue engineering were discussed and prospected.关键词：3D printing;Alginate;Hydrogel;Tissue-engineering
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发布时间：2022-09-09 - 摘要：Most polymers have poor thermal conductivity and other shortcomings, which limit their applications in many fields. Therefore, it is necessary to add thermal conductive fillers to enhance the thermal conductivity of polymers and improve the use value of materials. However, it is difficult to uniformly disperse the thermally conductive filler into the polymer, which greatly restricts its application in high-performance thermal interface materials. Therefore, it is necessary to functionalize the filler to improve its dispersibility and reduce the interfacial thermal resistance between the filler and the matrix. Regardless of the type of surface functionalization, phonon transmission between fillers will inevitably be weakened. Designing structures by chemical vapor deposition, sol-gel method and other methods can significantly reduce the interface contact thermal resistance between filler particles. Constructing a three-dimensional thermally conductive connection network is an effective and feasible strategy to reduce the interface thermal resistance between filler particles.关键词：Heat conduction;Dispersibility;Filler surface functionalization;Three-dimensional thermally conductive network;Interface thermal resistance
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发布时间：2022-09-09 - 摘要：Because the wound dressing protects the wound from further exogenous microorganisms and pain. Wound dressing plays a vital role in wound healing process. In the development of different wound dressings, asymmetric membranes have received extensive attention. Because it presents a layered morphology similar to the result of the epidermis and dermis of healthy skin, and it can reduce the penetration of bacteria while avoiding wound dehydration and accumulation of exudate. Among the materials used to produce asymmetric membranes, chitosan (CS) has become one of the most promising materials. It has unique characteristics such as anti-microbial, anti-inflammatory, low immunogenicity, maintenance of tissue adhesion, antioxidant properties, low toxicity, biodegradability and hemostatic properties. Therefore, this article introduced the preparation method of CS asymmetric membrane and its application in wound healing.关键词：Chitosan;Polymer materials;Asymmetric membrane;Wound dressing
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发布时间：2022-09-09 - 摘要：Due to its good biocompatibility and biodegradability, polylactide (PLA) has a wide range of applications in many fields. However, the application of PLA is limited by its poor heat resistance, and it is challenging to be chemically modified nor functionalized. In recent years, lots of studies on the chemical modification and functionalization of PLA were carried out. In particular, synthesis and polymerization of lactones with different structures were developed, which providing an efficient approach to develop PLA-derived polymers with given side-chain structures by ring-opening polymerization. While retaining the biodegradability and biocompatibility of PLA, these PLA-derived polymers could possess better heat resistance and rich functionality. This review will introduce two methods for preparing PLA-derived polymers: direct chemical modification and ring-opening polymerization of lactones. Also, the application of PLA-derived polymers are summarized.关键词：Polylactide;Lactide;Polyester;Chemical modification;Functionalization
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发布时间：2022-09-09 - 摘要：Environmental friendly flame retardants for textiles had less harm to human body and environment, which was in line with the concept of green development. Traditional flame retardants such as halogen flame retardants had higher flame retardant efficiency, but they could release a lot of toxic and corrosive gases when used. Nitrogen, phosphorus, boron, silicon and other flame retardants were not ideal when they were used alone, and the cost was high. Therefore, they need to be combined with other flame retardants to achieve the flame retardant effect. The compound synergistic technology avoided the defect of using a single flame retardant, integrates the advantages of various flame retardants, reduces the addition of flame retardants, and improves the flame retardant performance of textiles. In order to further improve the flame retardancy of textiles, we can optimize the flame retardant finishing methods of textiles. Various surface treatment technologies, such as sol-gel method, nanoparticle adsorption, layer by layer self-assembly, plasma treatment, biological macromolecule deposition and graft copolymerization modification, are introduced in this paper. The synergistic technology of flame retardant was applied to various surface treatment technologies of flame retardant finishing, which improved the flame retardancy and washing resistance of textiles, and maintained the original properties of textiles. In this paper, the research on synergistic technology of flame retardant compounding was described in detail, the problems existing in the current flame retardant industry were briefly described, and the corresponding solutions were put forward. Finally, it was pointed out that bio based flame retardant and multifunctional flame retardant textiles are the development trend of textiles in the future.关键词：Flame retardant;Textiles;Compound synergistic effect;Flame retardant finishing;Trend
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发布时间：2022-09-09 - 摘要：In the present work,flame-retardant and antibacterial(GO/bPEI)n-APP wool fabric are fabricated by depositing alternately negatively charged GO and positively charged branched polyethylenimine (bPEI) and spraying a layer of ammonium polyphosphate (APP) on the wool surface. The results of flame retardant property analysis, thermogravimetric analysis, thermal conductivity test and antibacterial property analysis show that the flame retardant and antibacterial properties of the wool fabric modified by (GO/bPEI)n-APP were significantly improved. The limit oxygen index of (GO/bPEI)7-APP modified wool fabric was 30%, and the antibacterial rate against S. aureus was 47%. After reducing GO to rGO, the amount of APP adsorbed on the surface increased. The limit oxygen index of (rGO/bPEI)7-APP modified wool fabric reached 35%, and the antibacterial rate against S. aureus was up to 64%.关键词：Graphene oxide;Polyethyleneimine;Ammonium polyphosphate;Flame retardant;Antibacterial;Wool fabric
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发布时间：2022-09-09 - 摘要：The chloroprene Rubber (CR)/natural Rubber(NR) compounds were prepared by adding chlorinated butyl rubber or cardanol as compatibilizers of CR/NR blends. CR/NR blends were vulcanized at 160℃according to the optimum curing time. The results of rubber processibility analyzer (RPA) showed that cardanol made that the storage modulus and the optimum curing time of the CR/NR compounds were all reduced significantly, and the processability of CR/NR blends were improved. The photos of scanning electron microscopy (SEM) indicated that the compatibility of CR and NR could be improved by incorporating either chlorinated butyl rubber or cardanol into CR/NR blends. The curves of differential scanning calorimetry (DSC) showed that cardanol not only had better compatibilization effect than chlorinated butyl rubber, but also played the role of plasticizer. The mechanical properties show that with the increase of mass ratio of cardanol, the modulus of CR/NR blends decreased significantly and the elongation at break increased significantly.关键词：CR/NR blends;Compatibilizers;Curing properties;Mechanical properties
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发布时间：2022-09-09 - 摘要：The structure and component are the most important factors which influence the mechanical and chemical properties of materials. However, polymer materials are mainly composed of carbon, hydrogen and oxygen, so it is difficult to determine the structural information of the materials only by component analysis. Infrared spectroscopy and thermal analysis are two important methods to analyze the structural of polymer materials. However, the traditional infrared spectrum technology has high requirements on samples, so it is difficult to test samples directly without destroying the samples. Photo thermal induced infrared spectroscopy is used to characterize the sample surface without destroying the sample in this paper. At the same time, the thermal gravimetric-mass spectrum (TG-Ms) are also employed to analyze the structure of polymer materials which provides a new idea for the information analysis of polymer chain segments.关键词：Photo thermal induced infrared spectroscopy;Thermal gravimetic-mass spectrum;Polymer material;Structure
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发布时间：2022-09-09 - 摘要：Laser scanning confocal microscopy is an important research method for the analysis of internal structure of materials without complex experimental operation and prior sample destruction. It can give a three-dimensional image of the internal structure directly and is widely used in the research of biology, medicine, materials science and metallurgy, etc. This paper introduced the working principle and advantages of laser scanning confocal microscope. Moreover, the application progress in the field of polymer science was summarized, which includes polymer multi-component systems, polymer particles, polymer films, self-assembly of block copolymers, and controlled release of drugs, in order to provide useful reference for more scientific researchers.关键词：Laser scanning confocal microscopy;Polymer science;Application
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发布时间：2022-09-09 - 摘要：In order to achieve the goal of training polymer materials and engineering professionals in our school, that is, to cultivate high-quality engineering application-oriented talents, and to make up for the defects and deficiencies of practical operation in teaching, we have developed a virtual simulation experimental platform for the production of flexible polystyrene based on practical industrial production. The design and development ideas and concepts of the platform, the theme structure of the platform, and the design ideas and main contents of the experimental main control interface are described in detail. Practice has proved that the platform not only contains relevant knowledge of engineering application, but also greatly improves students' mastery and understanding of polymerization engineering and other related disciplines. Its successful application greatly enriched and expanded the students' engineering practice concept, and has excellent values of promotion and application.关键词：Expandable polystyrene;Virtual simulation experiment platform;Design and development
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发布时间：2022-09-09 - 摘要："Polymer Physics" is the core course for undergraduates majoring in polymer materials and engineering. The course contains all the physics knowledge of polymer and polymer as the object, and the contents are too many and complicated; Moreover, students are required to have good spatial imagination and abstract analysis ability. Therefore, students often find it difficult to grasp the key points and the learning effect is poor. This paper combining the characteristics of online teaching with the "drawing inferences about other cases from one instance" teaching mode, put forward the outcome-based education teaching mode, adopts the problem drive-free discussion-teaching-group discussion-co-eacher lecture-real-life case analysis, realize the Polymer Physics "target" of online teaching activities and the student’s high degree of "participation" , which can achieve the teaching purpose of profound and simple, that is helpful to improve students' learning interest and learning effect.关键词：Polymer Physics;Goal-problem orientation;Online teaching;Classroom interaction
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发布时间：2022-09-09 - 摘要：In the textbook of Polymer Chemistry (5th Edition) edited by Prof. Pan Zuren, for the unsealed system,the initial concentration of reactant was set as 1, when deriving the kinetic equation of reversible equilibrium linear polycondensation. Then, as the unit of initial concentration of reactant was ignored in the process of equation arrangement, inconsistence of parameters unit existed in the formula of polymerization degree,which was derived from kinetic equation. In order to solve the irrationality of the polymerization degree formula, the concentrations of reactants and products were set and retained in the equation arrangement process. Finally, by solving practical problems correctly, the accuracy the formula polymerization degree derived in this paper was proved.关键词：Polymer Chemistry;Unsealed system;Linear condensation polymer;Degree of polymerization
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发布时间：2022-09-09 - 摘要：Training high-quality application-oriented innovative talents is not only the requirement of engineering education certification in line with international standards, but also the demand of social development. Guided by the concept of engineering education certification, Changzhou University's polymer materials and engineering major has scientifically optimized the curriculum system, strengthened the construction of teaching staff, improved the teaching platform and curriculum platform, and promoted innovation and entrepreneurship education, which has comprehensively enhanced the cultivation of students' practical application ability and innovation ability, with remarkable results. It has been proved that these reforms play a significant role in training high-quality applied innovative talents.关键词：New era;Polymer materials and engineering;Talent training
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发布时间：2022-09-09 - 摘要：The course system is an important support for professional student training objectives and graduation requirements. In the work, the rationality of the curriculum system and make continuous improvement are determined with scientific methods, which has guiding significance for student training. The work takes the professional of polymer materials and engineering as an example, and demonstrates the relationship between the course system and graduation requirements from the perspective of the course standard of engineering education. The deficiencies of the curriculum system are analyzed by statistical analysis, which based on the direct evaluation of the course objectives and the indirect evaluation of graduates and company. A revised curriculum system is formed by taking the evaluation results as the basis for continuous improvement of the curriculum system. The work expects to provide a reference for the teaching process of course system revision from a quantifiable scientific aspect.关键词：Polymer materials and engineering;Course system;Continuous improvement;Evaluation results;Statistical analysis
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发布时间：2022-09-09 - 摘要：The capstone experience course has the feature of integration, exploration and autonomy, and has a active influence in improving the undergraduate teaching and the quality of personnel training. But there are also some problems at the micro-implementation level. This paper focus on the whole process of designing, implementing and evaluating capstone course, discussed the principles and general points that need to follow on every knot. In this paper, the capstone courses designed by the North University of China are used as a example to make a further step to demonstrate the key point such as project (or task) determination and selection, feature connotation, teaching process design, and course teaching evaluation of capstone course, so as to provide ideas and methods for building the "basic foundation" of capstone experience curriculum model.关键词：Capstone experience course;Curriculum design;Implementation;Evaluation
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发布时间：2022-09-09
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