最新刊期
      卷 33 ， 期 2 ， 2020
      • Wei ZHANG,Peng LI,Hong ZHU,Mi-qiu KONG,Ya-jiang HUANG,Guang-xian LI
        Vol. 33, Issue 2, Pages: 1-7(2020) DOI: 10.14028/j.cnki.1003-3726.2020.02.001
        摘要：Polylactide (PLA) is completely renewable, biodegradable and good biocompatibility, which has a great potential in the application of tableware, packaging, spinning, biomedical devices and 3D printing. However, the melt strength of PLA is extremely low, leading to its bad processing properties in the extensional flow based processing methods, such as foaming, melt spinning, film blowing, thermal forming, and so on. Thus, the improvement of the melt strength of PLA is important for extensional flow based processing methods. This paper reviews recent progress on PLA with high melt strength, including copolymerization, chain extender, reactive extrusion, the addition of nanoparticles.  
        关键词：Polylactide;Melt strength;Molecular structure;Nanoparticles   
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        发布时间：2022-08-31
      • Wei-li WU,Feng-yu CHEN,Zhe CHEN
        Vol. 33, Issue 2, Pages: 8-12(2020) DOI: 10.14028/j.cnki.1003-3726.2020.02.002
        摘要：Diatomite is a kind of siliceous sedimentary rocks formed by remains of single-celled algae under natural conditions, which is widely used in chemical, petroleum, building materials, biological medicine and health care and environmental protection, and many other fields because of its light weight, large specific surface area, strong adsorption, sound insulation, wear resistance, heat resistance, and corrosion resistance characteristics etc. However, due to the similar structure and composition of diatomite and silica, the silica is usually used as rubber reinforcing filler, at present, the research on the application of diatomite in rubber reinforcing filler is seldom reported. In the present paper, the properties of diatomite, research status at home and abroad, the modification of diatomite and the preparation process of diatomite reinforced rubber composites was summarized. And the development trend of diatomite reinforced rubber composites was previewed.  
        关键词：Diatomite;Rubber;Composite materials;Research status;Progress   
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        发布时间：2022-08-31
      • Dong-xue PENG,Qian LIU
        Vol. 33, Issue 2, Pages: 13-22(2020) DOI: 10.14028/j.cnki.1003-3726.2020.02.003
        摘要：As a new type of electroactive polymer, dielectric elastomer can be deformed when excited by an electric field, and can be restored to its original state when the electric field is cancelled. It has the characteristic of converting electrical energy directly into mechanical energy. By designing them as actuators with different configurations, it is possible to increase the deformability and meet different application requirements. In this paper, the actuation mechanism of dielectric elastomer actuators is introduced, and it is clarified that they are linear actuators capable of generating motion in a straight line manner. On this basis, actuators of different configurations can be designed. Dielectric elastomer actuators with different structure designs are summarized, and their performance characteristics, processing technology and potential applications are discussed.  
        关键词：Dielectric elastomer;Actuator;Structural design;Electro-deformation   
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        发布时间：2022-08-31
      • Zhi-ping FAN,Ping CHENG,Zhuang DING,Yan-na ZHAO,Jun LI,Min LIU,Praka-sh SANGEETA,De-meng ZHANG,Wen-li WANG,Zheng-ping WANG,Jun HAN
        Vol. 33, Issue 2, Pages: 23-37(2020) DOI: 10.14028/j.cnki.1003-3726.2020.02.004
        摘要：Biomaterials are the cornerstone to promote the rapid changes in the field of biomedicine. Biohydrogel, as an important member, has shown a vigorous development trend in recent years. A new injectable poly(γ-glutamic) acid (PGA)/hyaluronic acid (HA) composite hydrogel crosslinked by biocompatible method was introduced in this study. Firstly, the PGA-Ty precursor and the HA-CA precursor were synthesized by EDC/NHS protocol. The structures of both precursors were confirmed by nuclear magnetic resonance (NMR) and infrared spectroscopy (IR). The two precursors were crosslinked in aqueous phase under the combined action of low concentration hydrogen peroxide (10 mM) and horseradish peroxidase (HRP, 10U·mL-1) to obtain interpenetrating network (IPN) hydrogels. The properties of series IPN hydrogels, such as equilibrium water content, morphology, enzymatic degradation profile and mechanical properties were tested. Mechanical strength of I3 and I3' hydrogels were 8113Pa and 9629Pa, respectively. Equilibrium water content could be varied from 13.3~21. Porous scaffolds, whose pore size of internal structure was in the range of 10~100μm, could be obtained after IPN hydrogel be lyophilized. The drug release behavior and antibacterial effect in vitro were evaluated by using tetracycline hydrochloride as a drug model. Under physiological conditions, both of the drug loaded hydrogels showed regular drug release profiles and a certain pH sensitivity. After 5 days release, the cumulative release rate of the drug was 77.74%, while the drug loaded hydrogel in acidic environment had released 92%. The cytotoxicity of gel materials and the effect of cell 3D culture showed that its biocompatibility was good. The cells embedded in vitro did not show obvious cytotoxicity through 72h culture. Series of data show that these IPN hydrogels can be designed as a pHsensitive drug delivery carrier. And because of its good biocompatibility, it also has potential as a cell scaffold, trauma excipient or other biomedical materials.  
        关键词：Biomedical hydrogel;Interpenetrating network hydrogel;pH-Sensitive;Antibacterial;Cell 3D culture   
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        发布时间：2022-08-31
      • Hui-xian YAN,Heng-di SU,Wei LIN
        Vol. 33, Issue 2, Pages: 38-46(2020) DOI: 10.14028/j.cnki.1003-3726.2020.02.005
        摘要：The dielectric elastomer will deform under the action of electric field. Strong electric field should be applied to the dielectric elastomer to obtain high deformation energy, which may lead to electric-mechanical instability. In this paper, the electric-mechanical coupling behavior of photo-thermal sensitive dielectric gel was studied. Based on the theory of thermodynamics and continuum mechanics, the electric-mechanical coupling deformation theory of photo-thermal sensitive dielectric gel was established, the effects of temperature, light intensity and pretension on the electric-mechanical coupling deformation behavior of photo-thermal sensitive dielectric gel were studied. The results show that: In the absence of pretension, the electric-mechanical instability will occur finally with the increase of electric field intensity, and the smaller the light intensity and the lower the temperature is, the higher the critical electric intension is; Pretension can improve the electric-mechanical stability of photo-thermal sensitive dielectric gel. With equal biaxial pre-stretching, the extension rate in the direction of gel thickness decreases significantly, the nominal electric field strength increases linearly with the increase of nominal electric field.  
        关键词：Photo-thermal sensitive;Dielectric gel;Coupling behavior;Prestretching;Electric-mechanical instability   
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        发布时间：2022-08-31
      • Shan-quan JIANG,Xiao-hong DENG,Qiang LI,Li-xin LING,Xiang-wei SUN
        Vol. 33, Issue 2, Pages: 47-53(2020) DOI: 10.14028/j.cnki.1003-3726.2020.02.006
        摘要：In this paper, MAA,NIPAAm,AM as monomer,γ-Fe2O3 as enhancers and MBA as crosslinking agent, semi-interpenetrating(semi-IPN) hydrogels PMAA/PAM-NIPAAm/γ-Fe2O3 was prepared, by solution polymerization on 50℃. The swelling behavior, thermal properties and, magnetic properties were investigated. The test results showed that the hydrogels formed a stable IPN interpenetrating network structure and exhibited temperature sensitivity, pH sensitivity and paramagnetism. Below 31℃ the swelling ratios of the semi-IPN hydrogels increased with increasing of temperature, but above 31℃, the temperature sensitivity of the semi-IPN hydrogels slight decreased with increasing of temperature. However, the thermal shrinkage of NIPAAm hydrogels is successfully overcome.  
        关键词：γ-Fe2O3;Semi-IPN;Temperature sensitivity;pH sensitivity   
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        发布时间：2022-08-31
      • Xiao-xin WANG,Zhao-ge HUANG,Shi-bao WEN
        Vol. 33, Issue 2, Pages: 54-58(2020) DOI: 10.14028/j.cnki.1003-3726.2020.02.007
        摘要：The introduction of advanced CIDO engineering education mode in the training process of engineering students plays an important role in training students' practical and innovative abilities. Based on the analysis of the teaching characteristics of the course Plastic Products Design, this paper introduces the CAE/CAE technology into the course teaching, and makes a useful exploration. It is not only of great significance to improve the teaching effect of the course, but also promotes students to learn and apply the CAD/CAE software. On this basis, the rapid development of 3D printing technology is applied to the course teaching, which helps students to understand advanced technology, stimulate students' interest in learning and improve students’ innovative ability.  
        关键词：CAD/CAE;3D printing;Plastic products design;Course teaching   
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        发布时间：2022-08-31
      • Shan JIANG,Hong-wen ZHANG,Yan YANG,Guo-yu WANG
        Vol. 33, Issue 2, Pages: 59-64(2020) DOI: 10.14028/j.cnki.1003-3726.2020.02.008
        摘要：Combining with teaching practice of polymer material and engineering major, the actual situation and existing problems of the production practice teaching were analyzed, and the reform for production practice was implemented. A new production practice mode composed of both the production practice in and out of the school was proposed, and the construction of practice teaching platform in school was focused. Thus the problem that the content of production practice updates slowly and is also lack of cutting edge forming technique can be solved. The school practice base construction is composed of construction of system safeguard, development of teachers’ team and the information platform construction. Students passionately participate in the production practice, and behaved pretty well in various innovation entrepreneurship competition, the graduate examination and the employment, which proved that good results have been obtained in our reform, and the students are equipped with engineering practice and creative ability.  
        关键词：Polymer material and engineering;Production practice;School practice base   
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        发布时间：2022-08-31
      • Cui-qing TENG
        Vol. 33, Issue 2, Pages: 65-68(2020) DOI: 10.14028/j.cnki.1003-3726.2020.02.009
        摘要：Implementing ideological and political construction in specialized courses in universities is an important issue of achieving cultivation in higher education for everyone, every process and every perspective. This report summarizes the implementation methods and teaching experience of introducing ideological and political construction into the teaching practice of "Composite Materials Science" . The effectiveness of ideological and political education have proved that both the professional education and ideological and political education are developed simultaneously by means of bringing the teachers' role into full play, adopting various teaching methods, as well as closely integrating the ideological and political construction with composite materials knowledge and university subject expertise. In this way, the students' learning passion can be fully aroused, their "three outlooks on life" can be set up appropriately, their sense of national pride and patriotic spirits can be increased, and the great ambition of paying back their motherland and putting it into practice can be easily established among students.  
        关键词：Ideological and political construction;Composite materials;Course design;Teaching method   
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        发布时间：2022-08-31
      • De-hai WANG
        Vol. 33, Issue 2, Pages: 69-71(2020) DOI: 10.14028/j.cnki.1003-3726.2020.02.010
        摘要：Polymer structure is an important material basis for its properties. A reasonable division of the structure of polymer materials is helpful to understand the relationship between structure and properties of polymer in polymer physics course. The classification of polymer structure should not only consider the spatial stacking characteristics of specific particles in static state, but also consider the basic units of structural movement or change of polymer. According to the particle size,the structure of polymers can be divided into single polymer structure (chain structure), aggregated state of homopolymers (condensation structure) and aggregated state of multiple polymers (texture structure). Among them, the structural form determined by the chemical bond factor includes the relative molecular mass and equivalent isomers such as constitution and configuration. The structure levels determined by physical factors are the stacking and arrangement of local particles in space, and the chain segments are the most important moving (changing) units, although they are often ignored.  
        关键词：Polymer;Structure;Teaching   
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        发布时间：2022-08-31
      • Bai-jun LIU,Guang-feng WU,Ming-yao ZHANG,Hui-xuan ZHANG
        Vol. 33, Issue 2, Pages: 72-75(2020) DOI: 10.14028/j.cnki.1003-3726.2020.02.011
        摘要：As the development of polymer technology, polymer chemistry has become the compulsory course of chemistry, chemical engineering and material majors. In addition to these majors, many science majors also selected polymer chemistry as one of elective courses. It is very difficult to learn for many students due to the complexity of concept. During the teaching of polymer chemistry course, authors used many new teaching models such as "analogy teaching" , "object teaching" , "flipped teaching" and "formula teaching" to improve the knowledge understandings for students. The applications of these teaching also help student enhance the learning capability.  
        关键词：Polymer Chemistry;Analogy teaching;Object teaching;Flipped teaching;Formula teaching   
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        发布时间：2022-08-31
      • Wei-yi CUI
        Vol. 33, Issue 2, Pages: 76-80(2020) DOI: 10.14028/j.cnki.1003-3726.2020.02.012
        摘要：Polymerization reaction engineering is a course with strong engineering practicality. Based on the concept of core literacy cultivation, this course carries on the exploration of teaching reform, and implements the cultivation of core literacy of college students into the course teaching. Focusing on emphasizing practical application ability and strengthening the cultivation of Engineering consciousness, students should be trained to integrate knowledge of various disciplines and form a complete knowledge system; cooperate with off-campus practice platform to enhance students social adaptability, practical application ability and innovative consciousness; and deepen the reform of curriculum teaching evaluation mechanism. Through the integration of core literacy and existing curriculum system, this paper explores the teaching reform strategy of polymer reaction engineering course under core literacy.  
        关键词：Polymerization reaction engineering;Core literacy;Teaching reform   
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        发布时间：2022-08-31
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