最新刊期
      卷 16 ， 期 1 ， 2003
      • Zhi ZHENG,De-yu HANG,Yu-chuan* ZHANG,De-li RUAN
        Vol. 16, Issue 1, Pages: 1-7(2003) DOI: 10.14028/j.cnki.1003-3726.2003.01.001
        摘要：The study of properties and synthesis about ferroelectric liquid crystalline polymers (FLCP) has always been an important term of researches in these areas. This paper reviews the physical and chemical properties of FLCP,such as ferroelectricity,electro-optic effect,nonlinear optical properties,phase transition and synthesis of FLCP,and discusses the application prospect of FLCP in display device and nonlinear optical areas here.  
        关键词：Ferroelctric liquid crystal polymer (FLCP);Ferroelectricity;Electro-optic effect;Nonlinear optic (NLO);Phase transition   
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        发布时间：2022-09-18
      • Ke-jian WANG,Chi-xing ZHOU
        Vol. 16, Issue 1, Pages: 8-17(2003) DOI: 10.14028/j.cnki.1003-3726.2003.01.002
        摘要：This paper sums the study results on wall slip of polymer melt in shear flow,which leads to the physical meaning of the developed Z-W model. In the model,it was realized that there was interfacial layer at the wall,real wall slip occurred at the wall interface through adsorbing-desorbing; apparent slip occurred in interfacial layer through disentanglement-reentanglement. On the other hand,the interfacial molecules were confined with different dynamics with that of internal melt; there is elastic tension between bulk chains and interfacial ones. Z-W model reduces to one second order differential equation in simple shear flow. This model first quantitatively shows general wall slip contains adhesive slip and cohesive slip as well as elastic deformation slip. The self-oscillation in capillary extrusion was reviewed. It was frist time to propose the definitions of multiple internal self-oscillation and multiple external self-oscillation. The simplified Z-W model qualitativedly explained such nonlinear flow phenomena as the non-linearity of shear stress ,the transient self-oscillation in pressure ,the stick-slip transtition and sharkskin features in capillary rheometry. The Z-W model was reduced to a Duffing equation to show linearity in small amplitude oscillatory shear and complex nonlinearity at large amplitude. The complexity changes with viscoelaticty of polymer melt and vibration amplitude or frequency. The Z-W model also reduces to the published Josh'is model,dynamical network model or the model by Hatzikirizkos and the model by Graham under special conditions. In all,Z-W model was abundant in usage with certain rationality.  
        关键词：Polymer melt;Wall slip;Self-oscillation;Oscillatory shear;Z-W model   
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        发布时间：2022-09-18
      • Li CHEN,Xi-guang DU,Bao-zhong ZHAO,Xia-bin JING,Xue-si CHEN
        Vol. 16, Issue 1, Pages: 18-24,52(2003) DOI: 10.14028/j.cnki.1003-3726.2003.01.003
        摘要：This review focuses on the recent studies and development of the preparations of polyglycolide (PGA) and ester-ester and ester-ether copolymers,of the biodegradability,the biocompatibility and the mechanical properties of the bio-polymers. The medical applications of those biodegradable materials and prospects of polyglycolide are also discussed.  
        关键词：Polyglycolic acid;Glycolide copolymers;Ring opening polymerization;Biodegradable polymer;Medical application   
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        发布时间：2022-09-18
      • Xiao-ling GAO,Qiang FU,G. Strobl
        Vol. 16, Issue 1, Pages: 25-33(2003) DOI: 10.14028/j.cnki.1003-3726.2003.01.004
        摘要：How polymers crystallize? This question stands for long time and argues for many years. Over the years various conceptual models have been proposed and work out. Among them,nucleation and growth theory,which developed by Hoffman and Lauritzen,is now widely used and dominant in the data treatment. However the recent results show that the formation and growth of lamellar cyrstallites is a multi-step process passing over intermediate states. This new development and new models are summarized in this paper. The novel model developed by Prof. Strobl is favorably induced. It is proposed that the initial step is always the creation of mesomorphic layer which spontaneously thickens,up to critical value,where it solidifies through a cooperative structural transition. The transition produces a granular crystalline layer,which transforms in the last step into homogeneous lamellar crystallites.  
        关键词：Polymer crystallization;Intermediate phase;Model   
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        发布时间：2022-09-18
      • Shao-bo XIE,Shi-min ZHANG
        Vol. 16, Issue 1, Pages: 34-42(2003) DOI: 10.14028/j.cnki.1003-3726.2003.01.005
        摘要：Polypropylene/layered silicates nanocomposites are reviewed. The nanocomposites can be prepared by monomer in-situ intercalative polymerization,polymer solution intercalation and polymer melt intercalation. There are intercalated and exfoliated microstructures in the nanocomposites,differing from conventional filled composites. These nanocomposites show enhanced mechanical,thermal,barrier and rheological properties. Because of nonpolarity in polypropylene and its particular process,this has aroused some theory researchers’ interests.  
        关键词：Layered silicate;Polypropylene;Nanocomposites   
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        发布时间：2022-09-18
      • Hui PENG,Yan-hua SHEN,Yong KE,Shi-yuan CHENG
        Vol. 16, Issue 1, Pages: 43-52(2003) DOI: 10.14028/j.cnki.1003-3726.2003.01.006
        摘要：Controlled/living radical polymerizations carried out in the presence of water have been examined. These aqueous systems include both the homogeneous and the various heterogeneous,namely dispersion, suspension,emulsion and miniemulsion,Among them,the most common methods allowing control of the radical polymerization,such as nitroxide-mediated polymerization,atom transfer radical polymerization and reversible addition-fragmentation transfer,are presented in detail. Good prospects for controlled/living radical polymerization in aqueous media are also shown.  
        关键词：Aqueous solution;Controlled/living radical polymerization;Nitroxide;Atom transfer radical polymerization;Reversible addition-fragmentation transfer   
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        发布时间：2022-09-18
      • Li QI,Guang-ji Li
        Vol. 16, Issue 1, Pages: 53-58(2003) DOI: 10.14028/j.cnki.1003-3726.2003.01.007
        摘要：Application of biocatalyst enzyme in polymer modification and synthesis has been a new focus in science research. Compared to usual chemical way,biocatalysis is more prospective in polymer industry for its high efficiency,high selectivity and mild reaction conditions. The development of biocatalysis in polymer modification in recent years is summerized in this paper.  
        关键词：Biocatalysis;Enzyme;Polymer modification   
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        发布时间：2022-09-18
      • Yi-wu QUAN,Qing-min CHEN
        Vol. 16, Issue 1, Pages: 59-62,70(2003) DOI: 10.14028/j.cnki.1003-3726.2003.01.008
        摘要：This paper reviewed structure and behavior of the polyurethane (urea) containing polybutadiene. The factors influencing behavior and the methods of modification are discussed,also the material application are introduced.  
        关键词：Hydroxyl-terminated polybutadiene;Polyurethane (urea);Structure and bulk;Modification;Application   
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        发布时间：2022-09-18
      • Jie HU,Bai-ling LIU,Di-qiang WANG
        Vol. 16, Issue 1, Pages: 63-70(2003) DOI: 10.14028/j.cnki.1003-3726.2003.01.009
        摘要：Based on their unique structures fluoropolymers are provided with high thermal,chemical and weather resistance. They also possess the prominent electrical and optical properties,as well as excellent surface properties,etc. For fluoropolymers take the advantages of both high performance and low (or no) pollution,they have become one of ideal coatings used in many fields. This paper mainly introduces several kinds of fluorinecontaining coatings,such as polyvinylidene fluoride,fluoro-olefine vinyl ether copolymer,polytetrafluorothylene and perfluoropolyether. The attention is paid on the relationship between their structures and properties. The developing tendency of fluoropolymers is also presented here.  
        关键词：Fluoropolymers;Structure and properties;Environment-friendly materials;Coatings   
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        发布时间：2022-09-18
      • Dong-jie JIN,Zhi-meng LIU,Cheng-yong HA
        Vol. 16, Issue 1, Pages: 71-77(2003) DOI: 10.14028/j.cnki.1003-3726.2003.01.010
        摘要：The research history of aqueous polyurethane dispersions modified with polyacrylic emusions has been reviewed and the way of preparation of the polyurethane-polyacrylic dispersions has been described in detail ,including mechanical mixture of polyurethane (PU) and polyacrylate (PA) ,latex copolymerization,graft copolymerization,interpenetrating networks and core-shell copolymerization of PU and PA. And the range and foreground of applications of each one are discussed in this paper.  
        关键词：Aqueous;Modification;Polyurethane-polyacrylic dispersions;Development;Synthesis   
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        发布时间：2022-09-18
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