最新刊期
      卷 20 ， 期 9 ， 2007
      • De-wan XIA,Qiang ZHANG,Yan-qiao SHI,Yun ZHAO,Qing-ze JIAO,Guan-wen CHEN
        Vol. 20, Issue 9, Pages: 1-8(2007) DOI: 10.14028/j.cnki.1003-3726.2007.09.009
        摘要：Pervaporation is one of the most active research areas in membrane science. It is an important component for chemical separations and has attached great attentions. In this paper,based on three main mixture systems viz. ,dehydration of organic solvents,separation of organics form aqueous solution,separation of organicorganic mixtures,the recent development in pervaporation is reviewed,respectively. Separation of organic-organic mixtures by pervaporation is discussed with emphasis on the following aspects: polar/non-polar mixtures,aromatic/ aliphatic mixtures,aromatic/alicyclic mixtures,isomers,multi-mixtures and desulfurization of gasoline. Finally,the advancement of further research and development about pervaporation are prospected.  
        关键词：Pervaporation;Membrane;Separation   
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        发布时间：2022-09-18
      • Zheng-hong LUO,Teng-yun HE,Cun-guo LIN,Li-zong DAI
        Vol. 20, Issue 9, Pages: 9-14(2007) DOI: 10.14028/j.cnki.1003-3726.2007.09.002
        摘要：The low-surface-energy polymers are important for materials with low-surface-energy. They play an important part in many areas especially in coatings due to its special performances. Up to now,the polymers with lowsurface- energy mainly includes fluorocarbons,organosiloxane and fluorosilicone . The latest synthesis researches on these polymers are quite active and are briefly presented in this paper on the basis of polymerization mechanism, which mainly contains group transfer,cationic polymerization,anionic polymerization,free-radical polymerization and reactions between living functional groups.  
        关键词：Low-surface-energy polymers;Contact angle;Polymerization mechanism   
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        发布时间：2022-09-18
      • An-long LI,Hui LIANG,Jiang LU
        Vol. 20, Issue 9, Pages: 15-22(2007) DOI: 10.14028/j.cnki.1003-3726.2007.09.003
        摘要：Reversible addition-fragmentation chain transfer (RAFT)polymerization is one of the techniques employed to obtain living controlled radical polymerization .Due to the compatibility with a wide range of monomers and reaction conditions, the RAFT process appears considerably more versatile than other living or controlled radical polymerization process .Therefore RAFT radical polymerization has been studied extensively .This review highlights the progress in RAFT radical copolymerization since its first report in 1998.It gives an account of the monomer pairs that have been copolymerized to date, and addresses the influence of the RAFT process on the copolymer composition .  
        关键词：Reversible addition-fragmentation chain transfer;Copolymerization;Controlled living radical polymerization   
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        发布时间：2022-09-18
      • Li-wei LI,Yan-ling LUO,Li NIU
        Vol. 20, Issue 9, Pages: 23-30(2007) DOI: 10.14028/j.cnki.1003-3726.2007.09.008
        摘要：The polymer based conductive composites has developed as a novel functional composite material recently .The gas sensitive responsive mechanism of polymer based conductive composites doped with carbon black (CB)are discussed in the present paper, such as volume expanding model, crystalline model and hydrogen-bond model .At the same time, we discuss the influence of various factors, such as percolation value, structure and properties of CB and polymers, and interaction among CB, polymer and organic odor etc on gas sensitive responsiveness of the composites .  
        关键词：Polymer;Carbon black;Electro-conductive composite;Gas characteristic;Sensitive mechanism   
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        发布时间：2022-09-18
      • Shuang WU
        Vol. 20, Issue 9, Pages: 31-38(2007) DOI: 10.14028/j.cnki.1003-3726.2007.09.004
        摘要：Thermosensitive polymers applying in drug preparations have been greatly increasing effectiveness and safety of drugs due to their enhanced continuity and specificity in drug-delivery,since they can release or break off drug component depending on the self-feedback signal that is induced in response to environmental temperature. Thermosensitive polyphosphazenes that are a novel material with good biodegradability and excellent biocompatibility have attracted considerable attention recently because of their promising potential applications in the development of drug delivery systems. In this article thermosensitivity and biodegradability of polyphosphazenes are reviewed. The influence of LCST of polyphosphazenes and their applications in drug delivery systems are also discussed.  
        关键词：Polyphosphazenes;Thermosensitivity;Biodegradation;Low critical solution temperature;Drugdelivery   
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        发布时间：2022-09-18
      • Chun-yan WANG,Dong-wei WEI,Fu-sheng LI
        Vol. 20, Issue 9, Pages: 39-44(2007) DOI: 10.14028/j.cnki.1003-3726.2007.09.001
        摘要：The research on reaction kinetic model of polycarbonate by melt transesterification of bispheno-l A with diphenyl carbonate was summarized in this text. Two successful models,the functional group model and the molecular species model were explained in detail. A new tetrahedral intermediate model was also introduced. The calculating results of kinetic equations that educed from different models were discussed and compared with the experimental data. The reactive order,activation energies,rate constants and equilibrium constants can be gained via the functional group model. The most prominent advantage of the molecular species model was the concentration of materiel can be tracked at any moment,so the distribution of molecular weight and average molecular weight can be figured out sequentially. The applicability of the tetrahedral intermediate model was justified by fitting it to the available experimental data. Several amendatory aspects about further research on kinetics were also mentioned.  
        关键词：Bispheno-l A;Diphenyl carbonate;Polycarbonate;Transesterification;Kinetics   
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        发布时间：2022-09-18
      • Zai-feng LI,Wei YUAN,Jin-yan LI,Tao XU,Min-xuan WANG
        Vol. 20, Issue 9, Pages: 45-51(2007) DOI: 10.14028/j.cnki.1003-3726.2007.09.005
        摘要：In this paper,the effects of structure of polyurethane and the mixture of other materials with polyurethane on the heat-resistance of polyurethane elastomers were reviewed. The introduction of rigid groups,the structure of hard segment and soft segment all can improve the thermal stability of polyurethane. Both the mixture of inorganic materials,organic materials with polyurethane and the interpenetrating polymer networks can reinforce the heat-resistance of polyurethane.  
        关键词：Polyurethane;Elastomer;Heat-resistance   
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        发布时间：2022-09-18
      • Jian-jun XIE,Xin-rong LIU,Ji-fu LIANG,Sai LIU
        Vol. 20, Issue 9, Pages: 52-58(2007) DOI: 10.14028/j.cnki.1003-3726.2007.09.010
        摘要：The water-absorbing resin or high elastic gel is a type of new functional polymer materials. It has excellent absorbency and water-retention properties,and is widely used in the personal care and hygienic products, etc. but is hardly applied in the adsorption and separation materials. Based on the introduction to the basis types and their major characters,the affecting factors of the absorbency for the water-absorbing resin,the structure and its behavior,the adsorption behavior for heavy metal ions,the coordinating atoms or groups and ligand-ligand interaction,the affecting factors of adsorption process for the water-absorbing resin are reviewed. And then a few proposes are presented for application of adsorption for the water-absorbing resin.  
        关键词：Water-absorbing resin;Adsorption and separation;Heavy metal ions;Superabsorbent;Review   
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        发布时间：2022-09-18
      • Ping-ping ZHU,Ping-sheng HE,Hai-yang YANG
        Vol. 20, Issue 9, Pages: 59-61(2007) DOI: 10.14028/j.cnki.1003-3726.2007.09.006
        摘要：In order to give a thorough exposition to basic concepts in course of " Polymer Physics" ,the method of discrimination between concepts with similar meaning was introduced.  
        关键词：The structure and properties of polymers;Polymer physics;Discrimination   
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        发布时间：2022-09-18
      • Li-hua ZHANG,Su ZHANG,Xiang-mei WANG,Cun-dong WANG
        Vol. 20, Issue 9, Pages: 62-65(2007) DOI: 10.14028/j.cnki.1003-3726.2007.09.007
        摘要：The structure,contents and make-tools of a polymer physics network courseware developed by author are introduced in this paper. The creating emphasis of this courseware is the art designing and navigation of Web pages. This courseware can be a helpful tool for students to learn and for teachers to instruct the course of polymer physics.  
        关键词：Network courseware;Polymer physics;Web-page navigation   
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        发布时间：2022-09-18
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