最新刊期
      卷 21 ， 期 1 ， 2008
      • Jian-hua DONG
        Vol. 21, Issue 1, Pages: 1-6(2008) DOI: 10.14028/j.cnki.1003-3726.2008.01.001
        摘要：The funding programs in polymer science of National Natural Science Foundation of China in recent years were introduced in the first part.Several suggestions for preparing proposals have been given and the guidance for grants in 2008 fiscal year in division of polymer science was released.The strategic meetings on the discipline development have been summarized.  
        关键词：Polymer science;Funding programs;Guidance for grants   
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        发布时间：2022-09-18
      • Hu YANG,Rong-shi CHENG
        Vol. 21, Issue 1, Pages: 7-15(2008) DOI: 10.14028/j.cnki.1003-3726.2008.01.003
        摘要：PVA-iodine complexes could be formed in kI-iodine aqueous solution, which materials have been already applied widely in daily life. In this paper, the formation of PVA-iodine complexes in dilute aqueous solution has been reviewed. The effects of the degree of polymerization, stereo-regularity, 1, 2 glycol content, concentration of PVA, additional reagents and reaction time on the color development due to PVA-iodine complexes have been studied. From the viewpoint of aggregation mode, the structure of iodine in the complexes is linear polyiodine ions such as I3- and I5-, whereas PVA chains are readily to aggregate by intermolecular hydrogen bonding, and each polyiodine is surrounded by some parallelly-oriented PVA chains to form complexes.  
        关键词：Poly(vinyl alcohol)(PVA);PVA-iodine complexes;Aggregation model   
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        发布时间：2022-09-18
      • Ying-li SUN,Wei-hong QIAO,Hong-zhu LIU,Zong-shi LI
        Vol. 21, Issue 1, Pages: 16-23(2008) DOI: 10.14028/j.cnki.1003-3726.2008.01.004
        摘要：To use polymerizable emulsifier can solve the deficiency of traditional emulsifier and enhance the application functions of emulsion.The maleic emulsifier can make a firmer bond on latex surface because of its moderate reactivity.Furthermore,this kind of emulsifier can undergo copolymerization with comonomers,but cannot be homopolymerised.As a result,the application of maleic emulsifier in emulsion polymerization can meliorate the capability of emulsion along with water resistance of latex film.As a new type of emulsifier,Maleic polymerizable was introduced in the paper and it was classified according to the different kinds of hydrophilic groups.Besides,the features of maleic polymerizable emulsifier and various types of synthesis routes were summarized. Their applications in different polymerizable systems and progress were described as well.  
        关键词：Maleic polymerizable emulsifier;Classification;Emulsion polymerization systems   
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        发布时间：2022-09-18
      • Yang HE,Rui HUANG,De ZHENG
        Vol. 21, Issue 1, Pages: 24-32(2008) DOI: 10.14028/j.cnki.1003-3726.2008.01.005
        摘要：β form polypropylene (β-PP)has been a hot topic in modification-PP because of its excellent mechanical properties, forming microhole in drawing and other special properties. This paper reviewsthe development advances in β-PP in recent years. It simply describes four methods of making β-PP, focus on the way of β nucleating agent inducing β form in PP; the history, sorts, efficiency and nucleating mechanism of β nucleating agent; different supermolecular structures of β-PP: β-spherulite, hedrite, β-Transcrystallinity, β-cylindrite; β→α phase transformation and mechanism; the effect of temperature, shearing, annealing, hot history and processing condition on the β-PP, It provide information for producing high content β form polypropylene. Trends in research of nucleating agents are also presented.  
        关键词：Polypropylene;Nucleating agent;β Form   
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        发布时间：2022-09-18
      • De-cheng WAN,Qing ZHOU
        Vol. 21, Issue 1, Pages: 33-40(2008) DOI: 10.14028/j.cnki.1003-3726.2008.01.002
        摘要：Living radical polymerization has developed over the past decade into an effective means for macromolecular design. The representative processes are nitroxide-mediated polymerization (NMP), atom transfer radical polymerization (ATRP) and reversible addition-fragmentation chain transfer (RAFT) polymerization or macromolecular design via interchange of xanthate (MADIX).These techniques have been successfully applied to conjugated monomers, but less successfully to unconjugated ones. This review summarizes living radical polymerization techniques that are successfully applied to unconjugated monomers, where mainly RAFT MADIX systems, some ATRP systems, iodine degenerative transfer system and the newly developed organotellurium-mediated radical polymerization (TERP), organostibine-mediated radical polymerization (SBRP)are available, among which, the uniqueness of TERP and SBRP is worth notice.  
        关键词：Unconjugated monomer;Living radical polymerization;Polymer   
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        发布时间：2022-09-18
      • Xin DENG,Du-xin LI,Jun YANG,Jing WANG
        Vol. 21, Issue 1, Pages: 41-46(2008) DOI: 10.14028/j.cnki.1003—3726.2008.01.009
        摘要：The development of research on friction and wear of high performance and high temperature polymer composites were introduced in this paper,including polytetrafluoroethylene (PTFE) ,poly (ether ether ketone) (PEEK) ,polyphenylenesulphide (PPS) ,polyimide (PI). The effects of different fillers on friction coefficient and wear rate of polymer composites were discussed,such as fibers,solid lubricant,inorganic compound and nanoparticles. The results show that the fillers can improve tribological properties of polymer.And the interaction effect of different fillers can effectively reduce friction coefficient and wear rate of the composites.  
        关键词：High performance;High temperature polymer composites;Friction;Wear   
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        发布时间：2022-09-18
      • Yin-long YANG,Ru-ke BAI
        Vol. 21, Issue 1, Pages: 47-53(2008) DOI: 10.14028/j.cnki.1003-3726.2008.01.007
        摘要：Metallo-supramolecular polymers are new functional polymers that are composed of monomeric units held together by kinetically stable metal-ligand interactions.The supramolecular polymers have varieties of geometric architectures and topologic structures,such as linear,grafted,networked,dendritic polymers,etc,and possess useful properties such as optical,electronic,and magnetic property,which are expected to have potential applications in many fields such as biomedicine,molecular devices,nanomaterials science,catalysis and hydrogen storage. Herein,we briefly review the progress in metallo-supramolecular polymers containing pyridine groups in recent years.  
        关键词：Metal coordination;Metallo-supramolecular polymer;Self-assembly;Pyridine group   
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        发布时间：2022-09-18
      • Bin WANG,La-mei HU,Yong-zhong WU,Jun-hua ZHANG
        Vol. 21, Issue 1, Pages: 54-60(2008) DOI: 10.14028/j.cnki.1003—3726.2008.01.008
        摘要：In this paper authors summarized the living/controllable free radical polymerization methods of vinyl acetate (VAc). Vinyl acetate is an important monomer for producing polyvinyl acetate and polyvinyl alcohol. Traditional free radical polymerization methods such as solvent,emulsion,suspension and dispersion polymerization can be adopted for vinyl acetate polymerization and getting different molecular weight distribution.However,it’s difficult to get narrower molecular weight distribution for the high active radical of VAc.In recent years,living/ controllable free radical polymerization methods have been widely developed,and some of them have been successfully used for the VAc polymerization.In this article,the progresses are addressed.  
        关键词：Vinyl acetate;Polymerization;Living/controlled   
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        发布时间：2022-09-18
      • Su-fang Lü,Mei-jiang LI,Ji-rong WU,Jian-xiong JIANG,Guo-qiao LAI,Hua-yu QIU
        Vol. 21, Issue 1, Pages: 61-67(2008) DOI: 10.14028/j.cnki.1003-3726.2008.01.006
        摘要：Cyclosiloxanes are converted into linear polysiloxane by the action of nucleophilic or electrophilic catalyst, temperature and radiation. The polymerization method is bulk polymerization and emulsion polymerization. Bulk polymerization can be divided into anionic polymerization and cationic polymerization. Anionic polymerization is that cyclosiloxanes are converted into linear polysiloxane by basic catalyst (nucleophilic agent ).Cationic polymerization process is performed by acidic catalyst (electrophilic agent).Emulsion polymerization is polymerized by monomer, water (or other disperse medium)and emulsifying agent. According to emulsifying agent type, emulsion polymerization can also be mainly divided into anionic and cationic type. This review introduces the study on mechanism and kinetics for ring-opening polymerization of bulk polymerization and emulsion polymerization of cyclosiloxane, and at last analyzes the developing trends.  
        关键词：Cyclosiloxane;Anionic polymerization;Cationic polymerization;Mechanism;Kinetics   
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        发布时间：2022-09-18
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