最新刊期
      卷 12 ， 期 3 ， 1999
      • Xinde Feng
        Vol. 12, Issue 3, Pages: 1-9(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.001
        摘要：The chief three characteristics of the 21st century are energy,material and health/environment (Green factor) in which the former two factors should follow the demands of the Green factor.Polymer will serve as the chief material to save energy consumption and be more (in quality and quantity) in demand for our modern social needs.The preview will consist of two main themes:1.Uniform polymers from controlled polymerization. Therefore the definition of polymer molecular weight should be changed .i.e.no longer the average values,2. Green polymers are mainly from the biodegradable polymers,while the bioinert polymers should be renewed in various recycle ways.Moreover,all of the polymers and their corresponding monomers should be synthesized in the so called green reactions.  
        关键词：21st century;Prospcts;Polymer material   
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        发布时间：2022-09-18
      • Yongdong Chen,Guisheng Yang
        Vol. 12, Issue 3, Pages: 10-13(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.002
        摘要：The development,application and trend of engineering thermoplastics,especially compounding engineering thermoplastics,were reviewed.  
        关键词：Engineering thermoplastics;Alloying;Blending;Metallocene catalyst;Nanometer material   
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        发布时间：2022-09-18
      • Wei Chen,Zifang Guo,Ruen Wang,Zhenhua Jing
        Vol. 12, Issue 3, Pages: 14-21,27(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.003
        摘要：This paper presents an overview of the progress in Metallocene-based catalysts and polyolefines in China,including the research and development of Metallocene catalysts;the preparation of Metallocene-based polyolefines both in laboratory and in pilor plant scale;polymer characterization;grade-development and application of target products etc.  
        关键词：Metallocene;Polyolefines;Development progeress;Production facility   
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        发布时间：2022-09-18
      • Tongyu Cao
        Vol. 12, Issue 3, Pages: 22-27(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.004
        摘要：In the present paper the development cause in our country growing out of nothing,from little to a few and from weaker to stronger for the synthetic rubbers,resins and polymer emulsions produced by emulsion polymerization since establishing the state for50years is reviewed.The great achievements and the current situation of the theoretical study,the developments of both novel products and new techniques,and applications of emulsion polymer and polymer emulsions are introduced.  
        关键词：Emulsion polymerization;Polymer emulsion;Emulsion polymer;Latex   
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        发布时间：2022-09-18
      • Stephen Z.D. Cheng,Lei Zhu,Christopher Y. Li
        Vol. 12, Issue 3, Pages: 28-33,46(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.005
        摘要：A classical concept of a metastable state is a local free energy minimum that may ultimately relax to the stable equilibrium state of a global free energy minimum via an activation process. This process is different from the barrier-free relaxation that spontaneously takes place when an unstable state relaxes. In order to be classified as metastable,the lifetime of a metastable state must be longer than the time scale of observation,which in turn is practically limited by experimental equipment and the patience of the observer.In the classical concept of metastable states there is an assumption that the systems are large enough so that there is no need for consideration of size or other kinetic effects on the system.In general,polymers are much more prone to access the metastable region than small molecules.Polymeric materials,with their various hierarchies of mi-crostructure,may have metastable states present due to small phase size,composition,external fields and other causes.In this review,our focus will be on concepts and experimental observations of metastable states in polymer phase transformations where two ordered structures exist.The phase stability relationships of these structures will be discussed with respect to the phase size,namely,the lamellar thickness.The concepts involved in metastable states and metastability are not only important in the scientific understanding of condensed polymer physics,but are also useful for practical materials development and applications.  
          
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        发布时间：2022-09-18
      • Mujie Yang,Yang Li
        Vol. 12, Issue 3, Pages: 34-42(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.006
        摘要：The research progress of humidity sensors is summarized,with the emphasis on the four types of polymeric humidity sensors:capacitive-type,resistive-type (electron and ion conduction) ,surface acoustic wave (SAW) type and optical-type.The results for research on novel poly-yne humi-sensing materials and the developing tendency in this field are presented.  
        关键词：Polymer;Humi-sensing materials;Humidity sensor;Poly-yne   
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        发布时间：2022-09-18
      • Cheng Ye,Peiwang Zhu,Peng Wang
        Vol. 12, Issue 3, Pages: 43-46(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.007
        摘要：The analyses of the status-in-art of the second order nonlinear optical poled polymers and requirements of practicality indicate that the orientation stability has been satisfied essentially.How to optimize comprehensively the properties of the materials has become the most important key problem for practical application of second order nonlinear optical poled polymers.  
        关键词：Nonlinear optics;Poled polymer;Electro-optic modulation devices   
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        发布时间：2022-09-18
      • Meixiang Wan
        Vol. 12, Issue 3, Pages: 47-53(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.008
        摘要：A review with 33 refereces on structure characteristics,physical and chemical properties,technical application,progress and challenge for the conducting polymers.  
        关键词：Conducting polymes;Doping;Soliton polaron;Bipolaron;Molecular wire and devices;Lightemitting diode(LED)   
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        发布时间：2022-09-18
      • Qifeng Zhou
        Vol. 12, Issue 3, Pages: 54-61(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.009
        摘要：The side-chain type liquid crystalline polymers are normally flexible chain polymers.However,because of the unique molecular architecture the mesogen-jacketed liquid crystalline polymers are rigid (or semi-rigid) chain polymrs even if they have mesogenic units as side groups as it is in the flexible side-chain type liquid crystalline polymes.In other words,mesogen-jacketed liquid crystalline polymrs are side-chain type polymers when viewed from the point of chemical structures,they are main-chain type polymers when viewed from their physical properties.The evolution of the concept and the progress in study on mesogen-jacketed liquid crystalline polymers are discussed.  
        关键词：Liquid crystalline polymr;Mesogen-jacketed liquid crystalline polymer;Chain rigidity;Poly[2,5- bis(4-methoxybenzoyloxy) styrene];Poly (diphenyl vinylterephthalate);Poly (dicyclohexyl vinylterephthalate);Thermotropic liquid crystal;Lyotropic liquid crystal;Persistence length   
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        发布时间：2022-09-18
      • Bing Liao,Yuhui Huang,Hao Pang,Guangmin Cong
        Vol. 12, Issue 3, Pages: 62-66(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.010
        摘要：In this paper,the new recycle technology of waste plastics was reviewed.The trend of development of recycle technology for waste plastics was discussed.  
        关键词：Waste plastics;Recycle technology   
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        发布时间：2022-09-18
      • Guangzhao Zhang,Ming Jiang
        Vol. 12, Issue 3, Pages: 67-72,93(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.011
        摘要：This review deals with two basic topics related to the research and development of ionomer materi-als,i.e.,association and complexation of ionomers.The discussion focuses on the effect of ionomer structure on the association and complexation.Besides,a comparison between the complexation caused by ionic interaction and that by hydrogen bonding has also been made and discussed.  
        关键词：Ionomer;Association;Complexation;Molecular assembly   
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        发布时间：2022-09-18
      • Xiaozhen Yang
        Vol. 12, Issue 3, Pages: 73-74,120(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.012
        摘要：The theory proposed here can predict the behavior and the contributions of the energy term and the entropy term during the elongation of polymers.This proves that the change in chain conformations is physical-ly able to make the upward curvature at larger elongation.The energy contribution of 13% calculated in the present study is coincided with the observation for natural rubber.  
        关键词：Polymer;Conformational elasticity;Theory   
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        发布时间：2022-09-18
      • Delu Zhao,Xianfeng Li
        Vol. 12, Issue 3, Pages: 75-82(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.013
        摘要：Numerical methods for the simulation of the flow of polymeric complex fluid has been reviewed in this paper.By comparison,the limitation of the classical finite element method and the advantage of the Lagrangian- Eulerian method have been pointed out.The rationality and flexibility of the Lagrangian-Eulerian method have been clarified by the consistency between the numerical results and the experimental observations.  
        关键词：Polymeric complex fluid;Finite element method;Lagrangian-Eulerian method   
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        发布时间：2022-09-18
      • Rongrui Wu
        Vol. 12, Issue 3, Pages: 83-87(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.014
        摘要：In this paper 3 parts of research works on fiberformed polyethyleneterephtalate copolyesters are discussed.(1) Effect of chemical structure of comonomers on the propertites of copolyesters.The experimental results indicate the obvios difference in the physical properties between copolymer obtained from comonomer with iso-or ortho-structure of phenyl ring and copolymer obtained from comonomer with flexible chain,For example,in comparison with polyethyleneterephtalate the glass transition temperature of the latter is decreased more than the former;the crystallization rate of the former is decreased,but the crystallization rate of the latter is increased.(2) Effect of physical properties of copolyesters on properties of fibers.For example,decreasing of glass transition temperature of copolyester is advantageous for improving the dyeing propertie of fiber,so the copolyester with flexble chain can be applied to modification of dyeability of fiber because the glass transition temperature of this type of copolyester is abvious lower than that of normal polyester PET .(3) A new type of fiberformed copolyester-normal pressure disperse dye copolyester is discussed.  
        关键词：Polyethyleneterephthalate;Copolyester   
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        发布时间：2022-09-18
      • Guanying Wu
        Vol. 12, Issue 3, Pages: 88-93(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.015
        摘要：In this paper at first a very brief introduction of the history of carbocationic polymerization was given.The slow development in a period of the past 30~40 years was attributed to its high reactivity.The breakthrough began with the clear understanding of the nature of initiation reaction and the essence of modern carbocationic polymerization was to bring the initiation,propagation and termination under control.The recent progress of carbocationic polymerization is in close connection with macromolecular engineering,especially by living carbocationic polymerization(LCCP) .A few examples of macromolecular engineering by "INIFER" and LCCP were presented. Finally,the trend and problem met in this field are advanced.  
        关键词：Cationic polymerization;Living cationic Polymerization;Controled cationic polymerization   
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        发布时间：2022-09-18
      • Xianmo Deng,Xiaohong Li
        Vol. 12, Issue 3, Pages: 94-98(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.016
        摘要：Cancer chemotherapy is not always effective.Difficulties in drug delivery to the tumor,drug toxicity to normal tissues,and drug stability in the body contribute to this problem.Biomedical polymers provide an al- ternative means for delivering chemotherapeutic agents.This article reviews the principle of chemotherapy using polymeric targeting drugs,polymer implants,injectable microspheres and polymeric chemoembolization,and summaries recent preclinical and clinical studies of these new technology for treating cancer.  
        关键词：Biomedical polymer;Drug delivery system;Cancer chemotherapy   
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        发布时间：2022-09-18
      • Fusheng Du,Zichen Li,Fumian Li
        Vol. 12, Issue 3, Pages: 99-106(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.017
        摘要：Charge transfer phenomenon has attracted much attention due to its significance in academics and applications.A series of vinyl monomers bearing fluorophore moieties and their polymers were reviewed on their synthesis and photochemical behavior including fluorescence and photosensitizing behavior.The fluorescence intensity of these monomers are always dramatically lower than those of their corresponding polymers or copolymers at the same chromophore concentration.Such a phenomenon is termed as fluorescence "Structural Self- Quenching Effect" (SSQE) ,which is caused by the intramolecular charge transfer interaction between electrondonor and electron-acceptor in the same molecule.For the SSQE of these monomers,carbon-carbon double bonds play an important role.Acrylic monomers bearing electron-donating chromophore moieties can be photopolymerized, as well as be used to initiate the photopolymerization of other monomers which do not have chromophores moieties.  
        关键词：Charge transfer;Fluorescence structural self-quenching effect(SSQE);Photopolymerization   
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        发布时间：2022-09-18
      • Haiqing Guo
        Vol. 12, Issue 3, Pages: 107-114(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.018
        摘要：Formation of new macromolecular architecture from different kinds of monomers by means of active center transformation reaction were reviewed.  
        关键词：Active center transformation;Macromolecular architecture;Living polymerization;Block and graft polymers   
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        发布时间：2022-09-18
      • Shuke Jiao,Xiaonong Chen
        Vol. 12, Issue 3, Pages: 115-120(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.019
        摘要：Thermally reversible covalent crosslinking is a new kind of crosslinking reaction,by which a novel thermoplastic elastomers both with the properties of thermosetting rubber and the plasticate prossability would be obtained.In this paper,the Diels-Alder reaction between the cyclopentadiene (CPD) and dicyclopentadiene (DCPD) was introduced briefly.The reaction and method of introduce it into linear polymer as a thermally reversible covalent crosslinkage were discussed in detail.Progress in this field was reviewed with 21 references.  
        关键词：Diels-Alder reaction of CPD;Thermally reversible covalent crosslinking;Thermoplastic elastomer   
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        发布时间：2022-09-18
      • Youliang Hu
        Vol. 12, Issue 3, Pages: 121-127(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.020
        摘要：In this paper,the development and evolution of typical Ziegler-Natta catalysts,Metallocene catalysts and New-Generation Posttransition metal catalysts for olefin polymerization were reviewed.  
        关键词：Ziegler-Natta Catalysts;Metallocene;Post-transition Metal;Olefin polymerization   
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        发布时间：2022-09-18
      • Liban Chen
        Vol. 12, Issue 3, Pages: 128-133(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.021
        摘要：CO2 is an important carbon resource developing at the end of this century.It has been possible now to readily copolymerize CO2 with epoxides to form aliphatic polycarbonates.By addition of third monomers, chain extenders and regulators,the chemical structure of the copolymers can be modified and the molecular weights and functionalities of the copolymers can be controlled.The polymerization processes can be simulated by computers with the knowledge of phase equilibrium in the system and the kinetics of the reaction.The properties of the copolymers can be modified and varied by chemical crosslinking,blending,complexation and IPN-forming with other types of polymers.CO2 copolymers have found many applications and will certainly be an important polymeric material in the coming century.  
        关键词：Carbon dioxide;Epoxides;Copolymers;Aliphatic polycarbonates   
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        发布时间：2022-09-18
      • Lingying Zheng
        Vol. 12, Issue 3, Pages: 134-137,144(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.022
        摘要：In this paper the fundamental principle、characteristic、content and the advancement in recent 50 years as well as the application in industries of membrane separation technology have been briefly illustrated; the materials of organic polymer separation membrane which is most widely used for the time being have been systematically described. The paper has an analysis of the recent developments on membrane separation and a simple introduction of membrane separation technology in China.  
        关键词：Membrane separation;Separation membraneOrganic polymer   
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        发布时间：2022-09-18
      • Zhaobin Zhang,Shengkang Ying
        Vol. 12, Issue 3, Pages: 138-144(1999) DOI: 10.14028/j.cnki.1003-3726.1999.03.023
        摘要：Several important controlled radical polymerization systems developed recently were reviewed by combination of the published literature and the authors’ research results on atom transfer radical polymerization (ATRP) .In our laboratory,a wide range of novel block copolymers were synthesized by transformation of various mechanism polymerizations(e.g.anion,cation,telomerization and step-growth) to ATRP.A series of graft copolymers with controlled branched chains were prepared using halogenation,chloromethylation and ATRP methods. Wellcontrolled fluorinated random copolymers were obtained.Star(co) polymers were also synthesized via multi-functional initiator and coupling approach.In addition,some new catalyst systemswhich based on rare earth metal or using 1,10-phenanthroline and bis (2-dimethyl-amionethyl) ether as ligand,were developed.Poly (methyl methacrylate) with bimodal distribution,polystyrene with high melting point and thermoplastic elastomer (PSt-b- PBA-b-PSt) were prepared by emulsion "living" radical polymerization.Good prospects for living radical polymerization were also shown.  
        关键词：Atom transfer radical polymerization;Controlled radical polymerization   
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        发布时间：2022-09-18
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