最新刊期
      卷 11 ， 期 4 ， 1998
      • Chi Wu,Xiaohui Wang,Jun Gao
        Vol. 11, Issue 4, Pages: 1-9(1998) DOI: 10.14028/j.cnki.1003-3726.1998.04.001
        摘要：Using a combination of static and dynamic light scattering,we systematically studied the coil-to-globule and globule-to-coil transitions of a single linear poly (Nisopropylacrylamide) (PNIPAM) chain and the volume change of spherical PNIPAM microgels in water.We made,for the first time,the conformation change of individual homopolymer chains from a coil to a fully collapsed stable single-chain globule and confirmed the existence of the crumpled coil and the molten globule states between the random coil and the fully collapsed globular states.The study of the coil-to-globule transition kinetics rejects the previously suggested high chain-knotting density inside the globule.Our result also indicated that even in its fully collapsed state,the globule and the microgel particle still contain 66% and 70% water, respectively.The study of interaction between the PNIPAM microgel and surfactant suggested a new swelling and shinking mechanism different from the previously proposed hydrophobic interaction.Moreover,our NMR results showed,for the first time,that surfactant molecules are able to form micelles in presence of the gel network even the surfactant concentration is much lower than its critical micelle concentration.A comparison of the phase transitions of the linear chains and microgels revealed that previously observed discontinuous volume change in bulk PNIPAM gels is due to the imbalance between the bulk shear module and the internal stress originated from the inhomogeneous shrinking,which is different from the theoretically predicted discontinuous volume phase transition.  
        关键词：Single-chain dynamics;Transition between the coil and globule states;Volume phase transition;Spherical microgel.   
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        发布时间：2022-09-18
      • Meixiang Wan,Yongming Li,Youqing Shen,Jie Huang
        Vol. 11, Issue 4, Pages: 10-15(1998) DOI: 10.14028/j.cnki.1003-3726.1998.04.002
        摘要：This paper reviews on progress of soluble conducting polymers,transparent and conducting thin film of polymers,and heterojunction devices of porous silicon (PS ) with conducting polymers,which are related to light emitting diodes (LED).  
        关键词：Light emitting diod (LED);Polyaniline;Polypyrrole;Schottky rectifying diode;Microtubes of conducting polymer;Soluble conducting polymer   
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        发布时间：2022-09-18
      • Tao Wang,Enle Zhou
        Vol. 11, Issue 4, Pages: 16-22,48(1998) DOI: 10.14028/j.cnki.1003-3726.1998.04.003
        摘要：This paper introduce the phase classification and aggregate structure of discotic liquid crystals. Molecular engineering, LB film and liquid crystalline elaster studies of discotic system are also reviewed.  
        关键词：Discotic liquid crystal;Molecular engineering;LB film;Liquid crystalline elaster   
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        发布时间：2022-09-18
      • Yanling Luo,Gengchao Wang,Zhiping Zhang
        Vol. 11, Issue 4, Pages: 23-33(1998) DOI: 10.14028/j.cnki.1003-3726.1998.04.004
        摘要：Several conductive percolation models of carbon black filled polymer composites with PTC characteristics were reviewed.Various kinds of assumptions and models dealing with conductive composites were discussed.The differences between experimental data and predicted resistivity were compared in the present paper.  
        关键词：Percolation model;Conduction mechanism;Crystal lattice model;Electric resistivity;Electrically conductive polymer composite   
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        发布时间：2022-09-18
      • Zhiping QIU,Yousi ZOU
        Vol. 11, Issue 4, Pages: 34-40,73(1998) DOI: 10.14028/j.cnki.1003-3726.1998.04.005
        摘要：This paper gives a description and discussion of the recent dev elopments in group transfer polymerization. It includes relatively newmonomers、initiators、catalysts、examples of polymer architectural control and the applications of GTP in the synthesis of functional polymer. Most works are focused on the polymer architecture. 54 references were quoted.  
        关键词：Group transfer polymerization;Functional polymer   
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        发布时间：2022-09-18
      • Hongfang Zhang,Huan Gao,Siyang Liu,Zhishen Mo
        Vol. 11, Issue 4, Pages: 41-48(1998) DOI: 10.14028/j.cnki.1003-3726.1998.04.006
        摘要：In this paper five kinds of method to calculate crystallite size and lattice distortion for the analysis of polymer X-ray diffraction line broadening were review ed. Fivekinds of method are the approximation function method, Hosemann paracrystalline structural variance analysis method, Wilson variance method, Variance-range function method and fourth central moment method. Use ways and conditions for the methods above mentioned were described in moredetail, and given some applied examples in our laboratory.  
        关键词：Polymer;X-ray diffraction line broadening;Crystallite size and lattice distortion   
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        发布时间：2022-09-18
      • Yanqing Lian,Mingqi Li,Deshan Liu
        Vol. 11, Issue 4, Pages: 49-56(1998) DOI: 10.14028/j.cnki.1003-3726.1998.04.007
        摘要：The research and development of liquid crystalline polyurethanes were reviewed, the synthesis、properties and influences of liquid crystalline polyurethanes were concluded,then author’s works was introduced and the development tendencies of liquid crystalline were advanced.  
        关键词：Liquid crystalline polyurethane;Liquid crystal;Synthesis;Substitute effect;Hbond effect   
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        发布时间：2022-09-18
      • Xianming Shi,Yaoman Wu,Yunzhao Yu
        Vol. 11, Issue 4, Pages: 57-64(1998) DOI: 10.14028/j.cnki.1003-3726.1998.04.008
        摘要：For its unique properties in some aspects,Phenolic resin is an important kind of matrix resin used as heat-resistant materials.In this paper,several major methods about the modification of phenolic resin to improve its heat-resistance were reviewed.  
        关键词：Heat-resistant material;Phenolic resin   
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        发布时间：2022-09-18
      • Wuli Yang,Jianhua Hu,Shoukuan Fu
        Vol. 11, Issue 4, Pages: 65-73(1998) DOI: 10.14028/j.cnki.1003-3726.1998.04.009
        摘要：In this Paper, the synthesis of the photochromi sm functional polymers and their photochromism mechanism, developing history and possibility have been reviewed in detail.  
        关键词：Photochromism;Functional polymer;Optical data storage;Polymer reaction   
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        发布时间：2022-09-18
      • Biye Ren,Feng Gao,Zhen Tong
        Vol. 11, Issue 4, Pages: 74-79(1998) DOI: 10.14028/j.cnki.1003-3726.1998.04.010
        摘要：Polyelectrolyte-surfactant complexes are formed by the electrostatic interaction of polyelectrolytes and oppositely charged surfactants as well as the hydrophobic interaction of surfactants in aqueous solution.The complexes may be water-soluble or water-insoluble, depending on the charge density,concentration and stoichiometric of ratio components,etc.The polyelectrolyte-surfactant complexes have a variety of applications.In the paper we review the literature dealing with the aggregating process and structure of the water-soluble polyelectrolytesurfactant complex.The miscellaneous applications of fluorescence spectra to this field are also stressed in the paper.  
        关键词：Polyelectrolyte-surfactant complexes;Aggregation;Fluorescence spectra   
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        发布时间：2022-09-18
      • Liming Zhang
        Vol. 11, Issue 4, Pages: 80-85(1998) DOI: 10.14028/j.cnki.1003-3726.1998.04.011
        摘要：The zwitterionic polymers, which contain both an equivalent amount of positive and negative ion groups along the macromo lecular backbone, have unique antipolyelectrolyte behavior in solution and wide development prospect. This paper reviews their syntheses, specific property in solution and application.  
        关键词：Zwitterionic polymer;Solution property;Antipolyelectrolyte behavior;Synthesis;Application.   
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        发布时间：2022-09-18
      • Hui Xu,Xizhang Hu
        Vol. 11, Issue 4, Pages: 86-94(1998) DOI: 10.14028/j.cnki.1003-3726.1998.04.012
        摘要：The synthetic methods of anion exchangers based on crosslinked polystyrene were reviewed comprehensively.The chloromethylation method which used chloromethyl methyl ether as reactant,due to its toxic problem,has been gradually restricted.Here we tried to discuss the possibility of the modification of chloromethylation method or the utilization of new methods which avoid the use of chloromethyl methyl ether.  
        关键词：Anion exchangers;Crosslinked polystyrene;Synthetic methods   
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        发布时间：2022-09-18
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