最新刊期
      卷 ， 期 2 ， 1988

        Research Article

      • Du Zuo-dong,Chen Jian-hua,FENG Sheng-yu
        Issue 2, Pages: 81-89(1988)
        摘要：Polysilane homopolymer, polysilane copolymers that contain polyphenylphenylsi-lylene units were synthesized and characterized, such as(1) polysilane homopolymer:some linear polysilanes complexed with either electron donors or acceptors to give-cbarge-transfer complexes.  
          
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      • ZUO Ju,MI Jiang-lin,XIE Guang-xian,YANG Wen-ying
        Issue 2, Pages: 90-94(1988)
        摘要：The morphological structures of polyimide films were studied by laser light scattering, X-ray diffraction, electron microscopy, infrared spectroscopy, cone light beam method and so on. There are obvious differences in orientation, nodules, chain-nodules, surface situation and spherulites for the PI films but no chemical differences. So various mechanical properties result from the different morphology. In addition, Azimuth Ωd can be used as a reference parameter to evaluate the orientation of the films.  
          
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      • QIU Kun-yuan,GUO Xin-qiu,MA Jing,FENG Xin-de
        Issue 2, Pages: 95-100(1988)
        摘要：Aqueous solution polymerizations of vinyl monomers, such as acrylamide (AAM), acry-lonitrile (AN) and methyl methacrylate (MMA), initiated with peroxydisulfate and N, N, N', N'-tetramethylethylenediamine (TMEDA) system have been investigated in this paper. It was found that when the ratio of [TMEDA] /[peroxydisulfate] was in the range of 0.5-2, the polymerization rate Rp and the ultimate conversion were enhanced while the ultimate conversion decreased when the ratio was 5-50, and the molecular weight of polymer always decrea-sed. The activation energyof polymerization and polymerization rate equation were deter-mined.  
          
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      • SUN Yi-shi,ZHAO Shi-qi,LIN Xiu-ing,WANG Xi-qun
        Issue 2, Pages: 101-106(1988)
        摘要：The following affecting factors of rubber toughened epoxy resin system were studied: 1. kinds of curing agent used 2. the Mc value of the matrix 3. the bonding force between the dispersed phase and the matrix. Accoring to our experimental results, the average chain length between crosslinks (Mc) is found to be a much more important affecting factor, chemical bonding between the dispersed phase and the matrix is also important. A toughening mechanism of rubber toughened epoxy resin has been proposed. In the material with relatively low cross-linking density,extensive fracture process stripe is formed which is induced by the com-bined stress field near the rubber particles. The chemical bonding between the dispersed phase and the matrix may increase the strength of the local stress field about the rebber particles which is infavor of broading the fracture process area.  
          
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      • NI Shao-ru,SHEN Lian-fang,YU Fu-sheng,QIAN Bao-gong
        Issue 2, Pages: 107-112(1988)
        摘要：Proton-decoupled, 13C-NMR (operating at 50.3 MHz) is used to determine spin-lattice relaxation time (T1), Nuclear Overhauser Enhancement (NOE), line width and Chemical shift of 1,2-polybutadiene at different temperatures in CDCl3 solution and the temperature dependence of molecular motion of 1,2-polybutadiene is studied with these 13C-spin relaxation parameters. It is found that an increase of NOE and of the slope of the plot of line width vs. temperature appears at a range of -10-30℃ and this implied that long-range chain mo-tion is frozen in this temperature range which is consistent with that of glass transition of the sample. The minimum values of curve of nT1 vs. temperature for all carbons occur at about -45℃.  
          
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      • Qian Jin-wen,DU Zhi-qiang
        Issue 2, Pages: 113-119(1988)
        摘要：A new one-point intrisic viscosity equation,[η] = , is proposed, which is applicableto the polymer-solvent systems with higher values of Muggins' constant (0. 472≤K'≤0.825). It is tested and compared with four other one-point equations using 192 data of 27 polymer-solvent systems of 19 polymers from literatures. The results obtained from the new equation are very satisfactory. The establishment of this equation will expand the range of application of evaluating [η] using one-point method.  
          
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      • Wang Sheng-long,WANG Fo-song
        Issue 2, Pages: 120-124(1988)
        摘要：A conducting form of polyaniline are prepared by the chemical oxidation of aniline. The effect of PH value, different acid, concentration of acid and amount of oxidant on polymerization reaction were studied. The polymers obtained were characterized by IR, X-ray diffraction and DSC technique. Doping reaction of the polymers obtained were studied.  
          
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        发布时间：2021-03-19
      • LIU Ri-xin,LIN Feng,WU Shi-kang
        Issue 2, Pages: 125-131(1988)
        摘要：In this work, several transition metal ionic complexes-the metal (Co+2, Ni+2, Mn+3) salts of 2-[2,4-dihydroxybenzoyl] benzoic acid are synthesized. The physico-chemical properties are characterized in detail and their ability of photostabilization are evaluated. The result shows that the complex containing manganese has the best ability of photostabilization. This is due to the least break of intramolecular hydrogen bond in the metal salts studied here.  
          
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      • JIN Chun-shan,CHEN Hui-zhen,WANG Su-yun,SUN Shu-lian
        Issue 2, Pages: 132-136(1988)
        摘要：The method of rapid evaluating parameters of long chain branching and molecular weight from GPC and intrinsic viscosity data was discussed in this paper. In this method using trial and error by computer and graphic method, the degree of branching b and critical molecular weight M of polyethylene SRM 1476 and polybutadienes was obtained simultaneously. In addition, other parameters of branch can be obtained.  
          
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        Research Bulletin

      • CAO Yang,SUN He-cai,LIU Su-feng,WANG Zhi-ming
        Issue 2, Pages: 137-140(1988)
        摘要：Acetylene has been polymerized with thorium coordination catalyst (Th(P204)8Cl4)-Al(C2H5)3 to form free standing film of polyicetylene (PA). The PA film possesses metallic luster of silver. The polymerization process and its characterization results of IR, NMR, SEM, X-ray diffration and the electric resistence are reported in this paper.  
          
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        发布时间：2021-03-19
      • GAO Hong-zhuo,ZHANG Yan-shou,XU Lu
        Issue 2, Pages: 141-144(1988)
        摘要：The relationship between the parameters of physical properties of cis-l,4-poly butadiene raw rubber and artificial evaluation was established using pattern recognition technique. The important parameters controlling the quality of raw rubber were obtained. Furthermore, the mathematical formula instead of artificial evaluation to calculate the quality gradation with parameters of physical properties was developed.  
          
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        发布时间：2021-03-19
      • SUN Qing,WANG Fo-song
        Issue 2, Pages: 145-148(1988)
        摘要：Polymerization of isoprene with ternary catalyst system Fe(acac)s-electron donor (D)-Al(i-Bu)3 has been studied. It is found that the catalytic activity is related to the nature of D, and is decreased with following order: o-phenanthroline>2,2'-dipyridine> p-phenyldiami-ne> o-phenyldiamine>p-nitroaniline>o-nitroaniline. Results on 1H-NMR of polyisoprene obtained showed that content of 3,4-units in polymer reached 70%, cis-1,4 Content is about 30% but no trans-1,4 and 1,2 units were observed. X-ray, TEM and DSC studies on polymer indicated that polyisoprene shows crystalline structure,and its Tm～121℃.  
          
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      • WU Mei-yu,YONG Zhong-gen,JIN Yi
        Issue 2, Pages: 149-151(1988)
        摘要：This paper described the method for determination primary hydroxyl relative contents of polyether polyol by 19F-NMR and provided accuracy and precision of this method.  
          
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      • GUO Xin-qiu,QIU Kun-yuan,FENG Xin-de
        Issue 2, Pages: 152-156(1988)
        摘要：The initiation mechanism of the title redox system was studied by spin trapping technique and ESR spectrum. The free radical (CH3). NCNCH2(CH3)NCH2 (I) is one of the initial free radicals responsible for the initiation of vinyl polymerization in addition to sulfate free radical (HO3SO). The result of amino end group analysis confirmed the fact that the free radical I did initiate vinyl polymerization. The effects of the diamine concentrations on the final percentage conversion of acrylamide polymerization and on the molecular weights of PAAM were also studied. The initiation mechanism was proposed finally.  
          
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      • WANG De-hua,George C. Levy
        Issue 2, Pages: 157-160(1988)
        摘要：A two-dimensional 13C-1H heteronuclear shift correlated MNR spectroscopy of poly (n-butyl methacrylate) is reported. The 1H spectrum of the polymer is assigned by this technique. The assignment was verified by a 2D heteronuclaer NOE spectroscopy.  
          
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