最新刊期
      卷 ， 期 6 ， 1979

        Research Article

      • YAN De-yue
        Issue 6, Pages: 321-334(1979)
        摘要：The problem of monomer transfer in living polymerization has been retreated theoretically according to Nanda's, Peebles's and Bresler's kinetic schemes respectively. The moleculer weight distribution functions obtained are considerably simpler than that of the above authors, and are convenient to utilize. For the reaction system involved in this paper, the functionality distribution and the average functionality which have been proposed recently in literature were studied theoretically.  
          
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        发布时间：2021-03-19
      • QIU Kun-yuan,Cao Wei-xiao,Lu Cheng-xun,FENG Xin-de
        Issue 6, Pages: 335-342(1979)
        摘要：For cross-linking purpose，a new type aromatic dimethacrylate monDmer contain-ing sulfone group，bisphenol-S-bis (3-methaerylato-2-hydroxy propyl) ether (BisS-GMlA) has been synthesized from methyl methacrylate through three steps：i．e．via sa-ponification to glycidyl methacrylate and then reacted with bisphenol-S．This Bis-S type monomer BisS-GMA is more reactive toward cross-linking polymerizatiun than the corresponding Bis-GMA type monomer，bisphenol-A-bis-(3-methacrylato-2-hydroxy propyl) ether，and the Bis-S type polymer shows greater adhesive strength than that of Bis-GMA．The radical polymerizatiun is induced either by UV light or by peroxide-amine (BPO-DMT，BPO-DHET) redox system．Moreover，a typical composite resin comsisting of some quartz filler pretreated with a silane coupling agent and the men-tioned BisS-GMA binder，has been prepared with promising meehanieal properties such as rather high cvmpresion strength，high hardness，low abrasion and low expan-sion coefficient．  
          
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        发布时间：2021-03-19
      • Deng Xian-mo,Li Yu-zhi,MA Guang-fu,Wang Guo-liang
        Issue 6, Pages: 343-347(1979)
        摘要：The terpolymerization of epichlorohydrin, ethylene oxide and propylene oxide was studied by using i-Bu3Al-H2O-Zn(acac)2 system as catalysts. The vulcanizates of the terpolymers have good properties in which low-temperature resistance is comparable to, while its oil resistance is superior to 18-nitrile, and its ozone resistance is much better than nitrile rubbers.  
          
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        发布时间：2021-03-19
      • Chen He-ming,Zhang Zhi-hong,Tang Rong-bao
        Issue 6, Pages: 348-355(1979)
        摘要：By the direct radiation grafting teehoniqlle．kinetics of the Garama-induced graft eopolymerization of st-AA to p01ytetrafluoroethyene has been studied at 20°—40℃．Dependence of the grafting temperature on the critical radiation intensity has been found．Above a given critical radiation intensity，the grafting is limited to the surface．Below that intensity，the grafting proceeds in the mass．Optical microscope and scanning electron microscope were used to study the structure of the cross section and surface of the grafted film．The grafted amount of the surface grafted film is about 1 mg／cm2，thus，the average adhe~ve strength is found to be above 100 kg／cm2．The electrical properties of the surface grafted film are the same as those in nongraft film．This indicates that the Garoma radiation．induced surface graft copolymer of st-AA to polytetrafluoroethyene could be used as constructional material with strong adhesive strength or as adhesive sealing material of the electronic parts．  
          
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        发布时间：2021-03-19
      • ZHANG Xian,QI Zong-neng
        Issue 6, Pages: 356-361(1979)
        摘要：The temperature spectra of the dynamic mechanical properties of polydimethylsi-loxane-polymethyl phenylsiloxane block copolymers with different block length of polydimethylsiloxane and polyblend which has the same chemical composition as block copolymer, were determined over a temperature rang from -150°to 100℃ by using the vibrating reed method in audio frequencies. The influence of the block length, block copolymer and polyblend on the shape of the loss peaks are discussed.  
          
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        发布时间：2021-03-19
      • Xu Mao,ZHANG Xian,LI Hui-ming,SHEN Jing-shu,JIN Xi-gao,Ding Yu-yi
        Issue 6, Pages: 362-366(1979)
        摘要：A cell for determining gas permeability of polymer tubes is designed, and a gas chromatographic method is used to measure the gas permeability of PTFE tubes. It is found that the permeation of gas through PTFE tubes, which contain a large amount of extrusion aid before their sintering, is a process of diffusion and the permeability can be strongly influenced by the change of morphological structure.  
          
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        发布时间：2021-03-19

        Research Bulletin

      • JIN Ying-tai,Sun Yu-fang,Ouyang Chun
        Issue 6, Pages: 367-369(1979)
        摘要：A new type of lanthanide complex was synthesized. The analytical results indicate that this compound is (CF2COO)2NdCl-20Et2. A binary catalyst system based on this complex combined with AlR2 can initiate polymerization of butadiene and isoprene to give homopolymer of high cis-1, 4 content. Light scattering method indicates that both the states of the aged catalyst solution and of polymerization solution are homogeneous system.  
          
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        发布时间：2021-03-19
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