最新刊期
      卷 ， 期 4 ， 1979

        Research Article

      • WANG De-hua,Wang Ling-li,Lu Pai-sheng,Li Jin-liang,Yuan Jin-yu
        Issue 4, Pages: 193-200(1979)
        摘要：Based on the method for the determination of branching in polymers reported by Ambler, a calculation method and an electronic computer program were developed, to be used on a DJS-6 electronic computer made in China with ALGOL-60 language.The effects of branch models, short-chain branching and long-chain branch function on calculated results are discussed. It was concluded that this method can be used in qualitative comparison of branchings among Nickel-based cis-polybutadienes.  
          
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        发布时间：2021-03-19
      • QIAN Bao-jun
        Issue 4, Pages: 201-209(1979)
        摘要：The thermo-swelling contraction of a series of air-dried PAC fibres is firstly determined. A stage of very rapid entropic contraction S' is observed, followed by a second stage of relatively slow rate of contraction. With a model of contraction of a macromolecule, a good correlation between S' and cos2α is noticed, where a is the angle of orientation.With the supposition that the slow contraction is due to a disorientation effect of the swollen fibre, an equation is derived, with which cos2αm value can be calculated.The agreement between -cos2a nad cos2am serves as a support to the theory of disorien-tation.  
          
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        发布时间：2021-03-19
      • Lu Cheng-xun,Li Xiao-shu,Li Wei-fu,FENG Xin-de
        Issue 4, Pages: 210-214(1979)
        摘要：A boron-containing vinyl monomer, p-boronobenzyl 2-methacrylate (V) has been synthesized and polymerized. p-Boronobenzyl 2-methacrylate was readily polymerized in alcohol by AIBN to polymer having melting point 320-5℃. It was copolymerized with MMA in bulk and a hard and transparent glass sheet with softening point 158 ℃ containing 8% of (V) was obtained. It has been found that these boron-containing organic glasses are more heat-resistant than ordinary organic glass plexiglass.  
          
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        发布时间：2021-03-19
      • XIE Ze-min,LI Qi-shan,WANG Jin-ting,Xie Zu-shou
        Issue 4, Pages: 215-223(1979)
        摘要：The synthesis of linear polyorganosiloxane containing cyclodisilazane in the backbone was described. The polymers neither crosslinked during polymerzation nor on stroage. This characteristic is obviously different from what have been reported in the literature. Vulcanized rubber prepared from the polymer E has good mechanical strength and fine hydrolytic stability. Its heat resistance is almost as good as that of polycarborane siloxane rubber. Heating at 350℃ for 24 hours in air, it still retains an elongation of 100% and tensile strength of 80 kg/cm2.  
          
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        发布时间：2021-03-19
      • HUANG Zhi-tang,Wang Li-ben,Wang Jin-zhen,Zhang Shu-ying
        Issue 4, Pages: 224-232(1979)
        摘要：The cyclotrimerization of following aromatic dinitriles with benzothiazole ring were investigated:The weight loss of polymers obtained under optimum conditions at 371℃ (700°F) in air during 200 hours was about 15%. It was superior than ordinary heat-resistant polymers. Its deformation temperature was above 400℃. The formation of 1,3, 5-triazine ring by cyclotrimerization of cyano group was verified by infra-red spectro-scopy.  
          
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        发布时间：2021-03-19
      • XIE De-min,Zhong Chong-gi,Yuan Nai-ai,Sun Yu-fang,Xiao Shu-xiu,OUYANG Jun
        Issue 4, Pages: 233-239(1979)
        摘要：1,3-Plentamene prepared from aeetylacetone in our laboratury contained 91.7％ trans- and 8.3％ cis-isomers．Homopolymerization of 1，3-pen,tadiene and its eopoly-merization with butadiene were earried out with heterogeneous catalysts prepared from NdCl3-C2H5OH-Al(C2H5)3 in hydrocarbon solvent．The results obtained showed that only trans-isomer of 1．3-pentadiene can be polymerized with these catalyst to high molecular weight polymer with high conversion．The structure of the polypen-tadiene has been examined by IR．NMR and X．ray spectra．It was found that the polymer contains predomlnantly cis-1，4-unit with isotactic configuration and exhibits erystallinity．The data obtained by IR and dynamic mechanical method indicated that the product of copolymerization by above mentioned catalyst system is a randum eopolymer．  
          
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        发布时间：2021-03-19
      • CHEN Shou-xi,LONG Cheng-fen
        Issue 4, Pages: 240-245(1979)
        摘要：The supermolecular structure of poly-p-phenylene terephthalamide (PPTA) films has been studied by optical and scanning electron microscopy. The samples were prepared by coagulating crystallization from anisotropic solution of PPTA in 100% H2SO4 which were sheared and then relaxed for different time. Three kinds of morphological structures, spherulitie, shish-kebab and mat like domain aggregates were observed from sheared anisotropic solutions.  
          
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        发布时间：2021-03-19
      • WANG Shen-guo,WANG Yue-ding,Mo Qi-wen,Liu Rui-qiong,Xiao Ea-pei
        Issue 4, Pages: 246-249(1979)
        摘要：Polyether-polyester block copolymers with potassium titanyl oxalate and titanium dioxide as catalyst systems have been studied. It was found that there was a simple relationship between melt index and intrinsic viscosities of the copolymers obtained from different catalyst systems, but such relationship varies with different catalysts. A simple calculation equation for intrinsic viscosity has been derived.  
          
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