最新刊期
      卷 ， 期 1 ， 1978

        Research Article

      • Huang Chih-tang,OU Yu-chun
        Issue 1, Pages: 1-8(1978)
        摘要：Aromatic dinitriles with following structure, CN-X-CN, could be polymerized by Lewis acid catalysts at about 300℃. The polymerization rate of different dinitriles, the thermo-oxidative stability and deformation temperature of the obtained polymers were investigated. The formation of 1,3,5-triazine ring by cyclotrimerization of cyano group was verified by infra-red spectroscopic analysis.  
          
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        发布时间：2021-03-19
      • Huang Chih-tang,Chen Gen-zuo,Deng Hsien-mu
        Issue 1, Pages: 9-16(1978)
        摘要：Bis(epoxytetrahydrodicyclopentadienyl) ether (Ⅱ), bis(epoxytetrahydrodicyclopen-tadienyl) ethylene glycol ether (Ⅲ) and bis(epoxytetrahydrodicyclopentadienyl)-tetramethylene glycol ether (Ⅳ) were synthesized. These diepoxides can be cured with acid anhydride mixed with glycerol, the order of cure rate is: (Ⅱ) > (Ⅲ) > (Ⅳ). The temperature-deformation curves of casting from these diepoxides were determined, the thermo-mechanical property of casting from (Ⅲ) was analogous to (Ⅳ), but both were inferior to (Ⅱ).The thermo-mechanical property of casting from (Ⅱ) was ap-proximate to dicyclopentadiene dioxide,but it was liquid and cured with faster rate.  
          
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      • Ying Chi-tsung
        Issue 1, Pages: 17-24(1978)
        摘要：A simple method for charaeterizing polymer molecular weight distribution by three parameters，Vp，(V10—Vp)，(Vp—V90)，from the gel permeation chromatogram is pro-posed． Vp being the peak elution volume of differential GPC curve charactrizes the average molecular weight of the polymer．(V10—Vp) and (Vp—V90)，where V10，V90 being elution volumes at 10％ and 90％ cumulative weight of the integral GPC curve，characterize the breadth of the GPC curve emphasizing ttle extent of the low (high elution volume) and high (low elution volume) molecular weight ends of the distribu．tion．The low and high molecular ends of the distribution usually play an important role in the effect of molecular weight distribution on the processing ctmracteristics of the polymer and mechanical properties of the fabricated article．Application of this method to the ease of polycarbonate shows that these three parameters can well characterize the differences in the GPC curves of several samples and to give good correlation with the diffeFences in the mechanical properties such as impact strength and environment stress cracking of the extruded bar specimens．  
          
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        发布时间：2021-03-19
      • Chang Hsing-hwa,Piao Ai-chih,Pei Kien-chung,Wang Tien-yung,Che Pu-shih,Liu Hsiang-luan,Lu Yen-ying,Yang Ya-chun
        Issue 1, Pages: 25-33(1978)
        摘要：Organosilicon block copolymers were synthesized by co-hydrolysis and condensa-tion of hydroxyl-end-blocked dimethylpolysiloxanes，methyltriehorosilane，phenyltrieh-lorosilane andd dimethyldichlorosilane．The relationships between resin struetures and crack-resistant properties of the plastic were investigated by measuring mechanical loss．temperature spectrum with vibrational reed method．The resin shows optimum crack-resistant properties when R/Si=1.50．hydroxyl-endblocked dimethylpolysiloxane used is about 23％ of the total weight of the resin．The high frequency power tran．sistors encapsulated with this resin show no cracks and have very stable electrical parameters after a series of examination under extreme cvnditions．  
          
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        发布时间：2021-03-19
      • Li Li-sheng
        Issue 1, Pages: 34-45(1978)
        摘要：The morphology and structures of Solvay type β-TiCl3 and δ-TiCls were investiga-ted directly by electron microscope．From electron microscopy it is revealed that in the process of catalyst preparation the products of first and second reaction steps (TiCl3 (I) and TiCl3 (II)) are aggregates of needle-shaped crystallites which were shown to be β-TiCl3 from electron diffraction pattern Similarly，pro-ducts of third reaction step (TiCl3 (III)) are shown to be aggregates of microerystal-lites with a size of～100A and in the form of d．TiCl3．The single crystal of δ-TiCl3 with rough edges was observed for the first time．Therefore．it is ascertained that transformatiou from β-TiCl3 to δ-TiCl3 took place in the third step．Moreover the number of active center on the lateral faces of microerystallites per grain of δ-TiCl3 was caleulated and estimated to be 5×1020 It is very interesting that under tile impingement of electron beam both transformation from β-TiCl3 to δ-TiCl3 and growth of δ-TiCl3 inierocrystallites were observed．Furthermore．it is proposed that during polymerization polypropylene chains would form around every δ-TiCl3 microerystallite and therefore δ-TiCl3 microcrystallites would nlove apart fronl each other，thus they were actually observed as finely dispersed phase in the polymer mass．  
          
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        发布时间：2021-03-19
      • Liu Lan-chen,Chang Te-he
        Issue 1, Pages: 46-51(1978)
        摘要：The cross-linked polymers formed by heat-curing of seven anhydrides and their eutectic mixtures with bisphenol A epoxy resin can be hydrolyzed in benzene-alcoholic sodium hydroxide solution．On aeidifying and extracting the precipitates (sodium salt of dibasic acids) which are insoluble in organic solution，their corresponding dibasic acids can be obtained．Single dibasic acid can be identified by infrared spectroscopy while mixed dibasic acids have to be differentiated by paper chromatography in isopro-panol-ammonia system．The epoxy resin cured with maleic anhydride yields fumaric acid and small amount of maleic acid upon hydrolysis and separation．The content of fumaric acid increases with elevation of curing temperature and thus proves that the occurence of this eis．trans isomerization should rather be attributed to the influence of heat during the course of cure than to the action of chemicals upon hydrolysis and aeidification．  
          
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        发布时间：2021-03-19
      • Shen Chun
        Issue 1, Pages: 52-57(1978)
        摘要：A slide rule for calculating intrinsic viscosity and molecular weight of polymers was described.  
          
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        Research Bulletin

      • Chen Chin-fu
        Issue 1, Pages: 58-60(1978)
        摘要：This paper deals with the graft copolymerization of viscose fiber-styrene in suspension. It was found that by the addition of a suitable amount of sulfur as inhibitor a definite induction period for homopolymerization can be induced. Within this induction period the graft copolymerization can proceed to completion and thus fully eliminate the formation of homopolymers. The addition of proper amount of inhibitor does not affect the rate of graft copolymerization and the unreacted monomer can be recoverd.  
          
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        发布时间：2021-03-19
      • Tung Shi-hua,FAN Chang-lie,Shu Yu-wu
        Issue 1, Pages: 61-64(1978)
        摘要：A new nitro epoxide of 2-nitroethyl glycidyl ether was prepared, characterized and successfully polymerized with BF3·Et2O to yield a new homopolymer and a new copo-lymer with tetrahydrofuran. These prepolymers are viscous oils and have reactivehydroxyl groups which are readily vulcanized with toluene diisocynateand glycerine to produce rubbery elactomers.  
          
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