最新刊期
      卷 ， 期 2 ， 1979

        Research Article

      • King Shie-gao,Li Huei-ming,Fu Shiu-chen
        Issue 2, Pages: 65-73(1979)
        摘要：The relationship between IR characteristic band and the structure of poly (p-benzamide) -(Ⅰ) and poly (p-phenylene terephthalamide)-(Ⅱ) has been studied. We have indicated the differences between (Ⅰ) and (Ⅱ). The oriented state of film (Ⅱ) has been observed by IE dichroism. The chemical analysis method has been improved. Terephthalic acid and terephthalic amine separated from the hydrolyzate were obained and identified respectively. In such way we are sure that Kevlar-49 fiber has the structure of (Ⅱ). Using DTA method, Tm,Td and so on has been obtained from DTA spectrum.  
          
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        发布时间：2021-03-19
      • Chang Hsing-hua,Lu Yen-ying,Yang Ya-chun,Wang Tien-yung,Liu Hsiang-luan,Piao Ai-chih,Pei Kien-chung,Che Pu-shih
        Issue 2, Pages: 74-83(1979)
        摘要：It has been shown that increasing the temperature of hydrolysis or using a mixed solvent composed of acetone and toluene favours the hydrolytic co-condensation of me-thyltrichlorosilane with phenyltrichlorosilane and dimethyldichloroaihme，but avoids the gel-forming phenomenon．As a result of which a solventless,hydroxyl condensativn type silicone resins with lower R/Si，C6H5/R ratio and higher Si-OH group content can be prepared，and the resins are suitable for transfer moulding compounds．By umng these methods the probedure is simplified，the time of operation is greatly shortened and the quality of the resins is stable．In addition．the relation between the structures of the resins and the properties of the transfer moulding plastics has been discussed．A proper choice of curing agent and a general purpose reinfereed filler will result in excellent performance of the plasties．  
          
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      • Duan You-lu,Huang Ting-chun,Sun Jin
        Issue 2, Pages: 84-87(1979)
        摘要：The relationship between the melt index, the tensile strength and the stress-crack resistance, and that between the end-group structure and thermal stability of copo-lymer of tetrafluoroethylene and hexafluoropropylene have been studied. It was shown that: (1) Within a definite copolymer composition and molecular weight distribution, the relationship between the melt index and the tensile strength of the copolymer can be expressed by the empirical equation: F= 350-18.3 (MI); (2) The copolymer with melt index larger than 4 is Poor in thermal stress-cracking properties;(3) When the end-group was converted into -CF=CF2 by heat treatment at 380℃,the copolymer was shown to be stable thermally during extrusion processing.  
          
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        发布时间：2021-03-19
      • Hsu Cheng-wei
        Issue 2, Pages: 88-96(1979)
        摘要：The following new one-point method equation is obtained from the considerations of the relationship between the Huggins constant K' and the hydrodynamic and ther-modynamic interaction of polymer and solvent.Where x is polymer-solvent interaction parameter. Experimental data were tested, with satisfactory results.  
          
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      • Zhou Yan-zhu,Chiang Ying-yen
        Issue 2, Pages: 97-100(1979)
        摘要：A polymer-palladium complex prepared from palladium (Ⅱ) chloride and poly-γ-aminopropylsiloxane suported on fumed silica is very active for hydrogenation of olefins in proper solvents at 30℃ tinder an atmospheric hydrogen pressure. The rates of hydrogenation of olefins by the polymer complex are found to be markedly affected by the palladium content in the polymer complex.  
          
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        发布时间：2021-03-19
      • Chiang Sze-zen,Chen Jing-hong,Li Chuan-yu
        Issue 2, Pages: 101-111(1979)
        摘要：By the use of DTA and TBA，we observed Tgg，Tg，Tc Tm and the relative rigi-dity of p-polyphenylene sulfide．And，by the applieation of TG，DTG and DSC，the kinetics of degradation courses of PPS in air were studied．It showed that the initial degration temperature of PPS was about 400℃ (β=1℃／min)；the process of its degradation Can be divided into two stages：in the first stage, the active material of degradation is the Bnear segment of the polymer ehain in PPS strueture：but in the second stage，owing to the appearanee of condensed aromatic rings and thiocaadensed ring systems．its stability to heat resistancc had been increased，and the actiVation onergy of the degradativn was as hi．gh as 100--105 Keal/mole，the reaction order 1.7，and frequeney factor 1026 sec-1．  
          
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      • Yu Tung-yin,Bao Chi-nai
        Issue 2, Pages: 112-116(1979)
        摘要：The dynamic mechanical properties of double chain polyphenylsilsesquioxane were studied with a torsion pendulum between -150° and 450℃ at 1 Hz. The natures of the loss peaks were investigated by studying the effects of thermal treatment and plasticizer on the shear modulus and damping. We found that the loss peak at -120℃ is due the local movement of the siloxane chain, loss peak at - 40℃ is the characteristic feature of the double siloxane chain, and at 300℃ the decomposition of the double chain begins.  
          
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        发布时间：2021-03-19

        Research Bulletin

      • Voong Sing-tuh,Lu Cheng-xun
        Issue 2, Pages: 117-119(1979)
        摘要：5-Tert-butylpyrogallol as a inhibitor (Ⅳ) was synthesized. It was found, that (Ⅳ) is a powerful inhibitor and its inhibiting effect, compared under the same condition, is about 3 times that of hydroquinone.  
          
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