最新刊期
      卷 ， 期 1 ， 1979

        Research Article

      • Chen Shou-his,LONG Cheng-fen,Hu Shich-rhu,Hsu Mao
        Issue 1, Pages: 1-7(1979)
        摘要：The viscous behaviour and optical properties of poly (-p-phenylene terephthala-mide) (PPTA) in pure sulfufic acid solution have been studied at varied temperatures and concentrations by Hoppler rheometer, depolarized light transmission and small angle light scattering methods. The anisotropic solution of PPTA shows nema-tic as well as cholesteric mesophase characteristics at different temperatures. This means that the liquid crystals of aromatic polyamides possess similar mesophase transition as the low molecular compounds do. Liquid crystals of PPTA in sulfuric acid solution is changed from nematic at lower temperature to cholesteric mesophase at higher temperature. This change does not take place directly from nematic to cho-lesteric and is essentially a monotropic one.  
          
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        发布时间：2021-03-19
      • Yang Shih-hsien,Ho Ping-lin,YU Yao-ting,Lin Chuei
        Issue 1, Pages: 8-18(1979)
        摘要：By means of free radical polymerizations were made the copolymers of acrolein，acrolein-styrene and acrolein-divinyl benzene and the infrared spectra of which were taken．It was shown that polyacrolein contains ether linkage，carbon-carbon double bend earbonyl and hydroxyl groups．When treated either with hydroxyl-amine hydrochlorido or with sodium hydroxide solution，the polyacrolein lost or changed the carbonyl group and ether linkage as shown by infrared spectra．This indicated that both the carbonyl group and ether linkages of acrolein are sensitive．Different compositioEs of the copolymer of acrolein styrene possessed different infrared spectra．Comparatively speaking，the copolymer with a smaller amount of styrene contained a less amount of carbonyl groups and more ether linlmges while those with a higher amount，i．e．，approximately eqnimolecular，of styrene contained a higher。amount of carbonyl groups and a smaHer amount of ether linkages．This is probably due to the fact that the copolymerization of aerolein with styrene might cut down the possibility of cyelization．a-hydroxyphosphonic acids were obtained when polymers of the acrolein．acrolein-styrene and acrolein-divinylbenzene were treated with phosphorus triehloride． After the reaction'mixture had been kept at 20℃ for twenty-four hours，the phosphorus content and exchange capacity of the product approached the maximum value．The reaction took place faster at around 75℃ than that below 75℃．When the reaction was undertaken in a solvent with a higher d4eleetric constant or in a mixed solvent．a phosphoric acid with a higher phosphorus content a better exchange capacity could be obtained．Since the carbonyl groups of the homopolymer and eopolymer of acrolein could not be completely converted to the phosphoric acid by phosphorus triehloride and the remainder of carbonyl groups could undergo Cannizzaro reaction，the products after ha-ring been treated with sodium hydroxide solution usually gave a higher exchange ca-pacity than that of the sample without th is treatment．  
          
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        发布时间：2021-03-19
      • Ho Fu-cheng,Liu Lu-pin
        Issue 1, Pages: 19-30(1979)
        摘要：In this article．the normal distribution is generalized to be a three．parameter pro-bability density function which is called the semi-normal distribution (SND)．The log semi-normal distribution derived from SND is a molecular weight distribution func-tion with a wide range of applications since the graph of this distribution function is represented by a network which covers a vast region containing the curved angular zone formed by Schulz distribution and log normal distribution in the continuum of molecular weight distributions set by W．E．Gloor．The SND has some good eharac-teristics as the normal one thus it is adaptable to GPC results especially more advan-tageous for chromatogram with asymmetric peak．Some useful equations，curves and tabulated values of the special function are in this atticle．With the aid of them the various average moleeular weights ean be easily figured out．It is also possible to calculate the parameters of a distribu-tion from three molecular weight averages．  
          
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        发布时间：2021-03-19
      • Lo Chang-pin,Ko Li-fen
        Issue 1, Pages: 31-35(1979)
        摘要：Hydrolysis of polyacrylonitrile fibers under pressure (15 atm.) at 180-185° C by water gave a copolymer of acrylamide, acrylimide and the ammonium salt of acrylic acid and their homopolymers. The ammonium salt of polyacrylie acid after being dried, was partially decomposed into polyacrylie acid and ammonia. The final product consists of polyacrylie acid, its ammonium salt, polyacrylamide and polyacrylimide in the ratio of ca 13:36:18:33.  
          
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        发布时间：2021-03-19
      • Wang Chien-hua,Liu Hai-chih,Yang Yun-na,Jsao Chiu-chiou
        Issue 1, Pages: 36-40(1979)
        摘要：By treating α. ω-polybutadienyl dilithium with 2-3 equivalents of N-acetyl aziridine in hydrocarbon solvents and the subsequent hydrolysis and separation, the aminoethyl terminated polybutadiene was obtained. The molecular weight and functionality of the product were determined to be about 3000 and around 2 respectively as expected.The total 1,4 units in the main chain was found to be over 90%, and the cis-from accounted to be about one third of the 1,4 units.  
          
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      • Wu Kuan-lee,Wan Duo-yuan,Chiang Ying-yen
        Issue 1, Pages: 41-46(1979)
        摘要：Institute of Chemistry; Academia Sinica  
          
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