最新刊期
      卷 ， 期 5 ， 1979

        Research Article

      • Wang Ming-jin,YANG Yu-liang,Yao Jing-fang
        Issue 5, Pages: 257-265(1979)
        摘要：4-chloro，4-hydroxydiphenylsulphone was prepared by the hydrolysis of 4，4’-dichlorodiphenylsulphone with sodium hydroxide in the presence of the solvent DMSO．When the molar ratio of DDS/Na0H equal to 1：2.5 the hydrolysis will be eompleted．The contents of 4，4’dihydroxydiphenylsulphone and 4，4’-dichlorodiphenylsulpllone in 4 ehloro，4-hydroxydiphenylsulphone were determined．Then according to analytieal results，4，4’-diehlorodiphenylsulphone was added to the system of the eopolycondensatibn at different molar ratio of (Cl)/(OH) and then copolycondensed respectively．Inthe system，the end．groupsofthethreemonomers (NaO SO2 一Cl (I)，NaO--◇一SO2—ONa (Ⅱ) ana Cl——SO2--Cl (III) exhibit~ifferent reactivities．Reactivity of the sodium phenoxide-end-group is (II)>(I)，while reactivity of the chloride-end．group is (III)>(I)．In the copolycondensation the difference in molar ratio of the three monomers has noticeable effect not only on the initial eopolycondensation rate，but also on the proper-ties of polymer vbtained，and in case of (Cl)/(OH)>1 the polymer obtained will possess best properties．  
          
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        发布时间：2021-03-19
      • XU Ji-ping,Ni Yu-shang,Wen Jiu-mian,Zhang Jin-Ian,Zhang Ze-yi,Qu Xian-zhi,Shu Ju-ping
        Issue 5, Pages: 266-273(1979)
        摘要：A detailed study on the solution polyeondensation of dipotassium salt of 4，4’-dihydroxydiphenylsulfone and 4，4’-diehlorodiphenylsulfone is performed．Sulfolane is chosen as polycondensation medin while mixed xylene is used for azeotropic removal of water during the formation of dipotassium salt．Effects of polycondensation tempera-ture。time and solid content have been studied．Influences of monomer ratio and ratio of alkali to bisphenol-S during salt formation on product molecular weight have been discussed and a method is proposed for reducing the amplitude of fluctuation of pro-duct molecular weight by addition of potassium carbonate besides potassium hydroxide during salt formation．Factors influencing heat stability of polyarylsulfone at process-ing temperatures are discussed．and method for quality control of the after treatmentst ep has been recommended．The chief properties of PAS obtaJned are also listed．  
          
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      • ZHANG Bai-lan
        Issue 5, Pages: 274-278(1979)
        摘要：The morphology of the free surface of PEP copolymer samples was observed with TEM. It is shown that the morphology of the free surfaces of different samples varies one from another. Some consisted of "random lamellae", while others consisted of both "random and regular lamellae". The structural nature of these two kinds of lamellae is discussed and is shown by other experimental evidence. The mechanical properties of the samples predicted on the basis of this consideration are in accordance with experimental results.  
          
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      • Chen Gang
        Issue 5, Pages: 279-284(1979)
        摘要：The copolymerization of 1,1,5-trihydro-oetafluoro-1-pentyl glycidyl ether with tetrahydrofuran was carried out by use of BF3·O(C2H5)2 as catalyst in the presence of diethylene glycol．The products isolated from the copolymer have been studied by gas chromatography，thin-layer chromatography，IR-，and NMR-spectrometry and have been found to contain a low molecular weight compound having an ethoxy group which is produced due to the presence of small quantity of ether introduced into polymeric system by the catalyst．At the same time，monohydroxylcopolymers with ethoxy group have also been formed．Similar copolymerization were carried out by use of BF3·O(C4H8) instead of BF3·O(C2H5)2，it is found that the monohydroxylcopolymer is less in quantity in the obtained copolymer．  
          
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      • Lu Qi-hao,Zheng Guo-xiu,Liang Wen-zhong,FENG Han-bao,Sun Euo-na,Hou Xiao-huai,Zhou Xiang-feng,Su Bing-lu,ZHAO Rui-nian,Shen De-kang
        Issue 5, Pages: 285-290(1979)
        摘要：2,2,6,6-Tetramethyl-4-piperidinylmethacrylate was prepared by ester-exchange reaction between 2, 2, 6, 6-tetramethyl-4-piperidinol and methylmethacrylate. The resulting ester was copolymerized with styrene, and the copolymer was blended with polypropylene in quantities of 1.5-5%. The polyblends thus obtained were spun into fibers with a tenacity of about 4g/d. The modified fibers have a good resistance to weathering, and good dyeing ability with azo-type dispersive dyes. At the same time the spinning temperature of the polyblends was lowered to around 280℃.  
          
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      • Li Li-sheng,Nie Zong-wu,Liu Zhong-chun
        Issue 5, Pages: 291-297(1979)
        摘要：The whole deformation process of polyethylene spherulites from spherulitic to fi-brillar structure during uniaxial drawing was investigated under electron microscope. From electron microscopy and wide and small angle electron diffraction pattern it i8 demonstrated that the folded chain blocks aligned perpendicular to the draw direction are further incorporated into micro-fibrils highly aligned in the draw direction. These micro-fibrils are the basic structural elements of polyethylene fibre.  
          
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      • SHI Guan-yi
        Issue 5, Pages: 298-304(1979)
        摘要：Attemps have been made to establish the interrelations between composition distribution and melting endotherms of crystalline copolymers. Several basic equations have been obtained theoretically from the thermodynamics of copolymer crystals and its melt, and parameters of these equations have been measured empirically in the case of FEP copolymers. On the basis of these relations the melting endotherms can be converted to the composition distributions. Some preliminary results on composition distribution of FEP copolymers were given. It is founded that thecopolymers with broad distributions have a poor stress-cracking resistance.  
          
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        Research Bulletin

      • Xu Mao,Zhang Hong-en
        Issue 5, Pages: 305-308(1979)
        摘要：The data treatment in viscosity measurement by tensile creep method was discussed. A method which may be used for polymer samples with high viscosity and low modulus was proposed. The measurements of two poly-cis-1,4, butadiene samples showed that due to the difficulty to avoid wholly the influence of elastic deformation during the creep process of these samples, the previous method which was based on the assumption of the establishment of a pure steady flow state would deviate the viscosity values to one order of magnitude lower.  
          
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