最新刊期
      卷 ， 期 5 ， 1980

        Research Article

      • SHI Liang-he,Chai Zhi-kuan,Zhang Xia-mvang,Fu Xiu-cheng,WEN Zai-qing,Chen Guo-qing,Liu Shu-quan,Yao Liu-hong
        Issue 5, Pages: 257-262(1980)
        摘要：The synthesis of GPC packings of St-DVB copolymer of low degree of crosslinking (7%-9%) is discussed in connection with the mechanism of pore formation and the function of the diluents present. It was shown that the nature of the diluents used does not influence the permeation limits of the gels.Several organic compounds were used to calibrate the gels and their hydrodynamic volumes in tetrahydrofuran were equated to those of polystyrene. From the data of gel parameters and their chromatographic characteristics, it can be derived that even in gelsof low degree of crosslinking certain degree of uneven crosslinking is prevailing.  
          
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      • Chen Yihong
        Issue 5, Pages: 263-270(1980)
        摘要：The method of iteration suggested by Han is applied for solving Tung's equation. It is applicable to both constant and variable h's Gaussian kernek as well as Gram-Charlier kernel. It can also be used for correcting peak spreading of narrow molecular weight distribution samples.This method of iteration is comparable to other iterative methods reported in literature as far as the calculating time and the accuracy and precision of solution are concerned.The problem of quadrature formula, normalization, symmetrization and pak spreading correctionfor experimental GPC chromatograms after partial smoothing or fitting a curve is discussed.  
          
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      • YAN De-yue
        Issue 5, Pages: 271-280(1980)
        摘要：The molecular weight distribution of anionic polymerization system initiated by electron transfer and the influence of monomer transfer on the polymerization were treated theoretically. The exact expressions of molecular weight distribution function are derived according to Pepper's kinetic scheme. In the case when vinyl mesitylene is initiated by sodium-naphthalene in tetrahydrofurane, the results of theoretical computations are very close to the experimental data reported.  
          
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      • XU Cheng-wei,Song Xu-bing
        Issue 5, Pages: 281-284(1980)
        摘要：The solvency of the solvents for polymers has been discussed and characterized by thin layer chromatography method.From this study, two groups of solvents with low toxicity have been selected for polychloroprene adhesive.  
          
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      • Zhou Xing-mao,JIA Lian-da,LIU Li,WANG Guo-ying,ZHOU En-le
        Issue 5, Pages: 285-291(1980)
        摘要：In general, bulk-crystallized FEP copolymer possesses spherulitic morphology. The extent of development and perfectness of the spherulites depends upon the molecular structure and crystallization condition of the copolymer. The size of spherulites of the polymer samples studied is in the range of several up to more than one hundred microns. The number of tie chains in the interdomain regions increases with molecular weight and with the decreasing of crystallization temperature of the sample, and has a pronounced effect on its craching behavior. The more the number of tie chains,the better is the service performance of the material. Annealing at a temterature near the melting point may improve the serviceability of FEP copolymer around 200℃.  
          
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        Research Bulletin

      • Wu Wen-bin,Qi Shao-qi,Peng Rong-yin,Li Pan-tong
        Issue 5, Pages: 292-296(1980)
        摘要：Two new expressions having the shape of unsymmetrical functions for describing the X-ray scatter by the amorphous regions in polymer have been worked out.These new expressions have been used successfully in the X-ray multipeak resolution method for the study of the structure of crystalline polymers.  
          
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      • DING You-jun,Tian Xi-shang
        Issue 5, Pages: 297-300(1980)
        摘要：Polysulfone-Nylon 6 block copolymers were synthesized by the interaction of chloro-terminated polysulfone and liquid caprolactam with sodium metal as condensation agent.Block copolymers were characterized by solubility characteristics, infrared spectro-seopy, dynamic mechanical behavior and differential thermal analysis.The presence of the polysulfone block reduced the water sensitivity of homopoly-mer Nylon 6.  
          
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      • Tang Jin-kui,Shen Quan-ao,Fang Ai-mei,Huang Wei,Xu Mao-hua,QI Yu-chen,SONG Yong-xian,CHEN Dong-lin
        Issue 5, Pages: 301-305(1980)
        摘要：A simplified differential scanning calorimeter (DSC) is described. Only two parts which are specific for DSC, ie. heat compensating circuit and sample holder were made by ourselves. Other parts of the instrument are all commercially available units. A sensitivity of 1 meal/sec, and the error in calorimetric determination of about ±5%, were attainable by means of a specific sample chamber design. The working temperature range is from -100℃ to 500℃. Typical diagrams which show the performance of the instrument are illustrated.  
          
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      • Li Li-sheng,Zhang Guang-li,Liu Yi-hua
        Issue 5, Pages: 306-308(1980)
        摘要：The crystallization and orientation of natural rubber under uniaxial drawing were investigated by the electron microscope. From electron microscope and electron diffraction pattern it is revealed that the structure of the fibre from natural rubber is similar to that of the polyethylene fibre. Its basic structural element is also micro-fibril, highly aligned in the draw direction and the microfibril is formed by the folded chain blocks, aligned perpendicular to the draw direction. Thus it seems to be reasonable that the structural model of polyethylene microfibril could be considered as a general model for crystalline fibres of such linear polymers.  
          
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      • Wang Chang-yi,He Hai-ching
        Issue 5, Pages: 309-312(1980)
        摘要：A simple, rapid and accurate method is presented for the micro-analysis of fluorine element in fluoropolymers. Fluoropolymers and CF3-containing organic compounds are quantitatively decomposed and titrated. The titration reaction is a stoichiometric one and has a sharp end-point. The absolute error of this method is ±0.3%. Interferences of SO4=, PO4(?), AsO2- (or AsO4(?)) and CO3(?) can be eliminated by a simple procedure. This method is suitable for microanalysis of F element in C, H, 0, N, Cl Br, I, Si, S,P,As-containing fluoropolymers.  
          
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      • QIU Kun-yuan,Wu Chang-shu,Zhuang Chu-hui,Dai Ling,FENG Xin-de
        Issue 5, Pages: 313-316(1980)
        摘要：Initiation of acrylonitrile (AN) polymerization in the aqueous solution of sodium thiocyanate by different peroxides was studied．It was found that the structure of peroxides play an important role，if TBH or H2O2 was used as initiator．Addition of small amount of NaSCN would act as activator．the induction period will be shortened as the concentration of NaSCN gradually increases．In case of TBH，percentage of conversion would increase at the same time，So TBH．could be applied to both con-centrated NaSCN aqueous solution polymerization and plain aqueous solution polymeri-zation．In case of H2O2，percentage of conversion would decrease at the same time，so H2O2 could be applied only to aqueous solution polymerization but not to coneen-trated NaSCN aqueous solution polymerization．Within the temperature range of 30-50℃，activation energies of TBH and H2O2 in initiating aqueous polymerization of AN in the presence of some NaSCN were determined to be 63.6 and 66.9 KJ.mol-1 respec-tively．For KPS，the presence of NaSCN would always show its inhibition effect in increasing induction period and lowering percentage of conversion．  
          
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      • MO Zhi-shen,YU Wen-hui,LIU Li,Han Ping
        Issue 5, Pages: 317-320(1980)
        摘要：The degree of crystallinity and lattice parameters of FEP copolymers polymerized with different methods and with various hexafluoropropylene contents were determined by X-ray diffraction method. Studies were also made on their density, melting point, heat of fusion and composition.It is shown from our results that the monomeric sequences of hexafluoropropy-lene are more uniformly distributed in the molecular chains of the copolymers obtained by emulsion and dispersion polymerization than that obtained by suspension poly-merization.  
          
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