最新刊期
      卷 ， 期 1 ， 1980

        Research Article

      • He Fucheng
        Issue 1, Pages: 1-9(1980)
        摘要：By generalizing the method adopted by the authors (Sun and Ho[10]), a general equation for calculating the mean square electric dipole moments and the mean square lengths of polymeric chains has been derived on the basis of restricted, but independent internal rotations. This equation is as follows:where Bi,m = …, Ti is the axis transformation matrix relating coordinate systems of consecutive skeletal bonds, [x/y] represents the integral part of x/y, m is the period of transformation.The general equation holds for n.m as n is sufficiently lareg it may be trans-formed into the following form.  
          
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        发布时间：2021-03-19
      • YU Tongyin,Wang Lihui,Bu Haishan,Li Haisheng,Zhao Yanlai
        Issue 1, Pages: 10-15(1980)
        摘要：The bulk photopolymerization of methyl methacrylate at 30℃ was studied. In case of stronger light intensity, the rate of polymerization is no longgr proportional to the square root of light intensity. And a plot of the reciprocal of viscosity-average degree of polymerization against rate of polymerization is an upward curve rather than a straight line. These results are discussed in terms of primary radical termination reactions.By comparing the data of the photopolymerization of methyl methaerylate at 30℃ with those of benzoyl peroxide initiated polymerization at 60℃,it clearly shows that primary radical termination is more important at lower temperature than at higher temperature.  
          
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        发布时间：2021-03-19
      • XIE Hong-quan,Zhu Jiang,Liu Xiu-xiang
        Issue 1, Pages: 16-21(1980)
        摘要：The terpolynlerization of epichlorohyd rin，ethylene oxlde and propylene oxide with triisobutylaluminium．phosphoric acid-nitrogen．containing electron donor as cata-lyst has been studied．It is shown that as the third eomponent of the catalyst di-methylaniline is the best，tetramethylthiuram disulfide or triethylamine the next．and benzothiazole the worst．While pyridine is used as the third component of the catalyst，the inherent viscosity of the terpolymer obtained is low The catalytic acti-vity is higher when water is presefit in equal moles to phosphoric acid．It is indicated that at the beginning of the terpolymerization ethylene oxide and propylene oxide polymerize more quickly and epichlorohydrin polymerizes slvwly．With increase of propylene oxide in the monomer mixture，the inherent viscosity of the terpolymer decreases and the glass transition temperature passes through a minimium value．  
          
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        发布时间：2021-03-19
      • Hou Xiao-huai,Pan Yu-xiang,Shen De-kang
        Issue 1, Pages: 22-26(1980)
        摘要：When polypropylene is compounded with 0.01%-0.1% 4-hydroxy 2,2, 6, 6-tetra-methyl-piperidine-1-oxyl, the rheological properties of the melt of polypropylene are modified, so that the temperature of spinning can be lowered from 330℃ to 280℃ and the fiber obtained has a tenacity of 5g/d.  
          
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      • ZHOU En-le,Xu Bai-ling,JIA Lian-da
        Issue 1, Pages: 27-34(1980)
        摘要：The morphology of high cis-1，4-polybutadiene crystallized at low temperature and the change of morphology at room temperature with the content and structure of sol and gel．and with different degree of extension and different time of relaxa-tion were studied with electron．and optical microscope．It is shown that the supermolecular strutture of the amorphous cis-1．4-polybuta-diene rubber at room temperature is not homogeneous,but consists of domains with certain regularity．Its fundamental structure units are nodulc，aggregation of no-dules and cluster of gel．The structure units and the junction between them are dependent upon the molecular weight and the gel content of the samples；and in turn the extension and relaxation behaviour of the rubber samples depend on their supermolecular structure．  
          
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        发布时间：2021-03-19
      • Hu Shi-ru,Xu Mao
        Issue 1, Pages: 35-44(1980)
        摘要：The morphology of spherulite and mat-crystal structure in PPTA films coagulated from pure sulfuric acid solutions under different conditions has been studied by light scattering method．Unlike flexible chain polymers，the molecules of PPTA may aggregate not only to form the spherulites．but also some anisotropic rod-like domains at the same coagula-tion conditions．The results of infrared dichroism indicate that molecules within mat-crystal strut-ture are highly oriented in the shearing direction (i.e．direction perpendicular to the band). According to the angular (angle bctween shearing direction and polarization direction of the analyzer) dependence of grating diffraction effect we suggest that the alternate change of brightness of paralleUy arranged bands in tile mat-crystal structure js primarily due to the slight difference in orientation direction of molecules within these bands．A method for calculating the number average long period (Pn) of the mat-crystal structure and the orientaticn of the bands from the d4ffraction pat-terns is proposed，and has been used successfully in characterization of PPTA films．Based on the light scattering studies of thin layers of the PPTA pure sulfuric acid solutions we have found that the mat．erystal structure is formed originally in the anisotropie PPTA solutions under shearing．After rapid coagulation of these layers the mat-crystal structure may be fetalned in the films obtained．  
          
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        发布时间：2021-03-19
      • Lu Xi-ci,Luo He-zhang
        Issue 1, Pages: 45-50(1980)
        摘要：An experimental method and its related principle using convergent polarized light for determining the birefringence of biaxially hot-stretched acrylics were presented. The equation proposed by M. J. Kramer has been simplified by the authors. The relationships between birefringence and percentage of stretch, stretching temperatures were studied and interference patterns were examined.  
          
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        发布时间：2021-03-19

        Research Bulletin

      • Jiang Er-fang
        Issue 1, Pages: 51-54(1980)
        摘要：A simple and quick method for the determination of the molecular weight distribution of poly (ethylene terephthalate) at room temperature by GPC is proposed, by first preparing an o-chlorophenol (100℃) solution of the sample, then dilute it with chlorform to form a stable new solvent system. Single chloroform is used as an eluent in GPC.  
          
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