最新刊期
      卷 ， 期 4 ， 1987

        Research Article

      • LIU Xiao-ming,ZHAO Hua-shan
        Issue 4, Pages: 241-246(1987)
        摘要：The torque curve of PVC/EVA(-14) or PVC/EVA(-14) gVC, obtained with a temperature programmable Brabender Plasticoder, gives two peaks which indicate the melting of EVA and PVC respectively, and is accompanied with three steps of morphology varying: (1) EVA fusion-PVC grain breaking, (2) EVA continuous phase-PVC agglomerate disaggregating, (3) EVA particles-PVC primary particle melting. With decreasing the feeding ratio (VC/EVA) of a graft polymerization, the melting temperature and melt viscosty of EVAgVC increase and the first torque peak approches to the second. Results shown above indicate that EVAgVC is more compatible and more mixable with PVC than EVA. It has been shown that blends with the structure of EVA networks-PVC primary particles have the highest impact resistance. EVAgVC produced under a small feeding ration is able to remain PVC EVAgVC blend a EVA network structure in a wide processing temperature range which makes the blend possessing a high impact strength.  
          
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      • ZHANG Qi-ming,ZHU Qing-qing,WU Shi-kang
        Issue 4, Pages: 246-251(1987)
        摘要：The photophysical behavior of a new type triplet sensitizers-N-methyl-2-aryloylmethyiene-β-naphthiazoline has been studied in this work. The absorption spectra, quantum yield of fluorescence and phosphorescence of these compounds have been measured. It was found that the sensitizers studied have higher molar absorption coefficient (104) than that of the usual sensitizers. In addition, they have high inter-system corssing efficiency. In the presence of different sensitizers, we measured the rate of photoisomerization of t-stilbene to cis-stilbene as a method for evaluating the efficiency of these compounds. Results indicated that the new type of sensitizers is an efficient one.  
          
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      • ZHUO Ren-xi,LIU Gao-wei,ZHOU Yuan-zhong
        Issue 4, Pages: 252-257(1987)
        摘要：A new type of nucleic acid analogs with polysiloxane backbones is reported in this paper. Four new organosilicon monomers containing nucleic acid bases or 5-fluorouracil, i.e., γ-(N1-uracilyl) propylmethyldiethoxysilane (1), γ-(N1-thyminyl) propylmethyldiethoxysilane (2),γy-(N9-adenyl) propylmethyldiethoxysilane (4) anr-(N15-fluorouracilyl) propylmethyldiethoxysilane (3), were prepared by the alkylation of γ-bromopropylmethyldiethoxysilane with uracil, thymine, adenine and 5-fluorouracil, respectively. The polymerization of these monomers,in-cluding the copolymerization of (1) with diacetoxydimethylsilane (5),or 1,3-bis (acetoxy-1,1,3,3-tetramethyldisiloxane (6),were carried out under different conditions. Thus,a variety of ho-mopolymers and copolymers were obtained with polysiloxane structure as the main chain and nucleic acid base as the pendant group. The monomers and polymers were structurally identi-fied by 1H-NMR,IR.UV and elemental analysis. The [n] and Mn of the polymers were also determined.  
          
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      • QIU Kun-yuan,YANG Ying-fei,FENG Xin-de
        Issue 4, Pages: 258-264(1987)
        摘要：The effects of hindered amines, such as 2,2,6,6-tetramethyl-4-hydroxy-piperidine (TMP)> 2,2,6,6-tetramethyl-4-piperidinyl methacrylate (TMPM), TUV-770, on methyl methacrylate (MMA) and styrene (St) homopolymerization have been studied. It was found that in the MMA polymerization initiated by benzoyl peroxide (BPO) or 2,2'-azo-bis-isobutylonitrile (AIBN), the presence of TMPM or TUV-770 delayed the induction period and a little change on Rp was observed. However, in the presence of TMP Rp increased slightly. The activation enrgy of po-lymerization was datermined, and the polymerization rete equation for BPO-TMPM system is obtained as followe: Rp=K[BPO]1/2[MMA].  
          
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      • ZHOU Xin-hua,ZHOA Zhe-he,LU Yun,LIN Shang-an
        Issue 4, Pages: 265-270(1987)
        摘要：A novel highly active catalyst of TiCl4/MgCl2-Al(C2H5)3 system (called SN-1 catalyst, in which rare earth NdCl3 compound is included) was used for studying stereospecific polymerization of styrene in benzene solution, Highly isotactic polystyrene was prepared with far better yield and higher catalytic efficiency than the results ever reported in literatures. The influences of concentration of monomer, catalyst, trialkyl aluminum as well as polymerization temperature on the catalytic efficiency, yield, tacticity and molecular weight of polystyrene has been investigated.  
          
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      • ZHUO Ren-xi,FAN Chang-lie,MAI Cai-song,ZHAO Ru-lin,YI Jin
        Issue 4, Pages: 271-275(1987)
        摘要：Six polyamides containing 5-fluorouracil in the side chain were synthesized by the condensation of di-p-nitrophenyl N-(5-fluorouracil-l-acetyl)-glutamate with a series of polymethy-lene diamines. All of the new polyamides obtained are solid powder and soluble in water. Their chemical structures were identified by 1H-NMR, UV and IR spectra as well as elemental analysis. The antitumor activity of some of these polyamides were tested against Ehrlich ascites carcinoma in mice. Poly [ethylene α-(5-fluorouracil-l-acetyl-amino) glutaramide] showed an inhibition rate of 43%.  
          
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      • YIN Jing-hua,MO Zhishen,JI Feng,HUANG Bao-tong,LIU Jin-qiang,LI Mao-xin
        Issue 4, Pages: 276-280(1987)
        摘要：Studies were carried out on interfacial penetration of EPDM and amorphous portion of PP in EPDM/PP blends. Observations made with torsion pendulum, differential scanning calo-rimetry and wide-angle x-ray diffraction indicated that, though no compatibility between EPDM and PP, there existed interfacial penetration and thus partial interfacial compatibility between two amorphous phases. X-ray diffraction studies revealed that unit cell dimensions of PP did not change in the presence of EPDM. The influence of effective network chain density on mechanical properties of usual rubber vulcanizates did not apply in the case of vulcanized EPDM/PP blends.  
          
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      • LIU Sheng-ping,QIN Wen
        Issue 4, Pages: 281-286(1987)
        摘要：Molecular weight, molecular weight distribution and branching factor of cis-polybutadiene-rubber (BR) were measured by GPC-Automatic viscometer method and the viscosities of concentrated solutions of BR were measured by coaxial cylinder viscometer and falling-ball method. The effects of molecular weight distribution and long-chain branching on non-Newtonian flow of concentrated solutions of BR were studied. A simple formula which describes theviscosity shear rate dependence of these solutions is obtained, and the effect of long-chain bran-ching on non-Newtonian flow of concentreated solutions of BR are discussed.  
          
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      • SUN Ruo-na,WU Yong-yang,Chai Zhi-kuan
        Issue 4, Pages: 287-291(1987)
        摘要：The interactions of polyethylene glycol (PEG) with some solvents were studied by inverse gas chromatography with surface-treated porous silica as the support material. The retention volume of solvent probe was determined after considering its dependence on the coverage of PEG on the support. The interaction parameters so far obtained were found to be in good accordance with the literature data from static measurements and reflect some characteristic points of the interactions between PEG and solvents.  
          
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      • YU Yi-shan,XU Xi,LI Hui-lin
        Issue 4, Pages: 292-298(1987)
        摘要：PEO-AN block copolymers were synthesized in aqueous solution by using ultrasonic technique. The polymerization of AN was initiated by macroradicals produced during ultrasonic degradation of PEO. The rate of reaction was proportional to AN concentration, and the amount of AN copolymerized with per mole of PEO increased with the degradation rate constant of PEO. And the structure of the copolymers was identified by lelementary analysis, IR, POM, TEM, DSC and WAXD.  
          
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      • HU Xiao-dong,WANG Fo-song,ZHAO Xiao-jiang,YAN De-yue
        Issue 4, Pages: 299-305(1987)
        摘要：Effect of various catalyst systems, catalyst concentration and polymerization conditions on the catalytic efficiency (f) and molecular weight (Mn) of polyacetylene (PA) was investigated, it is found that larger amount of soluble fraction (q) of PA was obtained by catalyst systems Nd(i-OC3H7)3-AlR3 (R = C2H5-, i-C4H9). The catalyst concentration, Al/Nd molar ratio and polymerization temperature exert an influence on the f, Mn and q. UV spectra of soluble catalyst systems Nd(i-OC3H7)3-AlR3 confirmed that the valence state of Nd remains unchanged af-ter mixing it with AlR3.Results of IR spectra of PA showed that polymer obtained with Nd (i-OC3H7)-Al(C2H5)3 and Nd(i-OC3H7)3-Al(i-C3H9)3 contained CH3CH2-- and (CH3)2 CCH2-- end group respectively. The above mentioned results and the fact that CH2=CH-- end group was observed for polymers indicated that polymerization of acetylene with studied catalysts might be carried out through insertion of monomer between Nd-C bond.  
          
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      • HU Xiao-dong,WANG Fo-song,ZHAO Xiao-jang,YAN De-yue
        Issue 4, Pages: 306-311(1987)
        摘要：The structure and properties of soluble polyacetylene (PA) obtained with rare-earth catalyst are thoroughly investigated by UV, IR, Raman spectroscopes, ESR and X-ray diffraction. The soluble PA is different with film and powder PA in their spectra and ESR, which arises from the fact that the average molecular weight of the former is much lower than that of the latter. The experimental results indicate that linear PA usually has a critical average molecular weight for solution, and the soluble PA show some specular properties because its average mole-cular weight is below the critical value.  
          
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        Research Bulletin

      • RAN Rui-cheng,HUANG Jin,SHEN Ji
        Issue 4, Pages: 312-316(1987)
        摘要：Dry beads of polystyryl weak basic anion ex-change resin (commercial, 16-50 mesh, exchange value ≥ 5 mtnol/g, activated groups -NH2,-NH-) are conbined with titanium tetrachloride in chloroform to form a stable complex containing 36.8% of chlorine which correspond to 2.59 mmol TiCl4/g complex beads. The complex can be used to catalyze a lot of organic reactions in high yield, such as esterifications, acetalizations, ketal formations and etherification, and can be reused.  
          
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      • LIN Sen-hao,SHENG Kang-long,BAO Jin-rong,RONG Ting-wen,ZHOU Zhi-yi,SHEN Zhi-quan,YAN Mu-jie
        Issue 4, Pages: 317-320(1987)
        摘要：Ion implantation for doping of polyacetylene film is described. An ion implanter is used for implantation and the conditions for potassium implantation are: ion beam energy 10-30 KeV, fluence 1×1015-1×1017 ions/cm2, and beam current about 2μA. The pristine (CH)x film emerged a little of p-type semiconductor characteristics because of residual catalyst or oxygen. Apparent doping effects were observed in those films implanted with K ions as a n-type electron-donating dopants. Current-voltage characteristic of a p-n junction produced and the resulting diode characteristics are stable for more than a week in the open air. The depth pro-file of implanted K ions in a polyacetylene film obtained by Rutherford Backscattering Spe-ctrometry (RBS) shows a Gaussian distribution centred around a few thousand A.  
          
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