最新刊期
      卷 ， 期 3 ， 1987

        Research Article

      • LI Fu-hua,HE Jia-jun,WEN Xiao-lin,LU Su-huan,PENG Yin-cheng
        Issue 3, Pages: 161-165(1987)
        摘要：Activity coefficients of toluene and n-decane at infinite dilution in polystyrene solutions at 130°-200℃ are determined by GC method. For both systems at 130°-201℃, the relation between γ(0) and Z is: In γ(0) = a ln Z + c, where a≈-1. For φCH3-PSt system at 170°-201℃, we get: 1+x = 4.857/Z +0.7560, where x is the Flory-Huggins Parameter. The result shows that these two systems are nearly athermol solutions.  
          
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      • HAN Xiao-zu,ZHANG Bo-lan,ZHANG Zhao-mou,ZHANG Xi-tian,LIU Shu-hai
        Issue 3, Pages: 166-170(1987)
        摘要：Block polymer of alternating copolymers, poly [(St-a-MA)-b- (IP-a-MMA) -b- (St-a-MA)] (I), has been synthesized in the presence of AlEt1.5Cl1.5 by using Mn2(CO)10-CBr4 initiation system. The GPC results indicated that there is no unreacted prepolymer in I purified by precipitation.The study of NMR showed that every block of polymer I has alternating structure. The dynamic mechanical properties of I measured by torsional braid method indicated that the polymer has two Tg, being 38℃ and 75℃, respectively. The transmission electron micrographs of I showed they have two phase stucture and the domain size indreases with increasing molecular weight of hard black.  
          
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      • YE Mu,CHEN Jie,LU Li-zhen,CHEN Chuan-zheng,YUE Jin
        Issue 3, Pages: 171-176(1987)
        摘要：In a capacitively coupled discharge with external electrodes, Ar, N2, H2 or He was used as plasma gas, polymerization of octafluorocyclobutane was carried out under different conditions by varying discharge power, pressure, plasma gas and plasma-gas/monomer ratio. Structure of polymerized products was characterized by IR spectroscopy and ESCA measurement. It was determined that there were six elements in the products, i.e. C, F, Si, O, N and H. The probably existed groups in the polymers were investigated. By analyzing the resolved peaks of C18 region in ESCA spectra,effect of the reacion condtions on degree of branching and cross-linking of the polymerized products was discussed.  
          
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      • QI Lu,CAO Zhen-lin
        Issue 3, Pages: 177-183(1987)
        摘要：After heat-setting of PET woven fabric at different temperature, the dynamic mechanical properties of fabric sample and its warp- and weft yarns have been measured by means of Rheovibron DDV-II-EA Dynamic Viscoelastometer.It was found that the dynamic mechanics-temperature spectra of fabric and its yarns were completely different from that of original fibers. On the [E] -T curves exhibited [E] peak, the [E]max value exponentially decreased with increasing of heat-setting temperature and the position of [E]max shifted towards igher temperature. At the same timem on the E''-T curves appeared double loss-modulus peak. The activation energy difference of corresponding relaxa-tion transition was up to half order of magnitude. A tentative analyse has been made to explain above mentioned phenomena. It was consi-dered that such phenomena were directly related to the weaving process and the condition of heat-setting.  
          
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      • JIAO Shu-ke,JIANG Jian,YU Ding-sheng
        Issue 3, Pages: 184-189(1987)
        摘要：The mechanism of the copolymerization of BF3 complexed ethyl acrylate with propylene in the presence of AIBN at 25℃ were investigated. When [EA-BF3] /[EA-BF3] +[P] >0.5, the copolymerization follows the mechanism of the randon copolymerization of the ternary complex with binary complex, obtaining the acrylate-rich random copolymer. When [EA-BF3] /[EA. BF3] +[P]≤0.5, the copolymerization follows the mechanism of ternary complex homopoly-merization, obtaining the alternating copolymer.  
          
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      • ZHANG Xue-xin,MA Zhi-yi,LU Hong
        Issue 3, Pages: 190-195(1987)
        摘要：The molecular weight of Utea Modified Sulfonated Phenol Formadehyde Resin (spu) was determined in its aqueous solution by dynamic membrane osmometry．Considering the proper-ties of water．the raising line of H-dV/dt．which was drawn out near the estimated equilibrium point，was chosen as a standard for obtaining the molecular weight of the sample．The second virial coefficients A2 of SPU found by this method were larger than that of the statistical coil．Z3／C2’calculated from A2 is a parameter characterizing the effective charge of the polyion．The value of Z2／C2’were consistent with the depressions of the water-]oss of the SPU-treated drilling mud，i.e.，the greater the Z2／C2’the better the depression is．The value of Z2/C2'may have certain meaning.  
          
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      • ZHANG Zhao-mu,YANG Guo-jun
        Issue 3, Pages: 196-200(1987)
        摘要：In this paper a new method for estimation of weight average molecular weight of polymer from mere intrinsic viscosity and GPC chromatogram of the sample was proposed. The method can be applied to narrow as well as broad distribution sample of polymers for which the constants of Mark Houwink equation are unknown. The metnod was tested using seven samples which have very different molecular weight distribution. The results calculated by the method are in excellent agreement with those obtained using universal calibration method which requires known constants of Mark-Houwink equation.  
          
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      • FANG Tian-ru,LIU Zhao-yan
        Issue 3, Pages: 201-205(1987)
        摘要：This paper involves the examination of refractive index increments and UV absorption spectra of styrene-isoprene diblock copolymers in CHCl3. It is found that the block copoly-mers, just as with the blends of corresponding homopolymers, have good An/Ac additivity, indicating that dn/dc measurement can be used to determine the composition of block copolymers. On the other hand, the results of UV absorption spectroscopy show that block copolymer samples exhibit marked UV hyperchromism, except one sample with low polystyrene content. The-refore,UV,and UV-RI dual detector GPC will yield unreliable composition data of the block copolymers. The hyeperchromic phenomena of these block copolymers are closely related to their peculiar UV absorption spectra observed.  
          
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      • LIU Lian,GU Ming-chu,YING Sheng-kang
        Issue 3, Pages: 206-211(1987)
        摘要：In the present paper, kinetic and microstructural data obtained from the anionic polymerization of butadiene initiated with n-BuLi/2G in cyclohexane were handled. A kinetic model is then set up and a polymerization mechanism is suggested. The propagation rate constants of monomeric, monoetherate and dietherate complex and the equilibrium constants between those species were calculated and the contribution of different reactive species to the formation of vinyl group in polybutadiene was also evaluated.  
          
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      • LIU Xiao-ming,ZHVO Hua-shan
        Issue 3, Pages: 212-216(1987)
        摘要：Phase structure and molecular structure of Poly (etheneco-vinyl acetate-g-vinyl chloride) (EVA-g—VC) have been studied in this paper EVA-g-VC consists of free EVA．PVC homopoly-met and EVA-VC copolymer，in which EVA exists as a continuous phase and PVC particles disperse．The size of PVC particles and the grafting efficiency of EVA all depend on the feed-ing ratio-VC／EVA (wt／wt) of a graft polymerization．With decreasing the feeding ratio in the graft gel，the Tg of EVA increases，while the molecular weight and PVC content all decrease．One explanation for this could be suggested that the number of VC grafting points in EVA-VC increases with decreasing the feeding ratio．EVA-VC as an adhesion agent exists between two incompatible phases-EVA(-14) and PVC，which makes the Tg(EVA) and the Tg (PVC) near to another．  
          
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      • CHEN Qu-sheng,ZHUO Ren-xi,ZHOU Nian-en
        Issue 3, Pages: 216-221(1987)
        摘要：Twelve new polyphosphates were synthesized by reacting the monomers, i.e. N,N'-di(ω-hydroxyalkyl)-5-fluorouracil-1,3-diacetamide, N, N'-di(ω-hydroxyakyl)uracil-1,3-diacetamide, N, N'-di(ω-hydroxyalkyl) thymme-1,3-diacetamide, with bis-(2-chloroethyl) phosphoramidic di-chloride or ethyl dichlorophosphate. The antitumor activity of some of these polymers were tested against EAC, HSC and S18v in mine. The polyphosphates containing both 5-fluorouracil and nitrogen mustard exhibit higher antitumor activity. The inhibition ratio of polymer (IVb)against Ehrlish ascites reaches 60% The relationship between the component of the polymers and the antitumor activity were also discussed.  
          
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        Research Bulletin

      • LU Dao-hui,XIE Ping,BAO Jing-sheng
        Issue 3, Pages: 222-225(1987)
        摘要：The thermal properties of the series of mixed diphenolterephthalate copolyesters were deter-mined by Differential Scanning Calorimetry (DSC) and Thermogravimetry (TG). The effe-cts of molecular structure and thermal history on both DSC and TG curves were studied.  
          
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      • LOU Xia,LIU Zhen-hua,ZHUO Ren-xi
        Issue 3, Pages: 226-229(1987)
        摘要：In this paper, we wish to report the preparation of three new αH, αH, ωH-perfluoroalko-xypropylmethyldichlorosilanes, e.g. 1H, 1H, 3H- perfluoropropoxypropylmethyldichlorosilane, 1H, 1H, 5H-perfluoropentoxypropylmethyldichlorosilane and 1H, 1H, 7H-perfluoroheptoxypro-pylmethyldichlorosilane. Upon hydrolysis or cohydrolysis of these fluoroalkoxypropylmethyldt-chlorosilane monomers with dimethyldichlorosilane, seven αH, αH, ωH-perfluoroalkoxypropyl-methylcyclotetrasiloxanes were obtained. The chemical structures of these new organosilicon com-pounds were confirmed.  
          
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      • SHE Wan-neng
        Issue 3, Pages: 230-233(1987)
        摘要：AZO-Containning polytetrahydrofuran (AZO-PTHF) was synthesized by the cationic ring-opening polymerization of THF, using 4,4'-azobisisocyanovaleryl chloride as initiator and antimony pentachloride as catalyst. The polymer could form macromolecular free radical and initiate some vinyl compounds polymerization by thermal decomposition of AZO group. The radical of PTHF was identified by means of ESR determination and the decomposition temperature was also obtained.  
          
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      • PAN Jiang-qing,ZHOU Xiang-feng,WU Yong-yang,MA Zhen-min,ZHAO Rui-nian
        Issue 3, Pages: 234-237(1987)
        摘要：A new polymeric hindered amine light stabilizer-copolymer from propylene and 2,2,6,6-tetramethyl-4-piperidinyl maleate (P1) has been prepared by two steps. Based on the elemental analysis and 13C-NMR, 1H-NMR, IR, the structure of the product (P1) has been illustrated.The decomposition temperature of P1 is 220℃ which is about 100℃ higher than that of the small molecule hindered amine TMP (2,2,6,6-tetramethyl-4-hydroxy piperidine). P1 shows having a good photoprotecting effectiveness. The mechanism of photostabilizing action of P1 is by was of forming nitroxy stable free radical.  
          
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      • ZHANG Jian-ke,WU Shi-kang,WANG Er-jian
        Issue 3, Pages: 238-240(1987)
        摘要：In this work, bulk photopolymerization of methyl methacrylate (MMA) initiated by 3-ben-zoylcoumarin (sen. l)/triethylamine (TEA) coinitiator has been studied. Results comparing with a well known initiating system-benzophenone (BP)/TEA are discussed.  
          
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