最新刊期
      卷 ， 期 1 ， 1997

        Research Article

      • HU Jiacong,CHEN Shaohua,SHAO Nianci
        Issue 1, Pages: 1-7(1997)
        摘要：The work is to investigate the effect of the stretching and recovery processes on the microstructure,orientation texture and superstructure of hard elastic polypropylene (HEPP) fibers by FRS XRSA and SAXS.The results show that strain induced crystallization,but when ε ≥30%, X W C approaches a conatant,～90%;strain induced the fragmentation of crystallites;strain induced the lamellae separation in parallel,not induced leaf spring bending,i.e.as ε increases,the orientation distribution of crystallites does not change;when ε≤30%,the lamellae separation is the main process,when ε>30%,the lamellae layers occur fracture and slip along the fiber-axis,thus,before and after ε=30% the atrain mechaniem of the hard elaticity is different;strain-induced microvoids in HEPP,but as ε≥20%,the microvoids'size approaches a definite value.These results have successfully been used to interpret the relationships between the structure and properties of HEPP.  
          
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        发布时间：2021-03-19
      • YANG Shikun,YOU Feiyue,CHEN Yujun
        Issue 1, Pages: 8-13(1997)
        摘要：The coupling reaction kinetics of BOZ on the Poly (ethylene terephthalate)(PET) have been studied by intrinsic viscosity( ) and carboxy value( CV ).The experimental results show that the reaction occurrs between the BOZ and the carboxy group of PET.Effect of chain extension on the PET produced by different technology and factory have been investigated.These results show that the accessihle maximum of products depend on /CV of PET samples.  
          
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      • CHEN Xiaohong
        Issue 1, Pages: 14-18(1997)
        摘要：A slipknot polymer network model based upon the fuzzy constraint method is put forward in this paper.The local concentrated entanglement effects are quantitatively manifested by introducing the constraint tensor and membership function,and a random tetrahedral slipknot cell is chosen as the average representative unit of the network structure.By making use of the theory of fuzzy probability and statistical mechanics,the expression for the free energy of deformation is obtained,which can be simplified to the formula given by Ball-Edwards'slipknot network model.  
          
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      • PENG Yuxing,LIU Jialin,DAI Hansong,CUN Linfeng
        Issue 1, Pages: 19-24(1997)
        摘要：Pentadiene was polymerized in CH2Cl2 at 20℃,initiated by AlCl3 and (CF3SO3) 3Al.The polymer chain contains both linear segments and cyclic structures.The cyclic fractions of PDD prepared by AlCl3 and by (CF3SO3)3Al are respectively 25% and 48%.The cyclization reaction takes place through two processes:(Ⅰ)Intramolecular chain transter;(Ⅱ)protonic initiation.The process(Ⅱ)could be essentially hindered in the presence of DtBP.The cyclization of PPD induced by AlCl 3 occurs mostly through the process(Ⅰ) and the cyclization in the polymerization initiated by (CF3SO3)3 Al is induced mainly by the process(Ⅱ).In the process(Ⅱ)the cyclization takes place on the double bonds of the lateral groups of 1,2 units.  
          
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        发布时间：2021-03-19
      • SHAN Guorong,PAN Zhicun,WANG Xiaogong,LIU Deshan,ZHOU Qixiang
        Issue 1, Pages: 25-30(1997)
        摘要：The sequence distribution of the co-units in para-coupled and wholly aromatic coolyamides can be determined in the combination of theory with experiment.Amodel was put forward to explain the effects of the sequence ditribution on the liquid crystalline behavior of copolyamide in concentrated sulphuric acid.The relationship of the sequence distribution and the liquid crystalline behavior was discussed.  
          
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        发布时间：2021-03-19
      • OU Yuchun,FANG Xiaoping,FENG Yupeng
        Issue 1, Pages: 31-37(1997)
        摘要：Based on interfacial layer properties of rigid particle toughening polymer system,microstructure,crystallization,processing flow behavior and mechanical properties of polypropylene(PP)hybrid composites,which were mixed with Kaolin coated by modifier with flexible molecular chain as a toughening agent and short glass fiber(GF) as a reinforcer,were studied by means of scanning electron microscopy(SEM),differential scanning calorameter(DSC),molten index test( MI ) and mechanical tests.The results shown that notched lzod impact strength(S1)of the PP composites is improved by hybrid modification,especially in the presence of 50%(wt%)Kaolin cintent,while tensile strength and flexible modulus of these composites are not decreased.  
          
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      • YANG Hongli,WU Xuqin
        Issue 1, Pages: 38-42(1997)
        摘要：A series of in situ composites were obtained by melt blending a thermoplastic resin polysulfone(PSF) and four kinds of whollyaromatic thermotropic liquid crystalline polymers which composed of terephthalic acid(TPA),m phthalic acid(MPA),p hydroxybenzoic acid (PHB) and a bisphenol monomer.There are four kinds of bisphenol monomers:4,4′ dihydroxy bisphenyl(BP),4,4′ dihydroxybisphenyl methane(BPM),bisphenol A (BPA),4,4′ dihydroxy bisphenylsulfone(BPS),corresponding liquid crystalline polymers (LCP) were represented by BP-LCP,BPM-LCP,BPA-LCP,BPS-LCP respectively.The morphology,thermal property and mechanical properties of these in-situ composites were studied.The results showed that BP-LCP and BPS-LCP could form fibrous structure in PSF resin,and skin-core effect appeared on their fracture surface.BPM-LCP and BPA-LCP only had spherical shape.The compatibility of these liquid crystalline polymers(LCPs)and PSF was poor.The mechanical properties of PSF were improved by adding these LCPs,especially by adding BP-LCP.  
          
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        发布时间：2021-03-19
      • TAN Susheng
        Issue 1, Pages: 43-48(1997)
        摘要：The binary interpenetrating polymer networks (IPNs) of polyacrylate and epoxy were synthesized simultaneously,and the polyacrylate network and the epoxy network were prepared by the preswollen method.The dynamic mechanical properties of the PEGDA/EPO IPNs with various composition ratios and the preswollen “pure” component networks were characterized by means of viscoelastic analyzer.From the rubber elastic theorical point of view,the relation between the modulus of the PEGDA/EPO IPNs and that of the PEGDA and EPO preswollen networks were discussed.It refered that the interpenetrating or mutual entanglements between the two component networks increased the effective"cross-link density",which contributed to the increased modulus of the IPNs.The measurements of the densities of the PEGDA/EPO IPNs implied the same facts also.  
          
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      • WU Shihua,ZHU Changying,HUANG Weiping,ZHAO Weijun,ZHANG Shuji
        Issue 1, Pages: 49-54(1997)
        摘要：The metal vapor method was used to prepare resin immobilized and active carbon supported Pd Cu bimetallic catalysts with three different Pd/Cu weight ratios.The transmission electron micrograph(TEM) and X ray diffraction(XRD) measurements showed that Pd Cu alloy was formed and the particle sizes of the alloy were very small,with average diameters<5 0nm.The metal particle sizes of resin immobilized catalysts were much smaller than that of active carbon supported catalysts.X-ray photoelectron spectroscopy indicated taht both Pd and Cu were in zero-valent state. The catalytic activities and selectivities of resin immobilized Pd-Cu catalysts in hydrogenation of 4-methy1-3-penten-2-one were much greater than that of the active carbon supported Pd-Cu catalysts.  
          
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      • ZHANG Ziyong,LIN Shangan
        Issue 1, Pages: 55-61(1997)
        摘要：Cobalt neutralized sulfo EPDM (Co (Ⅱ) S EPDM) ionomer has been synthesized by sulfonation and neutralization of EPDM. The oxygen permeability and O2/N2 permselectivity of Co (Ⅱ) S EPDM membrane were investigated. It was found that the membrane exhibited facilitated transport for molecular oxygen. This is suggested that a kind of polymer complexes was formed in the ionomer, which could bind molecular oxygen rapildy and reversibly through their other vacant coordination sites. The oxygen-binding evidence was given by ESR spectral change.  
          
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        发布时间：2021-03-19
      • HU Yunhua,\ ZHUO Renxi
        Issue 1, Pages: 62-67(1997)
        摘要：Polysiloxanes and copolysiloxanes bearing pendant long alkyl ether groups were synthesized by the hydrosilylation of PHMS with allylalkyl ethers. Their phase transition properties were studied. Drug release properties of the blended rubber films consisted of PDMS and polysiloxanes or copolysiloxanes obtained were also investigated. The melting temperature of polysiloxanes or copolysiloxanes increase as the lengthening of the pendant alkyl groups or the increasing of the content of longer alkyl groups. X-ray diffraction showed that the pendant alkyl groups possess lateral order arrangement.The effect of temperature on the permeation rate of the drug Levonorgestrel (LNG)through the blended films with different polysiloxanes or copolysiloxanes were studied.The permeation rate of the drugs increase as the increasing of temperature and are accelerated as the phase transition from crystalline to isotropic.  
          
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        发布时间：2021-03-19
      • ZHANG Lina,CHEN Jinghua
        Issue 1, Pages: 68-72(1997)
        摘要：Five water soluble heteropolysaccharides (GL1,GL2,GL3,GL4 and GL5) were isolated from phosphate buffer, hot water, alkali and hot alkali extracts of the fruiting body of Ganoderma lucidum. The results analysed by UV, IR,gas chromatography and uronic acid carbazole reaction showed that they were mainly composed of glucose, xylose, mannose and galactose, and GL3, GL4 and GL5 contained glucoronic acid. The intrinsic viscosities [η], weight average molecular weights M w , number average molecular weights Mn were determined by viscometry,light scattering and memberane osmometry.The values of Mnfor samples of GL2,GL3 and GL5 are 124×104,12.8×104 and 5.8×104 respectively. From analysis of the data, we deduced roughly a conclusion that these heteropolysaccharides contained water- soluble D-glucan,and GL2 extracted from phosphate buffer included a β-D-glucan with stiff chains.  
          
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        发布时间：2021-03-19
      • CHEN Yan,WANG Xinyu,GAO Zongming,ZHU Xiaoguang,QI Zongneng,CHOY C. L.
        Issue 1, Pages: 73-78(1997)
        摘要：In order to improve the thermal stability and mechanical behavior of polyimide, a series of polyimide/silica composite films with different silica content up to 45 wt% were successfully prepared by sol gel reaction of tetraethoxysiliane in the presence of polyamic acid, a precursor of polyimide. The films with silica content less than 10 wt% were yellow and transparent, whereas the films with silica content higher than 10 wt% were yellow and opaque. The structure and physical properties were studied by FT-IR,TGA,DMA,TEC,stress-strain analysis and SEM. The results indicated that these polyimide/silica composite materials were nanocomposite materials.The density,decomposition temperature and modulus increased with increasing silica content,and the linear thermal expansion coefficient of the silica in the composite films decreased,whereas tensile strength and elongation at break have maxium with the change of silicate content.  
          
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        发布时间：2021-03-19
      • HE Liu,\ JIANG Xueping,\ ZHANG Shufan,\ QI Zongneng,\ WANG Fosong
        Issue 1, Pages: 79-85(1997)
        摘要：The molar mass effect on phase transition of a chiral side chain liquid crystal poly 4 acryloxyloxy undecanoloxy 4′ [ s( ) 2 methylbutyloxyloxy] biphenyl (PA 11) was studied in the present work. The experimental results show that the mesomorphic temperature range depended on the degree of polymerization ( DP ) of polymer. The PA 11 with DP below 7 exhibits an enantiotropic S A mesophase, while polymer with DP over 7 displays both S A and S * C enantiotropic mesophases.Moreover,molar mass distribution has an effect on liquid crystalline behaviour of polymer.  
          
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        发布时间：2021-03-19
      • WANG Zhiliu,Liang Gaodao,WANG Zhentian
        Issue 1, Pages: 85-91(1997)
        摘要：Effect of solute adsorption on vapor pressure osmometry measurment was studied by four low molecular weight organic compounds and five narrow MWD oliomeric polystyrene samples with known average molecular weight in Knauer VPO apparatus. Correction factor for solute adsorption was proposed, which leads to that the instrumental constant K does not depend upon the molecular weight of the solute. The accuracy of measuring number average molecular weight of low molecular weight polymer was improved.  
          
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        发布时间：2021-03-19
      • DONG Lishuang,QIU Kunyuan,LU Wenkui,CHEN Dequan
        Issue 1, Pages: 91-96(1997)
        摘要：A new kind polyfunctional initiator 4,4’ azobis (4 cyanopentanoyl p methyl anilide)(ACPMA) has been synthesized from 4,4' azobis (4 cyano pentanoic acid) via two steps reactions. The thermal decomposition rate of ACPMA in DMF was determined by nitrogen evolution technique at 65,70,75,80℃, respectively. It was found that the decomposition reaction follow first order kinetic and the activation energy was calculated to be 124 6 KJ/mol -1. The prepolymer containing azo end group can be obtained from the polymerization of monomer,such as acrylonitrile(AN),acrylamide(AAM) using Ce (IV)ion and ACPMA as a redox initiator.The p-methylphenylaminocarbamoyl group would react with Ce(IV)ion to form a nitrogen center radical to initiate monomer polymerization and the azo group is reserved.When the prepolymer obtained was mixed with methyl methacrylate (MMA) in DMF reacted at 65℃,the decomposition of azo group took place and resulting macromolecular carbon center radical would initiate MMA to block copolymerization.The purified block copolymers were characterized by IR analysis.  
          
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        发布时间：2021-03-19

        Research Bulletin

      • ZHAO Bingxi,CHEN Wenming,CHEN Daoyong,YAN Lifeng,ZHU Qingren,HAN Zhewen
        Issue 1, Pages: 97-101(1997)
        摘要：Five methods were used to measure the reactivity ratios of copolymerization of Tributyltin Methacrylate with MMA.The mean error was gotten from the duplicate exper iments and the 95% credible regions of the reactivity ratios were drawn by the RREVM computer software.Through comparation of credible regions,the evaluation of the accuracy of methods is given.Copolymers PTBTM co MMA were prepared by radiation copolymerization which is radical reaction.The result shows that the method of element analysis and UV or AAS all of these can use to measure the reactive ratios of this copolymer precisely.We made a comparison by the RREVM computer software and discovered the method of UV and element analysis is the best method,but AAS is better than other methods.So we found some better methods than the reference says.  
          
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      • ZHANG Junyan,PAN Guangming
        Issue 1, Pages: 102-113(1997)
        摘要：A new class of aliphatic polyimide based on dianhydrides from dicyclic 1,2,3,4 cyclopentanetetracarboxylic dianhydride (CPDA) were prepared.Their glass transition temperature ( T g ),gas permeability and solubility were measured,and the relationship between permeability and chain flexibility were discussed.The data of the permeability coefficients of five different polyimide membrones based on CPDA are related to the value of its free volume.The order of the permselectivity coefficients of polyimides is contrary to the order of the volume of its glass transition temperature.  
          
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      • ZHOU Tao,CHEN Shuangji,LI Zichen,ZHOU Xihuang,LI Fumian
        Issue 1, Pages: 106-105(1997)
        摘要：The photo oxidation of cis 1,4 polybutadiene in the presence of C60 was studied by pursuing the IR spectra changes with irradiation time and determination of the peroxide with spectrometric method.It was found that C60 acted as a effective photosensitizer to convert the molecular oxygen into singlet oxygen and thus the ene reaction of singlet oxygen with carbon carbon double bonds in the polymer chain took place.The content of peroxide formed increased with the increase of the irradiation time and the concentration of C60,but seemed to have little relation with the concentration of cis-1,4-polybutadiene under current experimental conditions.Isomerization of double bonds with little carbony group formation were also observed during the photo-oxidation.  
          
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      • LI Wenjun,WANG Hanfu,LU Yuhua,WANG Zhiliang,ZHONG Wei
        Issue 1, Pages: 111-110(1997)
        摘要：A novel semi interpenetrating polymer network (semi IPN) membrane composed of crosslinked chitosan (cr CS) and polyacrylic acid (PAA) was prepared.The IR spectra confirmed that CS and PAA can form polyelectrolyte complex (PEC) through electrostatic interaction between NH + 3 group from CS and COO - group from PAA.The semi IPN membrane exhibited a typical pH sensitivity,and its degree of swelling in different salt solutions with equal metal ionic valence and ionic strength were on the same level.Under certain ionic strength(I=1.5mol/L),the degree of swelling increased with increasing metal ionic valence.Furthermore,the elongation of the semi-IPN membrane could vary reversibly by addition of CaCl2 solution and KCL solution altermately.  
          
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      • WANG Chenhui,WANG Anfeng,CHE Bo,ZHOU Caihua,SU Linli,LIN Sichong,WANG Bin
        Issue 1, Pages: 114-118(1997)
        摘要：Poly(ethyleneglycol monoethylether) methacrylate was grafted onto the segmented poly(ether urethane) (SPEU) by ozonization.The water absorption,grafting measurement and the scanning election microscopy photographs indicated that graft copolymerization has effectively made the SPEU surface covered with the water soluble chains.The hydrophilicity and water absorption of film had been improved greatly.Autoacceleration effect in ozone induced polymerization had also been discussed.  
          
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      • YANG Zhenzhong,XU Yuanze,YU Hao,ZHAO Delu
        Issue 1, Pages: 119-120(1997)
        摘要：A new porous microsphere of Bisphenol A Epoxy Resin was obtained by drying in vacuum the waterborne system of Epoxy Resin previously prepared in our laboratory,and the morphology of the microspheres was observed by SEM.The preliminary results showed that the microsphere size is in the range of 5～20μm and the hole size is about 1μm,besides,the SEM result of the cracked microsphere could seemly give the more detailed information about the inner structure of the microspheres.  
          
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      • QIN Wei,ZHU Daoben
        Issue 1, Pages: 121-124(1997)
        摘要：The monomer of bis(ethylenedithio) tetrathiafulvalene (BEDT TTF) with ethynyl has been synthesized and polymerized to form a polymer.The polymer doped with iodine using two different methods is semiconductors at room temperature.The conductivities are σ =1.95×10-5S/cm-1 and σ =7.3×10-9S/cm-1 respectively.  
          
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      • CHEN Liwei,ZHENG Lei,HONG Han,LI Zichen,ZHOU Xihuang,LI Fumian
        Issue 1, Pages: 125-128(1997)
        摘要：C60 can react easily with 2 aminoethanol forms a water soluble derivative (C60 AE).C60 AE can be further modified by acrylyl chloride and methacrylyl chloride form fullerence containing monomers (C60 AE AC and C60 AE MAC).A macromolecularized water soluble fullerenc (C60 JD400) has been also obtained by reaction of C60 with amino group terminated poly(propylene glycol) (Jeffamine D400). Based on above water soluble C60 s,three kinds of C60 -involved hydrogels are prepared,i.e.adsorbing of C60-JD400 by poly(N-isopropylacrylamide)hydrogel results hydrogel involving C60,absorbing type;polymerization of N-isopropylacrylamide in C60-JD400 aqueous solution gives an semi-IPN type and its copolymerization with C60-AE-AC or C60-AE-MAC leads covalently binding type. The superoxide anion (O-2)level under wisible light irradiation in systems containing C60-JD400 has been investigated by traditional cytochrome C method.Cytochrone C is reduced by superoxide anmion and the absorbance of reduced cytochrome C increases along with the increasing of irradiation time.  
          
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