最新刊期
      卷 ， 期 2 ， 1996

        Research Article

      • CHEN Lei,YU Xuehai,YANG Changzheng
        Issue 2, Pages: 129-135(1996)
        摘要：series of polyurea block copolymers based on either aminopropyl terminated cyano-containing polysiloxane or polydimethylsiloxane soft segments was synthesized. The hard segments consisted of 4,4'-methylenediphenylene diisocyanate chain extended with ethylenediaAnne.The hydrogen bond and the morphology of these block copolymers were studied by FT-IR,NMR and DMA. These materials exhibited microphase separation of the hard and soft segments, and the microdomains may change greatly in different systems due to the difference of the hydrogen-bond in these block copolymers. The hydrogen-bond in the cyano-containing polusiloxane-polyurea block copolymers was not only in the hard segment domains but also in the interphase between the solt and hard segments;attaching polar cyano side groups along the prlysiloxane chains promoted phase mixing in comparison with polydimethylsiloxane-based polyurethanes.The hydrogen-bond between the soft and the hard segments increased with the increase of the thickness of the interphase.The observation also showed that the hydrogen-bond in the block copolymers was affected by the concentration and the temperature of the solution.  
          
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        发布时间：2021-03-19
      • LIU Jin,XIE Hongquan,GUO Junshi
        Issue 2, Pages: 136-141(1996)
        摘要：The amphiphilic copolymers with polyoxyethylene (PEO) grafts were synthesized by copolymerization of the methacrylate terminated PEO macromers with styrene(S), methyl methacrylate(MMA) or methyl acrylate(MA) respectively, and charac terned by GPC,IR, 1H-NMR,WAXD and DSC. Their crystalline properties, emulsifying properties and phase transfer catalytic effects in the Williamson reaction were studied. The crystallinity of the copolymers increases with the increase of both the content and molecular weight of PEO grafts. In the Williamson reaction both the emulsifying volume and conversion increase with the amount or PEO content of the copolymers used,but decrease with increasing molecular weight of the PEO grafts.  
          
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      • LI Zifa,GUO Yinzhong,ZHANG Chunxiao,HE Xueqing,ZHOU Qifeng
        Issue 2, Pages: 142-147(1996)
        摘要：series of liquid crystalline and non-liquid-crystalline sequential copolymers was synthesized by radical polymerization of styrene and the mesogenic monomer. The liquid crystalline behavior of the copolymers was studied by DSC, polarized optical thecroscopy and X- ray diffraction. It was found that the mesogenic monomen and all copolymers except the CP -9, showed good thermotropic liquid crystallinity and broad temperature ranges between T8 and Ti, The molecular weights, transition temperatures and decomposition temperatures of the copolymers changed regularly with the increase of the contents(mol%)of styrene in the copolymers.  
          
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      • WANG Liqun,ZHU Kangjie,YANG Shilin
        Issue 2, Pages: 148-152(1996)
        摘要：opolymers of styrene and acrylamide with different acrylamide content (PSAm) and poly (2-hydroxyethylene methacrylate) (PHEMA) were synthesized by free radical polymerization. The miscibility of PSAm/PHEMA blends was studied with the use of DSC, IR methods. A miscibility window was observed when the amount of acrylamide in the copolymers was between 47 and 57mol%. A mean field theory was employed to analyze the blend system. The result showed that the repulsion of dissimilar segments in the copolymer chain led to the miscibility window of the blends.  
          
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      • DONG Dewen,NI Yushan,CHI Zhenguo
        Issue 2, Pages: 153-158(1996)
        摘要：series of wholly aromatic thermotropic liquid crystalline copolyesters was synthesized from his (4-hydroxyphenyl) methanone, terephthalic acid,p-hydroxybenzoic acid and resorcinol via melt polycondensation and solid state polyinerization process. Under polarizing microscope with hote stage, the transition process, birefringent phenomenon and textures of samples were observed. From DSC trace, the relationship of Tg and Tm vs. monomer component were studid. WAXDmeasurements revealed that reflections at 20 = 20°and 24°were observable.All results showed that the copolyesters possessed properties of nematic random copolyesters.  
          
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      • LUO YingWu,WENG Zhixue,HUANG Zhiming,PAN Zuren
        Issue 2, Pages: 159-165(1996)
        摘要：A new model of branch point distribution of copolymer regarding molecular weight was postulated from the speciality of monovinyl-divinyl radical copolymerization. The effects of the model of branch point distribution and the index c in the relation [η]0,b /[η]0,1=g0c on the structure characterization of polymer with long-chain branches was discussed with the GPC-intrinsic viscosity method. A model of average branch density of copolymer before gel point was derived from vinyl chloride-divinyl suspension polymerization.The results of experiment were fitted with the models of average branch density and molecular weight before gel point,and it was found that the models fitted very well with the results of experiment with the new model of branch point distribution and C=0.72.It was concluded that the pendent double bond reactivity reduced by an order,and the crosslinking reaction was controlled by disffusion.At last,the correlation of intrinsic viscosity with viscosity average molecular weight was formulated well with [η]=0.2357M0.527v.  
          
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        发布时间：2021-03-19
      • LI Andong,SONG Xiangyu,ZHOU Enle
        Issue 2, Pages: 166-171(1996)
        摘要：Mixtures of Poly (MMA-co-BMA) with different composition have been prepared by solution casting. The miscibility and the phase transition have been examined over the whole range of concentration by differential scanning calorimetry (DSC), optical microscope and torsional braid analysis (TBA). The mixture was found miscible below 10% (by weight) Cholesteryl nonanoate content. Within wider range of concentration, Cholesteryl nonanoate in mixture can still form liquid crystalline phase or crystalline phase on certain conditions.The liquid crystalline phase can also been frozen in below Tg of the copolymer.Melting enthaply △HK,I of Cholesteryl nonanoate in mixtures was limited by the molecular mobility of the copolymers.  
          
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      • SONG Wenhui,CHEN Shouxi,JIN Yongze,QIAN Renyuan,ZHOU Qifeng
        Issue 2, Pages: 172-177(1996)
        摘要：new method, the technique of band texture decoration has been used to study the disclination of thermotropic aromatic copolyester with T-shaped mesogens.The molecular chain or director orientation patterns of the nematic mesophase is decorated by band texture formed during quenching without being sheared because the molecular director orientation lies perpendicular to the long axis of band. All six of disclinations of S= ±1 /2 and S= ±1 decorated by this band texture have been observed directly under a polarizing optical microscope.Besides, a disclination of high strength S=-3/2 and closed inversion walls have been observed in this kind of LCPs.  
          
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      • YE Chunmin,TANG Gongben,LIU Jingjiang
        Issue 2, Pages: 178-182(1996)
        摘要：The samples of a little Nd2O3 (neodymia) filled polypropylene (PP) are prepared. The isothermal crystallization dynamics have been investigated by DSC. The results show that Nd2O3 can enhance the growth rate of spherulite in PP, reduce the surface free energies of the developing crystals, and improve the behavior of isothermal crystallization of PP dealt with the Avrami and Hoffman’s theories.  
          
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        发布时间：2021-03-19
      • HU Binghuan,LIN Jinhuo,CHEN Wending
        Issue 2, Pages: 183-188(1996)
        摘要：Light-coloured cashew nut lacquer has been prepared by the reaction of cardanol, maleic anhydride and urotropine. The chemical reactions involved in the synthesis has been discussed by means of the IR analytical results. The molecular weight of the reaction product determined by GPC is 2.8×103. The physico-mechanical properties of the casting film are excellent, and extremely resistant to strong acids, water and high temperature, which are comparable to those of natural lacquer.  
          
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      • LU Xueran,ZHANG Lifeng,DUAN Heping,CHEN Yuanyin
        Issue 2, Pages: 189-194(1996)
        摘要：Two new benzocrown ethers, 9 -undecenyloxymethyl - 2, 3-benzo- 15 crown- 5 and 18-crown - 6, were synthesized from 1,2 -bis (hydroxyethoxy) benzene bistosylate and corresponding undecenyloxymethylpolyethylene glycol via cyclcondensation in 22 and 20% yield, respectively. The crown ethers were subjected to hydrosilylation by triethoxysilane, followed by immbilization on fumed silica, and then reacting with potassium platinite in acetone under nitrogen atmosphere,sequentially. It was found that the platinum complexes exhibited very high catalytic activity for the hydrosilylation of olefins with triethoxysilane.The hydrosilylation of decene took place even the amount of silica-bound benzo-15-crown-5 platinum complex used was as low as 1×10-5mmol of Pt.In such a case,the decene used was 5.0mmol,the yield of decyltriehoxysilane was about 77% and the turnover number was as high as 380,000.  
          
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      • ZHU Xiaoguang,DENG Xiaohua,HONG Xuan,QI Zongneng,CHOY C.L.
        Issue 2, Pages: 195-201(1996)
        摘要：Toughened PP /CaCO3 composites were obtained by designed interface of composite[1]. Resistance curve method has been used to detendne the Jc values of polypropylene (PP) and the toughened polypropylene /CaCO3 composites. The addition o f CaCO3 gives rise to substantial increases in both the Young’s modulus (E) and notched Izod impact strength (SI), a slight increases in Jc and a sharp rise in the crack propagation resistance dJ/ d(△a). The results show that the incorporation of filler leads to both stiffening and toughening effects for pp,the elastic component JE of the J is larger than the plastic component Jp(=hysteresis component Jh).As the filler content increases,Jc changes slightly but Jh rises sharply,indicating large dissipation of energy.Scanning electron microscope(SEM) observation reveals that the microscopic damage process responsible for energy dissipation are cavitation and plastic deformation.It is proposed that the criterion for toughening in a particulate-filled polymer is that the composite has a higher Jh value than the polymer.  
          
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      • WANG Yi,XIE Zemin,WANG QingZheng,CHEN Zonghan
        Issue 2, Pages: 202-209(1996)
        摘要：The kinetics of thermal degradation for polydimethylsiloxane(Si-O- 1),polydimethylsiloxane containing residual basic catalyst(Si-O-2), silicone gums containing cyclodisilaZane (St-N-1), Si-O-3 by incorporation of Si-N-1 into Si-O-1 and Si-O-4 by incorporation of Si-N-1 into St-O-2 were studied by the isothermal gravimetric analyses (IGA) in nitrogen atmosphere. The results indicated that Si-N-1 has outstanding thermal stability. The activation energy of degradation is 344kJ /mol. Si-O-1 undergoes the thermal degradation with the activation energy of 152kJ/mol,while the activation energy of degradation energy for Si-O-3 is 230 kJ/mol in presence of Si-N-1.The activation energy of degradation for Si-O-4 is 144 kJ/mol, while Si-O-2 has only 62 kJ/mol in absence of Si-N-1.The enhancement of thermal stability for Si-O-4 is attributed to decreasing the loose ability of the catalyst ion pair when Si-N-1 removes the SiOH groups and water in the Si-O-4.  
          
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        发布时间：2021-03-19
      • SHI Yanqiao,CHEN Guanwen
        Issue 2, Pages: 210-215(1996)
        摘要：Composite membranes with a poly (vinylalcohol) (PVA) layer coated on polyacrylonitrile(PAN) support membranes were evaluated for pervaporation separation of water-alcohol mixtures. The PVA /PAN composite membranes as prepared were water permselective for the ethanol concentration range of 60 to 99wt% in the feed, and the separation factors were 800 ￣ 1100, permeate flux was 300 ￣ 450g/m2hat 75℃ (for ethanol concentration in feed 95wt%). The dependence of the permeate flux on temperature was consistent with the Arrhenius relationship,and the separetion factor and permeate flux was increased with increasing operation temoerature. PVA/PAN composite membrane has excellent permselectivity for separating mixutures of iso-propanol(or iso-butyl alcohol,glycerin)and water.  
          
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      • SUN Weilin,SHEN Zhiquan,ZHANG Yifeng
        Issue 2, Pages: 216-221(1996)
        摘要：Chelating resins (CZAT, CEZAT) bearing 2-aminothiazol groups have been first synthesized by the reaction of polychloromethylthiirane (PCMT) or copolymer containing chloromethylthiirane and epichlorohydrin (PCMT-ECH) with 2-aminothiazol by using diethylenetriamine as the crosslinking agent. These resins chelate strongly with Ag(I ), An(Ⅲ) and Hg(Ⅱ), moderately with Pt (Ⅳ) and Pd(Ⅱ), as well as wealdy with Cu(Ⅱ), Cd(Ⅱ), Zn(Ⅱ), Pb(Ⅱ), Cr(Ⅲ), Co(Ⅱ),Bi(Ⅲ). C2AT has excellent absorption selectivity for An(Ⅲ) and Ag(I).The Ag(I) or Au (Ⅱ) adsprbed on C2AT resins can be easily and quantutatuvely eluted by 15% aqueous ammonia solution or 2% aqueous thiourea solution respectively.The adsorption mechanism of Pt (Ⅳ) adsorbed on C2AT resin was studied by XPS.  
          
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      • LIAO Bing,HUANG Yuhui,CHEN Mingcai,CONG Guangmin,SHEN Deyan
        Issue 2, Pages: 222-227(1996)
        摘要：A difference-spectrum method of FTIR was used to study the variation of characteristic infrared spectral absorption band in carboxylated PPO and polystyrene blends. It was found that vibration frequency shifts of the characteristic infrared absorption bands in CPPO /PS blends, with 8.0% carboxylated contents in CPPO and 50 / 50 ratio of CPPO /PS, varied regularly with raising temperature. It was found that three slopes corresponding to the three temperature ranges: below 190℃, 190～220℃ and above 220℃, appeared in frequency-temperature curves for the CPPO/PS blend. These temperature ranges are consistent with the UCST area, the miscible area and the LCST area abtained by our previous works.The variation of interaction between CPPO and PS molecules with raising temperature was studied.The mechanism of phase transformation was discussed.  
          
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      • ZHAO Zhudi,GAO Zongming,OU Yuchun,QI Zongneng,WANG Fosong
        Issue 2, Pages: 228-233(1996)
        摘要：γ-glycidoxypropyltrimethoxysilae (KH560), styrene (St) and maleic anhydride (MAH) composite has been prepared by Sol-Gel method. The structure and properties of the composite was characterized by FTIR spectroscopy, dymanic mechanical analysis, atominc force microscope, SAXS and thermal gravimetric analysis.The results showed that the composite has network structure between polysiloxane and styrene-maleic anhydride copolymer and the polysiloxane forms nanometer microphase structure dispersed in the styrene-maleic anhydride copolymer and the polysiloxane forms nanometer microphase structure dispersed in the styrene-maleic anhydride copolymer matrix.  
          
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      • LIU MingZhu,CHENG Rongshi,QIAN Renyuan
        Issue 2, Pages: 234-239(1996)
        摘要：On the basis of previous investigation of concentration dependence of cryogenic gelation for aqueous solution of poly (vinyl alcohol) (PVA), the physical hydrogels with high water content were prepared by freezing and thawing to the PVA aqueous solution. The properties of the hydrogels in distilled water have been investigated. A swelling kinetic equation was proposed:Qt= Qe-(Qe- Qo) /eldThis equation fits the experimental results. A quantitative relationship between equilibrium swelling ratio and the solution concentration was also obtained:Qe=60.3-4.45×102C.It was found that equilibrium swelling ratio Qe,dissolution amount W of the hydrogels and the times N of freezing-thawing cycles followed the power lawa:QeN-a; W N-β,as N≤5.By comparing the results of this work with that of previous paper,we found that Qe,reflected the intermolecular hydrogen bonding cohesional entanglemet of concentrated soloution of PVA and [η],described the intramolecular hydrogen bonding cohesional entanglement in dilute solution of PVA are equal in value.  
          
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        Research Bulletin

      • ZHU Chengshen,WANG JingWu,LI Zhuomei
        Issue 2, Pages: 240-243(1996)
        摘要：Based on Borokhovskii equation, the nonisothermal crystallization kinetics and mechanism of nylon 1010 have been studied by DSC at cooling rate 10 to 320 K /min. There is a turning point at each plot of nonisothermal crystallization kinetics.In the earlier part of the plot, then values are near 4, that is homogenous nucleation and growth in three dimensions, and crystallization rate constants are not considerably varying with raising of cooling rate (a). The kinetic crystallialbility per unit cooling rate is nearly wqual,whose average value Gcis 0.617.  
          
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      • WEI Yuchun,YUAN Huigen,PAN Zuren
        Issue 2, Pages: 244-247(1996)
        摘要：The state of aggregation of the ionic bonds in IPN was investigated by Far-Infrared spectra and X-ray scattering. A far-infrared band, due to the vibration of a higher-order cluster, was found at 145cm-1 for IPN neutralized completely by Zn2+ salt. This band, which was observed in addition to the known cation-motion bands, was assinged to the vibrations of aggregates involving many cations and anionic sites close together. X-ray results revealed a low-angle x-ray peak corresponding to the clusters. The modified Bragg spacing was 2.39nm.It was interpreted as a result of short range ordering of multiplets around ionic clusters.  
          
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      • WU Dacheng,XIE Xinguang,LI Ruixia,WANG Yong,ZHOU Zinan,GAO Xinfeng,XIAO Yanwen,ZHANG Jianguo
        Issue 2, Pages: 248-253(1996)
        摘要：The wholly aromatic copolyester, copely(p -hydroxybenzoate /bisphenol A terephthalate). was characterized by high resolution nuclear magnetic resonance(NMR) spectroscopy (including twodimensional techique, 2D NMR). It was found that the 13C-NMR spectra of carbonyl group in the copolyester chain were not so simple as in the monomeric aromatic ester and they gave the useful information of the chain sequences. There are good relationships between the carboxyl group resonance peaks and the triad of the monomer residues.  
          
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      • YAO Hui,XIAO Shijing,LU Honglan
        Issue 2, Pages: 253-256(1996)
        摘要：Copolymerization of ethylene /propylene and ethylene /1-butene with two Zirconocene/ methylaluminoxane (MAO) catalyst systems were invesitgated. The influences of Et bridge between two Indenyl groups on the catalyst performances and the properties of copolymer obtained had been discussed.It was found that the activity of bridged Et(Ind)2ZrCl2 catalyst was higher than that of nonbridged (Ind)2ZrCl2 catalyst. The copolymers (E /P and E /1-B) produced with Et(Ind)2ZrCl2 had higher comonomer content, lower molecular weight/density and melting point compared with those produced with (Ind)2ZrCl2.  
          
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