最新刊期
      卷 ， 期 4 ， 2005

        Rapid Communications

      • YOU Jinxiu,CUI Qi,ZHANG Min,LIU Baohua,CHEN Liban,ZHANG Songwei
        Issue 4, Pages: 481-483(2005)
        摘要：A novel α-diimine Zn catalyst for copolymerization of carbon dioxide and eyelohexene oxide was synthesized with 2,6-diisopropylaniline,glyoxal,diethylzinc and isopropanol．The precursor N,N’-bi(2,6-diis-opmpylphenyl) ethyldiimine (BDIE) was characterized by 1H-NMR and proved to be an α-diimine．The copolymerization of carbon dioxide and cyclohexene oxide was investigated by changing feeding processes with two catalysts including α-diimine and β-diimine zinc compounds．Catalytic efficiency for the eopolymerization was enhanced up to 1.17×105g polymedmol cat by appilcation of batch polymerizations in which monomers were fed in batch.  
          
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        发布时间：2021-03-19
      • LIU Quanwei,LI Yi,WANG Zhiliu,XIE Hongfeng,YANG Hu,CHENG Rongshi
        Issue 4, Pages: 484-485(2005)
        摘要：In order to investigate the property and concentration dependence of dissociation and hydrolysis of polyelectmlytes,acrylic acid-sodium acrylate eopolymers with various degree of neutralization were prepared by adding calculated amounts of sodium hydroxide into the aqueous solutions of a poly (acrylic acid) sample,and the pH values of the solutions covering a wide concentration range were measured for each copolymer at 25℃．It was found that the pH values of the sofutions of a copolymer with degree of neutralization of 0.96 kept constant and equaled to 9.80 as c>0.001 mol/L．For another copolymer with degree of neutralizatlon of 0.30．the pH values of its solutions remained constant and equaled to 6.25 as c<0.001 mol／L．These two copolymers may serve as polymeric buffer reagents which couldn’t penetrate thmugh semi-permeable membranes in the corresponding concentration regions．  
          
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        发布时间：2021-03-19

        Research Article

      • JIN Fan,WU Chi
        Issue 4, Pages: 486-490(2005)
        摘要：By using a special double-layer membrane to avoid interaction among flowing fields in different pores．the theoretically predicted discontinues transition in ultra-filtration of flexible linear polymer chains was observed for the first time．Namely,the chains could pass thmugh pores with sizes much smaller than the chain’s unperturbed radius when the flow rate is higher than a threshold．In theory,such a threshold is independent of both the chain length and the pore size．However．we found that when the macroscopic flow rate Was lower than the threshold．some of the pores were blocked by a fraction of longer polymer chains．Therefore,the microscopic flow rate in the non-blocked pores became higher than the threshold so that the rest of the chains could pass throllgh these non-blocked pores．This leads to an apparent separation of the chains with different lengths.  
          
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        发布时间：2021-03-19
      • HOU Zhaosheng,TAN Yebang,HUANG Yuling,ZHANG Yi,ZHOU Qifeng
        Issue 4, Pages: 491-495(2005)
        摘要：A kind of pseudopolyrotaxanes was prepared by supramolecular self-assembly of poly (4-vinyl-N-n-butylpyfidinium bromide) (P4VBuBr2) with cucurbituril[6] (CB[6]) in water at room temperature．The chemical structure of pseudopolyrotaxanes was confirmed by 1H-NMR,IR spectras and elemental analysis：CB[6] beads are localized aliphatic chain in side-chain of 2,and combine N+ by non-covalent bonds．Molar ratio of CB[6] to the repeat unit of 2 is 0.28：1,0.2：1 and 0.1：1．The properties of these pseudopolyrotaxanes were studied by thermogravimetry analysis(TGA),UV-Vis,X-ray powder diffraction (XRD) measurements and adding NaBr to the solution of the pesedupolyrotaxanes．The results show that pseudopolyrotaxanes have hisher thermal stability,stronger absorption band and higher crystallizability than the parent polymers．The thermal decomposition temperature of posudopelyrotaxanes increases with increasing the amount of CB[6] threaded on the polymer．NaBr is a good precipitating agent for the pesudopolyrotaxanes．  
          
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        发布时间：2021-03-19
      • QIU Weili,YANG Qinghe,MA Xiaohua,FU Yanbao,ZONG Xiangfu
        Issue 4, Pages: 496-500(2005)
        摘要：An inorganic-organic hybrid polymer electrolyte based on organically modified polysiloxane was prepared bv UV radiation curing in the presence of liquid electrolyte．The organically modified polysiloxane with acrylate groups at the terminal positions was synthesized by hydrolytic condcnsadon of tetramethoxysilane and followed by ester exchange reaction using 2-hydroxyethyl acrylate．This monomer was polyfunctional with the rational formula of SiO1.143(OH)0.016(OCH3)1.339(OCH2CH2OCOCH=CH2)0.357 obtained from 1H-NMR analysis,FT-IR analysis and silica analysis．The electrochemical properties of the inorganic-organic hybrid polymer electrolyte were determined by ac impedance and cyclic voltammetry．Ionic conductivity was greatly enhanced with increasing amounts of liquid electrolyte．When the polymer electrolyte contained 85 wt％ liquid electrolytes,the conductivity was around 5.5 x 10-3 Scm-1 at 22℃ and 1.1×10-3 S cm-1 even at -23℃．Interface resistance increased initially and reached a steady value after 2 days．Oxidation stability was up to 5.0 V against the hthium reference electrode,and electrochemical plating/stripping of lithium on the stainless steel electrode was reversible．  
          
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        发布时间：2021-03-19
      • WANG Haiqiao,LIU Yu,SONG Na,HE Chang,LI Yongfang,LI Xiaoyu
        Issue 4, Pages: 501-506(2005)
        摘要：Three light-emitting ahemating copolymers,DSB-TEO,DSB-SEO and DSB-PEG1500.consisting of 1,4-distyrylbenzene (DSB,oligomer of poly(p-phenylene vinylene)(PPV) with three units) and ionic conducting oligomer ethylene oxide (OEO) segments in different lengths,were synthesized．The charge transport mechanism of these copolymers in chloroform solution was studied．The relationship of OEO chain length with crystallization,phase structure and solvency to the Li salt of eopolymers were investigated．A proposal was offered for a rational design of this kind of eopolymers．A light-emitting diode with configuration ITO/PEDOT-PSS/DSB-TEO/Ca(Al) was successfully fabricated．  
          
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        发布时间：2021-03-19
      • DU Naiying,MEI Qunbo,LU Mangeng
        Issue 4, Pages: 507-512(2005)
        摘要：8-Hydroxyquinoline lithium (Liq)-containing copelymers were synthesized by free radical copolymerization of methyl methacrylate (MMA) and a Liq-pendant monomer prepared by LiOH and 5-(2- methacryloylethyloxymethyl)-8-quinalinol．The structure of the monomer,Li(C9H5NO)CH2OCH2OOCC(CH3)- CH2·H2O,was charactefized and confirmed by 1H-NMR,TGA and elemental analysis．Compared to PMMA,the copolymer was more thermally stable．The copelymers with Liq-content<15 wt％ can he dissolved well in common solvents．Ultraviolet-visible absorption．PL spectra proved that the luminescent centers mostly came from the Liq units．The monomer and the copelymer were blue-emitting matefials．It was found that the solvents．such as DMF．DMSO,which affected the conjugated electrons in quinolinolate groups can he used to modify the color of the lumineseence of the copolymer cast films．  
          
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        发布时间：2021-03-19
      • SHAO Huaiqi,ZHONG Shunhe
        Issue 4, Pages: 513-518(2005)
        摘要：The polyimide-silica-silver hybrid membranes supported on SiO2／K-M were prepared by sol-gel route and characterized by means of IR,TGA,SEM,XRD,N2 adsor ption and gas permeability measurements．The results show that the viscosity of hybrid sols and the pore size of bybrid membranes are increased and the pore size distribution is disporsed bv the addition of silver nitrate．Silica and silver existed as amorphism and silver chloride in hybrid membranes,respectively．Silver is bonded with nitrogen in polyimide and propylene is adsorbed on silver by double bond．The thermal decomposing temperature of hybrid membranes is increased by addition of silica and reduced with increaseof silver amount．The separationfactorsof propylene/pmpanethroughthe hybrid membrane are 3.54～4.1.The obvious facilitated transport of pmpylene is realized by the addition of silver．  
          
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        发布时间：2021-03-19
      • LIU Xueyong,CHANG Kun,WANG Xiaochuan,DING Xiaobin,PENG Yuxing
        Issue 4, Pages: 519-523(2005)
        摘要：Poly(ethylene oxide) macromonomer (MPEO) was synthesized by the reaction of acryloyl chloride and biamino poly (ethylene oxide) (NH2-PEO-NH2) prepared from PEG by Gabriel reduction. Amphiphilic polymer magnetic microspheres containing amino groups were prepared by dispersion copolymerization of styrene and MPEO in the presence of Fe3O4 magnetic fluid in ethanol/water medium．The content of the amino groups localized in the microspheres ranged from 0.01 to 0.25 mmol/g．The amphiphilie magnetic miemspheres ranging in diameter from 5 to 80μm could be prepared by changing dispersion polymerization conditions．The mechanism of magnetic miemspheres nucleation and growth was discussed．  
          
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        发布时间：2021-03-19
      • WANG Yijuan,JIANG Hongliang,HU Yingqian,ZHU Kangjie
        Issue 4, Pages: 524-528(2005)
        摘要：A series of biodegradable heparin/ampholytic chitosan (HP/ACS) complexes were developed for pH- sensitive release of protein drugs．ACS was synthesized by using acrylic acid (AA) and chitosan,and the substitution degree (SD) of AA can be modulated by the AA/chitosan feed ratio．The complexation between heparin and ACS was studied by colloid and turbidity titration．It was found that HP and ACS can form complexes within a certain pH range and the critical pH value for complexation (pHФ) is related to the SD of AA．The larger the SD,the higher the pHФ value．Bovine serum albumin (BSA) was selected as a model protein,and its entrapment and release behavior from HP/ACS complexes were investigated．The results show that the entrapment efficiency of BSA is very high(～100％),and the BSA release is extremely pH-dependent．The transition of BSA release can occur within a rather narrow pH range(Ф) can also be modulated by SD．It seems that the BSA release transition is correlated with HP/ACS complexation．In addition．the sustained release of BSA from the complex can be achieved at pH 7.4 and the releabe duration can be up to 15 days．  
          
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        发布时间：2021-03-19
      • HUANG Li,JIANG Wei,AN Lijia,JIANG Shengxiang
        Issue 4, Pages: 529-534(2005)
        摘要：Epoxidized ethylene propylene diene (eEPDM) was prepared in the lab．Then it was used to toughen poly (butylene terephthalate) (PBT) by meh blending．For the blend with 24 wt％ eEPDM content,the impact strength is 12 times of that of pure PBT．Moreover,the brittle．ductile transition could be found by increasing eEPDM content at room temperature However,for PBT/uEPDM (unepoxldized EPDM) blends,the impact strength remained briefly unchanged with increasing the rubber content．It was obtained that the critical interparticle distance (IDe) of the PBT/eEPDM systems is 0.49μm Moreover,the addition of EPDM led to the decreasing of the brittle-ductile transition temperature (TBD) of PBT/EPDM blends．The difference between the brittle-ductile transition temperatures of PBT/uEPDM and PBT/eEPDM blends increased considerably with increasing EPDM content．SEM photographs showed that dispersed eEPDM particle size was obviously smaller than that of uEPDM particle in PBT matrices．Moreover,the interparticle distance(ID) of the PBT,eEPDM blends was smaller than that of the PBT/uEPDM blends,which led to the occurrence of brittle-ductile transition of PBT/eEPDM blends at room temperature．  
          
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        发布时间：2021-03-19
      • CHEN Zhiyan,LI Xiaodong,WANG Jun,WANG Ge
        Issue 4, Pages: 535-539(2005)
        摘要：A polyferrocarbosilane(PFCS) was synthesized from low molecular weight polysilane and ferrecene．The synthesis techniques including reaction temperature,pyrolysis temperature and ferrocene content were investigated．The molecular weight and soft point of PFCS increase with raising reaction temperature,pyrolysis temperature,and adding more ferrocene．The most suitable synthesis conditions for PFCS ale as follows,reaction temperature 350-420℃．pyrolysis temperature 450～510℃．The reaction temperature and pyrolysis temperature decrease greatly because of adding ferrocene．PFCS was charactefized by element analysis,FT-IR and 1H-NMR．As a result,element iron was inducted to the polymer,and it seemed that the structure of PFCS is similar to that of colycarbosilane (PCS)．The silicon carbide ceramic obtained from PFCS shows some magnetic properties．  
          
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        发布时间：2021-03-19
      • ZHANG Linxi
        Issue 4, Pages: 540-543(2005)
        摘要：Statistical properties of folding sequences of two-dimensional compact protein were investigated by using the enumeration calculation method．The number of folding sequences SN, may be expressed as SN∝ 2N．Here 2N means the total number of sequences for N-monomer compact chains．For folding sequences,HH/NP≈1.197,here NH and NP represent the total number of hydmphobie(H) and hydrophilie (P) groups in all folding sequences． Comparisons with real proteins were also made．Distributions of folding sequences in all sequences according to the number of hydmphobie amino acid residues Were investigated,and they had the form of the Ganssion distribution．The cluster size and its distributions were also studied,and there existed a difference between folding sequences and random sequences．The coil-to-globule transition temperature Tc,estimated from the location of the peak on the heat capacity,depended on the chain length and was almost sequence independent．  
          
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        发布时间：2021-03-19
      • ZHANG Qizhen,LIU Jianqiang,TANG Xinde,ZHANG Jingzhi
        Issue 4, Pages: 544-548(2005)
        摘要：The photochemical behavior of a photochromic carbosilane liquid crystalline(LC) dendrimer of second generation (G2) in chloroform and tetrahydmfuran were described．Thirty-six 4-hexyloxyazobeazene mesogenic fragments were attached in its periphery．The maximum absorption wave length and molar extinction coefficient of G2 were determined．The reaction rate constants of trans/cis photochemical isomerization and positive/counter photochemical back-isomerization and the equilibrium constant of photochemical back-isomerization reaction for G2．G1 and M3 were discussed．Their absarbance A360 in CHCl3 and maximum absorption wave length λmax in CHCl3 and THF around 360 nm arc in G2>G1>M3 and G2max of G2 in solutions shows an order of DMF>C6H6>CHCl3>THF>EtOH．Their molar extrinction coefficient ε360 in CHCl3 and THF and their reaction ratio constant of photochemical isomerization kp in CHCl3 are in G2>G1>M3 and G2-1s-1,but that of the photochromic LC polysiloxanes containing the azobenzene moieties is 10-8s-1,thus the phomresponsive rate of the LC pbotoehromic dendfimer G2 is 107 timeslarger than that of the latter．  
          
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      • ZHANG Lu,WU Hui,SHI Yiping,FANG Zhuangxi,HU Ping
        Issue 4, Pages: 549-554(2005)
        摘要：Electrospinning technique was employed to obtain uhrafine fibers of poly (carbon dioxide-co-propylene oxide)．The effects of electrical potential,distance from spinning tip to collector,solution concentration and solvent system on the fiber morphology,fiber diameter and dispersion coefficient were discussed．Morphology and dispensability of electrospun nonwoven mats were determined by scanning electron microscopy (SEM)．The results show that fibers of poly(carbon dioxide-co-propylene oxide) with a diameter range from less than 200 nm to 7 μm can be obtained via electrospinning process．It was also found that the electrical potential and solution concentration were strongly correlated with the formation of bead defects in electrospun fibers．Bead defects oecured at low electrical potential and concentration and the form of the beads changed from sphere to spindle,when the electrical potential or solution concentration increased．Electrical potential,spinning distance and solution concentration were all foand to have great influence on the fiber diameter and dispersion coefficient．Below a certain value of electrical potential the average diameter of electrospun fibers increased and the dispersion coefficient decreased with increasing the electrical potential．However,when electrical potential at the spinning tip reached a relatively high value,the trend went opposite due to great instability caused by the high electrical force．With the increase of distance between spinning tip and conector,the average diameter of electmspan fibers declined,while the dispersion coefficient increased．When the solution concentration increased,the average diameter increased,while the dispersion coefficient declined．The results also illustrated that the solvent system may greatly affect the morphology of eleetrospun fibers．In the CH2Cl2 and butanone salvent system a bimodal distribution of fiber diameters was observed due to jet splitting．  
          
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      • TUO Xinlin,CHEN Di,WANG Xiaogong
        Issue 4, Pages: 555-559(2005)
        摘要：Building up the azo polydectrolyte (PEAPH)/PDAC self-assembled muhilayers was explored in N,N-dimethyl formamide (DMF)/H2O mixtures using the layer-by-layer electrostatic adsorption technique．The focus of studies was concentrated on the effect of the ratios of DMF to water in the mixtures on the growth．structure and surface morphology of the PEAPH/PDAC multilayere．Results show that DMF/H2O mixtures are ideal media for PEAPH/PDAC multilayer growth．The ratio of DMF to water in the mixture has significant influence on the muhilayer structure and surface morphology．With the increase of DMF content the multilayer thickness has better linear growth relationship with multilayer number and the muhilayer surface becomes snloother．As well．less azo chromophores exist in the H-aggregate style for multilayers fabricated from the DMF/H2 mixture with more DMF content．These studies demonstrate that it is an effective method to control the muhilayer construction by adjusting the medium properties and this method is useful for multilayer fabrication of water insoluble polyelectrolytes．  
          
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        发布时间：2021-03-19
      • HU Yanhong,LUO Yonghong,WAN Liqiang,QI Huimin,HUANG Farong,DU Lei
        Issue 4, Pages: 560-565(2005)
        摘要：Two monomers,bispmpargyl ether of bisphenol-A(BPEBA)and 4,4'-biphenyl dibenzyl azide (BPDBA) were synthesized and characterized with FT-IR,1H-NMR and elementary analysis．Their bulk polymerization was conducted in an oven,and a polytriazole was obtained by the 1,3-dipolar cycloaddition polymerization．The variation of the reactively functional groups during the polymerization was traced by FT-IR,the polymerizing reaction of BPEBA with BPDBA and its kinetics were investigated by using differential scanning calorimetry (DSC) at a variety of heating rates．Some kinetic parameters including the reaction order,activation energy and pre-exponential factor were obtained with the Kissinger and the Ozawa methods．The thermal stability of the polymer was evaluated with TGA．The results showed that BPEBA and BPDBA were easy to form polytriazole by 1,3-dipolar reaction．The polymerizing reaction happened at low temperature,i．e．70℃,the reaction was a one order reaction,the activation energy △E=84.6 kJ／mol．and the pre-exponential factor A=4.865×1010. min-1．The polymer exhibited good thermal stability．  
          
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        发布时间：2021-03-19
      • CHEN Zhongxiang,ZHANG Ruifeng,CHEN Shanmei
        Issue 4, Pages: 566-570(2005)
        摘要：Polyethersulfone (PES) microfiltration membranes can be produced from PES/polyethylene glycol(PEG)/ solvent systems by dry/wet phase inversion process．Some factors influencing pore size of microfiltration membranes are diseussod including kiads of solvent and the concentration of PEG and PES．The results indicated that the surface morphology and properties of miempomus membranes were determined by the concentration of PEG and PES．and the kind of solvent had little influence on the morphology of the membrane．In such casting solutions an increase of PEG concentration from 70％ to 80％ (by weisht) increased the viscosity of the solution significantly It also changed the size of polymer aggregates and the demixing rate of the casting solution in air and in water,therefore PES membranes having different morphologies were obtained．By adjusting the concentration of PES and PEG,mirofillitration membranes with various average pore size can be produced．  
          
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      • ZHANG Nairong,WANG Xianhong,ZHAO Xiaojiang,WANG Fosong
        Issue 4, Pages: 571-573(2005)
        摘要：Functional CO2-based copolymem were synthcslzed by ccopolymerization of CO2,propylene oxide(PO) and allyl glycidvl ether (AGE) in the presence of rare ealth ternary catalyst Y (CCl3COO)3／ZnEt2／Glycerine．The yied and performance of the polymerization products were influenced by the molar ratio of PO and AGE．The CO2-based copolymers were characterized by IR(1747cm-1C=O；1240 cm-1C一O一C),1H-NMR(δ=5.80～6.00(一CH一),δ=5.15～5.30(=CH2)),13C-NMR(δ=134.50(—CH=),δ=117.88(=CH2)),DSC and TGA.The results showedthat functional CO2-based copolymers with differentthermal properties could be pfepared by adjusfing the molar feed ratio of PO and AGE,and the glass transition temperature of products is adjustable from -15．4℃ to 36．1℃．  
          
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      • LIU Cheng,LIU Pengtao,WANG Mingjing,LIANG Qizhen,WANG Guoqing,JIAN Xigao
        Issue 4, Pages: 574-578(2005)
        摘要：A crank, non-coplanar heteroeyclie aromatic dicarboxylic acid,4-{4-[4-(4-carboxy phenoxy)phenyl] phenyl}-2-(4-carboxy phenyl) phthalazin-1-one (2),was successfully synthesized by the condensation of bisphenol-like monomer (DHPZ-pP) with p-ehlorobenzonitrile,followed by the alkaline hydrolysis of the intermediate dinitrile compound．A series of 4-biphenyl-4-yl-phthalazinone-based aromatic poly(aryl amide)s were prepared from the diacid 2 and various aromatic diamines by direct phosphorylation polycondensation．The intrinsic viscosities of polymers were in the range of 0.42～0.72 dL/g．Most of the poly(aryl amide)s were quite soluble in polar solvents such as N-methyi-2-pyrrolidone,N,N-dimethylaeetamide and N,N-dimethylsulfoxide．Some of them were even soluble in less polar solvents such as m-cresol and pyridine．The transparent,toush,and flexible films,east from the polymer solutions．possessed a tensile strength in the range of 80～89 MPa,an elongation at break of 6％～13％,and a tensile modulus of 1.59～1.92 GPa．The polymers possessed high thermal stability associated with glass-transition temperatures in the range of 298～328℃ and 10％ weight-loss temperatures in excess of 470℃ in nitrogen.  
          
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        发布时间：2021-03-19
      • LI Zaifeng,XU Chunming
        Issue 4, Pages: 579-583(2005)
        摘要：Investigation of structure for crosslinked PUU by FTIR showed that the band site for hydrogen bonded NH groups shifted to high wavenumbers,the absorbanee of the band of carbonyl for ordered urea link at 1642 cm-1 was weaker than that of linear PUU,and the absorbanee for the ordered urethane carbonyl wasn’t observed in the spectram for the crosslinked PUU,because of the presence of erosslinks．It was also observed that with the increase of temperature,the absorbanee of hydrogen bonded NH group decreased,while its band site shined to higher wavenumbers．The FFIR results revealed that the mixed degree of the micro hard phase was hisher than that of linear PUU．the resilenee of the erosslinked PUU was lower than that of the linear PUU,and with the increase of temperature,the hyarogen bond among the polar groups was easily destroyed,and the flexibility of the soft segment incleased．and the enhance of the resilenee for the erosslinked PUU was higher than that of the linear PUU The higher the erosslink density．the lower the resilenee of the PUU,and the heat buildup became strong with the increase of erosslink density and the hard segment content．However,the change of the extender molar ratio hardly affected the resilenee and the heat buildup,but it did improve the flexible fatigue properties of the PUU elastomers significantly．  
          
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        发布时间：2021-03-19
      • WANG Yunpu,YUAN Kun,PEI Xiaowei
        Issue 4, Pages: 584-588(2005)
        摘要：The nano-composite hydrogels were prepared by the radical graft copolymerization of N- isopropylacrylamide onto the surface of Nano-SiO2 particles treated with vinyhrimethoxysilane in a mixture solvent of H2O/THF at 25℃,and N,N’-methylene bisacrylamide (BIS) was used as the crosslinking agent The products were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy These composite hydrogels exhibit higher swelling ratio than the usual poly(N-isopropylacrylamide) hydrogels at fow temperature(15℃) and more excellent water release behavior at high temperature(50℃)．The swelling ratio of hydrogel H1,which has no nano-SiO2 component,is about 29 at 15℃,by contrast,the swelling ratio of hydrogel H4 which contents 5％nano-SiO2 component is about 35 at the sanle temperature At the same time,the water release behavior of hydrogel H4 shows an almost linear form,which is very essential to the controlled drug delivery systems．The reasons causing the properly improvement of the hydrogels were discussed．  
          
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      • ZHANG Zejiang,MEI Xiujuan,XU Chenghua,FENG Liangrong,QIU Fali
        Issue 4, Pages: 589-593(2005)
        摘要：Polystyrene/Mg-Al layered double hydroxides (LDHs) hybrid nanocomposites were synthesized by emulsion polymerization．The purposed nanocompesites synthesized under different conditions were characterized by the XRD curves．Then the formation conditions of exfoliated PS/LDHs nanocompesites were discussed by the XRD results at low angles．The SEM images were used to observe and analyze the dispersed behavior of the LDHs nanolayers leading to the conclusion that the LDHs nanolayers were exfoliated and well dispersed in these nanocompesites The thermal stability of these nanocomposites was discussed through the TG and DSC curves It was foundthatthe LDHs nanalayers can effectivelyincreasethethermal stabilityof PS．The glass transition temperature nf PS can be enhanced and improved by the well dispersed LDHs nanolayers．The limited oxygen index of the PS/LDH nanocompesites prepared by emulsion polymerization WaS much hish than that of the conventional mixture of PS and nanoo-LDHs at the same LDH content．  
          
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      • WANG Chunlei,YANG Bai,LI Dongmei,LI Minjie,HAN Kun,ZHANG Junhu
        Issue 4, Pages: 594-599(2005)
        摘要：Water-soluble CdTe nanocrystals welag prepared in the presence of 3-mesaptopropionie acid (MPA).By adding additional Cd2+ or poly (acrylic-acid)(PAA) to the solution,aggregates of CdTe nanocrystals were obtained．and their size varied with the amount of Cd2+ or PAA．Cd2+ or PAA have an important effect on the aggregation process of CdTe．Additional Cd2+ can accelerate the formates of aggregates by linking with earboxyl on different CdTe particles,while PAA also acts as a linker between CdTe particles．When the freshly prepared nanocrystal salutions were stored for a long time,the interaction between the carboxyl and Cd2+ on different particles would lead to the formation of CdTe aggregation．The aggregation process was also a process of surface passivation which led to the dmmatical increase of photoluminecence intensity．These results showed that the size of the aggregates could be contmned by adjusting various conditions of aggregation．  
          
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      • WANG Guocheng,FAN Zhiqiang,XU Junting
        Issue 4, Pages: 600-605(2005)
        摘要：The highest catalytic efficiency of styrene polymerization reached 7.7×103gPS/gTi·h by using MgCl2 supported spherical Ziegler-Natta catalyst systems(TiCl4·MgCl2／AlR3／diphenyldimethoxry silane)．13C-NMR analysis showed that the products were isotactic．The influences of polymerization conditions on molecular weight and molecular weisht distribution (MWD) were studied by fitting the GPC curves of isotactic polystyrene (iPS) with the Schulz-Flory“most probable”distributions．When triethylaluminium was used as cocatalyst．the produced iPS may have more low molecular weight fractions．iPS with narrow distribution was produced with triisobutylaluminium as cocatalyst．When molecular hydrogen was added in the system,the catalytic efficiency was increased and the MWD of iPS was strongly broadened．  
          
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      • ZHOU Chunhua,LIU Wei,ZHANG Shuxiang,LI Hui,CHU Guohong
        Issue 4, Pages: 606-610(2005)
        摘要：Fe3O4／P(NaUA-St-BA) core-shell magnetic composite nanoparticles were prepared by soapless polymerization of styrene and butyl acrylate in the presence of Fe3O4 magnetic colloidal particles coated with a reactive suffaetant NaUA and their diameter was about 10nm．The results of IR and TG analysis demonstrated that the desired polymer was bonded to the surface of Fe3O4 partieles．The morphology analysis by TEM confirmed that the composite particles had a core-shell structure and a relatively uniform diameter of about 60nm．The results of TG analysis indicated that the coating amount of NaUA and P(NaUA-St-BA) copolymer on Fe3O4 particles was 13.83％ and 71.85％．respectively The magnetic properties of the obtained composite particles were measured by VSM．and superparamagnetic properties was found Finally,the prepared magnetic composite particles latexes were stable for several months.  
          
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      • WANG Zhen,YANG Rui,XU Jun,XIE Xuming
        Issue 4, Pages: 611-616(2005)
        摘要：The crystallization of poly(3-hydroxybutyrate) (PHB) thin films was observed in situ by ATR (attenuated total reflection)-PTIR．The PHB films with different thickness were prepared by means of spin-coating on Al substrates,and then the isothermal crystallization of the PHB films at 200℃ was investigated in situ by ATR-FTIR The results revealed that the crystallization kinetics of PHB films was affected obviously by the film thickness．A reduction in the erystallinity as well as in the rate of crystallization was found with decreasing the film thickness．because the crystallization occurred under constrained geometry conditions．In addition,the effect of film thickness on the orientation of the molecules of the PHB crystals in the films was investigated by polarized ATR-FTIR．The results imply a preferred orientation of the polymer chain axis in the crystals along the surface-normal direction of the flints．The thinner the film thickness,the more the preferred crystalline chain orientation perpendicular to the film surface is.  
          
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        Research Bulletin

      • ZONG Qi,XIE Xuming
        Issue 4, Pages: 617-620(2005)
        摘要：Thin films of poly(methyl methaerylate)/polystyrene(PMMA/PS 80/20 W/W) blend prepared on glass substrate by spin-coating from a cosolvent,chloroform were studied．The formation of regular Voronoi patterns was found under phase contrast microscopy (PCM)．It Was observed that there were clear concave boundaries in the PCM images by atomic force microscopy (AFM)．Although the sample was annealed at 220℃ more than 7 h,no changes of the Voronoi pattern occurred,implying that the phase separation structure in the Voronoi pattern Was almost complete during spjn-coating process．It Was believed that the formation of this pattern was due to the convection during spin-coating procedure．  
          
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      • LU Lingbin,LIU Suqin,HUANG Kelong,XIAO Xuxian
        Issue 4, Pages: 621-624(2005)
        摘要：Some methods have been developed to use CO2 as the raw material to produce degradable polymeric materials．The terpolymer of carbonate(PPGC) synthesized with the terpulymerization of CO2,pmpylene oxide and γ-butyrolaetone(GBL)．GBL offered an ester structural unit making the eopolymer easier to hydrolyze．Hence,PPCG should be of good degradability．In order to study its degradability,the polymer PPCG was used as materials for drag loading．The drug-loaded mierospheres were obtained by the W/O/W type emulsions method．The mierespheres were spherical in shape with smooth surfaces and good dispersion．The drug loading and encapsulation efficiency were 36.7％ and 78.6％。respectively．The degradative behave was studied by SEM,XRD arid dmg release carves in different degradation medium were obtained．It was found that these microspheres could be degraded at faster speed in the basic media,while could not be degraded in the acidic media．The higher pH value of the medium was,the fasterthe initial degradative speed was．  
          
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      • TANG Liming,QIU Teng,YOU Hu,FANG Yu,TUO Xinlin,LIU Deshan
        Issue 4, Pages: 625-628(2005)
        摘要：Hyperbranched poly(ester-amine) (PEAC) with terminal acrylate groups aggregated into micelles in acidic methanol-water mixed solutions at a volume ratio 1：100．and the micellar size became large with increasing the solution pH value．Self-assembled films were successfully formed from hyperbranched polyester (PMPP) with terminal aromatic carboxylic acid groups and PEAC by layer-by-layer dipping and the process was affected by the pH value of PEAC solutions．With PEAC as the ouflayer,further reaction of the self-assembled film based on acrylate groups was investigated．The film was irradiated by UV light and washed byionizingwater．The cured film fell off the substrate seriously due to the highly branched architecture of PEAC and the polymerization of acryate groups．In addition,the self-assembled film was immersed in aqueous p-phenylenediamine solution for 72h．Regular spherical particles in diameter of 200 nm were observed on the film surface,which was due to the stroag arene-arene interaction of benzene rings introduced into the film surface through Michael addition between acrylate groups and amino groups in p-phenYlenediamine．  
          
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      • ZHENG Yansong,SHEN Zhiquan
        Issue 4, Pages: 629-632(2005)
        摘要：Homopolymerization of 4-vinyl pyridine(4-VP) and copolymerization of 4-VP with styrene(St) weir, performed by catalyst systems composed of calix [4] arene-neodymium complex 2,di-n-butylmagnesium and hexamethvl phasphoramide．The molecular weight of P(4-VP) was gready affected by adding calix[4] arene-neoaymium complex,and high molecular weight of P(4-VP) was got by using calix [4] arene-neodymium complex．The highest molecular weight of P(4-VP) was as high as 4.65×106 obtained by using a catalyst system with 2.0×10-4 mol／L of calix [4] arene-neodymium complex,while the molecular weight of P(4-VP) was only 5.62×105 without calix [4] arene-neodymium complex．In addition,4-VP-St copolymers with different 4-VP contents were obtained in good yield．When styrene was polymerized first for a time period,and then 4-VP was added,4-VP-St copelymers with 4.85mol％～23.3mol％of 4-VP units were obtainod,but when 4-VP and styrene were added at the same time the resultant 4-VP-St copolymers had 44.0mol％～66．3mol％of 4-VP units．  
          
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      • ZHAO Jianyi,WANG Chengyang,LI Tongqi
        Issue 4, Pages: 633-636(2005)
        摘要：To increase the dispersion stability of carbon black in water,polymers with sulfonic acid groups were grafted onto the surface of carbon black．Under the effect of ultrasonic wave,sodium allyl sulfonate (SAS) and 2-acrylamido-2-methyl propane sulfonic acid (AMPS) were copolymerized with acrylic acid and grafted onto the surface of carbon black,respectively by means of redox of eerie ion and nitric acid．The copelymerization conditions and dispersion stability of grafted carbon black were discussed in detail．It was found that the introduction of sulfonic acid groups improved the dispeion stability of carbon black in water obviously．It was also noticed that AMPS was easier to copelymerize with acrylic acid compared with SAS．For obtaining the highest grafting percentage,SAS and AMPS both had an optimal quantity when the weight of acrylic acid was constant and the ratios of them to acrylic acid (in weight) were within 0.15～1.0．  
          
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      • LIU Wentao,TIAN Xingyou,ZHENG Jin,CUI Ping
        Issue 4, Pages: 637-640(2005)
        摘要：The photoluminescence spectrum of poly(ethylene terephthalate) (PET) excited by light with wavdength in the reign from 260 to 360 nm was investigated．When the excitation wavelength was shorter than 300 nm,it was observed that the profile and structure of the photoluminescence spectrum of PET did not change with the increase of the excitation wavelength．When the excitation wavelength was longer than 300 nm,the wavelength dependence of the spectrumwas observed．Excited in the reign from 300 nm to the value that was a little larger than the maximum excitation wavelength,there was only one main peak at 367 nm in the photoluminescenee spectrum．However,with the continued increasing of the excitation wavelength,another peak appeared at 387 nm and its intensity increased accompanying with the decrease of the intensity of the peak at 367nm．At last,the peak at 387 nm became the main peak andthe peakat 367 nm changedtothe second main peak．It was suggested that the photofuminescence of 367 nm and 387 nm would rather come from the excimeric emission and the ground state dimmer,respectively,than origin from the same emitting center.  
          
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