最新刊期
      卷 ， 期 3 ， 2005

        Rapid Communications

      • GAO Lingling,TONG Bin,YAO Guijun,DONG Yuping,ZHANG Maofeng,LAM Jacky Wing Yip,TANG Benzhong
        Issue 3, Pages: 313-316(2005)
        摘要：Full conjugated multilayer thin films fabricated by the alternate adsorption of partially doped polyaniline (PANI) as a polycation and water-soluble poly(4-carboxyphenyl)acetylene(PA) as a polyanion were used as nanoreactors to study the in situ preparation of PbS nanoparticles．First,the self-assembled mulfilayers were immersed in a l mol／L NaOH solution to fabricate a controlled content of free carboxylic acid binding groups．Chemical reaction within the polymer film was initiated by absorbing Pb2+ from a 0.4 mol/L aqueous solution of Pb(Ae)2 and followed by exposing the film to H2S gas．UV-Vis absorption studies reveal that the absorption spectral profilesof the films are dependent on the dipping time of the film in the Pb(Ac)2 solution．AFM and TEM microscopic examinations of the films reveal that PbS crystals with rhomboid structures are formed in the films．The particles of narrow size distribution stand vertically on the film plane．Due to being doped by PbS,the photoelectric conversion property of ultra．thin composite films．which can be measured with a conventional three．electrode photoelectroehemieal cell using 0.5 mol/L KCl solution as the supporting electrolyte．is improved obviously．The results show that the valHe of the photocurrent for an 8-layer film is 3 times higher than that of the original film．  
          
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        发布时间：2021-03-19

        Research Article

      • CHENG Jun,ZHANG Linxi
        Issue 3, Pages: 317-319(2005)
        摘要：The rate of intra-molecular contact formation in protein-like polymers was studied through calculating the probability distributionP(r) of the end-to-end distance of modeeules using a(310) lattice model of Kolinski It is found that the probability distributionP(r) is different for various amino acid sequences For the sequences of(H),and(P)x,the probability distribution P(r) has two peak vlues,however,for the sequence of (HP)x,it has only one peak value．The rate of intra-molecular contact formation,k,increases with increasing chain length N when Nk decreases with chain length N when N>11,and there exists a relation as follows：k～N-α where α is a parameter depends on the amino acid sequence of molecules．Our results also agree with the experimental ones,and this investigation can help us to undemtand the structure of globular proteins．  
          
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      • WANG Wei,LIU Lianying,HUANG Zhenhua,YANG Wantai
        Issue 3, Pages: 320-326(2005)
        摘要：Photoinitiated dispersion polymerization of acrylamide (AM) has been carried out in the media of aqueous tert-butyl alcohol (TBA) (TBA=50 vol％～80 vol％),using poly (acrylic acid)-graft-nonylphenoxypoly-(ethylene oxide)(PAA-g-NPEO) as a dispersant and 2,2-dimethoxy-2-phenylacetophenone as initiator．The evolution of the dispersion polymerization indicated that there was no induction period and a 90％ conversion could be obtained in 40 min．Influences of various parameters,such as medium polarity,monomer concentration,initiator concentration,dispersant concentration,incident light intensity,reaction temperature and layer thickness on molecular weight and particle size were investigated Polymers of high molecular weight,up to 6.5×106 were obtained According to the observation of TEM,most of the polymer particles clustered together or scattered with a unifoml size as in a typical dispersion polymerization system．  
          
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        发布时间：2021-03-19
      • LUO Binghong,QUAN Daping,LIAO Kairong,LU Zejian,ZHOU Changren
        Issue 3, Pages: 327-332(2005)
        摘要：Poly(poly(ethylene glycol)-co-L-aspartic acid) (PEG-ASP)n ahemating prepolymer was first prepared by the solution polycondensation from N-(benzyloxycarbonyl)-L-aspartic acid anhydride and poly(ethylene glycol)．Then,the novel PLGA-(PEG-ASP)n copolymers with pendant amine functional groups were synthesized by bulk ring-opening eopolymerization of D,L-LA with GA using tin octoate(Sn(Oct)2) as a catalyst,and (PEG-ASP)n prepolymer as a co-initiator．The structure and properties of the novel eopolymers were studied by GPC,FT-IR,1H-NMR and DSC,etc．Results showed that the PLGA-(PEG-ASP)n copolymers were typical amorphous polymers．The content of (PEG-ASP)n prepolymer had significant influence on the properties of the copolymers．The hydmphilieity of the eopolymers was improved and the value of the glass transition temperature(Tg) decreased as the content of the prepolymer increased．The benzyloxyearbonyl (CBz) protecting groups of the eopolymer were totally removed by catalytic transfer hydrogenation using palladium over activated carbon(5 wt％) as a catalyst and H2 as an effective hydrogen donor．The molecular welight,the value of Tg and hydrophilieity of the eopolymer were somewhat increased as the CBz protecting groups were removed．  
          
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      • ZHANG Kun,NI Zhongbin,CHEN Mingqing,CAI Jie,LIU Xiaoya,YANG Cheng
        Issue 3, Pages: 333-338(2005)
        摘要：Polymeric nanospheres consisting of poly(butyl methacrylate)(PBMA) cores and poly (ethylene glycol) (PEG) branches on their surfaces were prepared by free radical copolymefization of butyl methacrylate (BMA) and PEG macromonomer with a p-vinylbenzyl end group in ethanol/water mixed medium．It was found that the solvophilidsolvophobie balance between the copolymers and mediums had great effect on the formation of nanospheres．The obtmned polymer dispersion exhibited four kinds of states：clear solution,particle dispersion (milky solution),milky solution with gel/precipitation and gel with varying the BMA concentration and water content in the mixed medium．The particle size and morphology of obtained nanospheres were characterized by the transmission electron microscopy and laser ljghter scattering．The nearly monadispersed nanospheres with particle sizes from 40 nm to 500 nm could be obtained by eontroHing the BMA concentration and water content in mixed medium．  
          
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      • WANG Ruifang,SHI Zuoqing,SHI Rongfu,ZHANG Jingze,OU Lailiang
        Issue 3, Pages: 339-344(2005)
        摘要：Macropemus hypercmssllnked resins with high specific area and rigid framework could possibly still retain considerable specific area after being loaded with polar groups．Excellent resins with high specific area and high functional selectivity could be obtained by aminating macroporous hypercrosslinked resins A series of aminated adsorption resins have been prepared by loading different amidocyanogen groups on maeroporous hypercmsslinked polystyrene．The sorption of phenol and aniline on the synthesized resins in aqueous and nonaqueous solutions was investigated The result showed the selectivity of phenol in both systems increased with alkalescence increasing of the loaded amination In n-hexane solutions．phenol and aniline may form hydrogen bond with the hydrogen acceptor of the adsorbent．In aqueous solutions,the study on the adsorption of phenol from water has indicated that the interaction was a synergy of hydrongen bending and hydrophobie interaction．The study of dynamic adsorption of phenol and aniline in water onto a pre-aminated resin(Rfl8) and a quaternary ammonium resin (Rs6) showed that for Rfl8,phenol leaked out first at 147 bed volume(BV)．The content of effluent solution rose fast and saturated at 212 BV．Aniline leaked out at 184 BV and the content of effluent solution lose slowly．For Rs6,aniline leaked out first (17BV) and the content of effluent solution saturated fast (47 BV)．Phenol leaked out at 44 BV and the coateat of effluent solution also lose fast,and reached saturation at 79 BV.So in the range of 17～44 BV,aniline could be obtained.  
          
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        发布时间：2021-03-19
      • SHENTU Baoqing,WENG Zhixue,NISHIDE Hiroyuki
        Issue 3, Pages: 345-349(2005)
        摘要：The dissolution and diffusion puocesses of oxygen in and through poly(octyl methaerylate-co- vinylimidazole)(OIm)/cobahporphyrin complexed membranes were discussed．Facilitated oxygen transport through a polymer membrane containing meso-α,α,α,α-tetrakis(o-pivalamidophenyl) porphyrinatocobah(CoP) as a fixed oxygen carrier was analyzed by a dual-mode transport model．It was found that CoP fixed in the solid membrane rapidly and reversibly bound with oxygen and the oxygen-binding equilibrium constants of CoP (K) was 14 mol-1 L The oxygen absorption for the CoP-OIm membrane obeyed a Langmuir-type isotherm,while the nitrogen absorption showed a proportional increase with nitrogen pressure according to Henry’s law．The physical solubility coefficient of oxygen (kD) in the polymer matrix was calculated to be 4.4×10-5 (STP) cm-3 Pa-1 according to the adsorption results．Oxygen permeability coefficients (Po2) of the OIm-CoP membranes steeply increased with a decrease in the pressure difference (Po2),while Po2 for the control membrane composed of inactive (oxidized) Co(Ⅲ) P Was small and independent of Po2,indicating that the CoP carrier fixed in the membrane interacts with oxygen and facilitates oxygen transport．The facilitation factor (G) that indicates the degree of facilitated transport was 9．The ratio of the diffusion coefficient of oxygen for hopping between the fixed earlSers (Dc) to the physical diffusion coefficient of oxygen thmugh the matric polymer (DD) was 0.08．  
          
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        发布时间：2021-03-19
      • TANG Jianguo,WANG Yao,HUANG Xingyi,BELFIORE Laurence A.
        Issue 3, Pages: 350-356(2005)
        摘要：The morphological structures and the related thermophysical propeRies of the complex differential of polyethylene oxide and lanthanide salts (Ln3+) were investigated by polarized optical microscope (POM) and differential scanning calorimeter (DSC)．The results showed that with the increase of molar ratio of Ln3+ salts to PEO,PEO spherulites were gradually demolished．When the molar ratio reached a critical value,for example,20,PEO spherulites completely disappeared．Different Ln3+ salts have different effect on PEO spherulites．The results of X-ray diffraction indicated the decrease of main peaks at 2θ=19.2° and 23.4° with the increase of Eu3+ salt concentration,which coincided with the data of DSC and POM．The characteristic of spherulites of complex samples was much weaker after vacuum drying at 600C than that at 23℃ in fume hood．Comparing the spherical structure of the original cast-drying sample,we found that the complex between PEO and Eu3+ remaimed after the first cooling． The melting point and heat of fusion of PEO decrease with the increase of Ln3+ concentration．When the concentration reached the related critical values,melting endotherms disappeared and melting points of PEO Were down to the lowest values．The change of FT-IR band at 1036 cm-1 confirmed the complex characteristic of the interaetion between PEO and Ln3+ salts.  
          
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      • HU Hui,LIU Yuyang,FAN Xiaodong,HUANG Yi
        Issue 3, Pages: 357-362(2005)
        摘要：Polymer beads containing β-cycledextrin(β-CD) were prepared by inverse emulsion polymerization,and then,the polymer beads with thermo- and pH sensitivities were synthesized by atom transfer radical polymerization (ATRP) using N,N-dimethylaminoethyl methacrylate (DMAEMA) as a functional monomer and anterior chloroacetylated β-CD as the initiator．Chain structure and their compositions for polymers grafting with poly(N,N-dimethylaminoethyl methacrylate)(PDMAEMA) were characterized using infrared spectroscopy,element analysis, DSC and TGA The thermo- and pH sensitivities for polymers containing β-eyclodextrin and PDMAEMA were inspected directly with a polarizing microscope equipping with a hot stage Finally,the controHed drug release behaviors of these polymersweYe studied using anti-cancer drugs,genistein (GNT) and chlorambucil (CLB) as model compounds Results show that the release efficiency for drugs depends on the pH value which can act as an“on-off”switch during the test It was indicated that a controlled drug delivery system could be established according to these experimental data．  
          
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        发布时间：2021-03-19
      • ZENG You,WANG Ruichun,ZHOU Benlian
        Issue 3, Pages: 363-367(2005)
        摘要：Smart hydrogels have been applied widely as sensors and actuators in many fields,such as artificial muscles,drug control release,fluid control and so on However,their further applications have been hindered by the slow respond rate and the critical surrounding medium．A macroporous nonionie poly(vinyl formal) hydrogel (PVFM) sensitive to water content,was synthesized by adding pore-forming agent．It showed a satisfied swelling/deswelling rate with the change in water content due to the presence of interconnecting pores．The swelling pressure of this hydrogel in water may reach its maximum within 80s．and the deswelling pressure of the swollen hydrogel may decrease to 5％ of its initial value within 4 h in the process of air-drying．Comparing with the conventional dense hydrogel,the maeroporous PVFM showed many different behaviors,the volume did not decrease with the loss of water, but a phenomenon of volume recovery occurred during the air-drying process．On the other hand,the compressive modulus of the macropomus hydrogel did not increase monotonously with the decrease of water content as that of conventional hydrogels did,but decreased about 47％ at the initial stage of drying process This abnormal behavior is mainly related to the load-bearing modes of macroporous gels is with different water contents．The rapid response of macropomus gels is attributed to the weaker interaction between polymer and water,the higber porosity and the elasticity recovery of network．Since the maemporous PVFM hydmgels show the rapid swelling/deswelling rate and the satisfied sensitivity of mechanical properties to water content,they have the large potentialities to be used as sensors and actuators in flow eontrol．humidity control and so on．  
          
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        发布时间：2021-03-19
      • SUN Shulin,XU Xinyu,YANG Haidong,ZHANG Huixuan
        Issue 3, Pages: 368-373(2005)
        摘要：Epoxy-funetionahzed ethylene propylene rubber(gEPR) was prepared in a eomtating twin-screw extruder．The degree of grafting of EPR was determined by FTIR measurements．The ohase structure．fracture morphology,toughening mechanism and mechanical properties of Nylon-6/gEPR blends were studied in detail．The resets show that the epoxy groups of gEPR van react with the carboxyl and (or) amine groups of Nylon-6 and form Nylon-6-co-EPR copoymer,which earl act as compatibilizer to decrease the interfaeial tension between Nylon-6 and EPR,and result in a more uniform dispersion of EPR in the Nylon-6 matrix．At the same time,the particle size of EPR decreases with the increase of the grafting degree of EPR．SEM observation of fracture surfaces indicates that Nylon-6/gEPR blends exhibit fractures of ductile mode,and from the SEM analysis of deformation zones it can be concluded that the cafitation of rubber particles and shear yielding of matrix are the main toughening mechanism．Mechanical tests also show that the addition of gEPR into Nylon-6 matrix improves the Ized no．bed impact strength of Nylon-6 significantly．  
          
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      • REN Minqiao,MO Zhishen,CHEN Qingyong,ZHANG Hongfang,SONG Jianbin,ZHANG Huiliang,SUN Xiaohong
        Issue 3, Pages: 374-378(2005)
        摘要：By combining the Avrami and Ozawa equations,a new kinetic equation for describing the non-isothermal crystallization process of polymers was obtained The comparison among the new method and other commonly used methods such as Jeziony and Ozawa methods was conducted with the syndiotactic 1,2-polybutadiene(st-1,2 PB) as an example The results suggested that the apparent Avrami exponent obtained by the Jeziony method can not predict the mechanism of non-isothermal crystallization of st-1,2 PB．The Ozawa method is also limited in obtaining the reliable kinetic parameters because of the substantial curvatures in the Ozawa plots．However,the analysis based on the new method gives a series of straight lines．According to the relationship among the new parameter a,the apparent Avrami exponent n．and the Ozawa exponent m in the new method,the mechanism of crystallization of st-1,2 PB can be predicated and the result is comparable with that obtained by the isothermal．crystallization．The new method is an effective method for dealing with the kinetics of non-isothermal crystallization of many polymeric systems,such as PEAKs,polyamides,polyolefins,poly(3-alkylthiophenes),poly(β-hydroxybutyrate) and some blending systems.  
          
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      • ZHAO Chenjing,AN Yingli,YIN Fenfang,ZHANG Wangqing,SHI Linqi
        Issue 3, Pages: 379-383(2005)
        摘要：The effect of polystyrene (PS) homopolymer on the diameter of mieelles self-assembled by polystyrene-b-poly(acrylic acid) (PS-b-PAA) in water was studied by dynamic laser light scattering and transmission electron microscopy．The results show that polystyrene can take part in the self-assembly of block copolymer PS-b-PAA in water and forms part of the core of the resulting core-shell micelles due to the affinity between the PS homopolymer and the PS block．because their structures are the same．The mieelles are generally inonodisperse when the content of the PS homopolymer is in a given region,as well as its molecular weight．Besides,it is also found that the size of the micelles can be controlled conveniently by adjusting the content and the molecular weight of the PS homopolymer The hydrodynamic diameter of the mieellels inereases from 60 nm to 95 nm as the weight ratio of the PS homopolymer to the PS block is inereased from 1/1 to 4/1．and inereases from 60 nm to 120 nm as the molecular weight ratio of the PS homopolymer to the PS block increases from 1/2 to 4/1．  
          
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        发布时间：2021-03-19
      • LU Lingbin,HUANG Kelong,HUANG Lu,YAN Wenbin
        Issue 3, Pages: 384-388(2005)
        摘要：Carbon dioxide is the primary contamination in the atnlosphere．In order to reduce the pollution caused by CO2,some methods have been developed to use CO2 as the raw material to produce degradable polymeric materials A new aliphatic polycarbonate (PPCG) was successfully synthesized with terpolymerization of carbon dioxide,propylene oxide(PO)and γ-butyrolaetone (GBL)．The copolymer was characterized bymeans of FTIR,1H-NMR and 13C-NMR．The results showed that the ring of GBL was opened and inserted into the chain of PO-CO2． GBL offered an ester structural unit making the copolymer easier to be hydmlyzed．The intrinsic viscosity,viscosity-average molecular weight (Mv),and glass-transition temperature(Tg) of eopolymers were determined．PPCG exhibited a Tg of around 40％,whichis higher than that of PPC The influence of reaction time and ratio of PO：GBL (mol／mol) on Mv and Tg of copolymer were tested The increase of reaction time may result in higher Mv and Tg.The total weight loss was used to characterize the degradation ability in hydmlysis tests．It was concluded that eopolymers of high GBL content exhibited good degradabilidy．  
          
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      • SHANGGUAN Yonggang,ZHENG Qiang,PENG Mao
        Issue 3, Pages: 389-392(2005)
        摘要：Crystalline morphology of polypropylene catalloys (PP-C) was studied by using polarized optical microscopy (POM) and wide-angle X-ray diffraction (WAXD) It was found that β-PP existed,in addition to α-PP,in the crystalline phase of PP-c. Crystallinity and the β-PP content for various PP-c were calculated The results revealed that the content of β-PP increased with the increase of the ethylene content in PP-c．whereas the crystallinity of PP-c gradually decreased．Compared with the isotactic polypropylene (iPP) crystallized at the same condition．the increase of ethylene content resulted in the variation of sphemlite growth and the decrease of crystalline perfection in PP-c．  
          
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      • LI Kanshe,WANG Qi,CHEN Yinghong
        Issue 3, Pages: 393-397(2005)
        摘要：Solid-state shear compounding technology(S5C) based on pan-milling is an effective method to prepare polymedgraphite electrical conductive composites with nano intercalating structure．The graphite nanosheets may touch each other to form a conductive network,and the intercalating graphite layers with nano scale gaps may induce tunnel current．therefore the percolation threshold value of the composites decreases remarkably,and their electfical conductivities increase quite a lot at low graphite loading levels．Compared with the PP／graphite composite prepared via conventional melt mixing,the percolation threshold of the PP／YEP250 nanocomposites prepared via S3C decreases from 4.3 vol％ to 0.55 vol％,and their conductivity is in 10 magnitudes of order higher than that of conventional PP/graphite composites at a graphite content of 4.01 vol％．  
          
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      • XIN Xiuqiang,WANG Yanmei,PAN Caiyuan
        Issue 3, Pages: 398-402(2005)
        摘要：Poly(2-(dimethylamino) ethyl methaerylate (PDMAEMA) and poly(2-(dimethylamino) ethyl aveate (PDMAEA) were prepared by using chain transfer agents (CTA),dithioesters (2-(ethoxyearbonyl) prop-2-yl dithiobenzoate (ECPDB),eumyl dithiobenzoate (CDB) and 1-phenylethyldithiobenzoate (PEDB) respectively,through reversible addition-fragmentation chain transfer (RAFT) polymerization．The molecular weight and molecular weight distribution of PDMAEMA and PDMAEA．were measured by gel permeation chromatography (GPC) and nuclear magnetic resonance spectrometer(1H-NMR)．The results showed the molecular weight distribution of PDMAEMA was narrow when the ECPDB/AIBN and CDB/AIBN as the initiator respectively．But the theoretical number average molecular weight Mn.th was not in good agreement with Mn.NMR and Mn.GPC. It demonstrated that the molecular weight of polymers could not be controlled．Its reason is probably that the balalive of the reversible addition-fragmentation chain transfer is disturbed by unapt match of monomer and CTA．With changing monomer or CTA,the molecular weight of polymers can be controlled．Compared with the CDB/AIBN system,the molecular weight distribution of PDMAEA by using PEDB/AIBN was narrower,and the molecular weisht was controllable．  
          
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      • DAI Xinhe,PENG Jing,ZHAI Maolin,QIAO Jinliang,WEI Genshuan
        Issue 3, Pages: 403-407(2005)
        摘要：In order to produce transparent HIPS,the methyl methacrylate(MMA) was used to copolymerlze with styrene (St) by using chemically initiated prepolymerization followed by radiation-induced polymerization at room temperature．The influence of the absorbed dose and dose rate on the molecular weight of P(St-co-MMA) copolymers was investigated．The chemical structure of resulting P(St-co-MMA) copolymers was confirmed by using FTIR,1H-NMR and DSC．In addition．the transparency of copolymers was measured by means of a UV-Vis spectrometer．and their mechanical strength was compared with that of the pure PS．Experimental results show that it is helpful to obtain the high molecular weight copolymers by increasing the conversion of prepolymefization and decreasing the dose rate．With increasing the absorbed dose,the accelerated polymerization occurred,and molecular weight of copelymers reached a maximum,then decreased slighdy with the dose．The synthesized P(St-co-MMA) copolymers were identified to be ataetic polymers and they have nsrrow polydispersity of molecular weight．Comparing with pure PS,the copolymer has higher mechanical strength and better transparency,particularly the toughness was improved significantly．Therefore,transparent P(St-co-MMA) copolymers with high mechanical performance could be produced by combining chemical initiation polymerization and radiation-induced polymerization．The process is easy to control and will be expected to be used for preparing transparent HIPS.  
          
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      • CAO Yanxia,ZHENG Qiang,DU Miao
        Issue 3, Pages: 408-412(2005)
        摘要：The study on the dynamic rheologieal behavior at molten state for ethylene-propylene-diene terpolymer (EPDM) was conducted with an advanced rheometrie expansion system (ARES)．It was found that dynamic rheological functions such as dynamic storage modulus(G’),dynamic loss modulus(G″) and dynamic loss tangent (tanδ) at low frequency region can sensitively reflect the change of structure of EPDM．On the basis of the difference of dynamic rheologieal properties between virgin and antioxidant-added EPDM,the characteristic rheologieal behavior of EPDM subjected to annealing was attributed to the thermo-oxidation of EPDM at molten state．The results measured by rheologlcal tests revealed that within the temperature region from 200℃ to 220℃ the thermo-oxidation of EPDM could be detected distinctly．  
          
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        发布时间：2021-03-19
      • ZHU Fangming,YANG Yijia,LIN Shang'an
        Issue 3, Pages: 413-416(2005)
        摘要：Ethylene and propene were homo-and copolymerized with monotitanocene catalyst composed of η5-pentametbylcyclopentadienyhrichloride titanium (Cp*TiCl3) activated by modified methylaluminoxane (mMAO)．Influences of copolymerization conditions including ethylene/propene molar ratio in the feeding,polymerization temperature and Al/Ti molar ratio on activity．propene content in copolymers and the triad and tetrad sequence distributions were investigated．The monomer reactivity ratios rE and rP(E = ethylene,P = propene) for ethylene/propene copolymerizations were estimated from the 13C-NMR spectra At high propene content in the feeding,the Cp*TiCl3/mMAO catalyst gave rise to rErP≈1 in combination with a resultant random copolymer．Whereas,at low propene content in the feeding,the eopelymer exhibits a tendency toward ahemating comonomer distribution (rErP <1),which indicates that propene suquences are isolated in the copolymer The thermal properties of eopolymers determined by DSC are mainly dependent on the pmpene content in the copolymers．  
          
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        发布时间：2021-03-19
      • XIONG Mingna,ZHOU Shuxue,CHEN Hui,WU Limin
        Issue 3, Pages: 417-422(2005)
        摘要：Acrylic resin/titania organic-inorganic hybrid materials were successfully prepared by the in situ polymerization of acrylic monomers as well as by blending the synthesized thermoplastic acrylic resins with titania sals which were first prehydrolyzed from the precursor of Ti(On-Bu)4．Effects of the amount of water and acid used for the preparation of TiO2 sols,the —COOH content in the acrylic resin and preparing methods on the structure of hybrid materials were investigated The Soxhlet extracting experiments proved that erosslinking reactions took place between the organic phase and the inorganic phase．leading to homogenous and transparent hybrid systems．Meanwhile．higher —COOH content resulted in higher crosslinking degree．The SAXS results showed that there existed titania networks with a loose structure and nano-scale size within the hybrids．Moreover,larger amount of water and acid in the sol-gel process led to larger size and denser titania organic phase In comparison with the in situ polymerization,blending method could prepare more homogeneous hybrids with mono-dispersed titania.  
          
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      • CUI Yuanchen,ZHANG Lei
        Issue 3, Pages: 423-426(2005)
        摘要：Sesbania gum supported palladium compound was synthesized with simple method and characterized by XPS,IR,TG,DTA,TEM etc．It was found that the sesbania gum supported palladium compound is an efficient catalvst for Heck reaction of acrylic acid,stvrene and acrylamide with aryl iodide such as iodobenzene,4-iodotoluene．4-iodoanisole,1-chloro-4-iodobenzene at atmospheric condition．The substituted trans-cinnamic acid,trans—stilbene and trans-cinnamoylamide was obtained in high yield (≥85％)．The sesbania gum supported palladium compound can be used repeatedly in the Heck reaction．The active center of the catalyst is metallic Pd．  
          
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      • KANG Kai,KAN Chengyou,DU Yi,LIU Deshan
        Issue 3, Pages: 427-431(2005)
        摘要：Monodispersed latex particles were synthesized by soap-free batch emulsion polymerization of methyl methacrylate(MMA),ethyl acrylate (EA) and acrylic acid (AA),and the anomalous structure in the particles were obtained after alkali posttreatment．Effects of AA amount and the mass ratio of MMA to EA on the latex properties before and after the posttreatment were investigated．Results showed that when AA amount was more than 0.04 mol,anomalous particles were generated and heterogeneity in the formation of anomalous structure was observed in the treated latices With the increase of amounts of AA and the decrease of the mass ratio of MMA to EA,the percentage of anomalous particles increased,and their volume expansion increased and then decreased．The edge of particles blurred and the anomalous structure was not obvious in TEM photographs as large amount of EA was used．  
          
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      • LIN Weixin,ZHANG Lili,ZHANG Huiping,CHEN Qun
        Issue 3, Pages: 432-436(2005)
        摘要：The morphollgy and molecular motion of in situ stretched poly (ether-ester) samples were studied by high-resolution solid-state 13C-NMR techniques Stretch-induced crystallization of the soft segment,i．e．ploy-(tetramethylene oxide)(PTMO),was observed at a draw ratio of 2.0．The degree of erystallinity of PTMO and the lamellar thickness of the crystallites were found to increase with increasing of draw ratio．The molecular motion at high frequency of the amorphous PTMO was found to be almost independent on the draw ratio．It was demonstrated that the stretch-induced crystallization mainly happens in the“pure”PTMO region．1H spin diffusion experiment was carried out on the sample with the draw ratio of 4.0．The thickness of the interfacial region between the amorphous and crystalline PTMO of the sample was estimated to be 1.1 nm,while that between the amorphous PTMO and the erystalline hard domain to be 3.1 nm．  
          
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      • XIN Lingyun,ZHANG Xiaogang
        Issue 3, Pages: 437-441(2005)
        摘要：camphorsulfonic acid doped polyaniline(PANI-CSA) nano-tubes and nano-fibrils fabricated by interfacial polymerization (IP) without templates The SEM and TEM images revealed that the average diameter of obtained polymer nano-tubes or nano-fibrils was about 100 nm．It is proved that the lower concentrations of aniline and dopant were liable to the PANI-CSA nono-tube or nano-fibrils formation．Furthermore,charging-discharging tests fevealed the good electrochemical capacitance performance of PANI-CSA nano-tubes．Their specific capacitance was as hish as 249 F/g at 5mA discharging compared to that of the fibrous PANI-CSA (217 F/g at 5mA) and the granular PANI-CSA(176 F/g at 5mA)．  
          
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      • MA Xiaoguang,LIU Yue,CUI He,ZHU Yuyang,XIAO Ru,Gu Lixia
        Issue 3, Pages: 442-447(2005)
        摘要：A series of modified-polyester hollow fibers were prepared by blend spinning of PET and a PET-based- co-polyester with different content of sodium 5-sulfonate-isophthalic acid with spinnerets for different cross section shape of biers．The tensile strength of the fibers first decreased with their sulfonate group content and then leveled off．The,dye-uptake of fibers to Basic Blue GB was improved with the increase of the sulfonate group content,and it did not show obvious influence on the uptake of disperse dyes．The dye-uptake of the fibers was not affected by their cross section shape,but greatly influenced by alkaline hydrolysis．The water retention and water transmissibility of the modified fibers were closely related with the micmcellular structure of fibers formed after alkaline hydrolysis and the capillary effect among profiled fibers．  
          
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      • PANG Mingjuan,TANG Dingguo,QI Lu,CHEN Hui
        Issue 3, Pages: 448-452(2005)
        摘要：A terpolymer PAMA was synthesized via emulsion polymerization with monomers of acrylonitrile(AN), methyl methacrylate(MMA),and acrolein(A)．The terpolymer PAMA was blended with poly(vinylidene fluoride-hexafiuoroylene) (PVDF-HFP),and nanometer SiO2 was added to the system．The micmpomus film was prepared by phase-immersion technique．SEM,adoption,thermal properties were used to characterize the fihns,and conduction properties were investigated The studies showed that the addition of SiO2 increased the pore volume,benefited the pore distribution and enhanced the uptake of liquid electrolyte；the composition of terpolymer PAMA,mainly the units of acrolein and acrylonitrile,affected the properties of the films significantly；the uptake of liquid electrolyte increased with increasing PAMA content The ionic conductivity of the polymer electrolytes reached 2.30×10-4s/cm.  
          
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      • GAO Baojiao,WANG Xupeng,LI Yanbing
        Issue 3, Pages: 453-457(2005)
        摘要：The polymerization kinetics of sodium p-styrenesulfonate (SSS) in aqueous solution has been studied with dilatometer method,the polymerization rate equation was determined．and the polymerization active energy was measured．At the same time,the behavior of the copolymerization between SSS and aerylamide (AM) have also been studied,the composition of the copolymer was determined using the complex reaction conductometric titration method which was founded previously by us through complex reaction of anionic polyelectrolyte with a surfactant cetyl trimethyl ammonium bromide (CTAB)．And the reactivity ratios of SSS and AM were determined．The results show that the polymerization rate equation for SSS is i>Rp=k[M]1.0[I]0.53,which displays that the chain termination reaction is according to the bimolecular termination mode,and the inititate process is independent of monomer concentration,andthe apparent polymerization active energy is 84.97 kJ·mol-1．The reactivity ratios of SSS and AM was calculated by using the Kelen-Tudos method,and they afe rsss=0.27 and rAM=2.21 respectively． Furthermom,the Q and e values of SSS were calculated by usingthe empirical equation of Alfrey-Price,and they are Q=0.22 and e=0.46．respectively．  
          
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      • WANG Linge,HUANG Yong
        Issue 3, Pages: 476-480(2005)
        摘要：Liquid crystals are always composed of anisotropic constituents．In the presence of an electric or magnetic field,the arrangement of liquid crystalline molecules may be varied according to their different dielectric or diamagnetic anisotropy．The effect of a high nmgnetic field (9.4 T) on the cholestefic structure of ethyl cellulose (EC)/dicholroacetic acid (DCA) was investigated．The direction of cholestefic helix axis aligned parallel to the direction of the magnetic field after the cholesterie solutions with fingerprint texture was treated in the magnetic field．It indicates that the diamagnetic anisotropy of the EC molecules is negative,which is caused by the conformation of the β-D-glucose backbone of the cellulose molecule.  
          
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        Research Bulletin

      • XIAO Yuting,CHEN Mingqing,LU Tianhong,MITSURU Akashi,HUA NG Xiaohua
        Issue 3, Pages: 458-462(2005)
        摘要：The N-isopropylacrylamide and acrylic acid copolymerlc microgel was prepared by dispersion polymerization The complex of micmgel containing terbium (Ⅲ) was prepared and characterized by dynamic laser scaRering(DLS),UV spectrum,FT-IR and Fluorescence spectrum．The DLS results indicated that the particle radium decreased from 120 nm to 90 nm after the terbium adding into microgel．In the UV spectrum,the main absorption peak was red shifted from 204 nm to 210 nm,correspondingly,the peaks of carbonyl groups and the amino groups of the microgel also underwent a red shift in FT-IR spectrum by adding terbium (Ⅲ) ions．The above measurements indicated that the terbium ion could bind with the oxygen atom in carbonyl groups and the nitrigen atom in amino groups of microgel．The fluorescence spectrum showed that the Tb(Ⅲ)-microgel complex possesed a good fluorescence properties showing the characteristic emissions of terbium(Ⅲ) ions and the complex exhibited the strongest fluorescence emission at 0.6％ ration．  
          
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      • LIU Yongjun,SONG Caisheng,FU Changqing,YE Shanghui
        Issue 3, Pages: 463-466(2005)
        摘要：Poly (aryl ether ether ketone ketone) (PEEKK) is a kind important high-performance polymers due to their excellent thermal stability and other outstanding properties similar to PEEK and PEKK．However,the PEEKK’Sinsolubility in common solutions and high melt point restrict its processing and applications．In this paper,a series of random eopolymers composed of poly(aryl ether ether ketone ketone)(PEEKK)/poly(aryl ether ketone ether ketone ketone) containing bis(o-metheyl) moiety (DM-PEKEKK) were prepared by low temperature solution polyeondensation of 4,4'-bis(2,6-dimethylphenoxy) diphenylketone (o-M2DPOBP),1,4-dipheoxylbenzene(DPB) and terephthaloyl ehlorde(TPC) in 1,2-diehloroethane with the presence of AlCl3 and DMF．The copolymers were characterized by FT-IR,DSC,WAXD,TGA,etc．The results show that glass transition temperature increases greatly with the increasing of the ratio of o-M2DPOBP/DPB,while melting temperature and erystallinity of copolymers decrease．The solubility of the eopolymers is improved greatly,while the eopolymers still exhibit excellent thermostability．  
          
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      • MA Hengyi,WEI Genshuan,ZHANG Xiaohong,LIU Yiqun,HUANG Fan,QIAO Jinliang
        Issue 3, Pages: 467-470(2005)
        摘要：A nitrile butadiene elastomeric nanoparticle (NBENP) was used for modification of resol phenolie resin．The reaction between NBENP and resol was measured by FT-IR．and the curing behavior of resins was charactered by DSC．The mecanical and thermal properties of modified resins were measured．Fracture surface of modified phenolic resin was observed by SEM The resuhs showed that,the impact strength,flexural strength and heat resistance of NBENP modified phenolic resin were increased at the same time A strong interface adhesion was formed because of the reaction between hydroxymethyl of resol and NBENP．This special interface conduces to transmission of stress when materials were loaded,and inhibition of deformation and decomposition of phenolic matrix when heated．The microcrack．initiated with rubber particle,and cavitation of rubbers might be the main reason for increase in tollghness．The honeycomb structure in fracture surface might be another possible reason for excellent mechanical properties．  
          
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      • LIU Yuyang,FAN Xiaodong,SUN Le,QIAO Wenqiang
        Issue 3, Pages: 471-475(2005)
        摘要：A poly(N-isopropylacrylamide)/β-Cyclodextrin (PNIPAM/β-CD) ionic polymer was synthesized by the reaction of poly (N-isopropylacrylamide-co-aeryl acid) (poly (NIPAM-co-AA) with mono-6-ethanolamine-β-eyclodextfin(EAA-β-CD)．EAA-β-CD was synthesized via the reaction of mono-6-OTs-β-CD (Ts=P-toluensulfonyl) with EAA The ionic polymer was characterized by means of FT-IR and UV-Visible spectroscopes,and DSC．The result shows that the formation of ionic interaction between poly(NIPAM-co-AA)and EAA-β-CD leadsto anincrease of the glass transition temperature(Tg) of poly(NIPAM-co-AA)．In addition,not onlytheionic polymer exhibits a well-defined lower critical solution temperature (LCST),but also β-CD on the polymer backbone vail be modulated by changing the pH values．as compared with β-CD-conjugated polymers with covalent bonds．Also,β-CD can easily be bound to the polymer backbone in form of free,or inclusion complex．It is expected that the polymer may find some useful applications such as dmg delivery system．  
          
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