最新刊期
      卷 ， 期 7 ， 2007

        Research Article

      • LI Shengfang,YANG Yajiang,YANG Xiangliang,XU Huibi
        Issue 7, Pages: 593-598(2007)
        摘要：The semi-IPN hydrogels of poly(acrylic acid-acrylamide-butyl methacrylate) and amylose were prepared using 4,4′-bis(methacryloylamino)azobenzene (BMAAB) as a crosslinker.The swelling behavior and degradation of hydrogels air-dried and freezed-dried both were investigated by immersion in buffer solutions of pH=2.2 and 7.4.The results indicate that both types of gels follow the Schott second-order swelling kinetics.Diffusion of water in gels was a non-Fickian process,having a combinational mechanism of diffusion of water molecules and relaxation of the macromolecular chain.However,the diffusion mechanism was dominative for freezed-dried hydrogels.The equilibrium swelling ratio of freezed-dried hydrogels increases remarkablely in pH=7.4 buffer solutions,but almost no change in pH=2.2 buffer solutions.The degradation of gels was carried out in the presence of colon suspension.SEM and degradation of hydrogels show that the degradation ratios of freezed-dried and air-dried gels were 35.3% and 28.1% within 5 days,respectively.It indicates that the degradation can be enhanced in the colon for gels treated by the freezed-dried method.  
          
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        发布时间：2021-03-19
      • LIU Bingbing,CAO Yiming,YUAN Quan
        Issue 7, Pages: 599-603(2007)
        摘要：ZSM-5 zeolite-incorporated chitosan membranes were prepared by the solution blending method.The membranes were characterized with scanning electron microscopy (SEM) to assess their surface morphology.The results showed that zeolite was uniformly distributed in the membrane matrix and the membranes were free of possible defects.Sorption studies indicated that the degree of swelling increased with the zeolite content,increasing,and the separation selectivity of dimethyl carbonate (DMC)/methanol mixtures was dominated by solubility selectivity rather than diffusivity selectivity.Finally,the effects of zeolite content and operating temperature on pervaporation properties were investigated.With increasing the zeolite content,the permeation flux of the membranes increased significantly.From the temperature-dependent permeation values,the Arrhenius activation parameters were estimated.The pervaporation results indicated that the membranes incorporated with the ZSM-5 zeolite exhibited better separation properties for DMC/methanol mixtures comparing with homogeneous chitosan membranes.  
          
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        发布时间：2021-03-19
      • WANG Ya,LI Jingqing,ZHAO Yunhui,SHENG Jing
        Issue 7, Pages: 604-608(2007)
        摘要：The phase formation and development of polypropylene/polystyrene (PP/PS) blends during mixing were investigated by pattern analysis of scanning electron microscopy.The effect of compatibilization of styrene-ethylene-propylene block copolymer (SEP) on polypropylene/polystyrene (PP/PS) was proved by small angle laser scattering (SALS),which confirmed the validity of SALS to describe the morphology of blends.The morphology development was investigated by analysing the variation of phase dimension dg.Further,the fractal character of distribution of phase dimension was examined in terms of distribution function to study the dynamics of phase dispersion.  
          
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        发布时间：2021-03-19
      • WU Defeng,CAO Jian,WU Lanfeng,ZHANG Ming
        Issue 7, Pages: 609-614(2007)
        摘要：The maleic anhydride grafted polypropylene （PP-g-MAH） was used as a compatibilizer to improve the immiscible phase morphology of polypropylene/poly(ethylere terephthalate)(PP/PET) blends.The effect of PP-g-MAH on the phase morphology and structural rheology of the blends was studied.The results show that for PP/PET blends with PET-rich composition,the addition of PP-g-MAH reduces the dispersed PP particle size remarkably,leading to large change in the shape relaxation and deformation as well as break-up behavior of PP drops.For PP/PET blends with the components around the phase inversion point,the coexistence of phase morphology of `sea-island' and cocontinuous structure disappears with addition of PP-g-MAH.The enhancement in dependency of low-frequency modulus on frequency also indicates that phase interactions increase due to the compatible effect.However,for PP/PET blends with rich PP component,the addition of PP-g-MAH nearly has no influence on both the morphology and rheology.  
          
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        发布时间：2021-03-19
      • FU Haitao,YANG Daling,ZHANG Shouhai,YANG Yongqiang,JIAN Xigao
        Issue 7, Pages: 615-620(2007)
        摘要：Poly(phthalazinone ether sulfone ketone)(PPESK) hollow fiber membrane for gas separation was prepared by dry/wet phase inversion technique in water.The cloud point titration method and the calculation based on linearized cloud point (LCP) curve correlation were employed in the research of the phase separation of PPESK ternary spinning solution.In the PPESK/N,N-dimethylacetamide (DMAc)/gamma-butyrolactone (GBL) and PPESK/DMAc/propionic acid (PA) systems,the theta composition of nonsolvent additive (NSA)/DMAc solvent mixture was determined according to Elias's method.The results showed that the experimental cloud points and the calculated binodal lines based on LCP had a good agreement in the systems of PPESK/DMAc/PA and PPESK/DMAc/water.From the thermodynamics stability of spinning solution and the final performance of hollow fiber membrane,conclusion could be drawn that higher the thermodynamics stability of spinning solution was,higher the gas selectivity of ultimate membrane was.The theta composition of NSA/DMAc solvent mixture played a very important role in the membrane forming.When the NSA content of spinning solution was lower than its content at theta composition,the performance of membrane was excellent,but when the NSA content was higher than the theta composition,the performance of membrane droped sharply.The PPESK hollow fiber membranes had fine mechanical properties.  
          
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        发布时间：2021-03-19
      • WU Chunrui,ZHANG Shouhai,YANG Fajie,JIAN Xigao
        Issue 7, Pages: 621-626(2007)
        摘要：Thermal stable composite membranes were prepared through the interfacial polymerization of m-phenylene diamine (MPD),piperazine (PIP) and trimesoyl chloride (TMC) on poly(phthalazinone ether) ultrafiltration membrane.The effect of the proportion of PIP and MPD in aqueous phase on the chemical structure of the active layer polymer,surface morphology and separation properties of the composite membranes was studied.The results showed that the average roughness of the surface of the composite membranes increased from 17.8 nm to 71.9 nm,the rejection for NaCl solution increased from 26% to 99%,while the flux decreased from 130 L·m-2·h-1 to 12 L·m-2·h-1,as the proportion of the monomers MPD/PIP increased from 0/100 to 100/0. The flux of the membranes trebled as the operating temperature increased from 25℃ to 80℃,while the rejection kept constant,which testified the good thermal stability of the membranes.  
          
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        发布时间：2021-03-19
      • ZHANG Xin,GAO Baojiao,ZHU Yong,LIU Qing
        Issue 7, Pages: 627-632(2007)
        摘要：Quaternary polyethyleneimine(QPEI) was prepared via two procedures of macromolecular reactions,tertiary amination and quaterisation,and the antimicrobial properties of this polymeric quaternary ammonium salt were mainly studied by using Escherichia Coli as a disease-leading bacterium.The effects of quaternary degree and pH value on the antimicrobial properties were examined with the method of plate counting living bacterium,and the antimicrobial mechanism of QPEI was studied more deeply via measuring the activities of β-D-galactosidase.The experimental results indicates that QPEI possesses very strong antimicrobial ability,and the antimicrobial ratio can reach 100% when QPEI is contacting with a bacterium suspension of 109 CFU/mL under the conditions of a contacting time of 4 min and a dose of 15 mg/L.The cationic degree of QPEI influences its antimicrobial properties to a great extent,and the higher the cationic degree is,the stronger the antimicrobial activity.In a certain region of pH values,the higher the pH,the stronger the antimicrobial ability is.The results of measuring activities of the enzyme of β-D-galactosidase shows that the antimicrobial mechanism of QPEI is based on a sterilizing bacterium process,and is not only based a restraining action.  
          
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        发布时间：2021-03-19
      • NIE Min,WANG Qi,QIU Guihua
        Issue 7, Pages: 633-637(2007)
        摘要：Ultrasonically initiated emulsion polymerization of styrene was carried out in the presence of the volatile hydrogen radical scavenger CCl4. With addition of CCl4 the polymerization rates first increased and then decreased.The increase of H2O2' yield and the decrease of pH and the produced polystyrene's molecular weight in the presence of CCl4,and the effect of non-volatile hydrogen radical scavenger on ultrasonically initiated emulsion polymerization of styrene indicates that the observed enhancement can be explained as follows.CCl4 may enter cavitation bubbles and further react with hydrogen radicals (·H) from the sonolysis of water to produce new radicals ·CCl3,so as to reduce the recombination of ·H and ·OH.Therefore more radicals would be present in the systems for initiating polymerization.In addition,the effect of CCl4 on ultrasonically initiated emulsion polymerization of methyl methacrylate(MMA) was studied.The results showed that CCl4 did not significantly enhance the ultrasonically initiated emulsion polymerization rate of MMA due to high vapor pressure and solubility of MMA,which would reduce the efficiency of CCl4 scavenging ·H.  
          
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        发布时间：2021-03-19
      • ZHANG Qingsong,ZHA Liusheng,MA Jinghong,LIANG Borun
        Issue 7, Pages: 638-643(2007)
        摘要：Adopting inorganic clay (hectorite) as physical cross-linking agent,a series of temperature-sensitive microgels were synthesized via the surfactant-free emulsion polymerization method.The chemical structure and global shape of the microgels were confirmed by FTIR,XRD and SEM,respectively.The temperature-sensitive behavior of the microgels was investigated by QELS and DSC.It was concluded that the clay used could act as an effective multifunctional cross-linking agent.In addition,the incorporation of tBA comonomer could tune the volume phase transition temperature of the PNIPAM-based microgels and could increase the uniformity of microgel particles.The particle size of the microgels thus prepared ranged from 140 nm to 350 nm.  
          
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        发布时间：2021-03-19
      • ZHANG Guobin,FAN Xiaodong,LIU Yuyang,KONG Jie,WANG Shengjie
        Issue 7, Pages: 644-651(2007)
        摘要：UV-curable hyperbranched polysiloxanes were synthesized via hydrolysis of γ-methacryloxyprop-yltrimethyloxysilane (A-174) by controlling the amount of water.Macromolecular structures of the polymers obtained were characterized and confirmed by FT-IR,1H-NMR spectra and multi-angle laser light scattering technology(MALLS).The results indicated that the hyperbranched polysiloxanes carrying a large amount of functional vinyl groups could be cured under UV-irradiation.Their photo-initiated curing kinetics were studied by isothermal differential photo calorimeter (DPC) test.It was found that both the polymerization rate and the ultimate conversion first increased and then decreased with the increase in the molecular weight of the polymer and the photoinitiator concentration.The increase in UV-light intensity can lead to increase of both the polymerization rate and the ultimate conversion,and particularly,the polymerization rate is proportional to the square root of light intensity.Although elevated temperature can indeed improve the polymerization rate and the ultimate conversion,the effect of temperature on polymerization rate is not prominent.The total exponent of the photo-polymerization of the polymer 3# is about 3,and the apparent activation energy is 16.9 kJ/mol,calculated from an autocatalytic model.  
          
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        发布时间：2021-03-19
      • LI Xiaoqin,ZHOU Juan,QIAO Xiaoguang,WU Limin
        Issue 7, Pages: 652-656(2007)
        摘要：The strategy to design and fabricate organic-inorganic nanocomposite microspheres is of burgeoning interest in recent years.Electron staining technique was used to investigate the effect of various staining parameters on the morphology of organic-inorganic nanocomposite microspheres with SiO2/P(St-co-BA) core-shell nanocomposite particles as an example.The results showed that the different staining conditions had an obvious influence on the morphology of organic-inorganic nanocomposite microspheres observed by transmission electron microscope (TEM).It was found that the staining time was around 1 min and the staining agent dosage should be controlled between 0.08%～0.16% to obtain the desired results.Usually,uranium acetate may give better TEM results than phosphtungstic acid.  
          
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        发布时间：2021-03-19
      • XU Ning,DU Fusheng,LI Zichen
        Issue 7, Pages: 657-664(2007)
        摘要：Two kinds of end-functionalized poly(ε-caprolactone)s,maleimido-PCL and HS-PCL,were synthesized by the ring-opening polymerization of ε-caprolactone (ε-CL) with N-hydroxyl ethyl maleimide (HEME) and 2-mercaptoethanol (ME) as initiators,respectively.Polymerizations were catalyzed by tin (Ⅱ) trifluoromethane (Sn(OTf)2) in bulk under mild conditions.These polymers showed low polydispersities and have functional groups at both ends.Two glutathione-terminated poly(ε-caprolactone) (GS-PCL and GSS-PCL) were then synthesized by Michael addition reaction of the maleimido-PCL with glutathione,or the coupling reaction of HS-PCL with glutathione,respectively.The structures of the two amphiphilic polyesters were confirmed by 1H-NMR and GPC measurements.Glutathione groups on the chain end increased the hydrophilicity of PCL,therefore,the polyesters can self-assemble in aqueous buffer solutions.Transmission electron microscopy (TEM) measurements confirmed the formation of spherical aggregates with the diameter range from 20～80 nm,and the size of the aggregates was found to increase with the decease of the pH of the buffer.In addition,aggregates from GSS-PCL showed redox-sensitive properties.  
          
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        发布时间：2021-03-19
      • SHANGGUAN Yonggang,XIE Yanli,ZHENG Qiang
        Issue 7, Pages: 665-671(2007)
        摘要：Effect of composition on crystallization behavior for polypropylene catalloys (PP-cats)was studied by using differential scanning calorimetry (DSC)and polarized optical microscopy (POM).The decrease of melting point for PP-cats indicates the existence of stronger interaction between the propylene homopolymer and the ethylene-propylene random copolymer (EPR)in PP-cats.The isothermal crystallization kinetics of PP-cats in the early stage could be described by the Avrami model,and a comparison with that of pure iPP was carried out.It is found that the crystallization of PP-cats proceeds with instantaneous nucleation and three-dimensional growth.The overall crystallization rate of PP-cats is higher than that of pure iPP and increases with the increase of the EPR content.However,the spherulite growth rate of PP-cats appears slower than that of pure iPP and decrease with the increase of the EPR content,which is ascribed to the difficulty in moving of propylene chains due to the higher viscosity of PP-cats melt.Furthermore,the results of morphology observation reveal that the nucleation density of PP-cats is rather higher than that of pure iPP.It is suggested that the higher overall crystallization rate of PP-cats is a result of the nucleation effect of the EP content.  
          
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        发布时间：2021-03-19

        Research Bulletin

      • ZHAO Jing,WANG Gengchao,LI Xingwei,ZHANG Zhiping
        Issue 7, Pages: 672-675(2007)
        摘要：Poly(N-［5-(8-hydroxyquinoline)methyl］aniline)/Meso-V2O5 (PNQA/Meso-V2O5) hybrid materials were synthesized by intercalative polymerization method.The results show that the interlayer spacing of the Meso-V2O5 has increased from 2.40 nm to 2.81 nm,while the lamellar of V2O5 is preserved.The electrical conductivity of the hybrid materials is by 3 orders of magnitude higher than that of the Meso-V2O5. The photoluminescence analysis indicates that the emission band of the hybrid is blue shifted 22 nm in comparison with that of pure PNQA,and the hybrid gives a quantum yield of 26%,which is higher than that (10%) of PNQA in ethanol.  
          
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        发布时间：2021-03-19
      • HUANG Qiang,LI Zhijiang,MA Xiaolin,LONG Quan,ZHENG Baozhong
        Issue 7, Pages: 676-679(2007)
        摘要：Three formyl group functional cross-linking polystyrene resins of p-formylphenoxymethyl,p-formyl-2-methoxphenoxymethyl,and p-formyl-3-methoxphenoxymethyl were facilely and rapidly synthesized from Merrifield resin under phase transfer catalytic condition coupling with microwave irradiation (MI-PTC) in a domestic microwave oven.Under MI-PTC condition,these resins can be prepared for about only one hour respectively,while more than eight hours was in need under conventional heating.In this study,a mild power input of 158 W was used,and tetrabutylammonium iodide was considered as the best phase transfer catalyst.The process of reaction was monitored by FTIR spectra,and the conversion rates were determined by elemental analysis.This method provides a facile and rapid transformation of functionalized resin in a mild reaction system.  
          
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        发布时间：2021-03-19
      • TANG Minfeng,FAN Xiaodong,SI Qingfa,LIU Xiang,LIU Yuyang
        Issue 7, Pages: 680-684(2007)
        摘要：A hyperbranched polymer terminated by unsaturated double bonds (HBS) was synthesized and applied in emulsion copolymerization of acrylic monomers,butyl acrylate and methyl methacrylate.The polymerization mechanism,properties of the copolymers and the influence of HBS on the crosslinking structure of copolymers were investigated.The results showed that the acrylates emulsion polymerization process in the presence of HBS was stable,and crosslinked latex particles with average diameter less than 100 nm were obtained.FT-IR measurements of the latex copolymers also showed that the unsaturated terminal groups of HBS are all accessible to polymerization without trapping inside the hyperbranched macromolecular structure,and thus,the polymer networks in which HBS act as multi-arms crosslink points come into being.The emulsion polymerization rate and thermal stablity of the latex copolymers increase,the latex particle size decreases with the increase in HBS content.  
          
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        发布时间：2021-03-19
      • ZHOU Qiaoping,WU Jin,ZHANG Jun,HE Jiasong,SUN Zhijie,ZHANG Zuoguang
        Issue 7, Pages: 685-688(2007)
        摘要：High-amylose starch can dissolve effectively in a room temperature ionic liquid 1-allyl-3-methylimidazolium chloride (amimCl). By using amimCl as the reaction medium,high-amylose starch acetates with a relatively wide range of degree of substitution (DS) were homogeneously synthesized by a one-step method in the absence of any catalyst.The effects of reaction time and acetic anhydride/anhydroglucose unit (AGU) molar ratio on the DS of starch acetates were investigated.These starch acetates exhibited different solubility in water,acetone and DMAc,depending on the DS value.Finally,the fibrous membranes composing of continuous and smooth fibers with diameters in a range from several tens to several hundreds nanometers were successfully produced via electrospinning of starch acetate solution.  
          
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        发布时间：2021-03-19
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