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ELECTROSPRAYING/ELECTROSPINNING OF POLY(γ-STEARYL-LGLUTAMATE):FORMATION OF SURFACES WITH SUPERHYDROPHOBICITY

Chinese Journal of Polymer Science 2009年第1期27卷 115-120页

作者：吴健徐志康 Department of Chemistry Zhejiang University Institute of Polymer Science and Key Laboratory of Macromolecular Synthesis and Functionalization (Ministry of Education)Zhejiang University

Electrospraying/electrospinning of poly(γ-stearyl-L-glutamate) (PSLG) was investigated on a series solutions with different concentrations in *** emission scanning electron microscopy (FESEM) and attenuated Iotal reflectance Fourier transform infrared spectroscopy (FT-IR/ATR) were used to characterize the morphology and structure of the electrosprayed/electrospun polypeptide *** was found that electrospraying of PSLG with concentrations lower than 16 wt% afforded beads,while microfibers cou...

关键词： Electrospinning/electrospraying Poly（γ-stearyl-L-glutamate） Polypeptide Water contact angle Superhydrophobic surface

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synthesis,structure and catalytic activity of complexes [Ln(EDBP)_2(DME)Na(DME)_3](Ln=Er,Yb,Sm) for ring-opening polymerization of ε-caprolactone

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Science China Chemistry 2009年第10期52卷 1711-1714页

作者： YU JianFang, WU GuangMing, HUANG Jing, SUN WeiLin & SHEN ZhiQuan key laboratory of macromolecular synthesis and functionalization, Ministry of Education, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China 1. Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of Education Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China

Discrete ion-pair complexes [Ln(EDBP)2(DME)Na(DME)3] [Ln=Er (1), Yb (2), Sm (3)] have been synthesized by the reaction between sodium salt of 2,2'-ethylidene-bis(4,6-di-tert-butylphenol)(EDBPH2) and Ln(BH4)3·3THF (Ln=Er, Yb, Sm) followed by centrifugation and recrystalization. The complexes were characterized by elemental analysis and FT-IR, and the bonding model of these compounds was confirmed by X-ray single crystal diffraction for complex 1. It was found that four O atoms in two biphenol ligands as well as two O atoms in one ethylene glycol dimethyl ether (DME) molecule connect to the center rare earth metal atom, while sodium exists as counterpart cation to balance the charge. Complexes 1―3 can all be used as single component initiators for the ring-opening polymerization of ε-caprolactone.

关键词： ring-opening polymerization ε-caprolactone X-ray single crystal biphenol

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Large enhancements in gelation behavior of wheat gliadins by incorporation of low concentrations of methylcellulose

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Chinese Chemical Letters 2009年第5期20卷 623-626页

作者： Yi Hu Song Ling Fang Li Qiang Zheng Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China Key Laboratory of Macromolecular Synthesis and Functionalization of Ministry of Education Zhejiang University Hangzhou 310027 China

Influence of non-gelling methylcellulose （MC） on gelation behavior of wheat gliadins in 13 wt% alkaline propanol/water （50：50, v/v） solution was investigated using dynamic theological time sweep test. Increasing MC concentration （CMC） up to CMC = 1 wt% caused a significant reduction in gelation time （tget） of the solution and an increase in loss tangent （tan δ） value of the resultant gel at T 〈 30 ℃.

关键词： Gliadin Gelation Rheology Methylcellulose （MC）

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Preparation and properties of wheat gluten/silica composites

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Science China Chemistry 2009年第3期52卷 257-260页

作者： SONG YiHu ZHENG Qiang ZHOU WenCe Department of Polymer Science and Engineering Zhejiang UniversityHangzhou 310027China Key Laboratory of Macromolecular Synthesis and Functionalization of Ministry of Education Zhejiang UniversityHangzhou 310027China

Wheat gluten (WG)/silica (SiO2) hybrids were prepared through in-situ synthesis of SiO2 in WG disper-sion of aqueous ammonia. The hybrids with different SiO2 contents were mixed with glycerol plasticizer to form cohesive dough and the dough was compressively molded to form cross-linked sheets. Morphology, moisture absorption, protein solubility in water, tensile mechanical properties and dynamic rheological behavior of the WG/SiO2 composites were investigated in relation to SiO2 contents.

关键词： wheat gluten silica composites properties

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Surface modification of acrylate intraocular lenses with dielectric barrier discharge plasma at atmospheric pressure

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Science China Chemistry 2009年第8期52卷 1235-1243页

作者： WANG Yao LIU ZhenMei XU ZhiKang YAO Ke Institute of Ophthalmology and Eye Center Affiliated Second HospitalCollege of MedicineZhejiang UniversityHangzhou 310009China Key Laboratory of Macromolecular Synthesis and Functionalization of Ministry of Education Institute of Polymer ScienceZhejiang UniversityHangzhou 310027China

Surface modification with dielectric barrier discharge(DBD) plasma was carried out at atmospheric pressure(argon as the discharge gas) to improve the biocompatibility of hydrophobic acrylate intraocular lens(IOL).Changes of the plasma-treated IOL surface in chemical composition,morphology and hydrophilicity were comprehensively evaluated by X-ray photoelectron spectroscopy(XPS),field emission scanning electron microscopy(FESEM),atomic force microscopy(AFM) and water contact angle(WCA) *** surface biocompatibility of the untreated and plasma-treated IOLs was compared with the adhesion behavior of platelets,macrophages and lens epithelial cells(LECs) in *** DBD plasma treatment,the hydrophilicity of the IOL surface was obviously *** changes in WCA with treatment extension may be attributed to both the introduction of oxygen or/and nitrogen-containing polar groups and the increase of surface roughness induced by plasma etching *** existence of low molecular weight oxidized material(LMWOM) was proved on the plasma-treated IOL which was caused by the chain scission effect of the plasma *** plasma-treated IOLs resisted the adhesion of platelets and macrophages *** LECs spreading and proliferation were postponed on the IOLs plasma-treated for more than 180 s,with a well maintained epithelial phenotype of *** IOL biocompatibility was improved after the DBD plasma *** speculate that slighter foreign-body reaction and later incidence of anterior capsule opacification(ACO) may be expected after implantation of the argon DBD plasma-treated IOL.

关键词： hydrophobic acrylate intraocular lens surface modification dielectric barrier discharge plasma at atmospheric pressure biocompatibility surface property

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synthesis OF A HYPERBRANCHED POLY(AROYLARYLENE) CONTAINING TRIAZOLE AND FLUORENE FUNCTIONALITIES BY CLICK CHEMISTRY AND METAL-FREE,REGIOSELECTIVE POLYCYCLOTRIMERIZATION

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Chinese Journal of Polymer Science 2009年第2期27卷 145-148页

作者： Cathy K.W.Jim Jacky W.Y.Lam 唐本忠 Department of Chemistry The Hong Kong University of Science & TechnologyClear Water BayKowloonHong KongChina Department of Polymer Science and Engineering Key Laboratory of Macromolecular Synthesis and Functionalization of Ministry of EducationZhejiang University

A new bis(aroylacetylene) containing tfiazole and fluorene moieties is synthesized by click chemistry. Polycyclotrimerization of the monomer is catalyzed by piperidine in refluxed dioxane,furnishing a regioregular poly(aroylarylene) in a satisfactory *** hyperbranched structure of the polymer is characterized spectroscopically with satisfactory *** polymer enjoys no metal detriment and is soluble in common organic solvents such as tetrahydrofuran (THF),chloroform,dichloromethane (DCM),and N,N-...

关键词： Regioregular Click chemistry Polycyclotrimerization Hyperbranched polymer.

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STUDIES ON RELATION BETWEEN INTRINSIC VISCOSITY OF POLYELECTROLYTES IN SOLUTIONS USED FOR LAYER-BY-LAYER SELFASSEMBLY AND THEIR CORRESPONDING ADSORPTION AMOUNTS IN THE RESULTANT MULTILAYER MEMBRANES

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Chinese Journal of Polymer Science 2009年第3期27卷 297-306页

作者：钱锦文安全福 Phillip Choi Department of Polymer Science & Engineering Key Laboratory of Macromolecular Synthesis and Functionalization(Ministry of Education)Zhejiang University Department of Chemical and Materials Engineering University of AlbertaEdmontonAlbertaCanada T6G 2G6

The adsorption amount of poly(styrene sulfonate) and poly(dimethyldiallyl ammonium chloride) (PSS/PDDA) self-assembled multilayer membranes in designed dipping solvents were measured by UV-Vis-spectroscopy and quartz crystal microbalance (QCM). Intrinsic viscosities of PSS and PDDA in corresponding dipping solvents were determined by an Ubbelohde viscometer. It is found that the adsorption amount of PSS/PDDA self-assembled multilayer membranes built up in different dipping solutions, added salt concentration, pH of solution and solvent quality, respectively changed oppositely with the corresponding intrinsic viscosity of PSS and PDDA in dipping solvents. A negative relation between the adsorption amount and intrinsic viscosity was revealed, and explained in term of the concept of excluded volume of polymer molecule in dilute solutions.

关键词： Self-assembled multilayer membrane PSS/PDDA Polyelectrolyte solution Intrinsic viscosity

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Fabrication and properties of injectable β-tricalcium phosphate particles/fibrin gel composite scaffolds for bone tissue engineering

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Materials Science and Engineering C 2009年第3期29卷 836-842页

作者： Zhao, Haiguang Ma, Lie Gao, Changyou Wang, Jinfu Shen, Jiacong Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of Education Zhejiang University Hangzhou 310027 China Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China Institute of Cell Biology College of Life Science Zhejiang University Hangzhou 310058 China

β-Tricalcium phosphate (β-TCP) particles with a size of ~ 200nm were blended with fibrinogen and thrombin to obtain an injectable composite scaffold. Clotting time of the composite systems was compared with the fibrin gel control. Results show that incorporation of the β-TCP particles could pronouncedly prolong the clotting time, and endow the resulted scaffold with a denser microstructure. The β-TCP particles were evenly distributed in the fibrin gel, with an increased particle size in a scaffold of a larger amount of the particles. Elastic modulus of the scaffold was increased with the increase of β-TCP particles' content too. In vitro human mesenchymal stem cell culture showed that both cytoviability and cell number were increased along with increase of the β-TCP particle amount. At a 1.5% β-TCP particle, the highest activity of alkaline phosphatase was measured. Since the fibrin gel itself is already very biocompatible, compounding with the β-TCP particles may enable the resulted scaffold more suitable for bone regeneration, with the preserved merit of potential injection in situ. © 2008 Elsevier B.V. All rights reserved.

关键词： Biocompatibility

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Cholesterol tethered bioresponsive polycation as a candidate for gene delivery

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Materials Science and Engineering C 2009年第3期29卷 1066-1070页

作者： Zhu, Ying Wang, Youxiang Hu, Qiaoling Shen, Jiacong Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of Education Zhejiang University Hangzhou 310027 China Second Affiliated Hospital Medical College Zhejiang University Hangzhou 310009 China

The efficient unpacking of viral protein shell gave the inspiration for the synthesized vectors. In this research, novel cholesterol tethered bioresponsive polyethylenimine (PEI) was specially designed via disulfide-containing cross-linker. The cholesterol lipid had proved to increase the permeability of gene vector through cell membrane. The acid-base titration indicated that the synthesized polycation possessed efficient proton sponge effect, which was suggested to increase endosomal release of pDNA complexes into the cytoplasm. The cholesterol tethered polycation could effectively induce DNA condensation and form spherical particles with diameter about 200nm at N/P ratio of 10. At glutathione concentration of 3mM, the polyplexes were unpacked due to the bioresponsive cleavage of the disulfide bonds. The in-vitro experiment indicated that the polyplexes showed efficient transfection efficiency to HEK293T cells. All the results indicated that the bioresponsive polycation could be served as an effective trigger to control the release of DNA at the intracellular environment. The novel bioresponsive polycation might have great potential in non-viral gene delivery research and application. © 2008 Elsevier B.V. All rights reserved.

关键词： Cholesterol

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Crystallization kinetics and morphology of iso-PP/ethylene-propylene-b- copolymer/ ethylene-propylene-r-copolymer ternary blends

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Iranian Polymer Journal (English Edition) 2009年第5期18卷 373-382页

作者： Cao, Min Xu, Jun-Ting Dong, Qi Fu, Zhi-Sheng Fan, Zhi-Qiang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou-310027 China State Key Laboratory of Chemical Engineering Department of Chemical and Biological Engineering Zhejiang University Hangzhou-310027 China

In the present work, ethylene-propylene block copolymer (EP90) and ethylene-propylene random copolymer (EPR) were separated from a PP/EPR in-reactor alloy. The EP90 and EPR were then blended with neat isotactic polypropylene (PP) at various proportions to obtain ternary blends. The isothermal crystallization kinetics and morphology of the ternary blends were studied and were compared with those of PP/EP90 binary blend. It is observed that the Avrami exponent increases with crystallization temperature for all the blends, but the PP/EP90/EPR ternary blends compared to the PP/EP90 binary blend exhibit larger Avrami exponents. The crystallization rate decreases as the crystallization temperature increases, as it is indicated by the increase of crystallization half-time. At the same crystallization temperature, the PP/EP90 binary blend exhibits the slowest crystallization rate. The data of crystallization kinetics were also analyzed with Hoffman-Lauritzen crystallization regime theory. It is found that all the blends crystallize in regime III. The increase in the content of EPR in the ternary blends is followed by increases in secondary nucleation constant, the free energy of the chain folding surface, and the chain folding work. The blends were etched with xylene at room temperature and at 80C to remove EPR and EP90, respectively, and their morphology was studied with scanning electronic microscopy (SEM). The SEM results reveal that the block component EP90 is partially miscible with both PP and EPR, leading to increase in both domain number and domain size. Since both EPR and EP90 retard crystallization of PP in the PP/EPR and PP/EP90 binary blends, we speculate that the miscibility of EPR and EP90 can weaken the interference of EP90 on crystallization of neat PP.

关键词： Polypropylenes

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