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Du Z.,Shanghai Key Laboratory of Advanced Polymeric Materials | Zhang Y.,Shanghai Key Laboratory of Advanced Polymeric Materials | Lang M.,Shanghai Key Laboratory of Advanced Polymeric Materials | Lang M.,Anhui Collaborative Innovation Center for Petrochemical New Materials
Journal of Materials Science: Materials in Medicine | Year: 2015

This study focuses on the synthesis of Pluronic-b-poly(ε-caprolactone) bearing benzyl-oxycarbonylmethyl and carboxylic groups and the comparative study to investigate the influence of the different pendant groups on the cellular behavior. The functionalized Pluronic-b-poly(ε-caprolactone) bearing two kinds of pendant groups are synthesized via ring-opening polymerization of ε-caprolactone and 6-(benzyl-oxycarbonyl methyl)-ε-caprolactone and followed by deprotection respectively. The structure of the copolymers is confirmed and the polymeric micelles are formed by an emulsion/solvent evaporation technique. The critical micelle concentrations are improved compared with Pluronic F127, the morphologies of the micelles are spherical with the diameter on nano scale and good colloidal stability. The copolymers have good cytocompatibility and the comparative study reveals that cellular internalization, digesting by lysosome and intracellular distribution are affected by the pendant groups, moreover, the endocytosis pathway is determined by the pendant groups. Therefore, the definite internalization mechanism is beneficial for the design of polymeric micellar carriers to achieve intra- or extracellular modes of drug delivery and provide better access to either cell membrane or intracellular organelles. © 2015, Springer Science+Business Media New York. Source


Si P.,Shanghai Key Laboratory of Advanced Polymeric Materials | Wang J.,Shanghai Key Laboratory of Advanced Polymeric Materials | Zhao C.,Shanghai Key Laboratory of Advanced Polymeric Materials | Xu H.,Anhui Collaborative Innovation Center for Petrochemical New Materials | And 2 more authors.
Polymers for Advanced Technologies | Year: 2015

This study described an approach to impart controlled morphology and improved pore interconnectivity to poly(dimethylsiloxane) (PDMS) sponges for oil sorption by partially fusing the sugar particles together prior to creation of a continuous PDMS matrix. PDMS sponges with high absorption capacity, low water pickup, and remarkable reusability were fabricated by the polymerization of the PDMS prepolymer and a curing agent in cyclohexane. The PDMS sponge showed oil absorbency in the range from 790% to 4000% for various oils solvents, with the maximum absorption capacity reaching up to 23 times of its weight. Compressive modulus of PDMS subjected to sugar fusion for 24hr was significantly increased to 1900Mpa. The sponge also exhibited excellent repellency to corrosive strong acid and alkali. Besides, oil can be quickly adsorbed in tens of seconds and maintained for several months. Furthermore, PDMS sponges showed little loss of their absorption capacities and owned weights after 20 absorbing/recovering cycles. © 2015 John Wiley & Sons, Ltd. Source


Qian J.,East China University of Science and Technology | Qian J.,Sino Polymer Co. | Liu Z.,East China University of Science and Technology | Liu Z.,Sino Polymer Co. | And 5 more authors.
Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities | Year: 2015

Tetraglycidyl 4,4'-diaminodiphenylmethane (TGDDM) was toughened by reactive blending and physical blending respectively with multifunctional vinyl ester resin (MVER). Novel multifunctional hybrid oligomer (MVEO-2) containing two different reactive groups was synthesized through the esterfication of TGDDM with acrylic acid (AA)[n(TGDDM)/n(AA)=1∶ 2] while MVEOmix was obtained by physical blending TGDDM with MVER. The structures and properties of MVEO-2 and MVEOmix were studied. FTIR and 1H NMR show that two oligomers have same structural components. It was found that MVEOmix presented bimodal and narrow molecular weight distribution while MVEO-2 had multimodal and broad molecular weight distribution. MVEO-2 showed obvious improvement in thermal stability than MVEOmix from thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA) analysis. The strength and toughness of MVEO-2 were improved than those of MVEOmix: flexural strength improved 17%, tensile strength improved 38%, elongation improved 35% and impact strength improved 24%. The excellent performance of MVEO-2 was attributed to the formation of close and even interpenetrating polymer network (IPN), which was demonstrated by scanning electron microscope (SEM). ©, 2015, Higher Education Press. All right reserved. Source


Qian J.,East China University of Science and Technology | Qian J.,Sino Polymer Co. | Liu Z.,East China University of Science and Technology | Liu Z.,Sino Polymer Co. | And 5 more authors.
Journal of Applied Polymer Science | Year: 2015

Novel multifunctional hybrid vinylized epoxide oligomers (MVEOs) containing two different reactive groups were synthesized through the esterification of tetraglycidyl 4,4′-diaminodiphenylmethane (TGDDM) with acrylic acid (AA) at various molar ratios. The changes of vinyl ester and epoxy groups in MVEOs were studied by Fourier Transform Infrared Spectroscopy, Nuclear Magnetic Resonance, and Gel permeation chromatograph. It was found that more amount of AA in the reactant would increase the contents of vinyl ester and molecular weight. The curing behavior of MVEOs has been studied by scanning differential scanning calorimetry (DSC). Two distinct exothermic peaks were observed in the MVEOs which can be attributed to the radical polymerization of vinyl ester/styrene and condensation polymerization of epoxy/MeTHPA, respectively. Two different kinds of curing programs have influenced each other which makes the exothermic peaks overlapped. The DSC scan of MVEO-2 indicated that the radical initiated curing reaction of vinyl ester won't notably affect the curing of epoxy without MeTHPA. However, the thermal curing of vinyl ester in MVEO-2 without MEKP/Co would be occurred with the temperature rising. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 42276. © 2015 Wiley Periodicals, Inc. Source


Zhang G.-X.,East China University of Science and Technology | Cui Z.-W.,East China University of Science and Technology | Ren J.-W.,East China University of Science and Technology | Liu T.,East China University of Science and Technology | And 2 more authors.
Huadong Ligong Daxue Xuebao/Journal of East China University of Science and Technology | Year: 2016

With supercritical CO2 as foaming agent, polypropylene/wood flour composites were foamed by quick decreasing pressure method and the cell morphology was observed by transmission electron microscopy. By controlling the variable factors, the effects of foaming temperature, saturation pressure, decreasing pressure rate and the content of wood flour on cell morphology of foaming system were analyzed considering supercritical CO2 dissolution, the cell nucleation and growth. Cell density and pore size were obtained by scanning electron microscopy, and their changing rule and mechanism were investigated by considering the influence of different test conditions for supercritical CO2 foaming PP/wood powder system. © 2016, East China University of Science and Technology. All right reserved. Source

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