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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/44191

    Title: The Synthesis of Chitin-g-Poly(vinyl acetate) Copolymers with a Redox Initiator
    Authors: Don, Trong-ming;Chen, Yun-ru;Chiu, Wen-yen
    Contributors: 淡江大學化學工程與材料工程學系
    Keywords: cerium ammonium nitrate;chitin;graft copolymer;vinyl acetate
    Date: 2002-12
    Issue Date: 2010-03-09 10:01:42 (UTC+8)
    Publisher: Springer Netherlands
    Abstract: Vinyl acetate monomer was graft polymerized onto chitin with a redox initiator, cerium ammonium nitrate. Both the graft copolymerization and emulsion polymerization of pure poly(vinyl acetate) (PVAc) were observed during the reaction and a stable dispersion solution was obtained after the reaction. After the PVAc homopolymer was removed by acetone extraction, the grafting efficiency and grafting percentage were calculated from the weight balance. Transmission and scanning electronic microscope were used to observe the morphologies of the reaction product. Experimental results indicated that at initial stage of reaction, graft copolymerization, which occurred on the surface of chitin particles, dominated over the emulsion polymerization. After that, the rate of emulsion polymerization increased greatly and became dominant. The existence of chitin not only provided the stability of the emulsion particles, but also increased the polymerization rate. Structures of copolymers were evidenced with the techniques of Fourier transform infrared and differential scanning calorimeter.
    Relation: Journal of polymer research 9(4), pp.257-263
    DOI: 10.1023/A:1021312020224
    Appears in Collections:[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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