Ceric Ion Initiated Graft Polymerization onto Poly(vinyl Alcohol) |
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| Authors: | George Odian Jose H T Kho |
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| Institution: | 1. Division of Science and Engineering , Richmond College City University of New York , Staten Island, New York, 10301;2. Department of Lihemical Engineering , Columbia University , New York, New York;3. Eastman Chemical Industries, Inc. , Quezon City, Phlippines |
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| Abstract: | This paper describes the kinetics of the ceric ion-initiated graft co-polymerization of vinyl acetate-acrylonitrile to poly(vinyl alcohol). The graft copolymerization rate Rp was found to be first order with respect to the total concentration of the comonomer mixture M], the concentration of vinyl alcohol repeating units PVA], and the mole fraction of vinyl acetate in the comonomer feed mixture. Rp was independent of cerous ion. The grafting rate was independent of ceric ion above a ceric concentration of 0.0020 M but first order in ceric ion below that concentration. Rp initially increased rapidly with H+] to a maximum and then decreased and levelled off at hgher H+]. The rate of ceric ion disappearance was first order in PVA], independent of MI, and increased with increasing H+] with a leveling off at high H+]. A reaction mechanism. |
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