Starch‐graft‐(synthetic copolymer) latexes initiated with Ce4+ and stabilized by amylopectin |
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| Authors: | Hank De Bruyn Ewan Sprong Marianne Gaborieau John A Roper III Robert G Gilbert |
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| Institution: | 1. Key Centre for Polymer Colloids‐F11, University of Sydney, Sydney, New South Wales 2006, Australia;2. CNFAS/LCAFS, University of Queensland, Brisbane, Queensland 4072, Australia;3. The Dow Chemical Company, Midland, Michigan 49674;4. CNFAS/LCAFS, University of Queensland, Brisbane, Queensland 4072, AustraliaCNFAS/LCAFS, University of Queensland, Brisbane, Queensland 4072, Australia |
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| Abstract: | A method is presented for synthesizing surfactant‐free latexes comprising starch‐graft‐(vinyl polymer) starting with a suspension of amylopectin, either native or modified, then using cerium(IV) with either potassium persulfate or glucose to create grafting sites on the starch. Latex particles comprising polystyrene, poly(styrene‐co‐(n‐butyl acrylate)) and poly(vinyl acetate) grafted onto high molecular weight amylopectin were developed, with up to 80% of the starch effectively grafted to the particles. These latexes were colloidally stable against electrolyte (several months in 4 M NaCl). Reaction rates of Ce4+ with simple sugars and polysaccharides were investigated, as well as the gelation mechanism of the latex. © 2007 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 45: 4185–4192, 2007 |
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| Keywords: | biomaterials colloids dispersions emulsion polymerization graft copolymers polysaccharides radical polymerization |
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