Graft polymerization of vinyl acetate onto granular starch: Comparison on the potassium persulfate and ceric ammonium nitrate initiated system

doi:10.1002/app.24672

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Title:	Graft polymerization of vinyl acetate onto granular starch: Comparison on the potassium persulfate and ceric ammonium nitrate initiated system
Authors:	Lai, S. M.;董崇民;Don, Trong-ming;Liu, Y. H.;Chiu, Wen-yen
Contributors:	淡江大學化學工程與材料工程學系
Date:	2006-11-01
Issue Date:	2010-03-09 09:54:17 (UTC+8)
Publisher:	Wiley-Blackwell
Abstract:	This work was undertaken to discuss in depth the vital differences in the morphological development during synthesis, and properties of starch-g-poly-(vinyl acetate) copolymers using two different initiators, potassium persulfate (KPS) and ceric ammonium nitrate (CAN). KPS-initiated system gave relatively low values of grafting ratio and grafting efficiency, indicating a great tendency for the formation of poly(vinyl acetate) homopolymer (PVAc). Yet, higher values were seen for the CAN-initiated system. Transmission electron microscope observations indicated a relatively broad distribution of latex particles for the KPS-initiated system. The surface potential of latex particles was about −3.5 mV, which turned out to be insufficient to maintain stability of latex particles. On the other hand, a uniform particle size distribution was found for the CAN-initiated system, as the surface potential of latex particles was 21.5 mV. Moreover, radicals on starch molecules were generated directly through a redox reaction with positively charged ceric ion. The hydrophobic PVAc chains were thus grafted on starch, resulting in an amphiphilic graft copolymer, which provides a sufficient stabilization degree as a role of surfactant to render a relatively uniform distribution of latex particles. The synthesized starch-g-poly(vinyl acetate) copolymers were further converted to starch-g-poly(vinyl alcohol) through saponification, which were subjected to evaluations regarding the biodegradation and cell culture capability. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 3017–3027, 2006
Relation:	Journal of Applied Polymer Science 102(3), pp.3017-3027
DOI:	10.1002/app.24672
Appears in Collections:	[Graduate Institute & Department of Chemical and Materials Engineering] Journal Article

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