Synthesis, characterization, and properties of poly(vinyl acetate)- and poly(vinyl alcohol)-grafted chitosan

被引：0
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作者：
Radhakumary, C. [1 ]
Nair, Prabha D. [1 ]
Mathew, Suresh [2 ]
Reghunadhan Nair, C.P. [3 ]
机构：
[1] Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram 695012, India
[2] School of Chemical Sciences, M.G. University, Kottayam 686560, India
[3] PSC Division, VSSC, Thiruvananthapuram 695022, India
来源：
Journal of Applied Polymer Science | 2007年 / 104卷 / 03期
关键词：
Graft copolymers of chitosan and vinyl acetate were synthesized by free radical technique using cerium (IV) as the initiator. Under controlled conditions; as much as 92% grafting with a grafting yield of 30-40% could be achieved. Chitosan-g-poly(vinyl alcohol) copolymers were derived by the alkaline hydrolysis of the chitosan-g-poly(vinyl acetate) precursor. Thermogravimetric; FTIR; and X-ray diffraction analyses of chitosan and the copolymers confirmed the grafting reaction between chitosan and vinyl acetate and also the subsequent hydrolysis. Both the copolymers possessed very good film-forming properties. Grafting resulted in a significant increase in mechanical strength of both the copolymers in the dry condition. Chitosan-g-poly (vinyl acetate) (CH-PVAc) proved more hydrophobic than did pure chitosan; whereas chitosan-g-poly(vinyl alcohol) (CH-PVOH) exhibited enhanced hydrophilicity as evident from their swelling characteristics and contact angle measurements. The enhanced swelling of CH-PVOH was ascribed to the presence of the pendant poly(vinyl alcohol) group. At pH 1.98; the CH-PVAc copolymer films showed greater stability than do pure chitosan films; which is highly beneficial for specific biomedical applications. Both the copolymers showed lower glass transition temperature than do pure chitosan. Grafting did not affect the overall thermal stability; and the differential thermogram substantiated the grafting. The investigations indicate that the synthetic-natural hybrid copolymers having desirable mechanical properties and tailored hydrophilic/hydrophobic characteristics are realizable. These polymers could be exploited for varied biomedical applications. © 2007 Wiley Periodicals; Inc;
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页码：1852 / 1859
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