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Preparation of Surface-anionized Poly(vinyl alcohol-co-methacrylic acid) Hydrogel Beads  

윤주표 (성균관대학교 유기소재공학과)
박연흠 (성균관대학교 유기소재공학과)
이세근 (서울대학교 재료공학부)
박기홍 (한국과학기술연구원 정보재료소자연구센터)
이철주 (한국과학기술연구원 정보재료소자연구센터)
Publication Information
Polymer(Korea) / v.27, no.2, 2003 , pp. 159-166 More about this Journal
Abstract
For the purpose of obtaining surface-anionized poly(vinyl alcohol) (PVA) hydrogel beads, vinyl acetate(VAc) and methacrylic acid(MMA) were copolymerized by the suspension polymerization technique and followed by the saponification. It was confirmed by $^1$H-NMR that the copolymerized microspheres contained carboxylic acid groups in their surface. poly(VAc-co-MAA) microspheres were completely saponified in the heterogeneous system. The saponification reaction was laster than that of PVAc microspheres. We observed the swelling property of saponified PVA microspheres treated in the acidic solution and in the alkaline solution successively. Saponified microspheres shrank in acidic solution and swelled in alkaline solution respectively, which was reversible. from the result, saponified microspheres were highly water-absorbing hydrogel beads and were certified -COOH group at their surface by $^1$H-NMR and FT-IR.
Keywords
poly(vinyl alcohol); poly(methacrylic acid); microspheres; saponification; hydrogel;
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