화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korea Polymer Journal, Vol.7, No.2, 93-101, April, 1999
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Biodegradable Polymer Blends of Poly(lactic acid) and Starch
Jun Wuk Park, Deuk Jin Lee, Eui Sang Yoo, Seung Soon Im†, Soo Hyun Kim1, and Young Ha Kim1
  • Department of Textile Engineering, College of Engineering, Hanyang University, 17 haengdang-dong, Seongdong-gu, Seoul, 133-791, Korea
  • 1Biomaterials Research Center, Korea Institute of Science and Technology, P.O.Box 131, Cheongryang, Seoul 130-650, Korea
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Poly(lactic acid)(PLA) and starch were melt-blended using a twin screw mixer. To improve the toughness of blends, poly(ε-caprolactone)(PCL) was added up to 30wt%. Blends were characterized by DSC thermal analysis, tensile test, morphological analysis and ATR IR spectroscopic analysis. The addition of starch gave little influence on thermal properties. In particular, at the starch content of 5 wt%, the crystallinity of PLA were the highest. The addition of starch resulted in reducing the tensile strength and elongation ratios, PCL was found to be effective in improving toughness. ATR IR spectra showed that the C=O band of PLA shifted when starch was added, indicating that some hydrogen bonding formed between the ester group of PLA and the hydroxyl group of starch. Morphological results by polarized optical microscopy showed that the size of the spherulite became smaller and less regular as the content of starch increased
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