The effects of addition of non degradable polymers, polystyrene (PS) and poly(methyl methacrylate) (PMMA) on the rate of enzymatic degradation of biodegradable poly(l-lactide) (PLLA) have been studied in term of surface structure. Since a component in multicomponent polymeric system has shown surface enrichment, PS and PMMA which have lower surface energy than PLLA were selected as a minor blend component (5 wt%). Enzymatic degradation was carried out at 37 ºC and pH 8.5 in the aqueous solution of Proteinase K. Two blend systems, partially miscible (PS/PLLA) and immiscible (PMMA/PLLA), showed the surface enrichment of 4 and 2 times of PS and PMMA, respectively. From the weight loss profile data, the slow degradation rate of both blend films was observed. This indicates that PS or PMMA domains which exist at surface act as a retardant of enzymatic attack.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1. 재료
  2.2. 표면분석
  2.3. 효소 분해성의 평가
 3. 결과 및 고찰
  3.1. 블렌드 필름의 표면구조
  3.2. 블렌드 필름의 효소분해특성
 4. 결 론
 참 고 문 헌

• 장성호(부산대학교 지역환경시스템전공) | Seong-Ho Jang (Department of Environmental System Engineering, Pusan National University)
• 박상보(부경대학교 고분자공학과) | Sang-bo Park (Department of Polymer Engineering, Pukyong National University)
• 이원기(부경대학교 고분자공학과) | Won-Ki Lee (Department of Polymer Engineering, Pukyong National University) Corresponding Author