Abstract
Abstract 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.Key Words :Poly(l-lactide), Enzymatic degradation, Blend, Surface enrichment, Retardent 1. 서 론 1) 석유화학 및 고분자화학의 발전에 따라 기존의 나무, 철강 등의 천연소재의 대용품으로 합성 플라스틱이 개발되어, 저렴한 가격, 낮은 비중, 뛰어난 성형성 등으로 다양한 분야에서 사용되고 있으며 2010년의 플라스틱의 세계 생산량이 3억톤에 달할 것으로 예상
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