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KMID : 1024520100190091161
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Journal of the Environmental Sciences
2010 Volume.19 No. 9 p.1161 ~ p.1167
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Control of Enzymatic Degradability of Biodegradable Polylactide by Blending with Non-degradable Polymers
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Jang Seong-Ho
Park Sang-Bo
Lee Won-Ki
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Abstract
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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.
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KEYWORD
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Poly, 1-Lactide, Enzymatic degradation, Blend, Surface enrichment, Retardent
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