Abstract
Polylactide (PLA) with % L repeat unit contents of 100 (PLA-100), 99, 96, 94, 92, 85, 80, 75, 70, 50, and 0 were prepared and films of these samples were prepared by solution casting and then annealing at 75°C for 36 h to crystallize. Large changes in the crystalline order for PLA with % L compositions between BS and 100% were observed by DSC and WAXS measurements. The PLA films were incubated with proteinase K (from Tritrachium album) to determine enzyme-catalyzed rates of both film weight loss and initial surface degradation. Proteinase K preferentially degraded (L)-PLZA as opposed to (D)-PLA. Optimal rates for both film weight loss and initial surface degradation were found for PLA-92
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