POLY(LACTIC ACID)-BASED MATERIALS BY METHOD UTILIZING MELT STRETCHING AND COLD CRYSTALLIZATION

摘要

A process for producing poly(lactic acid)-based material includes a melt stretching step including melt stretching amorphous poly(lactic acid) resin at a melt stretch temperature T_ms, wherein the amorphous poly(lactic acid) resin is capable of crystallization, and wherein the T_ms is greater than the glass transition temperature T_g of the amorphous poly(lactic acid) resin and less than the crystallization temperature T_c of the amorphous poly(lactic acid) resin, thus providing a melt stretched poly(lactic acid); and a crystallization step including providing the melt stretched poly(lactic acid) at a cold crystallization temperature T_cc of greater than the glass transition temperature T_g of the amorphous poly(lactic acid) resin and less than the crystallization temperature T_c of the amorphous poly(lactic acid) resin, and wherein the melt stretched poly(lactic acid) is maintained at the cold crystallization temperature T_cc for a sufficient time t_cc to allow for cold crystallization.