writer：王偉超，吳林波*，黃源，李伯耿
keywords：可生物降解高分子，聚乳酸(PLLA)，熔融縮聚
source：期刊
specific source：材料科學(xué)與工程學(xué)報 23卷專輯: 11-14, 2005.12
Issue time：2005年
Modified melt polycondensaton of L-lactic acid (LLA) was conducted with a binary SnCl2·2H2O/TSA catalyst system to synthesize high molecular weight poly(L-lactic acid) (PLLA). The effect of the catalyst amount, reaction temperature and
time on the molecular weight and yield of PLLA had been investigated. PLLA with weight-average molecular weight of about 100 000 was successfully synthesized at a yield of 70% via melt polycondensation with 0.4wt% catalysts at 180 oC and under 300Pa for 25 hours. The microstructure, aggregation state and thermal properties of PLLA had been characterized by FT-IR, 1H NMR and DSC, respectively. The resulting PLLAs possess high crystallinity and melt temperature, white to pale yellow color, good film-forming and fiber-forming properties.