The purity of LLA, effect of catalyst, temperature and time on reaction were researched.The results indicate that use the best reaction condition can be obtained PLLA at 500000 molecular mass.

• 通过对单体纯度、催化剂用量、聚合温度、聚合时间等影响因素的考察，得出了合成粘均分子量可达到50万的PLLA的最佳条件。