中文摘要：

以辛酸亚锡为催化剂低温常压下引发左旋丙交酯（LLA）开环聚合，快速高效地合成了性能良好的高分子量左旋聚乳酸（PLLA）。通过正交实验研究了催化剂用量、反应温度和时间对产物分子量的影响，在催化剂用量0．21％（质量分数），反应温度100℃，反应时间60min时得到产物粘均分子量高迭16．21×10^4。通过红外光谱（FTIR）、核磁共振氢谱（^1HNMR）对产物的结构进行分析，结果证明利用微波能有效地合成左旋聚乳酸，通过差式扫描量热（DSC）、X衍射（XRD）、旋光度和力学性能对左旋聚乳酸膜的性能进行表征，结果显示产物纯净，其结晶度为85．6％，光学纯度为98％，有良好的力学性能。

英文摘要：

High molecular weight poly（L-lactic acid）（PLLA） was prepared under microwave irridiation. The influences of catalyst content, reaction temperature and reaction time on the molecular weight of products were analyzed by orthogonal test. PLLA with a high molecular weight of 16.21 × 10^4 was obtained at the optimal polymerzatinos conditions. The products were also characterized by FTIR, ^1H-NMR, DSC, XRD, polarimeter and mechanical test. The results showed that PLLA products exhibited high purity, good crystallinity and satisfactory mechanical performance.