以乳酸(D,L-LA)和ε-己内酯(ε-CL)为原料,采用梯度升温法,通过直接熔融缩聚合成了系列端羟基聚(乳酸-己内酯)共聚物(PLCA).最佳工艺条件为:压力0.098MPa,催化剂Sn(Oct)2用量0.8%(质量分数),n(D,L-LA)∶n(ε-CL)=8∶2,聚合温度170℃,反应7h.用特性粘度、FT-IR、1H-NMR、XRD、DSC等对其进行表征,结果表明,系列PLCA中的粘均分子量最大可达20785,Tg均比PLA的小,且随ε-CL含量的增加,Tg越小,有效改善了PLA的脆性.结晶度比PLA有所降低,说明ε-CL的加入使柔韧性增强.
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