二醋酸纤维素酯接枝聚乳酸的制备及性能研究

以辛酸亚锡为催化剂，二醋酸纤维素酯为接枝骨架，在真空熔融条件下通过meso-丙交酯的开环聚合反应，制备了二醋酸纤维素酯接枝聚乳酸的共聚物(PLA-g-CDA).使用FTIR, DSC和拉伸实验等多种表征手段对接枝共聚物的性质进行了表征.重点研究了原料用量、催化剂用量、反应温度、反应时间和反应氛围对单体转化率和接枝率的影响，并对接枝共聚物的成膜性、相容性和力学性能进行了评估.结果表明：真空反应环境下，原料meso-丙交酯与二醋酸纤维素酯的投料比为4∶1，催化剂辛酸亚锡用量为二醋酸纤维素酯质量的5%，反应温度140 ℃，反应时间30 min时，产物的接枝率达到72%.随着PLA接枝率的升高，PLA-g-CDA更容易成膜，相容性得到改善，力学性能也得到增强.
The grafting copolymer (PLA-g-CDA) was prepared by using Sn(Oct)2 as catalyst and grafting meso-lactide onto the cellulose diacetate in the vacuum melting environment. The copolymer was characterized using FTIR, DSC and stretching test. The effects of feed weight ratio, catalyst content, reaction temperature, reaction time and reaction atmosphere on the monomer conversion and grafting ratio were examined. The film compatibility and mechanical properties of the grafting copolymer were then evaluated. The results showed that in the vacuum reaction environment, feed weight ratio of meso-lactide and cellulose acetate was 4∶1, catalyst content was 5%, reaction temperature was 140 ℃, reaction time was 30 min, and grafting rate of the product was higher. With the increase of PLA grafting rate, PLA-g-CDA was filmed more easily, and the compatibility as well as the mechanical properties was improved.