复合增塑剂制备低温响应聚乳酸基形状记忆材料的研究

Study on Preparation of Low-Temperature Response Polylactic Acid-Based Shape Memory Material with Compound Plasticizer

制备聚乳酸(PLA)/聚己内酯基聚氨酯弹性体(PCL-TPU)形状记忆共混物,研究DOP/Mesamoll复合增塑剂对PLA/PCL-TPU形状记忆共混物性能的影响。结果表明:增塑剂的加入促进了PLA/PCL-TPU地均匀热降解。同时,DOP、Mesamoll及DOP+Mesamoll复合增塑剂能够有效降低PLA/PCL-TPU的玻璃化转变温度(Tg)。但DOP存在易析出的缺点,而Mesamoll的稳定性则明显优于DOP。综合增塑剂迁移率、TG分析和成本等多因素,复合增塑剂可替代单组分增塑剂得到具有低温响应的形状记忆共混物。

A shape memory blend of polylactic acid(PLA)/polycaprolactone based polyurethane elastomer(PCL-TPU) was prepared, and the effect of DOP/Mesamoll composite plasticizer on the properties of PLA/PCL-TPU shape memory blend was studied. The results showed that the addition of plasticizers promoted the uniform thermal degradation of PLA/PCL-TPU. At the same time, DOP, Mesamoll and DOP+Mesamoll composite plasticizers can effectively reduce the glass transition temperature(Tg) of PLA/PCL-TPU. However, DOP has the disadvantage of easy precipitation, and the stability of Mesamoll is significantly better than DOP. Considering multiple factors such as plasticizer mobility, TG analysis, and cost, composite plasticizers can replace single-component plasticizers to obtain shape memory blends with low temperature response.