热塑性乙酰化淀粉／聚乳酸的性能及形态

摘要

采用熔融共混的方法制备了热塑性乙酰化淀粉（TPAS）／聚乳酸（PLA）复合材料，研究了TPAS／PLA复合材料力学性能、热性能和形态结构。TPAS以乙酰化改性淀粉为基体，甘油为增塑剂。实验结果表明：随着TPAS含量的增加，TPAS／PLA复合材料韧性明显提高，当TPAS加入量为40％（质量分数）时，断裂伸长率提高4倍多，同时TPAS的加入对复合材料的热稳定性影响不大。DSC、DMTA和SEM分析结果表明，PLA与TPAS是不相容的。%The polylactide(PLA) and thermoplastic acetylated starch(TPAS) composities were prepared by molten blending method, and the mechanical properties, thermal properties and morphology of TPAS/PLA composites were investigated. TPAS was prepared with acetylated starch as matrix and glycerol as plasticizer. The experimental results show that the toughness of TPAS/PLA composite was significantly improved with the increase of TPAS. The elongation at break of TPAS/PLA improves by four times as much as pure PLA with TPAS mass fraction of 40%. In addition, TPAS has little effect on the thermal stability of PLA/ATPS composites. DSC, dynamic mechanical analysis and SEM results indicate that PLA and ATPS are immiscible.