热塑性乙酰化淀粉/聚乳酸的性能及形态  

Properties and morphology of thermoplastic acetylated starch/polylactide composites

作　　者：李海东[1] 孙朋[1] 程凤梅[1] 

机构地区：[1]长春工业大学化学工程学院,长春130012

出　　处：《复合材料学报》2012年第6期55-59,共5页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(21071142)

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.

关 键 词：聚乳酸 热塑性乙酰化淀粉 甘油 增塑剂 性能 

分 类 号：TB332[一般工业技术—材料科学与工程]