苹果酸对聚乳酸/热塑性淀粉共混物结构与性能的影响  

Effect of Malic Acid on Sturcture and Properties of PLA/TPS Blend

作　　者：黄宇[1] 邓晶晶[1] 张清松[1] 吴智华[1] 

机构地区：[1]四川大学高分子科学与工程学院,四川成都610065

出　　处：《塑料科技》2009年第10期45-49,共5页Plastics Science and Technology

摘　　要：将天然淀粉用甘油改性后制得了热塑性淀粉(TPS),再通过熔融共混法制备了聚乳酸(PLA)/TPS共混物。通过SEM、TG、DSC分析和拉伸性能、吸水性能、流变性能测试,研究了苹果酸对TPS和PLA/TPS共混物结构和性能的影响。结果表明:苹果酸能促进淀粉酸解,使TPS分散相尺寸减小,在PLA基体中的分布更加均匀;苹果酸能提高PLA/TPS共混物的拉伸性能;苹果酸对PLA/TPS共混物的玻璃化转变温度、熔融温度及冷结晶温度影响较小;少量的苹果酸可降低PLA/TPS共混物的吸水率。The natural starch was modified by glycerin to prepare thermalplastic starch （TPS）, and then the PLA/TPS blend was prepared by melt blending. The effects of malic acid on the structure and properties of PLA/TPS blend were studied by SEM, TG, DSC analysis and tensile strength, water absorption, rheological property tests. The results show that： malic acid could accelarate the acidolysis of the starch, decrease the size of TPS, and make the distribution of TPS in the matrix PLA more uniformly; malic acid could improve the tensile property of PLA/TPS blend; the effects of maUc acid on glass transition temperature, melting temperature, and cold crystallization temperature of PLA/TPS blend are limited; a small amount of malic acid could decrease the water absorption of PLA/TPS blend.

关 键 词：聚乳酸 热塑性淀粉 共混物 苹果酸 结构 性能 

分 类 号：TQ320.[化学工程—合成树脂塑料工业]