高性能环境友好PLA/PPC/PLA-g-GMA复合材料的制备与性能研究

Preparation and Properties of High-Performance Eco-Friendly PLA/PPC/PLA-g-GMA Composites

通过聚乳酸(PLA)与甲基丙烯酸缩水甘油酯(GMA)制备PLA-g-GMA接枝共聚物,将PLA-g-GMA与PLA、聚碳酸亚丙酯(PPC)熔融共混,制备PLA/PPC/PLA-g-GMA共混材料,研究PLA-g-GMA的含量对PLA/PPC/PLA-g-GMA共混材料的热学性能、力学性能、光学性能以及微观形态的影响。结果表明:PLA与GMA可以成功进行熔融接枝反应,生成的PLA-g-GMA可以改善PLA与PPC之间的相容性。随着PLA-g-GMA含量的增加,共混材料的维卡软化温度逐渐升高,而其起始分解温度及完全分解温度略有降低。当共混材料的拉伸强度保持不变,共混材料的断裂伸长率、冲击强度随PLA-g-GMA含量的增加呈现先增加后降低的趋势。PLA-g-GMA含量为10%时,共混材料的力学性能最佳,其断裂伸长率、冲击强度分别为236.46%、5876.90 J/m^(2),此时冲击断面表现明显的韧性断裂特征。共混材料的雾度随PLA-g-GMA含量的增加逐渐降低,而透过率略有提升,整体表现优异的光学性能。

PLA-g-GMA graft copolymer was prepared by polylactic acid(PLA)and glycidyl methacrylate(GMA).PLAg-GMA was melt blended with PLA and poly(propylene carbonate)(PPC)to prepare PLA/PPC/PLA-g-GMA blends.The effects of PLA-g-GMA contents on the thermal properties,mechanical properties,optical properties and micromorphology of PLA/PPC/PLA-g-GMA blends were studied.The results show that PLA and GMA can be successfully grafted by melting,and the generated PLA-g-GMA can improve the compatibility between PLA and PPC.With the increasing of PLA-g-GMA contents,the Vicat softening temperature of the blends increase gradually,but the initial decomposition temperature and complete decomposition temperature decrease slightly.When the tensile strength of the blends remains unchanged,the elongation at break and impact strength of the blend material increase first and then decrease with the increasing of PLA-g-GMA contents.When the grafting content is 10%,the mechanical properties of the blends are the best,and the elongation at break and impact strength are 236.46%and 5876.90 J/m^(2),respectively,and the impact section shows obvious ductile fracture characteristics.The haze of the blends gradually decrease with the increasing of PLA-gGMA contents,while the transmittance slightly increase,showing excellent optical properties.