MAH/GMA共接枝聚乳酸对木粉/PLA复合材料性能的影响

采用熔融接枝法分别制备马来酸酐接枝聚乳酸、甲基丙烯酸缩水甘油酯接枝聚乳酸和马来酸酐/甲基丙烯酸缩水甘油酯共接枝聚乳酸,并利用红外光谱对接枝共聚物进行结构表征。分别以三种接枝共聚物为相容剂,采用注塑成型制备了木粉/PLA复合材料。利用扫描电子显微镜(SEM)对复合材料的断面形貌进行微观分析,结果表明,加入不同接枝共聚物后木粉/PLA复合材料两相看不出明显相界面,界面相容性得到改善。对不同接枝共聚物制备的复合材料的力学性能、加工流动性能和动态流变性能测定的结果显示,加入MAH/GMA共接枝聚乳酸后的木粉/PLA复合材料和未添加相容剂的复合材料相比,拉伸强度和冲击强度分别提高了9.54%和7.23%,复合体系的平衡扭矩和剪切热提高,储能模量及复数黏度均增大。

Influence of Maleic Anhydride/Glycidyl Methacrylate Cografted Polylactic Acid on Properties of Wood Flour/PL A Composites

Graft copolymers of PLA-g-MAH ,PLA-g-GMA and PLA-co-MAH/GMA were prepared by means of melt grafting .The structure of the graft copolymers were characterized by FTIR .Wood flour/PLA composites were prepared by injection molding with three kinds of graft copolymers as compatibilizers ,and the fractured morphology of composites was investigated by scanning electron mi-croscope (SEM ) .Results show that there is no obvious phase interface between wood flour and PLA , which indicating the interfacial compatibility of wood flour /PLA composites is improved after adding different graft copolymers .The determination results of mechanical properties ,processing flowability and dynamic rheological property of composites prepared with different graft copolymers reveal that , compared to the composite without compatibilizer ,the tensile strength and impact strength of wood flour /PLA composites are increased by 9 .54% and 7 .23% respectively ,and the equilibrium torque , shear heat ,storage modulus and complex viscosity are all increased after adding maleic anhydride/gly-cidyl methacrylate cografted polylactic acid .