环氧基团功能化弹性体增韧聚乳酸的性能

Properties of Poly(lactic acid) Toughened by Epoxy-functionalized Elastomer

以2种不同结构的弹性体乙烯-辛烯共聚物接枝甲基丙烯酸缩水甘油酯(POE-g-GMA)和乙烯-丙烯酯甲酯-甲基丙烯酯缩水甘油酯三元共聚物(E-MA-GMA)增韧聚乳酸(PLA),研究了接枝型与嵌段型弹性体的结构对聚乳酸增韧效果的影响.结果表明,接枝型聚合物POE-g-GMA与基体PLA之间具有良好的界面相互作用,当POE-g-GMA的质量分数为15%时,共混体系的缺口冲击强度为72.4 kJ/m2,而E-MA-GMA的质量分数为15%时,共混体系的缺口冲击强度为32.4 kJ/m2,结果表明,接枝型聚合物POE-g-GMA增韧效果明显优于嵌段型E-MA-GMA.

Poly（lactic acid）（PLA） was toughened by reactive blending with epoxy-functionalized elastomer glycidyl methacrylate grafted poly（ethylene octane）（POE-g-GMA） and ethylene-methyl acrylate-glycidyl methacrylate random terpolymer（E-MA-GMA）.The result shows that POE-g-GMA is more effective than E-MA-GMA to toughen PLA.When the mass fraction of POE-g-GMA is 15%（mass fraction）,the notched impact strength of the PLA/POE-g-GMA blend is as high as 72.5 kJ/m2,while the impact strength of PLA/E-MA-GMA blend is only 32.4 kJ/m2 when the E-MA-GMA is 15%（mass fraction）.The scanning electron microscopy displayed better interfacial adhesion for PLA/POE-g-GMA blends than PLA/E-MA-GMA,which was well consistent with their results of mechanical properties.