采用熔融共混和模压成型工艺制备了乙烯-1-辛烯共聚物(EOC)增韧聚乳酸(PLA)共混物,考察了EOC的含量对共混物微观形貌、力学性能和热性能的影响.结果表明:虽然马来酸酐(MAH)的原位增容能够在一定程度上改善EOC与PLA的界面相容性,但效果不佳,两者的界面结合较弱;随着EOC含量提高,EOC/PLA共混物的拉伸强度和弹性模量逐渐下降,而断裂伸长率和冲击韧性先增大再降低,并分别在EOC的质量分数为10％和20％时达到最大值;EOC与PLA的共混没有改变PLA相的热分解特性,但使EOC相的起始分解温度和最大分解温度向高温区偏移.
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