PBT/官能化聚烯烃弹性体共混体系的力学性能与相形态

考察了马来酸酐接枝乙烯-辛烯共聚物（POE-g-MAH）和乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯三元共聚物（E-MA-GMA）对聚对苯二甲酸丁二醇酯（PBT）的增韧作用。结果表明，未接枝的POE弹性体对PBT缺口冲击韧性的改善作用不大。两种官能化聚烯烃弹性体（E-MA-GMA、POE-g-MAH）对PBT具有显著的增韧作用。当弹性体用量分别达到8．5％和10％以后，共混物都各自出现明显的脆／韧转变现象。这意味着在达到同样的冲击韧性时，PBT／E—MA—GMA共混体系的拉伸强度损失较小。SEM显示，PBT／E—MA—GMA共混体系中分散相具有更细微的分散，有效地诱导PBT基体产生银纹和剪切屈服，消耗大量的冲击能。

Mechanical Properties and Morphology of PBT/Functional Polyolefin Elastomer Blend

The toughening effects of POE-g-MAH and E-MA-GMA on PBT were studied.The results indicated that ungrafted POE had little improvement effect on the notched impact strength of PBT,whereas two types of functional polyolefin elastomers (E-MA-GMA,POE-g-MAH) had significant toughening effects on PBT.When the contents of the functional polyolefin elastomers were up to 8.5% and 10% respectively,britlle-to-ductile transitions of the two blends took place,which showed the loss of tensile strength of PBT/E-MA-GMA blend was less when the same notched impact strength was obtained.SEM micrographs showed that dispersion domains in PBT/E-MA-GMA blend exhibited a smaller size,which would induce craze and shear yielding effectively in PBT matrix,exhausting impact energy massively.