POE熔融接枝GMA的制备及其与PBT共混增韧

Toughening of Melt Grafting of GMA onto POE and PBT

在双螺杆挤出机上采用熔融接枝法制备了POE-g-GMA和POE-g-(GMA-co-St),考察了POE、POE-g-GMA和POE-g-(GMA-co-St)对聚对苯二甲酸丁二醇酯(PBT)的增韧作用。结果表明:POE和单组分接枝的POE-g-GMA对PBT的缺口冲击韧性的改善作用都不大;而双组分接枝的POE-g-(GMA-co-St)对PBT具有显著的增韧作用。当弹性体POE-g-(GMA-co-St)用量为15%时,共混物的缺口冲击强度为45.84 kJ/m2,是缺口冲击强度为1.28 kJ/m2的纯PBT的35倍多。SEM显示,PBT/POE-g-(GMA-co-St)共混体系中分散相比PBT/POE-g-GMA共混体系的分散相具有更好的分散性。同时对比了几种外来增韧剂对PBT性能的影响。

POE-g-GMA and PBT/POE-g-（GMA-co-St） were prepared by melt grafting in the twin screw extruder. The toughening effects of POE,POE-g-GMA and PBT/POE-g-（GMA-co-St） on PBT were studied. The results indicated that ungrafted POE and single monomer grafted copolymer POE-g-GMA had little improvement on the Izod impact strength of PBT,whereas bi-monomer grafted copolymer PBT/POE-g-（ GMA- co-St） had significant toughening effects on PBT. When the contents of POE-g-（GMA-co-St） was up to 15% , the Izod impact strength was 45.84kJ/m^2, which was as more as 35 times than that of net PBT. SEM micrographs showed that dispersion domains in PBT/PBT/POE-g-（ GMA-co-St） blend exhibited a better dispersity than PBT/POE-g-GMA blend. Comparisons of the toughening effects of PBT/POE-g-（GMA-co-St） with other commercial samples on PBT were made.