熔融法制备EPDM-g-GMA及其与PBT的共混增韧

MELT GRAFTING OF GMA ONTO EPDM AND POTENTIAL IN TOUGHNESS OF EPDM/PBT BLENDS

研究了 EPDM- g- GMA对 PBT的增韧作用及其增韧机理。在 XSS- 30 0转矩流变仪上根据自由基聚合通过熔融反应制备了 EPDM- g- GMA及其 PBT/ EPDM- g- GMA,用傅立叶变换红外光谱法考察接枝反应中特征官能团的存在 ,根据红外工作曲线测定了改性样品的接枝率 ,获得了共混物的冲击强度 ,在扫描电子显微镜下观察了共混物断面的微观形态。实验结果表明 ,当接枝共聚物的接枝率为 2 .3,分散相粒径在 0 .5 μm左右时 ,共混物的冲击强度可达 4 9.7k J/ m2 ,比纯 PBT提高了 30倍 ,接枝共聚物的存在可以改善 EPDM与 PBT间的相容性 ,EPDM对工程塑料 PBT的增韧作用是通过提高两相间的界面结合 。

EPDM g GMA was studied as toughness precursor of PBT, and the toughness mechanism was also discussed. EPDM g GMA and PBT/EPDM g GMA were prepared by melt free radical grafting in a batch mixer. The epoxy group and grafting yield of EPDM g GMA were characterized by FT IR, the morphology of the functionalized EPDM/PBT blends was analyzed with a scanning electron micorscope. The results show that the grafting yield of GMA is up to 2.3 phr(grams per 100 grams of EPDM) and the particle size of the dispersed phase(PBT) attains about 0.5 μm, the Izod notch impact strength of EPEM/PBT can reach to 49.70 kJ/m 2, which is 30 times of the pure PBT. The presence of EPDM g GMA reduced the particle size of the dispersed phase(PBT) along with improved cohesion between EPDM and PBT.