Compared with poly(butylene terephthalate)/glycidyl methacrylate grafted poly(ethylene–octene) (PBT/POE‐g‐GMA) binary blends, supertough PBT‐based ternary blends with little rigidity loss were successfully obtained by adding rigid polypropylene (PP) into PBT/POE‐g‐GMA blends to construct core–shell particles during melt blending. The effects of PP content and type on the phase morphology and mechanical properties of the blends were systematically investigated. Theoretical predictions and scanning electron microscopy observation showed that a core–shell structure was formed in PBT matrix with PP as the core and POE‐g‐GMA as the shell. The mechanical property tests showed that POE‐g‐GMA and PP had significant synergistic toughening effect. When PP with high melt flow index (H‐PP) was used, PBT/POE‐g‐GMA/H‐PP (70/15/15) blends possessed the highest Izod notched impact strength, which was 1.9‐fold compared with PBT/POE‐g‐GMA (70/30) binary blends, while the tensile performance loss was little. The essential work of fracture tests was performed to evaluate the fracture resistance of different samples. The results demonstrated that PBT/POE‐g‐GMA/PP ternary blends possessed much better resistance to crack propagation than PBT/POE‐g‐GMA binary blends. The decrease of interparticle distance and the fibrillation of core–shell particles activated intense matrix shear yielding, which was the reason for the high crack resistance of ternary blends. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48872.

中文翻译：

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制备具有良好刚性和韧性平衡的PBT / POE-g-GMA / PP三元共混物

与聚对苯二甲酸丁二酯/甲基丙烯酸缩水甘油酯接枝的聚（乙烯-辛烯）（PBT / POE- g- GMA）二元共混物相比，通过将刚性聚丙烯（PP）添加到聚乙烯中，可以成功地获得具有很少刚性损失的高韧性基于PBT的三元共混物。 PBT / POE- g- GMA共混物可在熔融共混过程中构建核-壳颗粒。系统地研究了PP含量和类型对共混物相形态和力学性能的影响。理论预测和扫描电子显微镜观察表明，在PBT基质中形成了核-壳结构，其中PP为核，POE- g- GMA为壳。力学性能测试表明，POE- g‐GMA和PP具有明显的增效增效作用。当使用高熔体流动指数（H‐PP）的PP时，PBT / POE‐ g ‐GMA / H‐PP（70/15/15）共混物具有最高的艾佐德缺口冲击强度，是PBT的1.9倍/ POE - g- GMA（70/30）二元共混物，而拉伸性能损失很小。进行了断裂试验的基本工作，以评估不同样品的断裂强度。结果表明，PBT / POE-克-GMA / PP三元共混物具有更好的比PBT裂纹扩展性/ POE-克‐GMA二进制混合。颗粒间距离的减小和核-壳颗粒的原纤化激活了强烈的基体剪切屈服，这是三元共混物具有高抗裂性的原因。分级为4 +©2019 Wiley Periodicals，Inc.J.Appl。Polym。科学 2020，137，48872。