为提升聚丙烯（PP）的耐热温度，拓宽PP材料的应用范围，选择马来酸酐接枝氢化苯乙烯-丁二烯嵌段共聚物（SEBS-g-MAH）作为聚对苯二甲酸丁二醇酯（PBT）与PP共混体系的相容剂，并与马来酸酐接枝聚丙烯共聚物（PP-g-MAH）的作用对比，制备PP/PBT共混物。差示扫描量热仪（DSC）、扫描电镜（SEM）分析和力学性能测试结果表明，SEBS-g-MAH有效提升了PP与PBT的相容性，制备的PP/PBT/SEBS-g-MAH（80/20/15）共混物与纯PP相比，热变形温度提升15 ℃，缺口冲击强度提升50%左右。SEBS-g-MAH与PBT的端羧基反应，改变了PBT的分子结构对称性，使PBT的结晶能力下降，同时在PP与PBT之间起到反应增容作用，提升了共混物的综合性能。

In order to improve the heat resistance temperature of polypropylene (PP) and broaden the application range of PP material, maleic anhydride grafted hydrogenated styrene-butadiene block copolymer (SEBS-g-MAH) was selected as the compatibility agent of polybutylene terephthalate (PBT) and PP blending system, and the effect of compatibility agent of SEBS-g-MAH was compared with that of PP-g-MAH to prepare PP/PBT blends. Differential scanning calorimeter (DSC), scanning electron microscopy (SEM) analysis and mechanical properties test results showed that SEBS-g-MAH effectively improved the compatibility of PP and PBT. Compared with pure PP, the heat deflection temperature of the prepared PP/PBT/SEBS-g-MAH (80/20/15) blend was increased by 15 ℃, and the notch impact strength was increased by about 50%. The terminal carboxyl reaction of SEBS-g-MAH and PBT changed the molecular structure symmetry of PBT, reduced the crystallization ability of PBT, increased the reactive compatibilization between PP and PBT, and improved the comprehensive performance of the PP/PBT blend.