研究了2种烯烃嵌段共聚物(OBC1和OBC2)与等规聚丙烯(iPP)的相容性,其中2种烯烃嵌段共聚物具有相近的软硬段组成,软硬段中辛烯含量接近,但分子量不同.通过对OBC线性黏弹性的研究发现高分子量的OBC1会发生较强的介观相分离,而在所研究的温度范围内,低分子量的OBC2保持均相.利用了液滴回缩和流变学的方法测量了2种iPP/OBC共混体系的界面张力,同时采用动态力学分析研究了共混物中组分玻璃化转变温度的变化,并通过自浓度模型估算了2种OBC与iPP互溶的溶解度.结果发现虽然OBC1与iPP的界面张力较高,但二者之间的相容性却优于OBC2与iPP的相容性,这很可能是OBC1分子量大,嵌段共聚物的强介观相分离所导致其与iPP相容性更好.对iPP/OBC共混体系结晶行为的研究也证实了相容性差异对共混物中等规聚丙烯结晶行为的影响. The compatibility of two kinds of olefin block copolymers (OBC1 and OBC2) with isotactic polypropylene (iPP) was studied. The two kinds of olefin block copolymers had similar soft and hard segments, the octene content Close to but with different molecular weights.By studying the linear viscoelasticity of OBC, strong mesophase separation occurred in high molecular weight OBC1, while the low molecular weight OBC2 remained homogeneous in the temperature range studied. Shrinkage and rheology methods were used to measure the interfacial tension of the two iPP / OBC blends. The dynamic glass transition temperature of the blends was also studied by dynamic mechanical analysis. The self-concentration model estimated the interfacial tension of 2 The results showed that although the interfacial tension between OBC1 and iPP was higher, the compatibility between OBC1 and iPP was better than that between OBC2 and iPP, which was probably that OBC1 had high molecular weight and block The strong mesophase resolution of the copolymer led to its better compatibility with iPP.The crystallization behavior of iPP / OBC blends also confirmed the influence of the compatibility difference on the crystallization behavior of the isotactic polypropylene in the blends.