High-impact polypropylene (HIPP) is a commercially important polymer alloy with complex morphological structure. In this contribution, two commercial HIPPs have been investigated in detail by atomic force microscopy-infrared in conjunction with local thermal analysis to determine the composition and structure of the nanodomains. Both alloys contain numerous core-shell rubber particles dispersed in polypropylene matrix. In HIPP-1, the rigid cores of the particles are rich in polypropylene, which is highly crystalline, whereas for HIPP-2, the major component of the rigid cores is polyethylene with a high degree of crystallinity. The formation of these very different structures and compositions in the core and rubber domains may be attributed to different chain structures and compositions of the copolymers in the alloys produced by different catalysts.

高抗冲聚丙烯（HIPP）是具有重要形态结构的商业上重要的聚合物合金。在此贡献中，已通过原子力显微镜红外结合局部热分析详细研究了两种商用HIPP，以确定纳米域的组成和结构。两种合金均包含许多分散在聚丙烯基质中的核-壳橡胶颗粒。在HIPP-1中，颗粒的刚性核富含高结晶度的聚丙烯，而对于HIPP-2，刚性核的主要成分是具有高结晶度的聚乙烯。