As one of the most broadly applied general plastics

polypropylene (PP) has played a significant role in the economy and everyone’s daily life. The performance of PP and its blends are determined largely by the microstructure and morphology

including the crystal type

crystallinity

orientation

phase morphology. We summarized the research advances in our group regarding the structure and property relationship of PP and its blends. The topics cover the PP/ nucleating agents

PP in-reactor alloys

PP/elastomer blends

and PP/rigid particle compounds. There is a clear mismatch between the rapid growth in productivity of PP general grade resins and the shortage of high-end PP resins. It is essential to continue the study of the basic structure and properties relationship of PP materials.