聚丙烯（PP）作为三大通用塑料之一，已被广泛应用于医疗、汽车、包装等领域。文章综述了近年来原位微纤技术在PP发泡材料、导电材料及增强增韧PP方面的研究进展。结果表明：通过在PP中原位形成微纤，可以提高PP的熔体强度，减少PP在发泡过程中泡孔合并，从而减小泡孔尺寸并提高泡孔密度，有效改善了PP的发泡性能；通过形成导电微纤网络结构可以有效的降低材料的逾渗阈值；原位形成的微纤可以显著提高PP的结晶能力，部分聚合物微纤还能诱导PP形成串晶结构，实现PP的增强增韧。同时，在相容剂的协同作用下，聚合物微纤对PP的增强及增韧效果更加明显。

Polypropylene (PP), as one of the three universal plastics, has been widely used in fields such as medical, automotive, and packaging, etc. The article reviewed the research progress of in-situ microfibrillar technology in PP foaming material, conductive material, and reinforcing and toughing PP in recent years. The results showed that by forming in-situ microfibrils in PP, the melt strength of PP can be improved, the merging of bubbles during the foaming process was reduced, the size of bubbles decreased and the density of bubbles increased, the foaming performance of PP was improved. By forming a conductive microfibrillar network structure in PP, the percolation threshold of PP composites can be effectively reduced. The in-situ formation of microfibrils can significantly improve the crystallization ability of PP, and some polymer microfibrils can induce the formation of shish kebab structure in PP, achieving reinforcement and toughening of PP, meawhile, under the synergistic effect of compatibilizers, its reinforcement and toughening effect on PP was more obvious.