Polypropylene (PP) blended with rubber particles has been recognized for significantly increasing impact resistance, which is increasingly demanded in industries such as electric vehicles and consumer electronics. However, a comprehensive understanding of the toughening mechanisms underlying these lightweight impact-resistant materials is imperative for future research. This article provides a detailed review of the ductile-to-brittle (DB) transition behavior and the improvements in impact resistance observed in rubber-toughened PP blends. Firstly, the fracture behavior of homogeneous PP is summarized across different strain rates and temperatures, including the DB transition and yielding and crazing criteria. Furthermore, the influence of notches and defects on the DB transition is discussed extensively. Subsequently, the article examines the theoretical and practical aspects of the toughening mechanisms facilitated by the rubber phase in PP-rubber blends. The percolation model is used to investigate the inter-distance criterion between neighboring rubber particles and the impact of particle size and content on toughening behavior. The primary objective of this article is to enhance the understanding of the toughening behavior exhibited by PP and rubber blends. Additionally, this study aims to provide valuable insights for developing advanced lightweight materials using PP-based blends for various industrial applications.

与橡胶颗粒共混的聚丙烯 (PP) 已被认为可显着提高抗冲击性，这在电动汽车和消费电子产品等行业的需求日益增长。然而，未来的研究必须全面了解这些轻质耐冲击材料的增韧机制。本文详细回顾了在橡胶增韧聚丙烯共混物中观察到的延性到脆性 (DB) 转变行为以及抗冲击性的改进。首先，总结了均质 PP 在不同应变率和温度下的断裂行为，包括 DB 转变以及屈服和开裂标准。此外，还广泛讨论了缺口和缺陷对 DB 转变的影响。随后，本文研究了 PP-橡胶共混物中橡胶相促进的增韧机制的理论和实践方面。渗流模型用于研究相邻橡胶颗粒之间的间距准则以及颗粒尺寸和含量对增韧行为的影响。本文的主要目的是加深对 PP 和橡胶共混物所表现出的增韧行为的理解。此外，本研究旨在为使用聚丙烯共混物开发用于各种工业应用的先进轻质材料提供宝贵的见解。