 Polar functional groups can improve the polymer properties of polyolefins but also poison the metal catalyst used during the polymerization reaction. Here, the authors show that functionalized bimodal polyolefins in which the high molecular weight fraction bears few functional groups and possesses high mechanical and melt properties can be used to implement both polarity and processability. This article was authored by Chen Zhu, Kuan Wang, Du Weifu Xi, and others.