Preparation and study of modified polyethyleneimine cationic adjuvant Lu Bai, Chengyu Li, Xiaoqi Chen, Haijun Zhou, Fen Zhang, Hua Cheng, Yantao Li and Mengmeng Zhou E3S Web Conf., 416 (2023) 01008 Published online: 10 August 2023 DOI: 10.1051/e3sconf/202341601008