Toward sustainable, flame-retardant, antimicrobial, and cross-linked waterborne polyurethane via intrinsic modification with a fully biobased chain extender - Limin Gu; Ziyan Ren; Shuai Li; Renjie Song; Xueqing Qin; Yan Su; Haixia Wu; Linya Zhang; Fengxia Sun (Chemical Engineering Journal, 2026)