T-shaped trifunctional crosslinker-toughening hydrogels  

作　　者：Ll QingYu XU ZiYang ZHANG DongFei YANG JianHai LIU WenGuang 

机构地区：[1]School of Materials Science and Engineering,Tianjin Key Laboratory of Composite and Functional Materials,Tianjin University,Tianjin 300350,China

出　　处：《Science China(Technological Sciences)》2020年第9期1721-1729,共9页中国科学（技术科学英文版）

基　　金：supported by the National Key Research and Development Program of China (Grant No. 2018YFA0703100);the National Natural Science Foundation of China (Grant No. 51733006)。

摘　　要：Currently, development of a single network hydrogel with a high fracture toughness in swelling equilibrium remains challenging.In this work, a novel T-shaped trifunctional crosslinker(T-NAGAX) with dual vinyl on the backbone and dual amide group on the side chain is synthesized by Michael addition and acylation. The T-NAGAX is used to prepare chemically crosslinked hydrogel by one-pot photo-initiated polymerization. The resulting single network hydrogels of representative polyacrylamide(PAAm), poly(N-acryloyl 2-glycine)(PACG), and poly(N-isopropyl acrylamide)(PNIPAM) crosslinked with T-NAGAX with additional hydrogen-bonds exhibit much better fracture toughness than that of the corresponding hydrogels crosslinked by N,N'-methylene bisacrylamide, a conventional crosslinker;higher mechanical strengths are observed in the T-NAGAX crosslinked hydrogels. These hydrogels are promising to be exploited as load-bearing soft tissue substitutes. This T-NAGAX crosslinker can be expanded to toughen various types of hydrogels.

关 键 词：single network hydrogen bond hydrogel TOUGHNESS CROSSLINKER 

分 类 号：TQ427.26[化学工程]