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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.