Research Progress on the Formation and Self-healing Mechanisms of Double-network Hydrogels
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Abstract:
Double network (DN) hydrogel is a special interpenetrating network hydrogel composed of a rigid first network and a flexible second network. The synergy of the two networks makes the DN hydrogel possess excellent mechanical properties. DN hydrogel has higher mechanical strength, toughness and modulus, which makes the research on DN hydrogel more extensive. In recent years, great progress has been made on DN hydrogel, which not only solved the problems related to the fragile and brittle characteristics of traditional hydrogels, but also expanded their application range. In addition, some DN hydrogels have self-healing properties which extend the service life of hydrogels to a certain extent. In this paper, the crosslinking methods of DN hydrogels (chemical crosslinking, physical/chemical crosslinking, dual physical crosslinking) are compared. The formation mechanisms of DN hydrogel are summarized. The self-healing mechanisms of DN hydrogels are reviewed from two aspects, dynamic covalent interaction and non-covalent interaction, which provide ideas for design and application of intelligent DN hydrogels.
