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Physically cross-linked hydrogels with a different type of noncovalent interactions. (a) The GSP-HPAM composite hydrogel with hydrophobic association; (b) schematic illustration for PVA/CP hydrogel, and self-healed by hydrogen bonding; (c) schematic diagram of internal structure of PNIPAM-b-CD/GO hydrogel based on host–guest interaction; (d) schematic illustration of hydrogel synthetic process, coordination modes and self-healing properties.
