The invention discloses high-
toughness self-repairing physical hydrogel based on dual
ion coordination and a preparation method thereof. The physical hydrogel has multi-crosslinking sites. The preparation method of the high-
toughness self-repairing physical hydrogel comprises the following steps: dissolving N-carboxyethyl
chitosan (CEC),
acrylic acid (AA), an FeCl3 water solution and a CaCl2 watersolution into de-ionized water according to a certain ratio and carrying out ultrasonic treatment to obtain a uniform and transparent solution; then carrying out vacuum
deoxygenation on the solution;adding an
ammonium persulfate (APS) water solution and a catalyst N,N,N',N'-tetramethyldiethylamine (TEMED) in sequence under the protection of
nitrogen gas; reacting for at least 4h under the condition of 30 to 50 DEG C, so as to prepare the physical hydrogel. The physical hydrogel provided by the invention has excellent mechanical properties and self-repairing properties;
metal ions are introduced so that the gel has certain
ionic conductivity; furthermore, an application range of the
chitosan based self-repairing hydrogel is expanded; the high-
toughness self-repairing physical hydrogel ishopefully applied to fields including wearable flexible electronic devices, soft-bodied robots, biomedicines,
aerospace and the like.