Hydrogel
has great application prospect in the field of flexible
wearable devices; however, its poor antifreezing and antidrying properties
hinder its applications in wearable devices. Herein, a self-adhesive
glycerol-hydrogel (G-hydrogel) with antifreezing and antidrying properties
was prepared successfully. The glycerol and water double-solvent system
endowed excellent antifreezing and antidrying properties with hydrogel,
which ensured the flexibility of the G-hydrogel even after being frozen
for 24 h at −15 °C or stored at room temperature for a
long time. Polydopamine (PDA)-intercalated bentonite (BT) incorporated
into the G-hydrogel contributed good comprehensive mechanical property
to the G-hydrogel. The peeling test results confirmed that G-hydrogel
has good adhesion to natural and synthetic materials because of the
existence of PDA with catechol structure. Particularly, the G-hydrogel
presented marvelous sensing capabilities for strain and pressure and
could monitor the movements of a human. In summary, this kind of self-adhesive,
antidrying, and antifreezing hybrid G-hydrogel may be a very promising
soft material for flexible wearable devices.
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