Super-tough, anti-fatigue, self-healable, antifogging and UV shielding hybrid hydrogel prepared via simultaneous dual in-situ sol-gel technique and radical polymerization
In this work, we proposed a universal strategy to construct tough hybrid hydrogels simply by dual in-situ sol-gel reaction of vinyltriethoxysilane (VTES) and tetrabutyl titanate (TBOT), as well as in-situ radical polymerization of acrylamide (AM) and VTES. Interestingly, nano-SiO2 and nano-TiO2 acted as both multifunctional hybrid crosslinker and nanofiller in this hybrid hydrogel. Meanwhile, covalently bond consisted between TiO2 and SiO2, as well as polymers and SiO2, and non-covalently interaction existed between TiO2 and polymers, as well as the organic skeleton. The obtained hybrid hydrogel exhibited high tensile strength (38.78-330.50 kPa), medium tensile elastic modulus (26.53-120.48 kPa), ultrahigh compression strength (1.86-6.22 MPa), unprecedented fatigue resistance and self-healable due to its unique hierarchical inorganic hybrid crosslinking mechanism. In addition, this hydrogel also displayed considerable antifogging and UV-shielding property. So this hybrid hydrogel will have many potential to be used as soft robots, substitutes for load-bearing tissues, and optical devices.