An ultrasound-induced MXene doped PAM–SA super-tough hydrogel
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Abstract
Here we reported a novel ultrasound-induced polymerization to achieve a polyacrylamide–sodium alginate (SA) dual network hydrogel via a redox reaction with MXene (Ti3C2) as a reductant and potassium persulfate (KPS) as an oxidant. Polymerization of acrylamide was carried out at 15 °C for only 5 min with a mass ratio of MXene:KPS of 1/10, and the hydrogel was further immersed in a 10 wt% CaAc2 solution for 1.5 h. Super-toughness (elongation at break of 1728% and toughness of 2633.7 KJ m−3) and excellent conductivity (up to 3.5 S m−1) were achieved, mainly due to coordinated regulation of MXene and Ca2+. MXene also acted as a crosslinker to effectively transfer the stress to polymer chains under the external force. The secondary cross-linking was achieved by the dynamic complexation between –COO− of SA and the continuously released Ca2+ from CaAc2. The strategy employed in this paper will be helpful to prepare intelligent flexible strain sensors.
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