Abstract
AbstractDouble network hydrogels (DN gels) demonstrate extremely high strength and toughness; however, conventional DN gels are fully chemically crosslinked, which are often softening and lack self‐healing. Here, a new type of fully physical DN (P‐DN) gels, that is, K+ ions crosslinked κ‐carrageenan (K+C) microgel (MG) composite hydrophobically crosslinked polyacrylamide (HPAAm) gels or K+C‐MG/HPAAm gels, in which the HPAAm gel was physically crosslinked by hydrophobic interactions as well as topologically crosslinked by P‐DN microgels, were prepared by a facile one‐pot method. At the optimal condition, K+C‐MG/HPAAm gel exhibited high strength (0.36 MPa) and high toughness (968 J/m2). In addition, it can rapidly recover from softening and display good fatigue resistance. Notably, K+C‐MG/HPAAm gel also demonstrated self‐healing properties on account of its physical nature. Because there are anionic κ‐carrageenan and KCl, K+C‐MG/HPAAm gels are ionic conductive, which were used as strain sensors to monitor the human motions. We believe our K+C‐MG/HPAAm gels provide a new insight in the field of DN gels.
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