Tóm tắt

A purely physically crosslinked double network (DN) hydrogel, poly(sulfobetaine-co-acrylic acid)/chitosan-ci-trate (P(SBMA-co-AAc)/CS-Cit) DN hydrogel, was prepared based on electrostatic interaction and hydrogenrnbonding between the polymer chains. The hydrogel is highly stretchable, transparent, anti-fatigue, self-adhesivernand has good self-healing properties with a self-healing efficiency as high as 95.4%. Furthermore, the resistancernof the P(SBMA-co-AAc)/CS-Cit DN hydrogel is sensitive to a wide strain window and the relative resistancernshows stable and reliable change during deformation. Herein, the hydrogel was demonstrated as a strain sensorrnto detect human motions, such as joint bending and swallowing. More excitingly, before ionic crosslinking, the Prn(SBMA-co-AAc)/CS-Cit composite hydrogel is injectable, thus the P(SBMA-co-AAc)/CS-Cit DN hydrogel sensorrncan be made into various complex shapes by injecting the P(SBMA-co-AAc)/CS-Cit composite hydrogel intorncitrate solution, including multilayer structures, exhibiting a great potential for applications as 3D printing strainrnsensors.