An autonomously healable, highly stretchable and cyclically compressible, wearable hydrogel as a multimodal sensor

Jianfei Tie; Liduo Rong; Hongchen Liu; Bijia Wang; Zhiping Mao; Linping Zhang; Yi Zhong; Xueling Feng; Xiaofeng Sui; Hong Xu

doi:10.1039/C9PY01737B

An autonomously healable, highly stretchable and cyclically compressible, wearable hydrogel as a multimodal sensor†

Jianfei Tie,^a Liduo Rong,^a Hongchen Liu,^b Bijia Wang,

^ac Zhiping Mao,

*^ac Linping Zhang,^ac Yi Zhong,^ac Xueling Feng,^ac Xiaofeng Sui^ac and Hong Xu*^ac

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* Corresponding authors

^a Key Lab of Science and Technology of Eco-textile, Ministry of Education, College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, People's Republic of China
E-mail: hxu@dhu.edu.cn, zhpmao@dhu.edu.cn

^b Textile College, Zhongyuan University of Technology, Zhengzhou 450007, Henan Province, People's Republic of China

^c Innovation Center for Textile Science and Technology of DHU, Donghua University, Shanghai, 201620, People's Republic of China

Abstract

Stretchable, self-healable, conductive hydrogels have received increasing attention due to their broad range of applications, such as wearable devices and ionic skin. However, severe challenges remain in integrating fatigue resistance, favorable self-healing, and stretchable and compressible efficiency into a hydrogel. Herein, a highly stretchable, compressible, self-healable somatosensory platform was fabricated by blending Fe³⁺ ions with polyvinyl alcohol acetoacetate (PVAA)/polyacrylamide (PAM) hydrogel to form a double network hydrogel, which combined chemical coordination and physical crosslinking in one system. In this system, the PAM network offered high stretchability and compressibility to the hydrogel. Meanwhile, the coordination of the Fe³⁺/PVAA network provided ionic conductivity and self-healing ability. The resulting hydrogel exhibits prominent stretchability (>700%), high sensitivity, high healing efficiency (80% within 24 h) and excellent fatigue resistance. Therefore, the hydrogel could be used as a potential artificial ionic skin including strain and pressure sensors to directly monitor human motion.

Polymer Chemistry

An autonomously healable, highly stretchable and cyclically compressible, wearable hydrogel as a multimodal sensor†

Abstract

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An autonomously healable, highly stretchable and cyclically compressible, wearable hydrogel as a multimodal sensor

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