Fully Physically Crosslinked Conductive Hydrogel with Ultrastretchability, Transparency, and Self-Healing Properties for Strain Sensors

Author:

Ji Feng1,Shang Pengbo2,Lai Yingkai1,Wang Jinmei3,Zhang Guangcai1,Lin Dengchao1,Xu Jing1,Cai Daniu1,Qin Zhihui4

Affiliation:

1. College of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou 362000, China

2. College of Materials Science and Engineering, Fuzhou University, Fuzhou 350116, China

3. Shenzhen Institute for Drug Control, Shenzhen 518057, China

4. State Key Laboratory of Metastable Materials Science and Technology, School of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, China

Abstract

Currently, conductive hydrogels have received great attention as flexible strain sensors. However, the preparation of such sensors with integrated stretchability, transparency, and self-healing properties into one gel through a simple method still remains a huge challenge. Here, a fully physically crosslinked double network hydrogel was developed based on poly(hydroxyethyl acrylamide) (PHEAA) and κ-carrageenan (Car). The driving forces for physical gelation were hydrogen bonds, ion bonding, and electrostatic interactions. The resultant PHEAA-Car hydrogel displayed stretchability (1145%) and optical transparency (92%). Meanwhile, the PHEAA-Car hydrogel exhibited a self-healing property at 25 °C. Additionally, the PHEAA-Car hydrogel-based strain sensor could monitor different joint movements. Based on the above functions, the PHEAA-Car hydrogel can be applied in flexible strain sensors.

Funder

Natural Science Foundation of the province of Fujian

Quanzhou Science and Technology Program

Scientific Research Foundation of Quanzhou Normal University

College Student Innovation and Entrepreneurship Training Program

Publisher

MDPI AG

Subject

General Materials Science

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