Open Access

ARTICLE

Strong and Tough PAm/SA Hydrogel with Highly Strain Sensitivity

by Lingqin Zhang, Qifeng Jiang, Yiming Zhao, Jie Yuan, Xiaoying Zha, Haojiang Xie, Fankai Kong, Xingliang Xiong^*

Department of Medical Information College, Chongqing Medical University, Chongqing, 400016, China

* Corresponding Author: Xingliang Xiong. Email:

(This article belongs to the Special Issue: Biomass-Derived Functional Hydrogels)

Journal of Renewable Materials 2022, 10(2), 415-430. https://doi.org/10.32604/jrm.2022.016650

Received 15 March 2021; Accepted 10 May 2021; Issue published 30 August 2021

Abstract

The hydrogel is a preferred material for flexible wearable sensors. In practical application, it should have high-efficiency mechanical toughness and self-healing performance. Besides, hydrogel requires good affinity and adhesion because of its contact with the skin. In this experiment, we made an ultra-tough hydrogel with excellent cell affinity and adhesion. We used sodium alginate (SA) and polyacrylamide (PAm) mixture as a flexible base fluid. Polydopamine reduce graphene oxide (prGO) was used as conductive nanofiller, and then PAm-prGO-SA semi-interpenetrating network hydrogel was formed through Am radical polymerization. The presence of prGO endows the hydrogels with excellent electrical conductivity. Simultaneously, some non-reduced GO forms non-covalent cross-links with PAm, SA, and Polydopamine (PDA) in the hydrogel network. The stress of PAm-prGO-SA hydrogel can reach 750 KPa, and the strain is 900%. The hydrogel, combined with its excellent electrical, mechanical properties, and biocompatibility, is expected to be applied in portable, remote, and real-time health monitoring systems.

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