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Published on: April 7, 2017
Self-healing, sensitive and antifreezing biomass nanocomposite hydrogels based on hydroxypropyl guar gum and
Zhixiang Sun1, Lulu Wang1, Xinyan Jiang1
1School of Chemistry and Materials Science, Ludong University, Key Laboratory of High Performance and Functional Polymer in the Universities of Shandong Province, Collaborative Innovation Center of Shandong Province for High Performance Fibers and Their Composites, Yantai, China.
Abstract:
In this manuscript, self-healing, highly flexible hydrogels based on hydroxypropyl guar gum (HPG) were prepared by adding dopamine-coated reduced-graphene oxide (rGO@PDA). The multiple reversible dynamic networks were simultaneously constructed by boron-oxygen and metal-ligand interactions. These multiple networks significantly improve the self-healing efficiency and mechanical strength of the biomass hydrogels. It is noteworthy that rGO@PDA can enhance conductivity and flexibility properties. Impressively, flexible sensor with these self-healing hydrogels have a large strain range (728%), high sensitivity (GF = 11.30) and fast response time (210 ms). The obtained flexible sensors can also detect human motion (such as sound vibrations and pulse rates) to large scales (such as knee flexion) over a wide temperature range (-20-30 °C). The signals of sensors have superior stability and repeatability, which show potential application prospect in the field of flexible wearable devices.
