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. 2021 Apr 2;13(7):1133. doi: 10.3390/polym13071133

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Resistance–strain cyclic test of different Alg-BA/OEGCG/NaCl conductive hydrogels to analyze the electrical-mechanical characterizations. (a,b) Illustration and photograph of resistance–strain test with automatic stretch-testing machine (LCR (Inductance/Capacitance/Resistance) meter). Alg-BA/OEGCG/NaCl was lusterless and rigid (b, (iii) and (iv)) compared with Alg-BA/OEGCG (b, (i) and (ii)) and only strained near 300%. (c,d) Resistance–strain cycle tests (10 cycles) from 0 to 100% (c) and strain increased strains (50% per time) from 50 to 500% (d). (e) Strain–normalized conductivity and resistance continuous strain to each conductive hydrogel—without NaCl (left), NaCl (1%) (middle), and NaCl (2%) (right). Each cyclic loading/unloading was performed continuously.