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Characteristics of PVA-HEDP hydrogels. (a) FTIR spectra for the pure PVA gel and the PVA-HEDP gel. (b) XRD spectra for the pure PVA gel and the PVA-HEDP gel. (c) Stress–strain curves of the hydrogels with various HEDP contents. (d) Compressive stress–strain curves of the hydrogels with various HEDP contents. (e,f) Comparison of electrical and mechanical properties with previous research work [18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33].
