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. 2021 Sep 16;13(18):3130. doi: 10.3390/polym13183130

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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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Adhesive and cohesive properties of chemical oxidants-induced hydrogels. (a) Catechol forms di-catechol covalent bonds owing to APS, NaIO₄, NaOH. (b) UV-vis spectra of chemical crosslinking-induced HA–Ca solutions by three different oxidants. Frequency sweep-storage (G′) and loss (G″) moduli of HA–Ca hydrogels at 1% strain, oxidized with (c) NaOH, (d) NaIO₄, and (e) APS with different molar ratios of catechol and the oxidant. (f) Images of NaOH-induced hydrogel with different pH (scale bar = 5 mm). Adhesion strength of various oxidants-induced HA–Ca hydrogels on PET substrate in (g) different Ca:APS molar ratio and (h) different Ca:NaIO₄ molar ratio (n = 5, mean ± SD) (**** p < 0.0001, ns = not significant).