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. 2021 Mar 29;13(7):1073. doi: 10.3390/polym13071073

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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 (http://creativecommons.org/licenses/by/4.0/).

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SEM microphotographs of composite cryogels: (A,B) composites PVA-CHI-hydroxyapatite-heparin-GA; scale bar 100; (C) polyelectrolyte complex PVA-CHI-heparin-GA scale bar 20 [35] and (D) CHI-GA; scale bar 100 [44].