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. 2020 Jan 3;12(1):81. doi: 10.3390/polym12010081

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© 2020 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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Schematic representation of the structure mechanism of PVA/HEC/lignin hydrogels with valuable self-healing properties Reproduced with permission from Huang et al. [37] Copyright © (2019) Elsevier.