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. 2022 Sep 7;14(18):3739. doi: 10.3390/polym14183739

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© 2022 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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(a) Interpenetrating polymer network of lignin and crosslinking monomer. (b) Copolymerization of lignin and the crosslinking agent. (c) Copolymerization of grafted lignin and crosslinking monomer.