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. 2021 Jan 12;13(2):244. doi: 10.3390/polym13020244

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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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Five representative cross-sections obtained from evenly distributed areas over the entire surface of the films for samples k0 (a), k5 (b) and k10 (c).