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. 2018 Aug 6;10(8):876. doi: 10.3390/polym10080876

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© 2018 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 images of char residue after cone calorimeter test: (A1,A2) the outer surface and the inner surface of PLA/IFR; and (B1,B2) the outer and inner surface of PLA/IFR/α-ZrP2 (Adapted with permission from [81].