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. 2019 Jan 4;11(1):66. doi: 10.3390/polym11010066

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© 2019 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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Optical microscopy images of the PLA/cellulose composite films: (a) PLA/UP; (b) PLA/GUP; (c) PLA/GUP-L61; (d) PLA/MCC; (e) PLA/MCC-L61 (see Table 1 for sample identification).