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. 2018 Dec 9;10(12):1365. doi: 10.3390/polym10121365

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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 micrographs for the PLA/TiO₂-21-x system observed with the secondary electrons (SE) detector: (a) PLA-0, (b) PLA/TiO₂-21-1, (c) PLA/TiO₂-21-5, (d) PLA/TiO₂-21-10 and (e) PLA/TiO₂-21-20 obtained at different magnifications (left side at 50× and right side at 5000×).