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. 2021 Jun 17;13(12):1982. doi: 10.3390/polym13121982

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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 (https://creativecommons.org/licenses/by/4.0/).

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SEM images of (a) raw PLA filament (×1000), (b) PLA filament under scCO₂ at 75 °C and 250 bar (×2400), (c) PLA filament impregnated with ketoprofen at 35 °C and 100 bar (×10,000), and (d) PLA filament impregnated with ketoprofen at 75 °C and 250 bar (×20,000). All are transversal sections of the polymer filaments.