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. 2021 Aug 18;13(16):2776. doi: 10.3390/polym13162776

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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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Images obtained under cross-polarization conditions for the (a) raw PLLA fiber, (b) electrospun PLLA web (14 W), and (c) electrospun BC/PLLA web (16 W); images acquired under cross-polarization conditions using the Bereck compensator without optical retardation for the (d) raw PLLA fiber, (e) electrospun PLLA web (14 W), and (f) electrospun BC/PLLA web (16 W); and images achieved under cross-polarization conditions with the Bereck compensator and optical retardation for the (g) raw PLLA fiber, (h) electrospun PLLA web (14 W), and (i) electrospun BC/PLLA web (16 W).