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. 2020 Sep 28;10(10):264. doi: 10.3390/membranes10100264

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© 2020 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 of the membrane cross-section, enlarged fragment of the cross-section, skin layer and surface of the skin layer, coagulation bath, T = 25 °C, PASA concentration in the coagulant, wt %: (a) 0; (b) 0.1; (c) 0.3.

SEM micrographs of the membrane cross-section, enlarged fragment of the cross-section, skin layer and surface of the skin layer, coagulation bath, T = 25 °C, PASA concentration in the coagulant, wt %: (a) 0; (b) 0.1; (c) 0.3.