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. 2021 Jan 28;13(3):417. doi: 10.3390/polym13030417

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

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Atomic force microscope (AFM) phase images showing the layer morphology in multilayer films with a varying number of layers for (a–c) nylon/ethylene vinyl alcohol (44 mol% ethylene) (EVOH44) multilayers and (d–f) nylon/24 mol% ethylene (EVOH24) multilayers. (a,d) It shows 17 layers with nominal layer thickness of 3.2 µm; (b,e) 129 layers with nominal layer thickness of 400 nm; and (c,f) 1025 layers with nominal layer thickness of 50 nm. Reproduced with permission from Ref. [40]. Copyright (2016) Elsevier.