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. 2022 Jul 12;14(14):2832. doi: 10.3390/polym14142832

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© 2022 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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Fick and two-step (Dual) diffusion curves, positions of $M_{s a t}$ , $t_{s a t}$ , $M_{i n t e r}$ and $t_{i n t e r}$ .