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. 2021 Aug 19;13(16):2785. doi: 10.3390/polym13162785

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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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Degradation of films after the third and fourth month: (a) B0 after 3 months, (b) B0 after 4 months, (c) SP after 3 months, (d) SP after 4 months, (e) SW after 3 months, (f) SW after 4 months, (g) B1 after 3 months, (h) B1 after 4 months, (i) B2 after 3 months, (j) B2 after 4 months, (k) Eco after 3 months, (l) Eco after 4 months, (m) K after 3 months, (n) K after 4 months. The figure shows all 7 films only after the third and the fourth month because in most cases after the first and even after the second month no change and decomposition was visually observed.

Degradation of films after the third and fourth month: (a) B0 after 3 months, (b) B0 after 4 months, (c) SP after 3 months, (d) SP after 4 months, (e) SW after 3 months, (f) SW after 4 months, (g) B1 after 3 months, (h) B1 after 4 months, (i) B2 after 3 months, (j) B2 after 4 months, (k) Eco after 3 months, (l) Eco after 4 months, (m) K after 3 months, (n) K after 4 months. The figure shows all 7 films only after the third and the fourth month because in most cases after the first and even after the second month no change and decomposition was visually observed.