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. 2022 Feb 16;27(4):1339. doi: 10.3390/molecules27041339

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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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(A) DSC curves of glycerol-plasticized silk films with various glycerol contents. The samples were heated from 0 to 250 °C with a heating rate of 10 °C/min. (B) The second scan DSC curves of glycerol-plasticized silk films with various glycerol contents. The first heating scan was from 20 to 200 °C with a heating rate of 20 °C/min for removing free water in the films and the second heating scan was from −30 to 220 °C with a heating rate of 20 °C/min. (C) Glass transition temperatures of glycerol-plasticized silk films with various glycerol contents.