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. 2021 Mar 7;14(5):1261. doi: 10.3390/ma14051261

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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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FTIR results of PBT-GF30 after aging in water at 80, 85, and 90 °C, showing chemical changes in the region related to OH $^{-}$ appearing between 80 and 85 °C.