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. 2017 May 21;9(5):184. doi: 10.3390/polym9050184

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© 2017 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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ATR-FTIR spectra at the C=O stretching band ranging 1680–1760cm⁻¹ (a), and the N–H stretching band ranging 3200–3450 cm⁻¹ (b): UP2-BUT-0.74 instant was measured soon after production; UP2-BUT-0.74 aged was measured after one month; UP2-BUT-0.74 aged 70 °C was measured after UP2-BUT-0.74 aged was reheated to 70 °C.