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. 2020 Jan 31;13(3):627. doi: 10.3390/ma13030627

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© 2020 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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(a) ATR-IR spectra of the PUUs made with amino-alcohol chain extenders. (b) Carbonyl region (1600–1800 cm⁻¹) of the ATR-IR spectra of the PUUs made with amino-alcohol chain extenders.

(a) ATR-IR spectra of the PUUs made with amino-alcohol chain extenders. (b) Carbonyl region (1600–1800 cm⁻¹) of the ATR-IR spectra of the PUUs made with amino-alcohol chain extenders.