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. 2022 Jan 11;10(3):1323–1332. doi: 10.1021/acssuschemeng.1c07911

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© 2022 The Authors. Published by American Chemical Society

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(A) ¹H NMR spectra and (B) MALDI-TOF mass spectra of purified RPs recovered from PUF at 220 °C, 30 min with 1.1 (black), 2.0 (red), and 3.0 (blue) equivalents of AA per urethane group. ¹H NMR spectra representing the magnified region between 4.75 and 5.03 ppm were recorded in DMSO-d₆ with added TFA and are normalized to the polyol methyl group. Traces of EtOAc used as the extraction solvent and partially amidated 2,4-TDA in the RPs are indicated by asterisk and h′, respectively.