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(a) MALDI-TOF mass spectra and (b) 1H NMR spectra with proton assignation for a typical RP (bottom) after incomplete urethane group degradation and the corresponding virgin polyol VP5611 (top). The measured monoisotopic masses of four peak populations in the MALDI-TOF mass spectrum of RP are in good agreement with the theoretical monoisotopic masses given under the proposed structures with the corresponding degrees of polymerization (DPn).
