Determination of molar ratio of primary secondary and tertiary amines in polymers by applying derivatization and NMR spectroscopy |
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| Institution: | 1. Department of Biomedical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, 50603, Malaysia;2. Center for Innovation in Medical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, 50603, Malaysia;3. Faculty of Health, Medicine and Life Sciences, Maastricht University, Netherlands;1. Dipartimento di Ingegneria Meccanica e Industriale, Università degli Studi di Brescia, Via Branze 38, 25123 Brescia, Italy;2. Istituto per lo Studio delle Macromolecole, Consiglio Nazionale delle Ricerche, Via De Marini 6, 16149 Genova, Italy;1. Department of Chemical Engineering, Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates;2. Center for Catalysis and Separations (CeCaS), Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates;3. Research and Innovation Center on CO2 and H2 (RICH), Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates |
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| Abstract: | A trifluoroacetic acid derivatization combined with 1H NMR spectroscopy method for determining the molar ratio of primary, secondary, and tertiary amines in small molecules and polymers was discussed. Amines reacted with trifluoroacetic acid to form their salts RNH3+, R2NH2+, and R3NH+. The 1H NMR signals of these protonated amines (NH3+, NH2+, and NH+) were separated well in the spectra. Based on the integration of these protonated amine signals, the molar ratio of primary, secondary, and tertiary amines can be calculated. |
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| Keywords: | Amine Trifluoroacetic acid NMR Molar ratio |
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