Abstract
UV and IR absorption spectra of poly(itaconic acid) (PIA) were measured on salt-containing aqueous solutions of various degree of neutralizations (a), to confirm the existence of intramolecular hydrogen bonds between ionized and un-ionized carboxyl groups. Two kinds of isosbestic points were observed in UV spectra at λ=218 nm and λ=213 nm in the region of a≤0.5 and a≥0.5, respectively. A stretching vibration frequency of C=O of un-ionized carboxyl groups and an asymmetric stretching vibration frequency of COO− shifted to lower wavenumbers by 20 cm−1 and by 8 cm−1, respectively, with increasing a above 0.5. Peak separations for the IR spectra were successfully carried out over a whole a, by assuming four species, free COOH, free COO−, hydrogen-bonded COOH, and hydrogen-bonded COO−. It was concluded that PIA forms an ionic intramolecular hydrogen bond between α- and β-carboxyl groups in a single monomeric unit during neutralization. The strength and extent of hydrogen bonds were compared with those of the polyelectrolytes having maleic acid units reported previously. The anti- and gauche-staggered conformers in the monomeric unit of PIA at a=0.5 could be determined to be 16±2% and 84=2%, respectively.
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Kawaguchi, S., Kamata, M. & Ito, K. Infrared and Ultraviolet Spectroscopic Studies on Intramolecular Hydrogen Bonding of Poly(itaconic acid). Polym J 24, 1229–1238 (1992). https://doi.org/10.1295/polymj.24.1229
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DOI: https://doi.org/10.1295/polymj.24.1229
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