Abstract
Measurements of 13C spin-lattice relaxation times, T1, and nuclear Overhauser effects, NOE, were carried out as a function of temperature at two magnetic fields for iso-poly(2-vinylpyridine) (iso-P2VP) in 1,4-dioxane-d8 and iso-poly(2-vinylpyridinium chloride) (iso-P2VPCl), in D2O to investigate the effects of electrostatic interactions on local chain dynamics. For main chain carbons of both polymers, the experimental T1 and NOE data are in good agreement with the Dejean-LauprĂȘtre-Monnerie (DLM) model in the entire temperature range. It was found that the local conformational transitions of main chain and the libration are more restricted for iso-P2VPCI than iso-P2VP. For pyridyl ring carbons, the experimental data were reproduced by the models combining the DLM model and restricted ring rotations. The angular amplitude α of ring rotation of iso-P2VPCl is smaller than that of iso-P2VP. These results imply that both local motions of main chain and side chain are affected by the electrostatic interactions.
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Yamazaki, S., Okada, E., Muroga, Y. et al. 13C NMR Relaxation of iso-Poly(2-vinylpyridinium chloride) in Aqueous Solution. Effects of Electrostatic Interactions on Local Chain Dynamics. Polym J 31, 614â620 (1999). https://doi.org/10.1295/polymj.31.614
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DOI: https://doi.org/10.1295/polymj.31.614