13C NMR relaxation of iso-poly(2-vinylpyridinium chloride) in aqueous solution. Effects of electrostatic interactions on local chain dynamics

Shinichi Yamazaki, Eisaku Okada, Yoshio Muroga, Ichiro Noda, Akihiro Tsutsumi

Research output: Contribution to journalArticle

3 Citations (Scopus)

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-Laupretre-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-P2VPCl 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.

Original languageEnglish
Pages (from-to)614-620
Number of pages7
JournalPolymer Journal
Volume31
Issue number7
DOIs
Publication statusPublished - Dec 1 1999
Externally publishedYes

ASJC Scopus subject areas

  • Polymers and Plastics
  • Materials Chemistry

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