High-resolution 19F and 1H NMR of a vinylidenefluoride telomer

Philip Wormald (1) , Bruno Ameduri (2) , Robin Harris (3) , P. Hazendonk (4)

1 School of Chemistry [University of St Andrews]
2 ICGM ICMMM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
3 Department of Chemistry, University Science Laboratories
4 Department of Chemistry and Biochemistry

The reaction products of vinylidenefluoride (VDF) with methanol as a telogen have been analysed in the solution state by 1H and 19F nuclear magnetic resonance (NMR) spectroscopy. High-resolution 19F and 1H NMR spectra were achieved using high-power 1H and 19F decoupling, respectively, giving superior resolution and revealing previously unresolved signals of the vinylidenefluoride telomer (VDFT). 1H and 19F homo- and hetero-nuclear scalar coupling constants are presented and the spectra of functional groups and reverse units (including the identification of short-chain structures) are discussed. Furthermore, the application of 19F or 1H decoupling for the correct assessment of reverse-unit content and degree of polymerisation is demonstrated. This work highlights the need for high-resolution NMR spectroscopy to determine both the chemical structure and the composition of these important fluoropolymers.

Mots clés: 19F and 1H NMR; Correlation spectroscopy; Vinylidene fluoride

Domaines: Polymères

Philip Wormald, Bruno Ameduri, Robin Harris, P. Hazendonk. High-resolution 19F and 1H NMR of a vinylidenefluoride telomer. Polymer, 2008, 49, pp.3629-3638. ⟨10.1016/j.polymer.2008.06.043⟩. ⟨hal-00320274⟩