Fluorine-19 MAS 1H 19F CP/MAS NMR study of Viton Fluoropolymers

G. A. MONTI; ROBIN K, HARRIS

MAGNETIC RESONANCE IN CHEMISTRY

John Wiley and Sons, Ltd.

Año: 1998 vol. 36 p. 892 - 900

0749-1581

Fluorine-19{1H}nuclear magnetic resonance (NMR) at 188.29 MHz, including 1H-19F{1H}cross-polarization (CP) with high-speed magic-angle spinning (MAS), was used to study some fluoropolymers of the VITON type. The systems examined were (a) copolymers of vinylidene fluoride and hexafluoropropene and (b) terpolymers of vinylidene fluoride, tetrafluoroethene and hexafluoropropene. Both commercial and specially prepared samples were used. Different 1H-19F{1H} CP/MAS experiments were applide to study the relaxation of the polymers. The results are discussed in terms of the CP dynamics, using parametrized equations.