Fluorine-19 MAS and1H→19F CP/MAS NMR studies of Viton fluoropolymers

Abstract

Fluorine-19{1H} nuclear magnetic resonance (NMR) at 188.29 MHz, including 1H19F{1H} crosspolarization (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 1H19F{1H} CP/MAS experiments were applied to study the relaxation of the polymers. The results are discussed in terms of the CP dynamics, using parametrized equations. © 1998 John Wiley & Sons, Ltd.