Chemistry Faculty Research

Title

Ultrafast Magic Angle Spinning F-19 NMR Study of the Bisphenol-AF Cure of Poly(Vinylidene Fluoride-Co-Hexafluoropropylene)

Document Type

Conference Proceeding

Publication Date

Spring 3-16-2014

Abstract

Ultrafast magic angle spinning (UF-MAS, 60 kHz) solid-state 19F NMR methods at 706 MHz have been used to characterize cross-linking structures in a copolymer of vinylidene fluoride (VDF) and hexafluoropropylene (HFP) and its curing with bisphenol-AF. Assignment of 19F resonances for the monomer and inverted monomer sequences were identified for various stages of the curing process. Additional CF3 and CF2 resonances after cross-linking corroborate the presence of previously reported cross-linking structures. Measurement of T1 and T1ρrelaxation times confirmed the formation of fluorine ion in the form of CaF2 during press and post cure. The data suggests rapid cross-linking occurs during the short press cure and continues at a reduced rate over the longer post cure- resulting in increased rigidity.

Publication Title

Abstracts of Papers of the American Chemical Society

Volume

247

Issue

297-poly