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Triple-Channel Solid-State NMR Investigation of Poly(vinylidene fluoride) Polymorphs

✍ Scribed by Peter Holstein; Ulrich Scheler; Robin K. Harris

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
235 KB
Volume
35
Category
Article
ISSN
0749-1581

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✦ Synopsis

Triple-channel solid-state NMR investigations of two di †erent poly(vinylidene Γ‘uoride) (PVDF) materials are described. Carbon-13 cross-polarization magic angle spinning NMR spectra were recorded using simultaneous high-power decoupling on both the proton and Γ‘uorine channels. Both 1H to 13C and 19F to 13C cross-polarization experiments were applied, giving identical results apart from intensity variations due to the cross-polarization efficiency. An attempt was made to characterize the polymorphism of PVDF by means of solid-state tripleresonance spectroscopy. Two principal signals, for the and the groups, were observed, for both the CF 2 CH 2 non-polar a-phase and the polar b-phase. There was a small di †erence (ca. 4 ppm) in the chemical shift positions for these distinct crystalline modiÐcations.

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