Nuclear magnetic resonance spectra of some fluorine‐containing polymers

Abstract

AbstractHigh resolution nuclear magnetic resonance spectra have been measured for the F19 resonance in some fluorine‐containing polymers. These data have shown that the F19 resonance frequency depends on the electronegativity of the other substituents on the carbon atom, in a manner similar to that found for small molecules. The resonance frequency also is dependent on substituents attached to adjacent carbons in a way not easily explained by inductive effects. It is hypothesized that these latter shifts may be due to direct potential interaction. The above generalizations, together with other supporting evidence, were utilized to assign a small peak in the spectrum of polyvinylidene fluoride to a head‐to‐head structure. This structure is present to the extent of 8–10%.