Microstructure analysis of poly(vinyl fluoride) by fluorine- 19 two-dimensional J-correlated NMR spectroscopy.

Fluorine-19 NMR spectroscopy is a powerful method for studying the microstructure of fluoropolymers since F-19 chemical shifts are highly sensitive to structural variables. Different stereosequences have markedly different chemical shifts, and fluorines involved in head-to-head:tail-to- tail monomer inversions have significantly different chemical shifts from those of normal head-to-tail units. Complete stereosequence assignments have been made at the pentad level for isoregic poly(vinyl fluoride) from the 188 MHz F-19 J-correlated spectrum.