F-19-NMR AND H-1-NMR SPECTRA OF TETRAFLUOROETHYLENE-PROPYLENE COPOLYMERS

In the reported experiments, high resolution 94-MHz **1**9F- and 100-MHz **1H-NMR spectra were measured on a series of tetrafluoroethylene (TFE)-propylene (P) copolymers having a range of composition (TFE/P molar ratio equals 37/63-55/45) and polymerized at different temperatures ( minus 23, 25, and 65 degree C). The spectra were analyzed in relation to copolymer compositions. The spectra interpreted revealed the sequence distribution of the copolymers. Copolymer compositions calculated from NMR spectra and elemental analysis agreed rather well with each other. Monomer reactivity ratios were calculated from the sequence distributions and compared with those obtained from the elemental analysis. It was observed that highly alternating copolymers are obtained in this system over a wide range of monomer composition at lower temperatures and that a deviation from alternancy increases slightly with rising polymerization temperature.