Plasma polymerization of fluorobenzenes/SO₂ mixtures

Summary

Plasma polymerization of mixtures of fluorobenzenes (perfluorobenzene (PFB), pentafluorobenzene (PnFB), and tetrafluorobenzene (TFB)) and sulfur dioxide (SO₂) is carried out for preparation of plasma polymers containing both fluorine and sulfur moieties. The chemical composition of the polymers is inspected by FT/IR and XPS, and the ion-exchange capacity and the electrical conductivity are measured. Plasma polymers prepared from these mixtures are fluro polymers with either of sulfonic acid or sulfinic acid groups. The ion-exchange capacity is 0.49 (for polymers from the PFB/SO₂ mixture), 0.94 (for those from the PnFB/SO₂ mixture), and 1.31 meq/g-polyer (for those from the TFB/SO₂ mixture). The electrical conductivity at a relative humidity of 70 %RH is 8.3 × 10⁻⁹, 3.6 × 10⁻⁷, and 4.3 × 10⁻⁵ S/cm, respectively.