Preparation and Characterization of Fluorine-containing Aromatic Condensation Polymers VIII. Aromatic Polyether and Copolyethers from 2,2-Bis(4-hydroxyphenyl)-1,1,1,3,3,3-hexafluoropropane, 2,2-Bis(4-hydroxyphenyl)propane, or both and Bis(4-fluorophenyl)phenylphosphine Oxide