4,4′-Difluorodiphenyl sulfone-4,4′-dihydroxydiphenyl sulfone copolymer 4,4′-Difluorodiphenyl sulfone-bis(4-hydroxyphenyl) sulfone copolymer Benzene, 1,1′-sulfonylbis[4-fluoro-, polymer with 4,4′-sulfonylbis[phenol] Bis(4-fluorophenyl) sulfone-bis(4-hydroxyphenyl)sulfone copolymer Bis(4-hydroxyphenyl) sulfone-bis(4-fluorophenyl) sulfone copolymer Bis(p-fluorophenyl) sulfone-4,4′-sulfonyldiphenol copolymer Bisphenol S-4,4′-difluorodiphenyl sulfone copolymer Phenol, 4,4′-sulfonylbis-, polymer with 1,1′-sulfonylbis[4-fluorobenzene]