From Wikipedia, the free encyclopedia. Polyphenylsulfone (PPSF or PPSU) is a type of high performance polymer usually consisting of aromatic rings linked by sulfone (SO2) groups. The commercially important polysulfones are prepared by condensation of 4,4'-bis(chlorophenyl)sulfone with various bisphenols. Two bisphenols for this application are bisphenol A (the polymer being called PSF) and 4,4'-bis(4-hydroxyphenyl)sulfone (the polymer being called PES).