polythioether may be expected to have improved mechanical and thermal properties in embodiments where the b moiety is an ether group a ketone group or a thioether group the b moiety may have the general formula 5 as indicated in the formula 5 a thiol group bonds to the terminal end of the d moiety and the terminal end of the f moiety the e moiety may correspond to the u2014 o u2014 of an ether group the gt c u2550 o of a ketone group or the u2014 s u2014 of a thioether group the d moiety and the f moiety may be alkane or aromatic the alkane groups may be linear branched or cyclic the aromatic group may be an aryl group such as a phenyl group and may be substituted or unsubstituted the ether group ketone group or thioether group may be symmetrical or asymmetrical in symmetrical embodiments the d moiety and the f moiety are identical in asymmetrical embodiments the d and the f moieties are different representative embodiments where b is an ether group a thioether group or a ketone group are shown below in some embodiments a trithiol of the general formula 6 may be used to form the polysulfones the trithiol may be used to form a cross linked polysulfone a crosslinked polysulfone may be more readily fabricated into a film and may have excellent mechanical and thermal properties the i j and k moieties may be any moiety suitable for the b moiety in some embodiments a monothiol of the general formula 7 may also.