Surface active substances containing an oligo(hexafluoropropene oxide) chain as a hydrophobic and oleophobic moiety

Oil soluble surface active substances,(HFPO)_n-Ar, where Ar is an aryl group and (HFPO)_n is an oligo(hexafluoropropene oxide) group, n = 2 ? 5, were prepared and tested for their surface activities in toluene or $\text{m}$-xylene. Addition of a small amount of (HFPO)_4–6-Ar (0.2–0.5 wt%) was found to decrease remarkably the surface tension of these solvents (down to 12–14 dyn·cm_?1 at 20 °C). Water soluble surfactants (HFPO)_n-Ar′SO₃Na, where Ar′ is an arylene group, were also prepared by sulfonation of (HFPO)_n-Ar. Some of these substances (n = 4 ? 6) decreased the surface tension of water down to 16 dyn·cm^?1 at 20 °C in the concentration of 1O^?4–1O^?5 mole·1^?1.