THERMORESPONSIVE VISCOELASTICITY OF SODIUM 1-[4-(TRIDECAFLUOROHEXYL)PHENYL]-2-HEXANESULFONATE AQUEOUS-SOLUTIONS

The thermal viscosity behavior or temperature-dependent viscosity of a n aqueous solution of sodium 1-[4-(tridecafluorohexyl)phenyl]-2-hexane sulfonate (FC6-HC4), a fluoro-hybrid type surfactant, which has a fluo rocarbon chain and a hydrocarbon chain in a molecule, was examined. Th e FC6-HC4 solution showed viscoelastic behavior at concentrations arou nd 10 wt %. Further study on the temperature dependence of the viscosi ty of a 10 wt % solution revealed that the viscosity increased about 1 0(2) times, showing a maximum as temperature rose from 6 to 36 degrees C, and then decreased about 10(-4) times with further rising at in te mperatures up to 64 degrees C. Moreover, tan delta, a parameter for vi scoelasticity, exhibited a minimum at 36 degrees C. The phenomenon fou nd in this work was reversible with respect to temperature change. In other words, an aqueous solution of FC6-HC4 was found to show thermore sponsive viscoelastic behavior.