Using PVP-SDS Complex as a Probe to Study the Effect of n-Butanol on Micellization Behavior of SDS
PVP[poly(vinyl pyrrolidone)]/SDS(sodium dodecyl sulfate) complex was applied as a probe to study the effect of n-butanol on micellization behavior of SDS. It has been found that a critical concentration, namely cs, exists in the relative viscosity versus n-butanol concentration plot. As the n-butanol concentration is less than cs, the relative viscosity of solution containing PVP/SDS complex increased by adding n-butanol into solution successively. On the other hand, as the n-butanol concentration is greater than cs, the relative viscosity of solution containing PVP/SDS complex decreased by adding n-butanol into solution. The increase and the decrease of the relative viscosity of solution containing PVP/SDS complex in the presence of n-butanol is just due to the cosurfactant and the cosolvent effect on micellization behavior of SDS in aqueous solution. Further experimental results indicate that cs is dependent on SDS concentration.