The interaction of ester functionalized amide gemini surfactants with polymers

Abstract

Abstract In this study the interaction between the esterified amide gemini surfactant C 12 -(BAE)-C 12 , where BAE stands for the bis(acetoxy)ethane linking group, and the non-ionic polymer polyvinylpyrrolidone (PVP) was investigated by the surface tension method. It was found that there was no apparent interaction between them. The interaction between C 12 -(BAE)-C 12 and sodium polyelectrolyte polyacrylate (NaPAA) was investigated by surface tension, micropolarity and turbidity measurements. The results showed that there was a strong interaction between them. The aggregates were formed by electrostatic attraction between the molecules of C 12 -(BAE)-C 12 and NaPAA in the bulk. This process led to the appearance of two inflection points, the critical aggregation concentration ( cac ) and the critical micelle concentration (CMC), on the surface tension and micropolarity curves. In addition, the inorganic salt NaBr had two opposite effects, promoting or inhibiting the interaction between C 12 -(BAE)-C 12 and NaPAA. This was related to the concentration of NaBr itself.