The interaction of ester functionalized amide gemini surfactants with polymers

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.