Abstract
Herein, we are reporting the interaction of biocompatible polymer polyvinylpyrrolidone (PVP), with gemini, pentamethylene-1,5-bis(hexadecyldimethylammonium bromide) (G5) and TX-114 surfactant mixture. Various thermodynamic parameters are evaluated with the help of regular solution theory (RST) and pseudo-phase separation model. By the addition of PVP, the critical aggregation concentration (cac) value of G5 as well as mixture decreases. A decrease in the cac value mainly credited to the interactions between the polymer and surfactant. The partial negative charged oxygen atoms, present in the amide group of PVP, were believed to be responsible for interaction with cationic head group of gemini surfactant. (C) 2014 Published by Elsevier B.V.