INFLUENCE OF PEG-4000 ON THE MICELLIZATION BEHAVIOR OF SDBS AND CPC AT DIFFERENT TEMPERATURES
Keywords:
Micellization, Polymer, SurfactantAbstract
Objective: The main objective of this research work was to gain a qualitative understanding of polymer-surfactant interactions by comparing the micellar properties of anionic (SDBS) and cationic (CPC) surfactants in aqueous mixtures of PEG-4000.
Methods: Conductivity method was employed to investigate the micellization behavior of two oppositely charged ionic surfactants in polymer solutions at a temperature range between 298.15 K to 308.15K. Thermodynamic parameters of micellization were also derived (∆G °m, ∆H °m and ∆S °m) to support the findings.
Results: CMC of both the surfactants was directly proportional to the concentration of PEG-4000. Negative values of ∆G °m suggested that the micellization was a spontaneous process, but these values were inversely proportional to PEG concentration suggesting the origin of London dispersion interactions on increasing polymer concentration in the system.
Conclusion: Comparative study of polymer–surfactant interactions enabled us to evaluate the relative contribution of electrostatic and hydrophobic interactions between surfactant and polymer molecules. Studies showed that the micellization is more favored by CPC-PEG system as compared to SDBS-PEG system.
Keywords: Micellization, Polymer, Surfactant
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