Abstract
The micellization behaviour of sodium dodecyl sulphate, sodium dodecylbenzenesulfonate, hexadecyltrimethylammonium bromide, tetradecyltrimethylammonium bromide, and cetylpyridinium chloride in water and in aqueous solutions of polyethylene oxide (PEO, molecular weight = 100,000) having concentrations (0.005–0.04 %, w/v) has been studied at different temperatures (288.15–318.15 K) using conductivity, surface tension, and viscosity methods. From conductivity measurements various micellar parameters, like critical micellar concentration (CMC), critical aggregation concentration (CAC), polymer saturation point (PSP), degree of ionization (β), and standard free energy of transfer (\( \Delta G_{t}^{0} \)), have been calculated. CAC values have been found to decrease with polymer concentration and increase with temperature. However, the PSP values increase with both polymer concentration and temperature for all surfactants. Similar parameters have also been calculated from surface tension data (CMCσ, CACσ, PSPσ) along with other parameters such as maximum surface excess concentration at the air/water interface (\( \Gamma_{\hbox{max} } \)), minimum area per molecule (A min), and packing parameter (p). The CMCσ, CACσ, and PSPσ values are smaller than the corresponding CMC, CAC, and PSP values, but both show similar behaviour with temperature and concentration of polymer. Various parameters indicate that the presence of the aromatic ring in the head group of surfactant decreases its interaction with PEO, whereas the increased hydrophobicity in the tail leads to stronger interactions with PEO. Viscosity studies further supplement the conclusions drawn from the above results.
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Acknowledgments
Harjinder Kaur thanks the University Grants Commission (UGC), India for the award of JRF (Junior Research Fellowship).
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Banipal, T.S., Kaur, H., Banipal, P.K. et al. Effect of Head Groups, Temperature, and Polymer Concentration on Surfactant—Polymer Interactions. J Surfact Deterg 17, 1181–1191 (2014). https://doi.org/10.1007/s11743-014-1633-y
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DOI: https://doi.org/10.1007/s11743-014-1633-y