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    Interaction of triblock-copolymer with cationic gemini and conventional surfactants: A physicochemical study

    Year: 2017

    Journal: J. Dispersion Sci. Technol., Volume 38, page 1785–1791

    Authors: Azum, Naved; Rub, Malik Abdul; Asiri, Abdullah M.

    Organizations: Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, Jeddah [CEAMR-SG-5-438]

    Keywords: Gemini surfactant; mixed micelle; Pluronic F-68; surfactant-polymer interactions

    In the current work, we have examined the interaction activities of Pluronic F-68 with cationic conventional, cetyltrimethylammonium bromide (CTAB), and gemini surfactant, pentanediyl-1, 5-bis(dimethylcetylammonium bromide), (16-5-16) by means of surface tension and conductivity measurements. The critical micelle concentration (cmc) values of pure 16-5-16 and CTAB have been evaluated tensiometrically and conductometrically, while the cmc values of pure F-68 and binary mixtures were determined only from the surface tension plots. Various interfacial and micellar parameters including surface excess concentration ((max)), minimum area per molecule (A(min)), surface pressure at cmc ((cmc)), packing parameter (p), and interaction parameter () have been estimated and discussed in detail. Various thermodynamic parameters including Gibbs free energy of micellization (), standard free energy of adsorption at the air-water interface (), excess free energy of micellization (Delta G(ex)), and molar free energy at the maximum adsorption achieved at cmc (G(min)) have been calculated. [GRAPHICS] .
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