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Thermodynamic aspects of polymer–surfactant interactions: Gemini (16-5-16)-PVP-water system
oleh: Naved Azum, Abdullah M. Asiri, Malik Abdul Rub, Abdulrahman O. Al-Youbi, Anish Khan
Format: | Article |
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Diterbitkan: | Elsevier 2016-11-01 |
Deskripsi
The interaction between polyvinylpyrrolidone (PVP) and gemini surfactant (16-5-16) in aqueous solution has been analyzed using conductometry. From conductivity data the critical aggregation concentration (cac), critical micelle concentration (cmc), the effective degree of counter-ion binding (β) at different temperatures were obtained. The thermodynamic parameters, i.e., Gibbs energy of aggregation and micellization, standard enthalpy of aggregation, and standard entropy of aggregation of surfactant/polymer system were estimated, employing pseudophase separation model. The negative values of Gibbs energy and standard enthalpy suggest that the surfactant/polymer aggregation process is spontaneous and exothermic respectively.