Micellization and Adsorption Parameters of Poly(Propylene Oxide)/Poly(Ethylene Glycol) Block and Graft Copolymers in Aqueous Medium |
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| Authors: | Ayman M Atta H S Ismail A M Elsaaed R Fouad A A Fada A A-H Abdel-Rahman |
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| Institution: | 1. Surfactant Research Chair, Chemistry Department , College of Science, King Saud University , Riyadh , Saudi Arabia;2. Petroleum Application Department , Egyptian Petroleum Research Institute , Nasr City , Cairo , Egypt aatta@ksu.edu.sa;4. Petroleum Application Department , Egyptian Petroleum Research Institute , Nasr City , Cairo , Egypt;5. Department of Chemistry, Faculty of Science , Mansoura University , Mansoura , Egypt;6. Department of Chemistry, Faculty of Science , Menoufia University , Shebin El-koum , Egypt |
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| Abstract: | This work aims to measure the adsorption and micellization parameters of new water soluble nonionic amphiphilic block and graft copolymers based on hydrophilic poly (ethylene glycol) (PEG) and hydrophobic poly (propylene oxide) (PPO) at ambient temperature and normal atmospheric pressure. The chemical composition and molecular weights of the prepared copolymers were determined from 1H NMR analyses. The surface properties of the prepared surfactants were determined by measuring the surface tension at different temperatures. The surface tension, critical micelle concentration, and surface activities were determined at different temperatures. Surface parameters such as surface excess concentration, the area per molecule at interface and the effectiveness of surface tension reduction were determined from the adsorption isotherms of the prepared surfactants. Some thermodynamic data for the adsorption and micellization process were calculated and are discussed. |
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| Keywords: | Adsorption amphiphile graft and block copolymer micellization polyethylene glycol polypropylene glycol surface tension |
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