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Peshāwar, Pakistan

Hazrat A.,Gomal University | Azim K.,Gomal University | Irfan U.,Gomal University | Gulrez F.D.,Gomal University | And 4 more authors.
Asian Journal of Chemistry

Ionic surfactant such as sodium dodecylsulfale (SDS) and N-cety1 N.N.N-trimethyl ammonium bromide (CTAB) has been tensiometically and conductometrically studied in the presence and absence of water soluble polymer i.e., varying concentration and molar mass of poly(ethylene glycol). Surface tension study shows that poly(ethylene glycol) (PEG) is surface active and its mixture with CTAB and SDS effect the CMC of these surfactants i.e.. CMC' of CTAB increases with addition of PEG. changes more when concentration or molar mass increases while the effect is opposite for SDS. The surface tension curve of the mixed system of CTAB-PEG show that after CMC, (CTAB) molecules replace all the PEG molecules or its loops while in case of SDS-PEG some molecules or loop of the polymer always been present at the interface beyond CMC of SDS. Thermodynamic parameters calculated for the mixed systems shows that free energy of micellization fur CTAB-PEG increases with the increase in concentration and molar mass of polymer, but opposite result was observed for SDS-PEG mixture. The conductometric and tensiometric results, regarding micellizalion were comparable. Whereas, different micellization behavior of CTAB and SDS in the presence of PEG is due to the hydrophobic interaction and ion dipole interacton between CTAB-PEG and SDS-PEG. respectively. Source

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