The Synergism Effect Between Sodium Dodecylbenzene Sulfonate and a Block Copolymer in Aqueous Solution |
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| Authors: | E M S Azzam |
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| Affiliation: | (1) Applied Surfactants Laboratory, Petrochemicals Department, Egyptian Petroleum Research Institute, 11727, Nasr City, Cairo, Egypt |
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| Abstract: | The synergistic behavior of sodium dodecylbenzene sulfonate (SDBS) with poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene
oxide) (PEO–PPO–PEO) block copolymer was studied using surface tension measurements. The surface tension of single and mixed
solutions of SDBS and the block copolymer in this study was measured at different concentrations and at 25 °C. The critical
micelle concentration (CMC) of these solutions was determined from the surface tension measurements. The SDBS gives higher
CMC values than those of the block copolymer. The results show that the CMC value of SDBS decreases as the molar ratio of
SDBS increases in the mixture solution with the block copolymer. The surface parameters of adsorption and micellization for
single and mixed solutions were investigated. The results show that the surface and micellization properties of SDBS were
improved as a result of mixing with the block copolymer. The mole fractions in the micelles and interaction parameters of
the mixed solutions were calculated. The foam stability of single and mixed solutions at 25 °C was determined. The results
show that the SDBS has more foam stability than the block copolymer and the foam stability increases as the molar ratio of
SDBS increase in mixed solution of it with block copolymer.
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| Keywords: | SDBS Copolymer Synergism Surface and thermodynamic Micellization Adsorption Foam stability |
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