Polymer / Surfactant Mixtures at the Cyclohexane-Water Interface
Keywords:
Polyelectrolytes, Surfactants, Polyelectrolytes/surfactant complexesAbstract
Measurements of interfacial tension of polymer/surfactant mixtures at oil-water interface are scarce. Here we report on measurements of interfacial tension of Sodium polystyrene sulfonate (NaPSS, anionic polyelectrolyte)/Benzyldimethylhexadecylammonium Chloride (BAC, cationic surfactant), Polyallylamine hydrochloride (PAACl, cationic polyelectrolyte)/sodium dodecyl benzene sulfonate (SDBS, anionic surfactant) and Polyvinyl alcohol (PVA, neutral water soluble polymer)/sodium dodecyl benzene sulfonate (SDBS) at the Cyclohexane-water interface. Individual polyelectrolytes NaPSS and PAACl are interfacial inactive. Polyvinyl Alcohol shows interfacial activity comparable to surface active agents due to its H-bonding forming capacity. For the system SDBS/PAACl, a hump in the interfacial tension was observed with a maxima in the interfacial tension. This is explained by changes of the amount of different polyelectrolyte/surfactant complex structures at the interface and their competition with complexes in the bulk. No hump nor maxima in the interfacial tension was observed for the system BAC/NaPSS but surprisingly an increase in the interfacial tension was observed. This increase is due to insufficient BAC molecules to neutralize the charges at the repeating units of NaPSS. To the best of our knowledge the finding here for the oppositely charge polymer/surfactant systems studied at the cyclohexane interface are reported for the first time.
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