Abstract
The effect of propylene glycol (PG), its monoalkyl ethers and esters on the micellar behavior of a cationic surfactant tetradecyltrimethylammonium bromide (TTAB) in aqueous solution was examined by employing electrical conductivity and small angle neutron scattering (SANS) technique. From conductivity measurements critical micelle concentration (CMC) and degree of counter ion dissociation (α) were evaluated. PG and propylene glycol monomethyl ether (PGMME) delayed micelle formation while propylene glycol monobutyl ether (PGMBE) propylene glycol monomethyl ether acetate (PGMMEA) and propylene glycol diacetate (PGDA) favored the process at studied concentrations. SANS data revealed the effect of all these additives for 100mM TTAB; decrease in micelle size and aggregation number (Nagg) was observed. Results are discussed in terms of effect of additives on water structure and solvent properties and correlated with structure of additives and their octanol-water partition co-efficient values (log Po/w).
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