Preparation of some Ethoxylated Alkyl Sulfosuccinate Surfactants and Investigate their Mixed Solutions

Abstract

Abstract A series of ethoxylated sodium monoalkyl sulfosuccinate (ESMASS) ester surfactants were prepared by reaction of polyethylene glycol (M. wt. 600) with sodium mono alkyl sulfosuccinate (SMASS). The esters were prepared by reaction of octyl, lauryl or cetyl alcohol with sodium sulfosuccinate (SSS) to prepare E(14)SMOSS, E(14)SMLSS and E(14)SMCSS. The chemical structures of the prepared surfactants were confirmed by FTIR and 1HNMR spectroscopy. The surface tension of the synthesized surfactants was measured at 25°C individually or mixing at different molar fraction with the sodium dioctyl sulfosuccinate. The surface active properties were calculated and micellization process of the mixture was investigated. The molar ratio of anionic (SDOSS) and anionic-nonionic surfactants moiety [E(14)SMOSS, E(14)SMLSS and E(14)SMCSS] in the mixed aggregates were deduced using the regular solution approximation equations. Depending on the critical micelle concentration values for each surfactant individually and mixed systems, the minimum surface tension was exhibited at mixture of [0.6 SDOSS and 0.4 E(14)SMCSS]. The micellar composition of the mixed aggregates were explained and discussed based on the effect of their chemical structures. Activity coefficient (f1, f2), interaction parameter (b) and ideality of anionic-nonionic mixed aggregates were evaluated.