Synthesis and Surface Activity of Alkyl-Methylnaphthalene Sulfonate Surfactants

Abstract

A series of alkyl methylnaphthalene sulfonate surfactants (AMNS) were synthesized and their structures were confirmed by IR, UV and ESI-MS. The surface tension measurements were performed by the ring method. The effects of the alkyl side chains on critical micelle concentrations (cmc), and the surface tensions (γ cmc ) at cmc and C 20 were investigated. The results indicated that the anionic surfactants prepared exhibited good surface activity. The study of adsorption at the surfaces of aqueous solution and the thermodynamics of the surfactant micelles showed that both the alkyl side chains and the aromatic rings were attributed to the surface activity.