Abstract
Catanionic surfactants play a prominent role in the biotechnology, drag-reduction agents, microreactors and other fields, but the catanionic surfactants are all synthesized from halogenated quaternary ammonium salts or dimethyl sulfated quaternary ammonium salts more or less. In this context, we put forward a new synthetic method without halogenated organics or dimethyl sulfated organics to improve the conventional method. Quite different, a typical catanionic surfactant ammonium benzenesulfonate was synthesized from tertiary amine, dimethyl carbonate and dodecylbenzenesulfonic acid. The structure of the product was established using various techniques, Fourier transform infrared spectroscopy (FT-IR), H-nuclear magnetic resonance (1H NMR), C-nuclear magnetic resonance (13C NMR), and electrospray ionization mass spectrometry (ESI-MS). Also, the surface activities and aggregations of ammonium benzenesulfonate were detected by equilibrium surface tension and dynamic surface tension, contact angle, dynamic light scattering (DLS). Our results provide proofs for the successful synthesis of ammonium benzenesulfonate and the explanations for the surface properties and aggregation behaviors.
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