title: Structure and composition of mixed micelles of polymerized and monomeric surfactants.
abstract: Micelle structure and composition has been determined by small-angle neutron scattering for mixed micellar solutions of in situ polymerized ω-methacryloyloxyundecyl-trimethylammonium bromide (MUTAB) in equilibrium with its monomeric form at various concentrations, as well as in mixtures with a fluorinated cationic surfactant, heptadecafluorodecylpyridinium chloride (HFDePC), and the non-ionic surfactant, C12E7. Whereas polymerized MUTAB is immiscible with HFDePC and forms two populations of distinct spheroidal micelles, it mixes with C12E7 in all proportions and forms a single average micelle structure depending on composition. These results allow us to explain the origin of the previously reported formation of mixed worm-like micelles of polymerized and monomeric MUTAB that coexist with globular monomeric MUTAB micelles as a consequence of the unfavourable electrostatic interactions that accompany the uncoiling of polymerized MUTAB chains in unimer micelles when swollen by monomeric cationic surfactants.
authors.affiliation: School of Chemistry, F11, The University of Sydney, 2006, Australia.
authors.forename: Paul A
authors.initials: PA
authors.lastname: FitzGerald
authors.affiliation: School of Chemistry, F11, The University of Sydney, 2006, Australia.
authors.forename: Khwanrat
authors.initials: K
authors.lastname: Chatjaroenporn
authors.affiliation: School of Chemistry, F11, The University of Sydney, 2006, Australia. Electronic address: gregory.warr@sydney.edu.au.
authors.forename: Gregory G
authors.initials: GG
authors.lastname: Warr
keywords: Mixed micelles; Polymerizable micelles; Small-angle neutron scattering