Structure and composition of mixed micelles of polymerized and monomeric surfactants

Journal of Colloid and Interface Science
Paul A FitzgeraldGregory G Warr

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.

References

Jan 25, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Franck P DuvalGregory G Warr
Nov 18, 2008·Journal of Colloid and Interface Science·Masahiko AbeYeshayahu Talmon
May 26, 2009·Journal of Colloid and Interface Science·Khwanrat ChatjaroenpornGregory G Warr
Apr 2, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Alaaldin M AlkilanyCatherine J Murphy
May 27, 2010·Langmuir : the ACS Journal of Surfaces and Colloids·Khwanrat ChatjaroenpornGregory G Warr
Aug 24, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Paul A FitzGeraldGregory G Warr

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Citations

Jan 17, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Masaaki AkamatsuHideki Sakai

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