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j. Soc. Cosmet. Chem., 48, 23-40 (January/February 1997) Complexation of aminoalkylcarbamoyl cellulosics and oppositely charged mixed micelies MELISSA MANUSZAK-GUERRINI, LUCILLE SMITH-WRIGHT, ROBERT Y. LOCHHEAD, and WILLIAM H. DALY, Macromolecular Studies Group, Louisiana State University, Baton Rouge, LA 70803-1804 (M.M.-G, L.S.-W., W.H.D.), and Department of Polymer Science, The University of Southern Mississippi, Hattiesburg, MS 39406-0076 (R. Y.L.). Accepted for publication March 31, 1997. Presented at the Society of Cosmetic Chemists' 50th Annual Scientific Meeting, December 8, 1995. Synopsis We have compared the interactions between Polyquaternium 10-mixed surfactant micelle complexes of sodium dodecyl sulfate and Octoxynol with comparable complexes of mono- and diquaternary aminoalkyl- carbamoyl cellulose derivatives. The methods utilized were precipitation studies, fluorescence, and dynamic light scattering. The results of the fluorescence study indicated that miceliar regions were formed in the polymer-mixed surfactant micelie complexes. Temperature studies indicated that the Polyquaternium 1 O-mixed surfactant micelie complex exhibits a different temperature response than complexes formed with polymers synthesized in our laboratories. INTRODUCTION Polymer and surfactant interactions have been a subject of intense research (1-4) re- suiting from the many industrial applications that make use of a polymer-surfactant system. Some of these industrial applications include cosmetic formulation (5-10), rheology control (11), and drug release (12). Fundamentally, these systems are of interest as models for polyion-colloid systems, reversible equilibrium aggregates, and natural supramolecular assemblies. The interactions between polyelectrolyte and surfactant are largely dominated by elec- trostatic forces, with hydrophobic interactions playing a secondary role in complex formation (1-4). Complexation of polyelectrolytes and oppositely charged surfactants begins at a surfactant concentration that is much lower than the critical micelie con- centration (CMC) for the free surfactant (4). This surfactant concentration that first results in complexation is known as the critical aggregation concentration (CAC) (13). In particular, for the case of a cationic polymer and anionic surfactant, precipitation of the charge-neutralized complex is observed (8-10). The region of maximum precipita- 23