AVS 47th International Symposium
    Material Characterization Tuesday Sessions
       Session MC-TuM

Paper MC-TuM1
Surface Interaction, Coverage and Performance of Quaternary Amine Treatments on Hair

Tuesday, October 3, 2000, 8:20 am, Room 207

Session: Real World Surface Analysis
Presenter: B.C. Beard, Akzo Nobel Chemicals
Authors: B.C. Beard, Akzo Nobel Chemicals
D. Tang, Akzo Nobel Surfactants America
J. Hare, Akzo Nobel Chemicals
Correspondent: Click to Email
Surface analysis by Xray Photoelectron Spectroscopy (XPS) has shown specific one to one (ionic) interaction between cationic quaternary alkyl conditioning molecules and the anionic sulfonate groups present on the hair surface. Conditioning cationic quaternary molecules incorporating ester and alcohol functionality (ester quat) demonstrate a lower number of surface quaternary nitrogen per sulfonate group, indicating an altered surface interaction mechanism. Relative conditioner surface coverage for the ester quat is not reduced despite the apparent decrease in ionic interaction at the surface. Molecular dynamics modeling of the conditioner-hair surface interaction indicate higher adsorption energies for ester quaternary amine conditioning molecule. Industry standard tests demonstrate the superior performance of ester quats, in keeping with the increased surface coverage.