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CPP: Chemische Physik und Polymerphysik

CPP 30: POSTER: Chemical physics

CPP 30.49: Poster

Dienstag, 8. März 2005, 16:30–18:30, Poster TU D

Polymer – surfactant interactions: Effect of surfactant concentration on polymer conformation and aggregation size — •J.B. Stanislaus¹, H. Zettl¹, J. Crassous², L. Li², O. Korenberg³, M. Gottlieb³, M. Ballauff², and G. Krausch¹ — ¹Physical Chemistry II, Universität Bayreuth, Universitätstraße 30, 95440, Bayreuth. — ²Physical Chemistry I, Universität Bayreuth, Universitätstraße 30, 95440, Bayreuth. — ³Department of Chemical Engineering, Ben–Gurion University of the Negev, Israel.

Association between polymers and surfactants has drawn much attention in the last decades. Mixed aggregates are formed already at low surfactant concentration, and can change the solution properties dramatically. This in turn affords a variety of industrial applications (cosmetics, paints,. etc). In this work we study a system containing an anionic surfactant sodium dodecyl sulphate (SDS) and a non ionic polymer methylcellulose (MC) in water. Fluorescence correlation spectroscopy(FCS) is used to study the dynamics of the aggregates. We are able to follow the change of the solution properties over a wide concentration range of both polymer and surfactant. The maximum aggregation of MC and SDS is linearly dependent on MC concentration. The results are compared to Small Angle X-ray Scattering (SAXS) and rheology measurements.