Dresden 2006 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 27: POSTER Polymer Physics and Materials

CPP 27.48: Poster

Donnerstag, 30. März 2006, 17:00–19:00, P2

Polymer-surfactant interactions: Effect of temperature on aggregation — •John Bosco Stanislaus¹, Heiko Zettl¹, Jerome Crassous², Mathias Ballauff², and Georg Krausch¹ — ¹Physical Chemistry II, Universität Bayreuth, Universitätstraße 30, 95440, Bayreuth, Germany — ²Physical Chemistry I, Universität Bayreuth, Universitätstraße 30, 95440, Bayreuth, Germany

The interactions between an anionic surfactant sodium dodecyl sulphate (SDS) and hydrophobically modified non ionic polymer, methylcellulose (MC), in water have been investigated by fluorescence correlation spectroscopy (FCS) and rheology. FCS is used to study the dynamics of the aggregates. We are able to follow the solution properties over a wide concentration range of both polymer and surfactant via measurement of the diffusion time of single dye molecules. At constant MC concentration the diffusion time increases gradually with SDS concentration. Starting from certain SDS concentration it decreases again to a minimum when the SDS concentration is further increased. This behaviour is coinciding with the behaviour of the zero shear viscosity. Two possible aggregations can be identified above the critical aggregation concentration(CAC). The changes in diffusion time and aggregation states are studied as a function of temperature. Moreover the gelation of MC is studied by piezoelectric axial vibrator.