Berlin 2005 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 29: POSTER: Polymer physics

CPP 29.60: Poster

Tuesday, March 8, 2005, 16:30–18:30, Poster TU D

Merging of diffusion and relaxation times in concentrated polystyrene/toluene solutions near the glass transition — •Philipp Schleiffer, Jürgen Rauch, and Werner Köhler — Physikalisches Institut, Universität Bayreuth

Diffusion of polystyrene in toluene has been investigated by both dynamic light scattering and transient holographic gratings. Approaching the glass transition by increasing the concentration or lowering the temperature, the α-relaxation emerges on the experimental timescale. The relaxation time of the α-relaxation shows a stronger concentration and temperature dependence than the mutual mass diffusion time and is not q-dependent. It is not clear how the two timescales of the interdiffusion process and the α-relaxation merge. Long-time observations are not easily feasible, since the experimental method is subject to fluctuations on the timescale of seconds. These fluctuations can partly be overcome by proper stabilization techniques.