Regensburg 2007 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Polymer Physics III: Interfaces

CPP 12.9: Vortrag

Dienstag, 27. März 2007, 12:15–12:30, H40

Oscillating Phase Separation in Polymer Solutions — Doris Vollmer and •Günter Auernhammer — MPI für Polymerforschung, Ackermannweg 10, 55128 Mainz

The kinetics of phase separation of polymer solutions under slow cooling is discussed. For a broad range of compositions (about 1g/L until 20g/L) and cooling rates (cooling rates below about 5K/h) the mixtures show pronounced oscillations in the heat capacity and the turbidity. Whereas the oscillations in the heat capacity seem to be due to the gel phase, the oscillations in the tubidity are due to the sol phase. The period of the oscillation does not depend on composition within the investigated temperature interval. The oscillations are of thermodynamic origin.