Berlin 2005 – scientific programme

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CPP: Chemische Physik und Polymerphysik

CPP 5: SYMPOSIUM: Dynamics of multi-component fluids POSTER

CPP 5.15: Poster

Friday, March 4, 2005, 17:15–19:00, Poster TU D

Relaxation and recovery phenomena in melts of PS/PMMA blends — •Ulrich A. Handge — Institute of Polymers, Department of Materials, ETH Zürich, HCI H 529, Wolfgang-Pauli-Straße 10, 8093 Zürich, Switzerland

The rheological properties of melts of binary blends of immiscible polymers are strongly influenced by the viscoelastic properties of the single components and the interfacial tension between the two phases. The interfacial tension contributes to the viscoelasticity of the molten blend. In this work, we focus on interfacial tension driven relaxation and recovery phenomena in a molten polystyrene/poly(methyl methacrylate) (PS/PMMA) blend and report on experimental phenomena and theoretical models. In relaxation after melt elongation, the interfacial tension can cause interesting breakup phenomena, for example undulations of the Rayleigh instability [1] and formation of holes and fingers in equibiaxially highly elongated PS droplets [2]. These breakup phenomena play a key role for polymer processing. In recovery experiments, the interfacial tension increases the elasticity of the melt, an effect which can be theoretically described by an effective medium approximation [3-5].
S. Tomotika, Proc. Roy. Soc. Lond. Ser. A 150, 322 (1935).
U.A. Handge, in preparation.
U.A. Handge, J. Rheol. 47, 969 (2003).
U.A. Handge, AIP Conference Proceedings 708, 52 (2004).
U.A. Handge and P. Pötschke, J. Rheol. 48, 1103 (2004).