Berlin 2005 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 4: SYMPOSIUM: Dynamics of multi-component fluids IV
CPP 4.4: Vortrag
Freitag, 4. März 2005, 16:45–17:00, TU C243
Slow dynamics of block copolymer melts in different ordered morphologies — •C.M. Papadakis1, F. Rittig2, P. Stepanek3, K. Mortensen4, and K. Almdal4 — 1Physikdepartment E13, TU München — 2BASF AG, Ludwigshafen — 3Institute of Macromolecular Chemistry, Prague — 4Risø National Laboratory, Denmark
Diblock copolymers in the melt state form a variety of mesoscopically ordered morphologies, depending on their composition and on temperature. They can thus serve as a model system for studying the dynamics in different ordered morphologies with the disordered state as a reference state.
We have studied the slow dynamics in the disordered, the lamellar, the gyroid, the hexagonal and the body-centered cubic phase combining small-angle neutron scattering, dynamic light scattering and pulsed field gradient NMR. The dimensionality of the morphology has a great influence on the dynamics: The copolymer diffusion along the interfaces is anisotropic, in contrast to the isotropic disordered phase, and collective motions like undulations of lamellar interfaces or the fluctuation of the micellar distance in the body-centered cubic state become possible.