Regensburg 2002 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 9: Blockcopolymere, Blends und Kompositmaterialien
CPP 9.3: Vortrag
Dienstag, 12. März 2002, 14:10–14:30, H38
Orientation Kinetics in Concentrated Block Copolymer Solutions — •Alexander Böker1,2, Hubert Elbs1, Helmut Hänsel1, Armin Knoll1, Sabine Ludwigs1, Heiko Zettl1, Volker Urban3, Volker Abetz2, Axel H.E. Müller2,4, and Georg Krausch1,4 — 1Lehrstuhl für Physikalische Chemie II — 2Lehrstuhl für Makromolekulare Chemie II — 3European Synchrotron Radiation Facility (ESRF), F-38043 Grenoble, France — 4Bayreuther Zentrum für Kolloide und Grenzflächen,Universität Bayreuth, D-95440 Bayreuth, Germany
We investigated the kinetics of the microdomain alignment of lamellar and cylindric block copolymer solutions (e.g. polystyrene-b-polyisoprene in toluene) under the influence of an external electric DC field by in-situ Synchrotron-SAXS.
Our results show that the orientation kinetics can be fitted by a simple exponential law with time constants varying from a few seconds to some minutes depending on the polymer concentration, the electric field strength and the difference in the dielectric constants of the blocks.
From the experimental results we can determine an optimum set of parameters which allows improved preparation of highly anisotropic bulk polymer samples.