Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 23: Poster: Polymer Dynamics
CPP 23.11: Poster
Mittwoch, 28. März 2012, 11:00–13:00, Poster A
Weakly Segregated Polymers in Electric Fields — •Christian W. Pester1, Markus Ruppel2, Volker S. Urban3, and Alexander Böker1 — 1DWI an der RWTH Aachen and Lehrstuhl für Makromolekulare Materialien und Oberflächen, RWTH Aachen, D-52056 Aachen, Germany — 2Chemical Sciences Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN 37831, USA. — 3Neutron Scattering Science Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN 37831, USA.
We elaborate on the effects of electric fields on weakly phase separated block copolymers in non-selective solvents. In a series of theoretical papers E. Gurovich proposed the reorientation of individual copolymer chain segments due to the external stimulus. The resulting anisotropic distortion of chain conformations results in orientation-dependent alterations of gyration radii with respect to the electric field vector. The resulting anisotropic character of correlation holes is expected to have a profound effect on the small-angle scattering patterns. Indeed, in-situ synchrotron small-angle X-ray scattering (SAXS) at the ESRF in Grenoble allowed us to identify some of the theoretically predicted consequences these elliptical gyration radii would have on the scattering signal, i.e. on domain spacings and order-disorder transitions.