Volume 58, Number 3, May 2002
|Page(s)||389 - 394|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 August 2002|
Direct observation of domain wall excitations in symmetric diblock copolymer melts at and above the order-disorder transition
ESPCI, Physico-chimie Structurale et
Macromoleculaire 10 rue Vauquelin, F-75005 Paris Cedex, France
2 Institut für Festkörperforschung, Forschungszentrum Jülich D-52425 Jülich, Germany
3 School of Chemical Engineering, Olin Hall, Cornell University Ithaca, NY 14850, USA
4 Institut Laue-Langevin - B.P. 156X, Avenue des Martyrs F-38042 Grenoble Cedex 9, France
Accepted: 11 February 2002
The dynamics of the chain junctions in a lamellar diblock copolymer melt around the order-disorder transition temperature (ODT) has been investigated by neutron spin echo (NSE) spectroscopy, utilizing deuterated diblock copolymers with a hydrogen-labeled section at the junction point. We observed a dynamic response which was more than one order of magnitude faster than expected from standard Rouse dynamics. The corresponding driving force was shown to relate to interfacial tension implying the existence of interfacial walls near the ODT.
PACS: 61.12.-q – Neutron diffraction and scattering / 47.50.+d – Non-Newtonian fluid flows / 83.80.Hj – Suspensions, dispersions, pastes, slurries, colloids
© EDP Sciences, 2002
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