Volume 57, Number 1, January 2002
|Page(s)||53 - 59|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Induced roughness in thin films of smectic- elastomers
Physik anisotroper Fluide, Universität
Leipzig Linnestr. 5, D-04103 Leipzig, Germany
2 Cavendish Laboratory, University of Cambridge - Cambridge CB3 0HE, UK
3 Institut für Organische Chemie, Universät Mainz Duesbergweg 10-14, D-55099 Mainz, Germany
Corresponding author: firstname.lastname@example.org
Accepted: 10 October 2001
The surface topography of a thin homeotropically oriented film of ferroelectric smectic-C* elastomer is studied by atomic force microscopy. We find that when the film is mechanically stretched, its surface becomes increasingly rough, in proportion to the applied strain. The effect depends strongly on the nature of crosslinks forming the elastomer network. The r.m.s. roughness correlations show a consistent trend . We introduce a theoretical model assuming that random disorder in the smectic tilt angle is induced by deformations via the coupling of mesogens to the elastic network. The model describes the observed power law and gives a prediction for the correlation length ξ.
PACS: 61.30.-v – Liquid crystals / 61.41.+e – Polymers, elastomers, and plastics / 68.35.Ct – Interface structure and roughness
© EDP Sciences, 2002
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