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Smectic A liquid single crystal elastomers showing macroscopic in-plane fluidity

✍ Scribed by Etsushi Nishikawa; Heino Finkelmann; Helmut R. Brand

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
659 KB
Volume
18
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

The mechanical response of a smectic A liquid single crystal elastomer (LSCE) to stress applied perpendicular and parallel to the layers is described. We find that the static modulus perpendicular to the layers is two orders of magnitude larger than the modulus parallel to the layer direction, where the latter is completely due to the crosslinking. Macroscopically the width of the smectic A LSCE does not shrink when a mechanical stress is applied parallel to the layers while the length of the film increases by a factor of 2 thus demonstrating the in‐plane fluidity of the smectic layering.

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## Abstract Smectic‐__A__ liquid single crystal elastomers (S~A~‐LSCE) are materials where the rubber elasticity of the polymer network is combined with the one‐dimensional positional long‐range order of mesogenic groups which are covalently attached to the network. In the systems investigated so f