Volume 72, Number 6, December 2005
|Page(s)||983 - 989|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||18 November 2005|
Unexpected giant elasticity in side-chain liquid-crystal polymer melts: A new approach for the understanding of shear-induced phase transitions
Laboratoire Léon Brillouin (CEA-CNRS), Ce-Saclay - 91191 Gif-sur-Yvette, France
Corresponding author: firstname.lastname@example.org
Accepted: 18 October 2005
Recent studies have revealed that side-chain liquid-crystal polymers typically exhibit shear-induced phases within the isotropic melt. From rheo-birefringence measurements, we demonstrate that those shear-induced phases are not coupled with conventional orientational-order fluctuations. From viscoelastic measurements, we demonstrate that the melt is not liquid but gel-like one hundred degrees away from the glass transition temperature and up to C away from the Isotropic-Nematic phase transition. Finally, rheo-SANS experiments show that the polymer chain is deformed at time scales compatible with this supra-molecular cohesion. The solicitation of this gel-like state explains the emergence of non-linear phenomena.
PACS: 61.30.Vx – Polymer liquid crystals / 62.20.Dc – Elasticity, elastic constants / 61.30.Hn – Surface phenomena: alignment, anchoring, anchoring transitions, surface-induced layering, surface-induced ordering, wetting, prewetting transitions, and wetting transitions
© EDP Sciences, 2005
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