| Issue |
Europhys. Lett.
Volume 72, Number 6, December 2005
|
|
|---|---|---|
| Page(s) | 983 - 989 | |
| Section | Condensed matter: structural, mechanical and thermal properties | |
| DOI | https://doi.org/10.1209/epl/i2004-10552-3 | |
| 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: noirez@llb.saclay.cea.fr
Received:
9
December
2004
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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