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Unexpected giant elasticity in side-chain liquid-crystal polymer melts: A new approach for the understanding of shear-induced phase transitions

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 15 °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.