Mechanical switching of ferro-electric rubber

Details Mechanical switching of ferro-electric rubber Mechanical switching of ferro-electric rubber

2008-12-09

arxiv.org/abs/0812.1746v1

Phys. Rev. E 79, 061704 (2009)

Physics

Condensed Matter

Soft Condensed Matter

15 pages, 12 figures

Scientific paper

10.1103/PhysRevE.79.061704

At the A to C transition, smectic elastomers have recently been observed to undergo $\sim$35% spontaneous shear strains. We first explicitly describe how strains of up to twice this value could be mechanically or electrically induced in Sm-$C$ elastomers by rotation of the director on a cone around the layer normal at various elastic costs depending on constraints. Secondly, for typical sample geometries, we give the various microstructures in Sm-$C$ akin to those seen in nematic elastomers under distortions with constraints. It is possible to give explicit results for the nature of the textures. Chiral Sm-$C$ elastomers are ferro-electric. We calculate how the polarization could be mechanically reversed by large, hard or soft strains of the rubber, depending upon sample geometry.

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