Strain Analysis of a Chiral Smectic A Elastomer

Details Strain Analysis of a Chiral Smectic A Elastomer Strain Analysis of a Chiral Smectic A Elastomer

2010-08-31

arxiv.org/abs/1008.5343v1

Phys. Rev. E 82, 031705 (2010)

Physics

Condensed Matter

Soft Condensed Matter

28 Pages

Scientific paper

10.1103/PhysRevE.82.031705

We present a detailed analysis of the molecular packing of a strained liquid crystal elastomer composed of chiral mesogens in the smectic A phase. X-ray diffraction patterns of the elastomer collected over a range of orientations with respect to the X-ray beam were used to reconstruct the three-dimensional scattering intensity as a function of tensile strain. For the first time, we show that the smectic domain order is preserved in these strained elastomers. Changes in the intensity within a given scattering plane are due to reorientation, and not loss, of the molecular order in directions orthogonal to the applied strain. Incorporating the physical parameters of the elastomer, a nonlinear elastic model is presented to describe the rotation of the smectic-layered domains under strain, thus providing a fundamental analysis to the mechanical response of these unique materials.

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