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

Strain Analysis of a Chiral Smectic A Elastomer