Strain Analysis of a Chiral Smectic A Elastomer
| Autor: | Banahalli R. Ratna, Christopher M. Spillmann, J. M. Adams, Jawad Naciri, John H. Konnert, Jeffrey R. Deschamps |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Diffraction
Materials science Strain (chemistry) Scattering Plane (geometry) FOS: Physical sciences Condensed Matter - Soft Condensed Matter Elastomer Rotation Elasticity Liquid Crystals Condensed Matter::Soft Condensed Matter Condensed Matter::Materials Science Elastomers Nonlinear Dynamics X-Ray Diffraction Phase (matter) Soft Condensed Matter (cond-mat.soft) Stress Mechanical Composite material Beam (structure) |
| Popis: | 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. 28 Pages |
| Databáze: | OpenAIRE |
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