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Elasticity of rubber with smectic microstructure

Osborne1, Terentjev

  • 1Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|November 23, 2000
PubMed
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Smectic elastomer layering significantly enhances elastic response along the layer normal, while parallel modulus remains unaffected. This coupling stabilizes the structure, enabling Bragg peak observation in diffraction patterns.

Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Polymer Science

Background:

  • Elastomers exhibit unique rubber-elastic properties.
  • Smectic or lamellar microstructures introduce ordered phases.
  • Coupling effects between these phenomena are not fully understood.

Purpose of the Study:

  • Investigate the influence of smectic layering on elastomer free energy.
  • Analyze the impact of coupled degrees of freedom on elastic moduli and layer structure.
  • Explain the stabilization of smectic structures within an elastic matrix.

Main Methods:

  • Physically motivated continuum model for elastomer free energy.
  • Analysis of coupled smectic and rubber-elastic degrees of freedom.
  • Calculation of elastic moduli and Debye-Waller factors.

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Main Results:

  • Elastic response to stretching along the layer normal is significantly increased by smectic layering.
  • Elastic modulus parallel to the layers remains unchanged.
  • Landau-Peierls instability is suppressed by the elastic matrix, leading to observable Bragg peaks.

Conclusions:

  • The elastic matrix stabilizes smectic layering in elastomers.
  • Observed Bragg peaks confirm one-dimensional order in the material.
  • The model accurately predicts experimental observations of mechanical and structural properties.