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Related Experiment Videos

Polydomain-monodomain transition in nematic elastomers.

S V Fridrikh1, E M Terentjev

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

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|April 24, 2002
PubMed
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This study models nematic elastomers, revealing a critical transition from polydomain to monodomain textures under extension. This transition, marked by a stress-strain plateau, occurs via domain rotation, aligning with experimental data.

Area of Science:

  • Materials Science
  • Polymer Physics
  • Soft Matter Physics

Background:

  • Nematic elastomers exhibit unique director textures and alignment properties.
  • Understanding their behavior under mechanical stress is crucial for applications.

Purpose of the Study:

  • To theoretically describe director textures and alignment of nematic elastomers during uniaxial extension.
  • To investigate the polydomain-monodomain transition mechanism and its characteristics.

Main Methods:

  • Theoretical modeling using randomly quenched disorder from network cross-links.
  • Application of the replica trick and Gaussian variational approximation.
  • Analysis of stress-strain curves and domain dynamics.

Main Results:

Related Experiment Videos

  • A critical polydomain-monodomain transition is predicted, featuring a small jump and rapid increase in the macroscopic order parameter.
  • The transition is characterized by a plateau in the stress-strain curve.
  • Critical stress is estimated as approximately muQ(ch), where mu is the rubber modulus and Q(ch) is chain anisotropy.

Conclusions:

  • The model accurately predicts the critical transition and its characteristics in nematic elastomers.
  • Domain rotation, not growth, drives texture alignment during the transition.
  • Theoretical predictions show qualitative agreement with experimental data from various nematic elastomers.