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Elastic effects in disordered nematic networks.

N Uchida1

  • 1Department of Physics, Kyoto University, Kyoto 606, Japan.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|April 24, 2002
PubMed
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Disordered nematic elastomers show a unique soft mechanical response due to region alignment during stretching. Further stretching leads to a sharp transition to a macroscopically aligned state, influenced by internal stress.

Area of Science:

  • Soft Matter Physics
  • Materials Science
  • Polymer Physics

Background:

  • Nematic elastomers are complex materials exhibiting unique mechanical properties.
  • Understanding their behavior under stress is crucial for material design.
  • Disorder in these networks significantly impacts their macroscopic response.

Purpose of the Study:

  • To numerically investigate the elastic effects in a 2D model of disordered nematic elastomers.
  • To elucidate the origin of the unusual soft mechanical response observed in these materials.
  • To analyze the transition to a macroscopically aligned state and the influence of internal stress.

Main Methods:

  • Numerical simulations in two dimensions.
  • Modeling disordered nematic elastomer networks.

Related Experiment Videos

  • Analysis of mechanical response under stretching.
  • Investigation of internal stress effects.

    • Main Results:

    • Networks crosslinked in the isotropic phase display an unusual soft mechanical response to stretching.
    • This response originates from the progressive alignment of elongated, orientationally correlated regions along the director.
    • A distinct crossover to a macroscopically aligned state is observed upon increased stretching.

    Conclusions:

    • The study reveals a novel mechanism for soft elasticity in disordered nematic elastomers.
    • Gradual alignment of correlated regions governs the initial mechanical softening.
    • Internal stress plays a role in the observed elastic effects and alignment transitions.