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Soft and nonsoft structural transitions in disordered nematic networks

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

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|November 23, 2000
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Summary

Disordered nematic elastomers exhibit unique properties due to quenched random stresses and nonlocal interactions. These factors influence mechanical transitions and director fluctuations, impacting material behavior.

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Area of Science:

  • Soft Matter Physics
  • Polymer Science
  • Materials Science

Background:

  • Disordered nematic elastomers and gels are complex materials with unique mechanical and optical properties.
  • Understanding the influence of quenched disorder and nonlocal interactions is crucial for predicting their behavior.

Purpose of the Study:

  • To theoretically investigate the properties of disordered nematic elastomers and gels.
  • To elucidate the roles of nonlocal elastic interactions and crosslinking conditions.
  • To analyze the impact of quenched disorder on director fluctuations.

Main Methods:

  • Theoretical investigation using an affine-deformation model of nematic rubber elasticity.
  • Incorporation of quenched random stresses into the model.
  • Numerical study of dynamical relaxation of the domain structure.
  • Analysis of director fluctuations in the monodomain state.

Main Results:

  • Quenched random stresses cause loss of long-range orientational order in networks crosslinked in the isotropic phase.
  • Mechanical quasi-Goldstone modes explain a soft polydomain-monodomain (PM) transition and a "four-leaf clover" scattering pattern.
  • Dynamical relaxation of domain structure follows power-law kinetics.
  • Quenched disorder dominates director fluctuations near the PM transition threshold.
  • Crosslinking polydomain melts leads to correlated disorder, making the PM transition non-soft.

Conclusions:

  • Nonlocal elastic interactions and crosslinking conditions significantly influence the properties of disordered nematic elastomers.
  • The study provides a detailed understanding of mechanical transitions and director fluctuations in these materials.
  • The findings offer insights into the design and application of nematic elastomers and gels.