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Spontaneous shears in smectic elastomers.

J M Adams1, M Warner

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

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 12, 2006
PubMed
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Smectic elastomers exhibit spontaneous shear during thermal phase transitions, unlike nematic elastomers. This shear distortion is linked to director rotation, not just order magnitude changes.

Area of Science:

  • Materials Science
  • Polymer Physics
  • Soft Matter Physics

Background:

  • Smectic elastomers undergo phase transitions between smectic A and C phases.
  • These transitions involve changes in molecular order and director orientation.
  • Previous studies on nematic elastomers show spontaneous elongation during order magnitude changes.

Purpose of the Study:

  • To model the spontaneous elastic shear deformations in smectic elastomers during the smectic A to C phase transition.
  • To understand the relationship between director tilt and shear deformation.
  • To investigate the influence of multistage cross-linking on elastomer behavior.

Main Methods:

  • Theoretical modeling of elastic shear deformations.
  • Analysis of thermal transitions between smectic A and C phases.

Related Experiment Videos

  • Incorporation of multistage cross-linking effects in monodomain elastomers.

    • Main Results:

    • Spontaneous shear deformation accompanies the tilt of the director in smectic elastomers.
    • The primary distortion in smectic elastomers is shear, linked to director rotation.
    • The angles of molecular tilt and spontaneous shear deformation are not directly proportional.

    Conclusions:

    • Smectic elastomers exhibit unique shear behavior during phase transitions, distinct from nematic elastomers.
    • Director rotation is the key mechanism driving spontaneous shear in these materials.
    • The relationship between tilt and shear is complex and influenced by elastomer structure.