Journal article

Mechanical deformations in smectic-C main-chain liquid-crystalline elastomers

  • Sánchez-Ferrer, Antoni Physics Department, University of Fribourg, Switzerland - Institute for Macromolecular Chemistry, Albert Ludwigs University, Freiburg, German
  • Finkelmann, Heino Institute for Macromolecular Chemistry, Albert Ludwigs University, Freiburg, Germany
Published in:
  • Molecular Crystals and Liquid Crystals. - 2009, p. 357-366
English A novel crosslinked smectic-C Main-Chain Liquid-Crystalline Elastomer (MCLCE) has been synthesized by polycondensation of vinyloxy-terminated mesogens, tetramethyldisiloxane and pentamethylpentaoxapentasilecane. The introduction of the functional vinyloxy group allows the synthesis of well-defined networks having low soluble content and good mechanical properties. Networks having a macroscopic uniformly ordered director and a conical distribution of the smectic layer normal with respect to the director are mechanically deformed by uniaxial and shear deformations. Under uniaxial deformations two processes were observed: parallel to the director the mechanical field directly couples to the smectic tilt angle while perpendicular to the director a reorientation process takes place. A shear deformation parallel and perpendicular to the director causes a uniform layer orientation and the network exhibits a smectic-C monodomain phase having a macroscopic uniform director and layer orientation. This process is reversible for shear deformation perpendicular and irreversible by applying the shear force parallel to the director.
Faculté des sciences
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