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Polymer-dispersed liquid crystal elastomers.

Andraž Rešetič1,2, Jerneja Milavec1,2, Blaž Zupančič1

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New polymer-dispersed liquid crystal elastomers enable shape-programmable soft materials without mechanical manipulation. These novel composites offer tunable thermal shape memory for advanced additive manufacturing applications.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Soft Matter Physics

Background:

  • Conventional liquid crystal elastomers require mechanical manipulation during curing, limiting their use in shape-programmable applications.
  • Additive manufacturing and soft robotics demand materials with controllable shape-morphing capabilities.

Purpose of the Study:

  • To develop novel polymer-dispersed liquid crystal elastomers (PDLCEs) that eliminate the need for mechanical manipulation during curing.
  • To enable the fabrication of macroscopically sized, shape-programmable soft materials with tunable thermal responses.

Main Methods:

  • Utilizing external magnetic fields to imprint thermal shape memory anisotropy during curing.
  • Creating a binary soft-soft composite of an isotropic elastomer matrix with oriented liquid crystal elastomer microparticles.
  • Employing freeze-fracture fabrication for microparticle preparation and controlling their concentration, distribution, and orientation.

Main Results:

  • Demonstrated the successful fabrication of macroscopically sized, general-shaped, thermomechanically active elastic objects.
  • Showcased fine-tuning of thermal morphing behavior by adjusting microparticle characteristics and composition.
  • Achieved various Gaussian thermomechanical deformation modes (bend, cup, saddle, twists) and beat-like actuation in planar samples.

Conclusions:

  • Polymer-dispersed liquid crystal elastomers offer a pathway to mechanically-free, shape-programmable soft materials.
  • The developed materials are suitable for advanced applications in additive manufacturing and soft robotics.
  • Tunable microparticle engineering allows precise control over complex thermomechanical deformation modes.