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Researchers developed new liquid crystalline elastomers (LCEs) with rapid photopolymerization, achieving 150% strain for programmable 3D shape changes. This advances LCE technology for complex material design.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Robotics

Background:

  • Liquid crystalline elastomers (LCEs) enable shape-changing materials but programming their mechanical response with high spatial resolution is challenging.
  • Previous methods for programming LCEs, like magnetic or mechanical alignment, have limitations in achieving fine control over mechanical properties.
  • Achieving high strain (>30%) and precise local programming is crucial for spontaneous 3D shape transformation.

Purpose of the Study:

  • To develop a novel formulation strategy for creating LCEs with programmable stimulus-response.
  • To achieve large reversible strain capabilities (up to 150%) in LCEs.
  • To enable rapid fabrication of LCEs with spatially controlled mechanical properties for complex 3D shape changes.

Main Methods:

  • Utilizing photopolymerization of thiol-ene/acrylate formulations for LCE synthesis.
  • Tuning the mechanical behavior by adjusting the cross-link density of the polymer network.
  • Demonstrating spatial and hierarchical programming of the director profile within the LCEs.

Main Results:

  • Developed LCEs exhibiting large reversible strain up to 150% via rapid photopolymerization.
  • Reduced material preparation time significantly from days to minutes.
  • Successfully demonstrated 3D shape changes, including twisting ribbons and localized Gaussian curvature, through programmed director profiles.

Conclusions:

  • The new photopolymerization strategy offers a rapid and effective method for creating highly stretchable and programmable LCEs.
  • The ability to tune mechanical behavior and program director profiles allows for precise control over 3D shape morphing.
  • These advancements open new possibilities for designing sophisticated soft materials and actuators.