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Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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Adaptable liquid crystal elastomers with transesterification-based bond exchange reactions.

Drew W Hanzon1, Nicholas A Traugutt1, Matthew K McBride2

  • 1Department of Mechanical Engineering, University of Colorado Denver, Denver, CO 80217, USA. kai.2.yu@ucdenver.edu.

Soft Matter
|January 11, 2018
PubMed
Summary
This summary is machine-generated.

New adaptable liquid crystal elastomers (LCEs) can be programmed with stress and bond exchange reactions (BERs) for two-way shape switching. These reprogrammable LCEs offer potential for sustainable recycling and advanced material applications.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Soft Matter Physics

Background:

  • Adaptable liquid crystal elastomers (LCEs) offer novel programming methods for monodomain samples.
  • Active bond exchange reactions (BERs) enable polymer chain and mesogen alignment under constant stress.

Purpose of the Study:

  • To develop a new adaptable main-chain LCE system utilizing thermally induced transesterification BERs.
  • To investigate the programming, shape-switching behavior, and reprogrammability of these LCEs.

Main Methods:

  • Development of a main-chain LCE system with thermally induced transesterification BERs.
  • Application of constant stress and BERs for programming mesogen alignment.
  • Polarized Fourier transform infrared spectroscopy to confirm alignment.
  • Examination of factors influencing two-way shape switching strain amplitude.

Main Results:

  • Successful programming of LCEs leading to two-way shape switching behavior.
  • Demonstration of reprogrammability by disrupting mesogen alignment via heating.
  • Confirmation of polymer chain and mesogen alignment using polarized FTIR.
  • Investigation of creep stress, temperature, and time effects on shape switching.

Conclusions:

  • The developed adaptable LCE system exhibits programmable and reversible shape-switching capabilities.
  • The dynamic network allows for stress relaxation and reprogramming.
  • Potential applications include surface welding and green recycling due to dissolvability.