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Related Concept Videos

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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Stiffening Liquid Crystal Elastomers with Liquid Crystal Inclusions.

Sahad Vasanji1, Matthew Gene Scarfo1, Arwa Alyami2

  • 1Department of Chemical Engineering, Institute for Polymer Research, Center for Bioengineering and Biotechnology, Waterloo Institute for Nanotechnology, Waterloo, ON, N2L 3G1, Canada.

Advanced Materials (Deerfield Beach, Fla.)
|June 9, 2025
PubMed
Summary
This summary is machine-generated.

Adding low molecular weight liquid crystals (LMWLCs) to liquid crystal elastomers (LCEs) significantly enhances stiffness and toughness. This method improves mechanical properties without compromising molecular order or thermal strain, making LCEs more suitable for soft robotics.

Keywords:
cybotacticinduced smecticliquid crystal elastomerspolymerization‐induced phase separationsoft actuators

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Area of Science:

  • Materials Science
  • Polymer Science
  • Soft Robotics

Background:

  • Liquid crystal elastomers (LCEs) offer large, programmable shape changes, ideal for soft robots.
  • Existing methods to enhance LCE stiffness often compromise molecular order and thermal strain.
  • A need exists for improved LCE mechanical properties without sacrificing key performance characteristics.

Purpose of the Study:

  • To enhance the stiffness and toughness of LCEs.
  • To investigate the effect of low molecular weight liquid crystals (LMWLCs) on LCE mechanical properties.
  • To maintain molecular order and thermal strain while improving stiffness.

Main Methods:

  • Incorporation of LMWLCs into LCEs to create LC-LCEs.
  • Thermomechanical analysis to evaluate mechanical properties and phase transitions.
  • X-ray analysis to confirm structural changes and molecular order.

Main Results:

  • LC-LCEs exhibit enhanced linear elasticity before reaching a soft elastic plateau.
  • An additional mesophase, evolving to short-range smectic order, was observed in polydomain LC-LCEs.
  • Monodomain LC-LCEs showed 6.5- to 9.0-fold stiffness enhancement with improved molecular order and thermal strain.
  • LC-LCEs demonstrated doubled work densities and up to 25% active thermal stroke under significant loads.

Conclusions:

  • LMWLC inclusion is a simple and effective strategy to significantly improve LCE mechanical properties.
  • The enhanced properties arise from the interplay of LMWLC phase separation and strain-enhanced smectic ordering.
  • This approach offers a robust method for developing advanced LCE materials for soft robotics and other applications.