4.7 Article

Microscopy of Diffuse Nematic-Isotropic Transition in Main-Chain Nematic Liquid-Crystal Elastomers

Journal

MACROMOLECULES
Volume 54, Issue 8, Pages 3678-3688

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.1c00356

Keywords

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Funding

  1. European Research Council [786659]
  2. JSPS KAKENHI [JP 20K20967]
  3. MEXT KAKENHI [JP 17H06417, JP 17H06413]

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The study found that the ordering transition of polydomain main-chain nematic liquid crystal elastomers differs from the classical first-order transition, showing a continuous nature. Unexpectedly, the characteristic correlation length of the fading polydomain structure remains unchanged across the transition.
Nematic-isotropic phase transition in liquid-crystal elastomers (LCEs), which drastically alters the macroscopic properties of the material, is attractive for both fundamental physics and applications. Herein, we introduce new experimental methods based on polarized and fluorescence optical microscopy to characterize the phase transition of polydomain LCEs, monitoring the order parameter and the nematic domain structure. It is demonstrated that polydomain main-chain nematic LCEs exhibit an ordering transition very different from the classical first-order one, having a diffuse continuous nature. Unexpectedly, the characteristic correlation length of the fading polydomain structure remains unchanged across the transition.

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