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Relaxation dynamics and crystallization study of glass-forming chiral-nematic liquid crystal S,S-2,7-bis(4-pentylphenyl)-9,9-dimethylbutyl 9H-fluorene (5P-Am*FLAm*-P5)

  • Małgorzata Jasiurkowska-DelaporteEmail author
  • Tomasz Rozwadowski
  • Ewa Juszyńska-Gała̧zka
  • Jan Krawczyk
  • Ewelina Dmochowska
  • Przemysław Kula
  • Maria Massalska-Arodź
Open Access
Regular Article
  • 54 Downloads
Part of the following topical collections:
  1. Dielectric Spectroscopy Applied to Soft Matter

Abstract.

The chiral nematic S,S-2,7-bis(4-pentylphenyl)-9,9-dimethylbutyl9H-fluorene (5P-Am*FLAm*-P5) liquid crystal shows a complex phase diagram strongly dependent on thermal treatment as identified by Polarizing Optical Microscopy (POM) and differential scanning calorimeter (DSC). The molecular dynamics in various thermodynamics states was studied by means of broadband dielectric spectroscopy (BDS). The vitrification of a chiral nematic phase (N*) is manifested by a Vogel-Fulcher-Tammann (VFT)-type temperature dependence of structural relaxation time (\(\tau_{\alpha}\)). Three dielectric relaxation processes exhibiting Arrhenius-like thermal activation were found in conformationally disordered (condis) Cr1 and Cr2 structures. The isothermal cold crystallization process of Cr2 occurs in the metastable N* phase; however, in the non-isothermal experiments, the Cr2 phase is formed in the isotropic phase obtained on heating the metastable N* phase. The findings for the isothermal process were compared with those regarding non-isothermal crystallization.

Graphical abstract

Keywords

Topical issue: Dielectric Spectroscopy Applied to Soft Matter 

Notes

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Copyright information

© The Author(s) 2018

Open Access TThis is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Authors and Affiliations

  • Małgorzata Jasiurkowska-Delaporte
    • 1
    Email author
  • Tomasz Rozwadowski
    • 1
  • Ewa Juszyńska-Gała̧zka
    • 1
  • Jan Krawczyk
    • 1
  • Ewelina Dmochowska
    • 2
  • Przemysław Kula
    • 2
  • Maria Massalska-Arodź
    • 1
  1. 1.Institute of Nuclear PhysicsPolish Academy of SciencesKrakówPoland
  2. 2.Institute of ChemistryMilitary University of TechnologyWarsawPoland

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