Journal of Polymer Research

, Volume 7, Issue 2, pp 125–134 | Cite as

Synthesis and characterization of ferroelectric side chain liquid crystal polymers bearing banana-shaped chiral mesogens

  • Long-Hai Wu
  • Chwn-San Chu
  • N. Janarthanan
  • Chain-Shu Hsu


A series of ferroelectric liquid crystal polymers having banana-shaped side chain mesogens were synthesized through photo-polymerization of epoxide moiety. 2,5-disubstituted-thiophene sub-unit was used in synthesizing the banana-shaped monomers. These liquid crystal compounds were characterized by NMR, differential scanning calorimetry (DSC) and optical polarized microscopy (POM). Mesomorphism was investigated as a function of spacer units. All the synthesized low molar mass banana-shaped compounds exhibit smectic blue phase, but chiral smectic C phase could be observed only on compounds having longer spacer. The clearing temperature of low molar mass compounds fluctuated a little when spacer length varies. All polymers exhibit cholesteric mesophase and an observable glass transition. These liquid crystalline compounds reveal strong photoluminescence at visible region (λmax = 475 nm for M9EPX) and have potential use in polarized organic light emitting diode materials.


Banana-shape Ferroelectricity Smectic blue phase 


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Copyright information

© Springer Science+Business Media, Inc. 2000

Authors and Affiliations

  • Long-Hai Wu
    • 1
  • Chwn-San Chu
    • 1
  • N. Janarthanan
    • 1
  • Chain-Shu Hsu
    • 1
  1. 1.Department of Applied ChemistryNational Chiao Tung UniversityHsinchuTaiwan, Republic of China

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