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

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Abstract

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.

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Authors and Affiliations

  1. Department of Applied Chemistry, National Chiao Tung University, Hsinchu, 30050, Taiwan, Republic of China

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

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  1. Long-Hai Wu
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  2. Chwn-San Chu
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  3. N. Janarthanan
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  4. Chain-Shu Hsu
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Correspondence to Chain-Shu Hsu.

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Wu, LH., Chu, CS., Janarthanan, N. et al. Synthesis and characterization of ferroelectric side chain liquid crystal polymers bearing banana-shaped chiral mesogens. J Polym Res 7, 125–134 (2000). https://doi.org/10.1007/s10965-006-0112-1

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  • DOI: https://doi.org/10.1007/s10965-006-0112-1

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