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

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 N...

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Bibliographic Details
Published in:Journal of polymer research 2000-06, Vol.7 (2), p.125-134
Main Authors: Wu, Long-Hai, Chu, Chwn-San, Janarthanan, N., Hsu, Chain-Shu
Format: Article
Language:English
Subjects:
Biochemistry
Organic light emitting diodes
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Summary: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 (λ^sub max^ = 475 nm for M9EPX) and have potential use in polarized organic light emitting diode materials.[PUBLICATION ABSTRACT]
ISSN:1022-9760
1572-8935
DOI:10.1007/s10965-006-0112-1