Synthesis and Mesomorphic Properties of New Side Chain Liquid Crystalline Oligomers Containing Salicylaldimine Mesogenic Groups

New liquid crystalline salicylaldimine-based homopolymers PLC 1 and PLC 2 have been synthesized from their corresponding monomers 5-(10-undecenyloxy)-2-[[(4-(hexyloxy)phenyl)imino]methyl]phenol (LC 1 ) and 5-(10-undecenyloxy)-2-[[(4-(hexyl)phenyl)imino]methyl]phenol (LC 2 ) via free radical polymeri...

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Bibliographic Details
Published in:Molecular Crystals and Liquid Crystals 2013-05, Vol.574 (1), p.40-49
Main Authors: Gulbas, Hulya Elmali, Ocak, Hale, Gursel, Yesim Hepuzer, Bilgin-Eran, Belkiz
Format: Article
Language:English
Subjects:
Chains (polymeric)
Chemical synthesis
Differential scanning calorimetry
Liquid crystal polymers
Liquid crystals
Mesophase
Microscopy
Monomers
Oligomers
Polymerization
Polymers
Salicylaldimine mesogens
side chain liquid crystalline oligomers
Transition temperature
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Summary:New liquid crystalline salicylaldimine-based homopolymers PLC 1 and PLC 2 have been synthesized from their corresponding monomers 5-(10-undecenyloxy)-2-[[(4-(hexyloxy)phenyl)imino]methyl]phenol (LC 1 ) and 5-(10-undecenyloxy)-2-[[(4-(hexyl)phenyl)imino]methyl]phenol (LC 2 ) via free radical polymerization. The polymers were characterized by 1H-NMR, differential scanning calorimetry (DSC) and optical microscopy in polarized light (polarizing microscope). The synthesized polymers have low molecular weights, and so are in the oligomeric domain. The oligomers behave very similarly to their monomers that exhibit smectic mesophases. Replacing the hexyloxy chain by a hexyl chain of the mesogenic unit generates an additional SmC mesophase in the temperature range of both the monomer and oligomer. All the observations suggest that the oligomerization of the liquid crystalline salicylaldimine monomers gives rise to decreased transition temperatures whereas it has no influence on the type and stability of the mesophase formed.
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421406.2012.762494