Supramolecular main chain liquid crystalline polymers utilizing azopyridine derivatives

A series of main chain liquid crystalline polymers were formed through intermolecular hydrogen bonding between a functionalized bisazopyridine phenol and aromatic bisacids. The behaviour of these complexes was studied through differential scanning calorimetry and thermal polarizing optical microscop...

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Bibliographic Details
Published in:Liquid crystals 2006-05, Vol.33 (5), p.567-572
Main Authors: Rogness, Donald C., Riedel, Paul J., Sommer, Jonathan R., Reed, Dwayne F., Wiegel, Kurt N.
Format: Article
Language:English
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Summary:A series of main chain liquid crystalline polymers were formed through intermolecular hydrogen bonding between a functionalized bisazopyridine phenol and aromatic bisacids. The behaviour of these complexes was studied through differential scanning calorimetry and thermal polarizing optical microscopy. The presence of the hydrogen bonds was confirmed through infrared spectroscopy. These complexes formed thermotropic mesophases. The phases were determined to be nematic in nature from the schlieren textures of the optical micrographs. As the length of flexible spacer groups separating the mesogenic portions increased, the clearing temperatures of the mesophases decreased. As the length of the rigid component increased, the clearing temperature increased. A new bisacid species based on 2-hydroxy-6-naphthoic acid was used to increase clearing temperatures while remaining within an acceptable temperature window.
ISSN:0267-8292
1366-5855
DOI:10.1080/02678290600604973