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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/5429

Title: Thermal behavior of diynes with formally conjugated heteroaromatic sidegroups
Authors: SARKAR, A
TALWAR, SS
Keywords: diacetylenic liquid-crystals
diphenyldiacetylene
derivatives
monomers
polymers
optics
Issue Date: 1999
Publisher: CHEMICAL SOC JAPAN
Citation: BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 72(4), 859-864
Abstract: Diynes with heteroaromatic sidegroups directly linked to the acetylenic backbone were found to show liquid crystalline behaviour upon heating. Thus, 1,4-di(2-thienyl)-1,3-butadiyne, 1,4-di(3-thienyl)-1,3-butadiyne, 1,4-di(3-benzo[b]thienyl)1,3-butadiyne, 1-(3-quinolyl)-4-(2-thienyl)-1,3-butadiyne, 1-(3-quinolyl:)-4-(3-thienyl)-1,3-butadiyne, and 5-(2-thienyl)2,4-pentadiyne-1-ol were investigated for their thermal behavior. These diynes also underwent polymerization in their liquid crystalline state, although the polymers so formed did not show liquid crystalline behavior. It was found that the S-atom of the heteroaromatic moieties tends to play a role in making the diynes show liquid crystalline behavior. Differential scanning calorimetry, thermogravimetric analysis and hot stage microscopy were used to investigate the liquid crystalline nature of the diynes. All of them showed a nematic liquid crystalline phase upon annealing, whereas smectic phase was totally absent.
URI: http://dx.doi.org/10.1246/bcsj.72.859
http://dspace.library.iitb.ac.in/xmlui/handle/10054/5429
http://hdl.handle.net/10054/5429
ISSN: 0009-2673
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