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Thermal behavior of diynes with formally conjugated heteroaromatic sidegroups

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Title Thermal behavior of diynes with formally conjugated heteroaromatic sidegroups
 
Creator SARKAR, A
TALWAR, SS
 
Subject diacetylenic liquid-crystals
diphenyldiacetylene
derivatives
monomers
polymers
optics
 
Description 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.
 
Publisher CHEMICAL SOC JAPAN
 
Date 2011-07-20T09:41:10Z
2011-12-26T12:51:25Z
2011-12-27T05:35:55Z
2011-07-20T09:41:10Z
2011-12-26T12:51:25Z
2011-12-27T05:35:55Z
1999
 
Type Article
 
Identifier BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, 72(4), 859-864
0009-2673
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
 
Language en