Thermal behavior of diynes with formally conjugated heteroaromatic sidegroups
DSpace at IIT Bombay
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Title |
Thermal behavior of diynes with formally conjugated heteroaromatic sidegroups
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Creator |
SARKAR, A
TALWAR, SS |
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Subject |
diacetylenic liquid-crystals
diphenyldiacetylene derivatives monomers polymers optics |
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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.
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Publisher |
CHEMICAL SOC JAPAN
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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 |
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Type |
Article
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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 |
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Language |
en
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