Synthesis and thermotropic properties of new polyacrylates containing alkanoyl-substituted azobenzene mesogens
作者:
Giancarlo Galli,
Emo Chiellini,
Michele Laus,
SanteA. Angeloni,
Daniele Caretti,
Enzo Fanelli,
Giovanni Poeti,
Bernard Gallot,
期刊:
Liquid Crystals
(Taylor Available online 1994)
卷期:
Volume 16,
issue 1
页码: 115-125
ISSN:0267-8292
年代: 1994
DOI:10.1080/02678299408036524
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The synthesis and characterization of a series of new polyacrylates1, containing the azobenzene mesogen spaced from the backbone by a hexamethylene segment and substituted in the 4-position by an alkanoyl chain of variable length, together with those of the relevant precursors are reported. Optical and X-ray analyses provided evidence for the presence of a smectic A mesophase in a fairly broad range of temperature in both polymers and low molar mass compounds. In polyacrylates1, the side-chain substituents were fully interdigitated in a smectic A1structure. The comparison of the transition parameters of polymers1with those of another series of polyacrylates7containing the azobenzene unit substituted in the 4-position by an alkyloxy chain of variable length revealed that the replacement of an oxygen atom by a carbonyl group strongly enhanced the smectogenic character of the azobenzene group.
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