Author: Peter Henderson Andrew Cook Corrie Imrie
Publisher: Taylor & Francis Ltd
ISSN: 0267-8292
Source: Liquid Crystals, Vol.31, Iss.11, 2004-11, pp. : 1427-1434
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
A homologous series of linear liquid crystal trimers, the 4,4-bis[-(4-methoxyazobenzene-4-yloxy)alkoxy]azobenzenes, has been synthesized and characterized. The transitional properties of the trimers are compared with those of the corresponding series of dimers, the ,-bis(4-methoxyazobenzene-4-oxy)alkanes, and monomers, the 4-methoxy-4-alkoxyazobenzenes. Characteristically pronounced odd-even effects were seen for the transitional properties of both dimers and trimers on varying the spacer lengths. The clearing temperatures of the trimers were higher than those of the corresponding dimers, but as the length of the flexible spacers was increased this difference became rather small. The ratios of TNI, and SNI/R for monomer:dimer and dimer:trimer are discussed. These are very similar to reported values for similar materials, suggesting that there may be a rather general relationship between the transitional properties of liquid crystal oligomers as the number of mesogenic units is increased.
Related content
Chemistry of Discotic Liquid Crystals: From Monomers to Polymers
By Cammidge Andrew N. Gopee Hemant
Liquid Crystals Today, Vol. 20, Iss. 4, 2011-10 ,pp. :
Electroluminescent segmented liquid crystalline trimers
By Aldred M. P.
Liquid Crystals, Vol. 35, Iss. 4, 2008-04 ,pp. :
Reminiscences from a life with liquid crystals
By Gray G. W.
Liquid Crystals, Vol. 24, Iss. 1, 1998-01 ,pp. :