Dielectric studies of a laterally-linked siloxane ester dimer

This paper reports measurements of the dielectric response over the frequency range 10 2 to 10 9  Hz of a liquid crystal dimer consisting of two ester mesogens laterally linked by an alkoxy chain containing a siloxane group. The synthesis and phase behaviour of the siloxane dimer are also reported....

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Published inLiquid crystals Vol. 30; no. 9; pp. 1021 - 1030
Main Authors Diez, Sergio, Dunmur, David A., Rosario De La Fuente, M., Karahaliou, Panagiota K., Mehl, Georg, Meyer, Thomas, Ángel PerÉz Jubindo, Miguel, Photinos, Demetri J.
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group 01.09.2003
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Summary:This paper reports measurements of the dielectric response over the frequency range 10 2 to 10 9  Hz of a liquid crystal dimer consisting of two ester mesogens laterally linked by an alkoxy chain containing a siloxane group. The synthesis and phase behaviour of the siloxane dimer are also reported. Results show that there are two relaxations in the isotropic phase and four in the nematic phase of the material. The possible molecular origins for these modes are given. It is found that there is a coupling between internal and external modes which gives rise to a cooperative mode as the temperature in the nematic phase is lowered towards a glass transition.
ISSN:0267-8292
1366-5855
DOI:10.1080/0267829031000152969