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Dielectric studies of a laterally-linked siloxane ester dimer

Dielectric studies of a laterally-linked siloxane ester dimer
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. 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.
cores
1366-5855
1021-1030
Diez, Sergio
7ecb993c-5364-4b32-9503-924960884c79
Dunmur, David A.
32f38d73-7498-4e86-a216-29735cd1ea39
De la Fuente, M. Rosario
b881f5cb-2eba-4db2-97c2-eca963283d58
Karahaliou, Panagiota K.
f1c01cd2-aedf-4235-a81e-2da3687d3bdb
Mehl, Georg
08c29ed5-65a3-4922-94fa-4ffa4734f4a1
Meyer, Thomas
4a0e4eda-5fbc-4352-aa2f-cec35570bf51
Jubindo, Miguel Ángel Peréz
c28a3acd-1563-4162-b0d3-ad3a989f46aa
Photinos, Demetri J.
440fbb1f-1052-406a-bd13-723fc1c6beb8
Diez, Sergio
7ecb993c-5364-4b32-9503-924960884c79
Dunmur, David A.
32f38d73-7498-4e86-a216-29735cd1ea39
De la Fuente, M. Rosario
b881f5cb-2eba-4db2-97c2-eca963283d58
Karahaliou, Panagiota K.
f1c01cd2-aedf-4235-a81e-2da3687d3bdb
Mehl, Georg
08c29ed5-65a3-4922-94fa-4ffa4734f4a1
Meyer, Thomas
4a0e4eda-5fbc-4352-aa2f-cec35570bf51
Jubindo, Miguel Ángel Peréz
c28a3acd-1563-4162-b0d3-ad3a989f46aa
Photinos, Demetri J.
440fbb1f-1052-406a-bd13-723fc1c6beb8

Diez, Sergio, Dunmur, David A., De la Fuente, M. Rosario, Karahaliou, Panagiota K., Mehl, Georg, Meyer, Thomas, Jubindo, Miguel Ángel Peréz and Photinos, Demetri J. (2003) Dielectric studies of a laterally-linked siloxane ester dimer. Liquid Crystals, 30 (9), 1021-1030. (doi:10.1080/0267829031000152969).

Record type: Article

Abstract

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.

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Published date: 2003
Keywords: cores

Identifiers

Local EPrints ID: 19945
URI: https://eprints.soton.ac.uk/id/eprint/19945
ISSN: 1366-5855
PURE UUID: bc09a61f-0a00-4a77-94d7-0eba7aea8fff

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Date deposited: 24 Feb 2006
Last modified: 15 Jul 2019 19:26

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Contributors

Author: Sergio Diez
Author: David A. Dunmur
Author: M. Rosario De la Fuente
Author: Panagiota K. Karahaliou
Author: Georg Mehl
Author: Thomas Meyer
Author: Miguel Ángel Peréz Jubindo
Author: Demetri J. Photinos

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