Document Type
Article
Publication Date
8-1-1998
Department
Chemistry and Biochemistry
School
Mathematics and Natural Sciences
Abstract
Magnetically induced Freedericksz measurements were performed in the nematic liquid crystal phase to extract the elastic constants of a terminal-lateral-lateral-terminal trimer, i.e., a trimer in which the connections to the first and third mesogens are at the end of the mesogen and both attachments to the central mesogen are lateral. Polymeric liquid crystals based on this unit have negative Poisson ratios. Additionally, electric field Kerr measurements were performed in the isotropic phase to extract the orientational susceptibility. The elastic constants were found to be similar to values obtained for typical monomers, albeit with a slightly enhanced ratio K-33/K-11 and reduced ratio K-11/K-22 especially near the transition temperature. The temperature dependence of the susceptibility was found to deviate significantly from that of typical monomers. The observed behavior is discussed in terms of coupled order parameters representing the terminal and core mesogens of the molecule.
Publication Title
Physical Review E
Volume
58
Issue
2
First Page
2041
Last Page
2046
Recommended Citation
Kang, D.,
Mahajan, M. P.,
Petschek, R. G.,
Rosenblatt, C.,
He, C.,
Lu, P.,
Griffin, A.
(1998). Orientational Susceptibility and Elastic Constants Near the Nematic-Isotropic Phase Transition for Trimers with Terminal-Lateral-Lateral-Terminal Connections. Physical Review E, 58(2), 2041-2046.
Available at: https://aquila.usm.edu/fac_pubs/5063
Comments
©Physical Review E
Originally published in Physical Review E Volume 58, Number 2