| Numéro |
J. Phys. II France
Volume 2, Numéro 5, May 1992
|
|
|---|---|---|
| Page(s) | 1237 - 1245 | |
| DOI | https://doi.org/10.1051/jp2:1992196 | |
J. Phys. II France 2 (1992) 1237-1245
A distinct smectic C 2 liquid crystal observed in main-chain liquid crystalline polymer
Junji Watanabe and Satoshi KinoshitaDepartment of Polymer Chemistry, Tokyo Institute of Technology, Ookayama, meguro-ku, Tokyo 152, Japan
(Received 16 September 1991, revised 9 December 1991, accepted 7 January 1992)
Abstract
We present experimental evidence for the formation of a smectic C
2(S
) phase in main-chain liquid crystalline polymers with the general repeat unit,
(see the PDF version). The S
phase was identified by definitive observation using X-ray and optical methods and found to have a novel layered structure.
The mesogenic groups in this phase are titled with respect to the layer normal, but unlike the S
phase the tilt direction is opposite in adjacent layers. This distinct structure is considered to arise from a coupling of
polymeric and mesogenic effects in which the spatial orientation of mesogenic groups is controlled by the confined conformation
of the polymer chain.
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