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Proceedings Paper

Depression of mesophase stability caused by polymerization
Author(s): A. Jacobi; G. Pirwitz; Wolfgang Weissflog
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Paper Abstract

Side-on polysiloxanes bearing laterally branched mesogens were synthesized. The mesogens have a bulky lateral branch containing an aromatic ring with an alkenyl chain in para- position, which enables a coupling to the polysiloxane backbone. Surprisingly, reaction with poly-H-siloxane can cause increasing or decreasing of the clearing temperatures. The dimension of the mesophase destabilization was found to be up to 27 K. By systematic investigations of this unusual effect we could prove a clear dependence on steric proportions. Especially, the relation of the length of the terminal alkyl chains R1 and the length n of the flexible aliphatic spacer is of influence.

Paper Details

Date Published: 1 January 1998
PDF: 7 pages
Proc. SPIE 3319, Liquid Crystals: Chemistry and Structure, (1 January 1998); doi: 10.1117/12.301295
Show Author Affiliations
A. Jacobi, Martin Luther Univ. (Germany)
G. Pirwitz, Martin Luther Univ. (Germany)
Wolfgang Weissflog, Martin Luther Univ. (Germany)

Published in SPIE Proceedings Vol. 3319:
Liquid Crystals: Chemistry and Structure
Marzena Tykarska; Roman S. Dabrowski; Jerzy Zielinski, Editor(s)

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