Liquid-crystalline side group polyesters with definite lengths of flexible spacers in the main chain

Liquid‐crystalline polymalonates with a definite distance between the contact points of two neighbouring side groups were synthesized. The mesogenic group is azobenzene with a terminal nitro‐substituent acting as an indicator for dielectric measurements. The influence of the number of methylene grou...

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Bibliographic Details
Published in:Die Makromolekulare Chemie 1993-12, Vol.194 (12), p.3341-3348
Main Authors: Böhme, Axel, Novotna, Eva, Kresse, Horst, Kuschel, Frank, Lindau, Jürgen
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Thermal and thermodynamic properties
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Summary:Liquid‐crystalline polymalonates with a definite distance between the contact points of two neighbouring side groups were synthesized. The mesogenic group is azobenzene with a terminal nitro‐substituent acting as an indicator for dielectric measurements. The influence of the number of methylene groups in the main chain on the polymorphism and the dielectric behaviour has been investigated. Generally, the thermal stability of the mesophases decreases when the main chain spacer becomes longer. The relaxation frequency for the reorientation of the mesogenic side group around the short axis increases with increasing number of methylene groups in the main chain in both, the isotropic and liquid‐crystalline phases.
ISSN:0025-116X
0025-116X
DOI:10.1002/macp.1993.021941212