Format:
Online-Ressource
ISSN:
1521-3935
Content:
Abstract: The synthesis of the liquid‐crystalline polysiloxanes, 4a, 4b, 5a, 5b with 2,7‐disubstituted fluorene units and of the related liquid‐crystalline model compounds 2 and 3 is reported. Polymers 4a, 4b, 5a, 5b were prepared from monomers 2 and 3, respectively, and poly (hydrogenmethyl‐siloxane) (PHMS) in a polymer‐analogous reaction. The liquid‐crystalline properties of the polymers and the corresponding low‐molecular‐weight compounds 2 and 3 were characterized by differential scanning calorimetry (DSC) and polarizing microscopy. Both compounds 2 and 3 show a smectic A and a smectic E mesophase, and the resulting polysiloxanes also exhibit smectic A‐ and smectic E‐like textures but no nematic phase. The clearing point of the polymers is on the average by 100°C higher than that found for the low‐molecular‐weight compounds.
In:
volume:191
In:
number:12
In:
year:2003
In:
pages:3107-3113
In:
extent:7
In:
Macromolecular chemistry and physics, Weinheim : Wiley-VCH, 1947-, 191, Heft 12 (2003), 3107-3113 (gesamt 7), 1521-3935
Language:
English
DOI:
10.1002/macp.1990.021911229
URN:
urn:nbn:de:101:1-2024011606153655341901
URL:
https://doi.org/10.1002/macp.1990.021911229
URL:
https://nbn-resolving.org/urn:nbn:de:101:1-2024011606153655341901
URL:
https://d-nb.info/1316030695/34
URL:
https://doi.org/10.1002/macp.1990.021911229