| Autor: |
Filippov, A. P., Andropov, V. V., Barmatov, E. B., Kremer, F., Barmatova, M. V., Shibaev, V. P. |
| Předmět: |
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| Zdroj: |
Liquid Crystals; Dec2000, Vol. 27 Issue 12, p1585-1593, 9p |
| Abstrakt: |
New hydrogen bonded blends of LC copolymers containing functional carboxyl groups with a low molecular mass pyridine-containing dopant were obtained and the orientational, optical and elastic properties of the blends were measured using the Fréedericksz method of threshold transitions in a magnetic field. The averaged order parameter S of the hydrogen bonded blends is found to be lower than that of the initial functionalized LC polymers. Furthermore, a considerable increase in the K[sub 3]/K[sub 1] ratio is observed caused by an increment in the average 'effective' length of the hydrogen bonded mesogenic group. For the first time it is proven that LC blends with hydrogen bonded mesogenic groups obey the same main relationship of orientational elastic deformations as common nematic LC polymers with covalent bonding of mesogenic side groups. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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