A. P. Filippov*2, V. V. Andropov* , E. B. Barmatov** , and V. P. Shibaev**
* Institute of Macromolecular Compounds, Russian Academy of Sciences,
Bol’shoi pr. 31, St. Petersburg, 199004 Russia
** Department of Chemistry, Moscow State University,
Vorob’evy gory, Moscow, 119899 Russia
Received July 10, 2000;
Revised Manuscript Received September 7, 2000
Abstract—The hydrogen bonding, magnetooptical characteristics, and orientational-elastic properties of liq-
uid-crystalline (LC) blends of modified comb-shaped copolymers with nonmesogenic low-molecular-mass
pyridine-containing additives were studied by methods of IR absorption spectroscopy and Fréedericksz thresh-
old transitions. The temperature variation of the optical birefringence and the orientational elasticity constants
was determined. It is established that the order parameter S of the hydrogen-bonded LC polymer blends
decreases with increasing additive concentration. An increase in the dopant concentration leads to a growth in
the fraction of strongly anisometric mesogenic groups formed by hydrogen-bonded acid groups of the copoly-
mer and pyridine cycles of the additive, which results in an increase in the ratio K3/K1 of the elastic constants
for the longitudinal and transverse bending.
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