Side chain functionalized liquid crystalline polymers and blends, 1 - Reentrant nematic phase formation in hydrogen-bonded blends of liquid crystalline functionalized copolymers with a low molecular weight non-mesogenic dopant

Hydrogen-bonded blends based on smectic comb-shaped functionalized LC copol ymers containing alkyloxy-4-hydroxybenzoic acid fragments (proton donor) an d the low molecular weight dopant 4-(4-pyridyloyl)cyanobenzoate (proton acc eptor) were obtained. It was observed that blends containing 10-25 mol-% of low molecular weight dopants form a reentrant nematic phase (SmA-RN-SmA-I) . The blend behavior in the magnetic field was studied, and the orientation al elastic constants of the RN phase were determined.