Dynamic properties of some polymer nematics were investigated by Freedericksz transition methods in a magnetic field. The linear aromatic polyester, comblike combined side/chain-main/chain polymer and comblike copolymers with mesogenic and functional acid groups in side chains were studied. The temperature dependences of the effective rotation viscosity (gamma) ₁* were obtained. At close molecular weight and temperature the (gamma) ₁* value for linear polymer exceeds that for comblike combined polymer. Therefore, the existence of side mesogenic groups decreases the velocity of the orientational processes of polymer nematic. However, the highest values of effective rotation viscosity were obtained for the nematic phase of the comblike functionalized copolymers. Hence, the formation of hydrogen bonds in these copolymer leads to slowing of orientational processes. Influence of the intermolecular hydrogen bonds on dynamic properties of functionalized copolymers is stronger than that of intramolecular hydrogen bonds.

Date Published: 27 June 2002
PDF: 8 pages
Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); doi: 10.1117/12.472194

Published in SPIE Proceedings Vol. 4759:
XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications
Jolanta Rutkowska; Stanislaw J. Klosowicz; Jerzy Zielinski, Editor(s)