Two new liquid crystalline polysiloxanes with very wide mesomorphic temperature range have been prepared. One containing 4-[(S)-2-methyl- l-butoxy]phenyl 4-hexanyloxy-biphenyl-4′-carboxylate side groups displays enantiotropic smectic A, chiral smectic C and smectic B phases. The other containing (S)-2-methyl-1-butyl 6-(4-undecanyloxybiphenyl-4′-carbonyloxy)-2-naphthalenecarboxylate side groups exhibits only an enantiotropic cholesteric phase. Both mesomorphic polysiloxanes were used as stationary phases in gas chromatography capillary columns. They show very unique separating properties for various isomeric halogenated naphthalene compounds, methylanthracene compounds, fatty acid methyl esters and polycyclic aromatic compounds.
- Gas chromatography
- Liquid crystal stationary phases
- Liquid crystalline polymers
- Mesomorphic polysiloxanes