Abstract
A new side-chain liquid crystalline polysiloxane (SCLCP) having a wide liquid crystalline range of 140°C to 315°C was used as a stationary phase in capillary column gas chromatography. A series of new SCLCPs was synthesized using olefins containing 2,6-disubstituted naphthalene. The olefins were attached to a hydromethylpolysiloxane backbone by a hydrosilylation reaction using a platinum catalyst. Reproducible fused-silica capillary columns were made from the new SCLCP stationary phase. The columns have high thermal stability, efficiency and isomer specificity for the separation of isomeric compounds. The separations on the SCLCP stationary phase column and on a dimethyl (5% phenyl)polysiloxane stationary phase column are compared. The applications of capillary columns made from the new SCLCP for the separation of isomeric polychlorinated dibenzo- p-dioxins, polycyclic aromatic hydrocarbons and pesticides are demonstrated as examples.
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