NEW NAPHTHALENE CONTAINING SIDE-CHAIN LIQUID-CRYSTALLINE POLYSILOXANESTATIONARY PHASES FOR HIGH-RESOLUTION GAS-CHROMATOGRAPHY

A new side-chain liquid crystalline polysiloxane (SCLCP) having a wide liquid crystalline range of 140 degrees C to 315 degrees C was used a s a stationary phase in capillary column gas chromatography. A series of new SCLCPs was synthesized using olefins containing 2,6-disubstitut ed naphthalene. The olefins were attached to a hydromethylpolysiloxane backbone by a hydrosilylation reaction using a platinum catalyst. Rep roducible 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 s eparations on the SCLCP stationary phase column and on a dimethyl (5% phenyl)polysiloxane stationary phase column are compared. The applicat ions of capillary columns made from the new SCLCP for the separation o f isomeric polychlorinated dibenzo-p-dioxins, polycyclic aromatic hydr ocarbons and pesticides are demonstrated as examples. (C) 1998 Elsevie r Science B.V. All rights reserved.