Variation of selectivity among the poly(siloxane) stationary phases for gas chromatography

摘要: The solvation parameter model is used to characterize the solvent properties of 12 poly(siloxane) stationary phases varied structure. Selectivity differences are explained in terms cohesive energy solvents and their capacity for dispersion, dipole-type, hydrogen bonding, electron pair complexation interactions. None exhibited significant hydrogen-bond acid character. Principal component analysis indicates that replacing a methyl group by phenyl backbone predominantly produces incremental increases phase dipole-type interactions (up about 50 mol% groups with only small changes at higher composition). poly(methylphenylsiloxanes), however, span sector selectivity space provide limited opportunities optimization. OV—275 QF-1 identified as important unique characteristics—OV-275 because its high great base unusually basicity an intermediate well low n- π-electron From these studies it possible speculate on needs new explore full potential gas chromatography address issue temperature relationship selectivity. © 1995 John Wiley & Sons, Inc.