Abstract
Two commercial samples of poly(methylphenylsiloxane) were characterised using our salvation equation, log L = c + rR 2 + sπ 2 H + aα 2 H + bβ 2 H + l log L 16 where L is the gas-liquid partition coefficient for a series of solutes on a given stationary phase, and the explanatory variables are R 2 an excess molar refraction, π 2 H the solute dipolarity/polarisability, α 2 H and β 2 H the solute hydrogen-bond acidity and basicity, and log L 16 where L 16 is the solute gas-liquid partition coefficient on hexadecane at 25°C. For both samples, a substantial b- constant was found, viz. 1.22 ± 0.07 and 0.49 ± 0.08 at 25°C, suggesting that they can act as hydrogen-bond acid (contrary to their chemical formulation). Examination of the bulk liquid stationary phases by IR showed the presence of OH groups and confirmed our analysis by the solvation equation. It is suggested that workers using the OV or SE series of siloxanes routinely check the bulk stationary phases by IR in order to assess the presence or absence of OH groups.
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