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Type: Artigo de evento
Title: Poly(alkylmethylsiloxanes) Thermally Immobilized On Silica As Stationary Phases For High-performance Liquid Chromatography
Author: Bottoli C.B.G.
Chaudhry Z.F.
Fonseca D.A.
Collins K.E.
Collins C.H.
Abstract: Poly(methyloctylsiloxane) (PMOS) and poly(methyloctadecylsiloxane) (PMODS) were sorbed onto porous HPLC silica and thermally immobilized, in the absence of radical initiators, at temperatures in the range of 80 to 180°C. Following extraction of non-immobilized polymer the materials were packed into columns and their chromatographic properties evaluated. The shorter chain (PMOS) stationary phase showed good HPLC characteristics after thermal immobilizations up to 120°C while the longer chain (PMODS) phase gave satisfactory HPLC phases following thermal immobilizations at 80 and 100°C. Stability evaluation for the PMOS and PMODS columns immobilized at 100°C required 250 ml of pH 8.5 mobile phase at 60°C to significantly decrease efficiency, suggesting a long useful life time at neutral pH and ambient temperature. © 2002 Elsevier Science B.V. All rights reserved.
Rights: fechado
Identifier DOI: 10.1016/S0021-9673(01)01316-4
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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