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Type: Artigo de periódico
Title: Poly(alkylmethylsiloxanes) Thermally Immobilized On Silica As Stationary Phases For High-performance Liquid Chromatography.
Author: Bottoli, Carla B G
Chaudhry, Zahra F
Fonseca, Dania A
Collins, Kenneth E
Collins, Carol 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 degrees 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 degrees C while the longer chain (PMODS) phase gave satisfactory HPLC phases following thermal immobilizations at 80 and 100 degrees C. Stability evaluation for the PMOS and PMODS columns immobilized at 100 degrees C required 250 ml of pH 8.5 mobile phase at 60 degrees C to significantly decrease efficiency, suggesting a long useful life time at neutral pH and ambient temperature.
Subject: Algorithms
Chemistry, Physical
Chromatography, High Pressure Liquid
Physicochemical Phenomena
Silicon Dioxide
Citation: Journal Of Chromatography. A. v. 948, n. 1-2, p. 121-8, 2002-Mar.
Rights: fechado
Identifier DOI: 
Date Issue: 2002
Appears in Collections:Unicamp - Artigos e Outros Documentos

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