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|Type:||Artigo de evento|
|Title:||Poly(alkylmethylsiloxanes) Thermally Immobilized On Silica As Stationary Phases For High-performance Liquid Chromatography|
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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