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|Type:||Artigo de evento|
|Title:||Titanized Silica-based Stationary Phases Prepared With Thermally And Microwave-immobilized Poly(methyloctylsiloxane)|
|Abstract:||Silica supports having their surface modified with titanium oxide were prepared and coated with poly(methyloctylsiloxane) (PMOS). Subsequently, immobilization of the polysiloxane was induced by thermal treatment or microwave radiation. The thermal treatment was carried out for different times (4, 8, 16 and 24h) at temperatures ranging between 100 and 220°C. For PMOS immobilization by microwave radiation, 452, 520 and 586W power levels and exposure times of 5, 15 and 30min were used. After extraction of non-immobilized polymer, the chromatographic properties of the phases were evaluated. The phase immobilized at 120°C for 8h presented the best chromatographic parameters, suggesting that the quantity of acidic hydroxyl groups on the support surface was reduced, resulting in fewer undesirable interactions of a basic solute with the silanols not removed or covered on the support surface. © 2003 Elsevier B.V. All rights reserved.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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