Title of article :
Self-immobilization of poly(methyloctylsiloxane) on high-performance liquid chromatographic silica
Author/Authors :
Collins، نويسنده , , Kenneth E. and Bottoli، نويسنده , , Carla B.G. and Vigna، نويسنده , , Camila R.M. and Bachmann، نويسنده , , Stefan and Albert، نويسنده , , Klaus and Collins، نويسنده , , Carol H.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2004
Abstract :
Poly(methyloctylsiloxane) (PMOS) was deposited on HPLC silica by a solvent evaporation procedure and this material was then extracted, using a good solvent for the PMOS, after different time periods, to remove unretained liquid polymer. Solvent extraction data reveal changes which occur at ambient temperature as a function of the time interval between particle loading and extraction. The quantity of PMOS remaining on the silica after extraction, as determined by elemental analysis for carbon, is attributed to strongly adsorbed polymer. This phenomenon is termed self-immobilization. Solid-state 29Si NMR spectra indicate the formation of a silicon species with a different chemical shift than the original PMOS. These new signals are attributed to a combination of different adsorbed and chemically bonded groups.
Keywords :
Stationary phases , Self-immobilization , nuclear magnetic resonance spectroscopy , Poly(methyloctylsiloxane) , LC
Journal title :
Journal of Chromatography A
Journal title :
Journal of Chromatography A