Chromatographic evaluation of self-immobilized stationary phases for reversed-phase liquid chromatography.
The preparation of stationary phases for HPLC using polymers deposited on silica usually includes an immobilization step involving cross-linking by free radicals induced by ionizing radiation or by other radical initiators. The present paper reports changes which occur at ambient temperature in the character of poly(methyloctylsiloxane) deposited on porous silica particles as a function of the time interval between particle loading and column packing. Column performance and retention factors increase with time and these changes are attributed to rearrangement (self-assembly) which result in "self-immobilization" of the polymer molecules on the silica surface.
Bottoli
Carla B G
CB
LABCROM-Laboratório de Pesquisas em Cromatografia Líquida, Instituto de Química, Universidade Estadual de Campinas, Caixa Postal 6154, CEP 13084-971, Campinas, SP, Brazil.
Collins
Kenneth E
KE
Collins
Carol H
CH
D002851:Chromatography, High Pressure Liquid / Q000295:instrumentation*; D004864:Equipment and Supplies / Q000592:standards*