Self-immobilization and/or thermal treatment for preparing silica-poly(methyloctylsiloxane) stationary phases

A new thermally immobilized fluorinated stationary phase for RP‐HPLC

“…In recent years, several SP were prepared based on pure and metalized silicas, with polymers immobilized by thermal treatment, gamma radiation and microwave irradiation. The polymers include poly(methyloctylsiloxane) 17–23, poly(methyoctadecylsiloxane) 24, polybutadiene 25–28 and poly(methyltetradecylsiloxane) 29–33.…”

Characterization of a new stationary phase based on microwave immobilized polybutadiene on titanium oxide-modified silica

“…Recently, some papers have investigated polymeric coatings on silica with poly(alkylmethysiloxanes) and polybutadiene (PBD). Some of these phases were immobilized by different processes, including thermal treatments [18][19][20], gamma radiation [21][22][23], microwave radiation [24] or induced by radical initiators (peroxide). Others were simply self-immobilized, which means the absence of conventional immobilization procedures [25][26][27].…”

High-performance liquid chromatographic determination of pesticides in tomatoes using laboratory-made NH2 and C18 solid-phase extraction materials

“…However, this method has some limitations, such as: high reagent cost, time consuming synthesis procedure, use of toxic solvents and reagents and the need for an inert atmosphere and high temperatures to carry out the process. An interesting alternative, successfully used to prepare several HPLC stationary phases, such as, poly(methyloctylsiloxane) (PMOS) immobilized onto zirconized silica [6,7], titanium-grafted silica [8,9] and pure silica [10][11][12], is the substitution of the chemical reaction by depositing a polymer on the support and then immobilizing the polymer using a thermal treatment or gamma irradiation. SPE sorbents based on poly(methyloctadecylsiloxane) (PMODS) immobilized onto silica by gamma radiation or thermal treatment have been described [13][14][15] and applied for the pre-concentration of pesticides in grapes, water and urine samples, respectively.…”