title: High-performance liquid chromatographic stationary phases based on poly(methyloctylsiloxane) immobilized on silica. I. Physical and chemical characterizations.
abstract: Five different reversed-phase materials for high-performance liquid chromatography were obtained by deposition of poly(methyloctylsiloxane) in HPLC silica particles, followed by immobilization using different processes: thermal treatment (120 or 220 degrees C for 4 h), irradiation with microwaves (495 W for 15 min), gamma radiation (dose of 80 kGy) and self-immobilization. These phases were characterized by gel permeation chromatography, percent carbon, 13C and 29Si solid-state nuclear magnetic resonance spectroscopy, infrared spectroscopy, thermogravimetric analysis and scanning electron microscopy. The results show that the different immobilization processes produce different physical characteristics in the prepared phases.
authors.affiliation: Instituto de Química, Universidade Estadual de Campinas, Caixa Postal 6154, 13083-970 Campinas, SP, Brazil.
authors.forename: Edivan
authors.initials: E
authors.lastname: Tonhi
authors.forename: Stefan
authors.initials: S
authors.lastname: Bachmann
authors.forename: Klaus
authors.initials: K
authors.lastname: Albert
authors.forename: Isabel C S F
authors.initials: IC
authors.lastname: Jardim
authors.forename: Kenneth E
authors.initials: KE
authors.lastname: Collins
authors.forename: Carol H
authors.initials: CH
authors.lastname: Collins
mesh_terms: D002247:Carbon Isotopes; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D007554:Isotopes; D009682:Magnetic Resonance Spectroscopy; D008855:Microscopy, Electron, Scanning; D011108:Polymers / Q000737:chemistry*; D012825:Silicon; D012822:Silicon Dioxide; D012833:Siloxanes / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013696:Temperature; D013818:Thermogravimetry
chemical_list: D002247:Carbon Isotopes; D007554:Isotopes; D011108:Polymers; D012833:Siloxanes; C475630:poly(methyloctylsiloxane); D012822:Silicon Dioxide; D012825:Silicon