title: Selective separation of fluorinated compounds from complex organic mixtures by pyrolysis-comprehensive two-dimensional gas chromatography coupled to high-resolution time-of-flight mass spectrometry.
abstract: The usefulness of comprehensive two-dimensional gas chromatography (GC×GC) was demonstrated for the selective separation of fluorinated compounds from organic mixtures, such as kerosene/perfluorokerosene mixtures, pyrolysis products derived from polyethylene/ethylene-tetrafluoroethylene alternating copolymer mixture and poly[2-(perfluorohexyl)ethyl acrylate]. Perfluorocarbons were completely separated from hydrocarbons in the two-dimensional chromatogram. Fluorohydrocarbons in the pyrolysis products of polyethylene/ethylene-tetrafluoroethylene alternating copolymer mixture were selectively isolated from their hydrocarbon counterparts and regularly arranged according to their chain length and fluorine content in the two-dimensional chromatogram. A reliable structural analysis of the fluorohydrocarbons was achieved by combining effective GC×GC positional information with accurate mass spectral data obtained by high-resolution time-of-flight mass spectrometry (HRTOF-MS). 2-(Perfluorohexyl)ethyl acrylate monomer, dimer, and trimer as well as 2-(perfluorohexyl)ethyl alcohol in poly[2-(perfluorohexyl)ethyl acrylate] pyrolysis products were detected in the bottommost part of the two-dimensional chromatogram with separation from hydrocarbons possessing terminal structure information about the polymer, such as α-methylstyrene. Pyrolysis-GC×GC/HRTOF-MS appeared particularly suitable for the characterization of fluorinated polymer microstructures, such as monomer sequences and terminal groups.
authors.affiliation: Asahi Glass Co., Ltd, Japan. Electronic address: youji-nakajima@agc.com.
authors.forename: Yoji
authors.initials: Y
authors.lastname: Nakajima
authors.affiliation: Asahi Glass Co., Ltd, Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Arinami
authors.affiliation: Asahi Glass Co., Ltd, Japan.
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Yamamoto
mesh_terms: D017611:Fluorine Compounds / Q000737:chemistry / Q000302:isolation & purification*; D008401:Gas Chromatography-Mass Spectrometry / Q000379:methods*; D006838:Hydrocarbons / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D013997:Time Factors
chemical_list: D017611:Fluorine Compounds; D006838:Hydrocarbons; D011108:Polymers
keywords: Comprehensive two-dimensional gas chromatography; Fluorinated compound; Polymer; Pyrolysis; Time-of-flight mass spectrometry