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Analysis of Synthetic Polymers and Copolymers by Pyrolysis- Gas Chromatography/Mass Spectrometry
(2005)
Structural analysis and the study of degradation properties are important in order to understand and improve performance characteristics of synthetic polymers and copolymers in many industrial applications. Polymers/copolymers are inherently difficult to analyze because of their high molecular weight and lack of volatility. Traditionally, various analytical techniques are used to characterize polymers/copolymers including physical testing (rheological testing), thermogravimetric analysis (TGA), electron microscopy, Fourier transform infrared (FTIR) spectroscopy, size-exclusion chromatography (SEC)/gel permeation chromatography (GPC), and mass spectrometry (MS). Often, time consuming sample preparation, including hydrolysis, dissolution, or derivatization is needed before analysis.
Headspace-SPME-GC-MS identification of volatile organic compounds released from expanded polystyrene
(2004)
Gas chromatography with flame-ionization detection (FID) and gas chromatography-mass spectrometry (GC/MS) has been used for structure elucidation of long-chain primary n-alkyl amines after derivatization with trifluoroacetic anhydride (TFAA). Electron impact ionization- (EI) and positive chemical ionization- (PCI) mass spectra of trifluoroacetylated derivatives of the identified nalkyl amines are presented. The corrosion inhibiting n-alkyl amines were applied in the investigation of a new anticorrosive and antifouling formulation for water-steam circuit of energy systems in the power industry. The presented results are part of an EU-funded international collaboration with partners from research institutes and industry from Poland, Lithuania, Romania, France and Germany (EUREKA project BOILTREAT E!2426).
Die analytische Pyrolyse ist eine universell einsetzbare Messtechnik zur Untersuchung von hoch molekularen organischen Verbindungen. Bei der Pyrolyse der hochmolekularen organischen Ver bindungen entstehen durch thermische Zersetzung bei 500-1400°C in einem Inertgasstrom nieder molekulare Verbindungen. Diese niedermolekularen Pyrolyse-Produkte werden dann den her kömmlichen Analyseverfahren wie GC-FID, GC/MS oder GC/FTIR unterworfen, die Rück schlüsse auf chemische Zusammensetzung und Struktur der Ausgangsstoffe erlauben. Die Festphasen mikroextraktion (SPME) ist eine lösungsmittelfreie Mikroextraktionstechnik. Im Headspace-Modus (HS) wurde SPME in den letzten Jahren für die Bestimmung von Rest mono meren und gesund heits gefährdenden, leichtflüchtigen organischen Verbindungen (VOCs) in Kunststoffen verwendet.