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Real-time quantitative analysis of volatile products generated during solid-state polypropylene thermal oxidation

Article dans une revue avec comité de lecture
Author
FRANCOIS-HEUDE, Alexandre
LEPROVOST, Julien
HENINGER, Michel
1175 Laboratoire de Chimie Physique D'Orsay [LCPO]
MESTDAGH, Helene
1175 Laboratoire de Chimie Physique D'Orsay [LCPO]
DESNOUX, Eric
ccCOLIN, Xavier
86289 Laboratoire Procédés et Ingénierie en Mécanique et Matériaux [PIMM]
ccRICHAUD, Emmanuel

URI
http://hdl.handle.net/10985/8098
DOI
10.1016/j.polymertesting.2013.04.008
Date
2013
Journal
Polymer Testing

Abstract

Analysis of volatile organic compounds (VOCs) during PP thermal oxidation under three oxygen partial pressures (0%, 21% and 100% of atmospheric pressure) at 140 C was performed by proton transfer reaction coupled with Fourier transform ion cyclotron resonance mass spectrometry. Six main VOCs were identified: acetone, acetic acid, 2,4- pentanedione, acetaldehyde, formaldehyde and methyl acrolein. Their formation was shown to obey two main reaction pathways, both involving methyne units as driving oxidation sites: (i) the widely accepted chain scission mechanism of tertiary alkoxy radicals, which generates primary radicals undergoing secondary reactions leading to the oxidation of methylene units; (ii) the chain scission mechanism occurring on tertiary alkyl radical, which is proposed here as a realistic path leading to methyl acrolein. The relative proportions of the six main VOCs depend on the oxygen partial pressure, which mostly impacts the oxidation of methylene units rather than the competition between the two previous paths.

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