Monitored Photooxidation of Polypropylene Nonwovens
The photooxidation of polypropylene has been extensively investigated by a variety of techniques (primarily infrared spectroscopy and electron spin resonance) to elucidate the mechanisms by which this photooxidation occurs.1 As with most polymers, hydroperoxides have been found to photosensitive effectively the degradation and cause chain scission and the formation of various decomposition products containing carbonyl and alkene functional groups.2 Most studies however, have focused on the volatile degradation products formed from polypropylene at high temperatures (usually greater than 200°C) utilizing gas chromatography, and in some instances, mass spectrometry.3 The studies that have addressed the polypropylene residue have been primarily concerned with functional group analysis by infrared spectroscopy and/or chemical techniques.1 This study provides additional information on the photooxidation mechanism of polypropylene utilizing mass spectrometry to examine the nature of the volatile products liberated from the polymer residue (before and after ultraviolent exposure) at different temperatures, in conjunction with changes in various functional carbonyl groups and in the mechanical properties of the nonwoven polypropylene fabrics.
KeywordsElectron Spin Resonance Methylene Blue Nonwoven Fabric Carboxyl Content Functional Group Analysis
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