Radiation–oxidation mechanisms: Volatile organic degradation products from polypropylene having selective C-13 labeling studied by GC/MS

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

“…It is thus possible to differentiate two compounds of the same nominal molecular mass, but with different exact masses (Table 1). For instance, the peak here observed at 72 g/mol must be assigned to acrylic acid instead of butanone [4,7] or 2methyl-2-propen-1-ol [6,8] as previously reported in the literature. For sake of simplicity, six main VOCs, each representing more than 5 mol% of the total amount of VOCs, are considered in this study (Table 1).…”

“…Analysis of Volatile Organic Compounds (VOCs) emitted during degradation of polypropylene (PP) has been widely studied during the last three decades under various exposure conditions such as photo-oxidation [1][2][3], radiooxidation [4][5][6] and thermal oxidation in both solid and molten states [7][8][9][10][11][12][13][14]. Many VOCs were identified, particularly in thermal oxidation by Hoff et al [15] or more recently by Bernstein et al [8].…”

“…Identification and quantification of VOCs brought valuable information about the prevailing mechanisms of polypropylene oxidation, consistent with their precursory macromolecular oxidation products [1,[3][4][5]7,16,17]. VOCs analysis was particularly applied to the determination of the relative sensitivities to oxidation of methyne and methylene -besides methyl-units to oxidation [8].…”

Identification of volatile butyl rubber thermal-oxidative degradation products by cryofocusing gas chromatography/mass spectrometry (cryo-GC/MS).

“…In the future, the headspace above these materials will be sampled; the degradation species will be characterized; and comparisons will be drawn to samples presented in this manuscript. In addition, these results and those for other polymers can be compared to compounds of interest to the DOE complex that have already been studied by this group: polyethylene [18,19], polypropylene [20][21][22], nylon 6.6 [23][24][25][26], and poly(ethylene-co-vinyl acetate). This information may identify common degradation products and therefore degradation pathways amongst WR materials.…”

Elektroneninduzierte reaktive Aufbereitung von Polypropylen/Ethylen-Octen Copolymer Blends – eine neue Methode zur Herstellung zähmodi-fizierten Polypropylens

“…Die Polymermodifizierung mit energiereichen Elektronen wird beispielsweise zur Vernetzung [7 -9] sowie zur Funktionalisierung [10] und dem Abbau von Polymeren [11] …”