Chemical ionization mass spectrometry and gas chromatographic identification of some nitrogen-containing volatile compounds from large-scale pyrolysis of poly (acrylonitrile-butadiene-styrene) plastics
✍ Scribed by Michael M. Shapi; Marja-Liija Riekkola
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 636 KB
- Volume
- 4
- Category
- Article
- ISSN
- 1040-7685
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✦ Synopsis
Abstract
A number of volatile pyrolyzates of large‐scale thermolysis of ABS and SAN plastics, which include phenyl substituted aliphatic nitriles and dinitriles, have been tentatively identified by GC‐MS. The exact isomers of most of these compounds have, however, not been specified, owing to limitations of 70 eV electron ionization (EI) mass spectrometry and temperature‐programmed retention indices in the absence of model compounds. In this study, some of the isomeric forms of these compounds were clarified using chemical ionization (CI) mass spectrometry and capillary gas chromatography (GC) involving model compounds. The presence of phenylacetonitrile, 2‐phenylpropanenirile, 3‐phenylpropanenitrile, trans‐3‐phenyl‐2‐propenenitrile, and 4‐phenylbutanenitrile among the pyrolyzates was confirmed by GC. Isobutane and methane CI of the nitriles yielded intense MH^+^ and adduct ions of low to medium intensity. Most of the smaller phenyl substituted nitriles tended to fragment by loss of 27 mass units, attributed to HCN. Isobutane CI of the larger molecules produced more fragmentation than methane CI which yielded little or no fragmentation. The reliability of the CI spectra was limited to the role of providing molecular formula information and some indirect evidence for the presence of the nitrile group in the molecules.