Abstract：
:The thermal decomposition of polyethylene glycol was investigated by using a technique combining evolved gas analysis (time-resolved pyrolysis) with ion-attachment mass spectrometry. This technique allows the detection of intact pyrolysis products and, therefore, offers the opportunity for direct real-time monitoring of thermal by-products. Unstable products can thus be detected; for instance, many highly reactive organic peroxides, such as CH(3)OOH and HOCH(2)OOH, were found in this study. Classification analysis revealed 10 major compositional formulas among the product species: C(n)H(2)(n)(+2)O, C(n)H(2)(n)(+2)O(2), C(n)H(2)(n)(+2)O(3), C(n)H(2)(n)(+2)O(4), C(n)H(2)(n)(+2)O(5), C(n)H(2)(n)(+2)O(6), C(n)H(2)(n)(+2)O(7), C(n)H(2)(n)O, C(n)H(2)(n)O(2), and HO(CH(2)CH(2)O)(n)H ethylene glycol oligomers. The Li(+) ion adduct mass spectra showed a characteristic profile in terms of both the appearance of unique components and the distribution of pyrolysis products. Among the products of the thermal decomposition of PEG, formaldehyde (HCHO) and organic peroxides were particularly interesting. Formaldehyde, one of the 10 most abundant products, is a known human carcinogen. The detection of peroxides suggests that they may form during the incineration of PEG, which may have important environmental implications. The existence of peroxide products may have implications for chemical evolution in incinerator systems.
journal_name
Chemospherejournal_title
Chemosphereauthors
Kitahara Y,Takahashi S,Fujii Tdoi
10.1016/j.chemosphere.2012.03.054subject
Has Abstractpub_date
2012-07-01 00:00:00pages
663-9issue
5eissn
0045-6535issn
1879-1298pii
S0045-6535(12)00406-7journal_volume
88pub_type
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