Polyaromatization in common synthetic polymers at elevated temperatures

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Thermal decomposition reactions of polyethylene and phenolformaldehyde novolac were studied at 800-1000°C by pyrolysis-gas chromatography/mass spectrometry. The main high temperature products of both polymers are benzene, naphthalene, acenaphthene and phenanthrene; moreover, dibenzofuran and xanthene are also formed from phenolformaldehyde novolac. A high temperature decomposition mechanism is proposed for polyethylene through conjugated polyene formation, aromatic ring closure and fusion. For phenolic novolac several other reactions are considered such as condensation or reduction of phenolic hydroxyl groups, decomposition of phenol rings into carbon monoxide and pentadienylene biradical, and attachment of the biradical to an aromatic ring resulting in bi- and tricyclic aromatic volatiles. High temperature pyrolysis experiments have also been carried out in the presence of some inorganic materials. The effect of additives has been interpreted in terms of promoting or hindering the reactions yielding polyaromatic volatiles. Polyaromatization and condensation are advanced by additives of high surface area (γ-alumina and activated charcoal) and retarded by potassium carbonate, iron, ferric oxide, copper and cupric oxide.

Original languageEnglish
Pages (from-to)25-35
Number of pages11
JournalJournal of Analytical and Applied Pyrolysis
Volume25
Issue numberC
DOIs
Publication statusPublished - 1993

Fingerprint

Polymers
Pyrolysis
Polyethylene
pyrolysis
oxides
Polyethylenes
polyethylenes
Condensation
rings
polymers
Xanthenes
condensation
Decomposition
Polyenes
decomposition
Potash
charcoal
phenanthrene
inorganic materials
Aluminum Oxide

Keywords

  • Effect of additives
  • phenolformaldehyde novolac
  • polyethylene
  • pyrolysis
  • thermal decomposition mechanism.

ASJC Scopus subject areas

  • Analytical Chemistry
  • Physical and Theoretical Chemistry

Cite this

Polyaromatization in common synthetic polymers at elevated temperatures. / Blazso, M.

In: Journal of Analytical and Applied Pyrolysis, Vol. 25, No. C, 1993, p. 25-35.

Research output: Contribution to journalArticle

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