Thermal decomposition of photooxidized isotactic polypropylene

Zs Czégény, E. Jakab, A. Víg, B. Zelei, M. Blazsó

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Abstract

Thermal decomposition of photooxidized isotactic polypropylene (iPP) samples were studied using analytical pyrolysis and thermal analysis techniques. It was found by thermogravimetry/mass spectrometry that the photooxidation decreases the thermal stability of the iPP. Oxygen-containing compounds are released over the range 100-300 °C from the photooxidized iPP matrix. The beginning and the maximal rate of the decomposition are shifted to lower temperatures with the advancement of the oxidation of the iPP, however, the composition of the oligomer mixture formed did not change significantly. Detailed analysis of the volatile products was performed by pyrolysis-mass spectrometry and pyrolysis-gas chromatography/mass spectrometry. Volatile photo- and the thermal decomposition products have been identified, some of them not yet reported. Mechanisms for their formation are proposed.

Original languageEnglish
Pages (from-to)229-242
Number of pages14
JournalJournal of Analytical and Applied Pyrolysis
Volume56
Issue number2
DOIs
Publication statusPublished - Nov 2000

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ASJC Scopus subject areas

  • Analytical Chemistry
  • Fuel Technology

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