Thermal decomposition of polyamides in the presence of poly(vinyl chloride)

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Abstract

Thermal decomposition of aliphatic and aromatic polyamides (polyamide-12, polyamide-6,6 and poly(1,4-phenylene terephthalamide) (Kevlar)) with poly(vinyl chloride) (PVC) was examined by pyrolysis-gas chromatography/mass spectrometry. Polyamide-PVC mixtures (typical mass ratio 1:1) were pyrolysed at 700 and 900°C. It was found that the presence of PVC promoted the hydrolytic decomposition routes of amide groups and volatile nitrile formation from all examined polyamides due to the hydrogen chloride eliminated from PVC under pyrolysis. In the presence of PVC an elevated yield of alkenenitriles was observed from polyamide-12. Benzeneamine is produced from Kevlar instead of benzenediamine in the presence of PVC, and the evolution of benzoic acid, benzenenitrile and benzeneisocyanate is promoted. At 900°C pyrolysis temperature enhanced hydrogen cyanide evolution was observed from polyamide-12 and polyamide-6,6 in the presence of PVC. Mechanisms are proposed for the hydrogen chloride assisted formation of nitriles.

Original languageEnglish
Pages (from-to)95-104
Number of pages10
JournalJournal of Analytical and Applied Pyrolysis
Volume58-59
DOIs
Publication statusPublished - Apr 1 2001

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Keywords

  • PVC
  • Polyamides
  • Py-GC/MS
  • Pyrolysis
  • Thermal decomposition

ASJC Scopus subject areas

  • Analytical Chemistry
  • Fuel Technology

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