The effects of heat and mass transport on the results of thermal decomposition studies. Part 2. Polystyrene, polytetrafluoroethylene and polypropylene

Tamas Szekely, Gabor Varhegyi, Ferenc Till, Piroska Szabo, Emma Jakab

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

The thermal decomposition of pure polymer samples was studied at a low heating rate (4°C/min) and with sample masses of 0.3-6 mg in a Perkin-Elmer TGS-2 thermobalance. The various transport effects were distinguished by changing the gas flow from argon to helium, varying the sample mass and geometry and by applying a self-generated atmosphere. Sample masses of 3-6 mg showed marked effects of insufficient heat transfer in a flow of argon. The concentration of the volatile products above the samples did not influence the thermal decomposition. The diffusion problems in the polymer bulk, however, changed the kinetics from first order to zero order in the case of polytetrafluoroethylene, and increased the overall reaction rate of polypropylene. The latter effect was attributed to chain termination caused by the evaporation of small radicals from the thin polypropylene samples.

Original languageEnglish
Pages (from-to)83-92
Number of pages10
JournalJournal of Analytical and Applied Pyrolysis
Volume11
Issue numberC
DOIs
Publication statusPublished - Oct 1987

Keywords

  • Polymers
  • polypropylene
  • polystyrene
  • polytetrafluoroethylene
  • pyrolysis
  • thermal decomposition.

ASJC Scopus subject areas

  • Analytical Chemistry
  • Fuel Technology

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