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Polymer thermogravimetric analysis: effects of chain-end and reversible random scission

Authors
Journal
Chemical Engineering Science
0009-2509
Publisher
Elsevier
Publication Date
Volume
56
Issue
4
Identifiers
DOI: 10.1016/s0009-2509(00)00379-1
Keywords
  • Polymers
  • Multiphase Reactions
  • Kinetics
  • Vaporization
  • Population Balances
  • Pyrolysis
  • Thermogravimetric Analysis
Disciplines
  • Earth Science

Abstract

Abstract A new approach to polymer pyrolysis kinetics is based on moments of a population balance equation describing chain-end and random scission and repolymerization. Two equations for the zero and first moments (moles and mass) are solved for isothermal and nonisothermal (linear T increase) thermogravimetric analysis. The isothermal case is shown to have a simple relationship to an empirical acceleratory model, thus revealing its limitations and approximations. With realistic values of prefactors and activation energies, the new theory compares well with experimental data for polyether–ether–ketone pyrolysis.

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