Measurement of kinetics and thermodynamics of the thermal degradation for charring polymers

This work was focused on developing and applying a systematic methodology for the measurement of kinetics and thermodynamics of the thermal degradation of polymeric materials. This methodology employed a simultaneous thermal analysis instrument capable of thermogravimetric analysis (TGA) and differe...

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Bibliographic Details
Published in:Polymer degradation and stability 2014-08, Vol.106, p.2-15
Main Authors: Li, Jing, Stoliarov, Stanislav I.
Format: Article
Language:English
Subjects:
Applied sciences
Combustion
Decomposition
Differential scanning calorimetry
Engineering plastics
Exact sciences and technology
Fibers and threads
Forms of application and semi-finished materials
Heat of gasification
Mathematical models
Methodology
Physical properties
Polymer industry, paints, wood
Polymerization
Properties and testing
Pyrolysis modeling
Technology of polymers
Testing and control
Thermal decomposition
Thermal degradation
Thermic properties and inflammability
Thermodynamics
Thermogravimetric analysis
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Description
Summary:This work was focused on developing and applying a systematic methodology for the measurement of kinetics and thermodynamics of the thermal degradation of polymeric materials. This methodology employed a simultaneous thermal analysis instrument capable of thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). A numerical model was utilized to fit thermogravimetric data to obtain thermal degradation kinetics. This model was subsequently employed to analyze DSC heat flow and extract sensible, melting and decomposition reaction heats. The extracted set of kinetic and thermodynamic parameters was shown to simultaneously reproduce TGA and DSC curves. In the current study, this methodology was applied to polymers that produce a significant amount of carbon rich residue (char) upon thermal decomposition. The analyzed materials were a poly(methyl methacrylate)–poly(vinyl chloride) alloy (Kydex), polymerized diglycidylether of bisphenol A, poly(ethylene terephthalate), poly(paraphenylene terephthalamide) (Kevlar), polymerized bisphenol A cyanate ester, poly(phenylene sulfide), polyetherimide and poly(ether ether ketone). The materials that produced less than 40 wt.% of char upon decomposition were found to decompose endothermically. The materials whose char yield exceeded 40 wt.% were found to undergo an exothermic decomposition.
ISSN:0141-3910
1873-2321
DOI:10.1016/j.polymdegradstab.2013.09.022