Abstract
The non-isothermal thermogravimetric methods have been used extensively for the determination of kinetic parameters in polymers. The poly (ether ketones) are used as matrix in advanced high performance composites due its high thermal stability, excellent environmental performance and superior mechanical properties. In this work, the non-isothermal decomposition kinetics of the polymer poly (ether ether ketone) (PEEK) was evaluated in nitrogen and synthetic air atmospheres, using the Flynn-Wall-Ozawa and Coats Redfern models. The results showed that the necessary time for the material decomposes in 5% is approximately 216 years if it is submitted to temperatures of 350 °C in nitrogen atmosphere. On the other hand, if the material is submitted to air atmosphere, this decomposition time drops to about 1,05 years in the same temperature and for the same conversion rate. The decomposition kinetics study by Coats Redfern showed that the D3 mechanism (three-dimensional diffusion (Jander equation)) had better adjustment to the decomposition kinetics of the material in nitrogen atmosphere, while in synthetic air the R1 mechanism (phase boundary controlled reaction (one-dimensional movement)) has better adjustment to the decomposition kinetics of the material.
Highlights
The poly are used as matrix in advanced high performance composites due its high thermal stability, excellent environmental performance and superior mechanical properties
The present paper describes a kinetic study of the thermal degradation of poly under dynamic conditions using an isoconversional and discrimination method
The decomposition kinetic study showed that the material has high thermal stability
Summary
The poly (ether ketones) are used as matrix in advanced high performance composites due its high thermal stability, excellent environmental performance and superior mechanical properties. The thermogravimetric analysis has been widely used as a method for investigate the thermal decomposition of polymers and for determine their thermal stability. The kinetic analysis of a decomposing material can be done using two different techniques: the dynamic and the isothermal thermogravimetric studies. The dynamic thermogravimetric data can be analyzed using two different methods, the isoconversional and the discrimination. The isoconversional methods use the data from a series of thermogravimetric (TGA) curves obtained at different heating rates to calculate the activation energy (Ea) but do not provide any information about the kinetic function (g(x)) of the process. The present paper describes a kinetic study of the thermal degradation of poly (ether ether ketone) under dynamic conditions using an isoconversional and discrimination method. In this work the non-isothermal curves generate by thermogravimetry (TGA) are used to study the degradation kinetics of PEEK using the Flynn-Wall-Ozawa and Coats Redfern models
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