Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 91: Issue 1
Non-isothermal kinetics of degradation of ultra-high molecular mass polyethene composite materials
Part I. Composite materials with fiber monocrystals
Authors:
Dimitrina Koleva Prof. Assen Zlatarov University Department ‘Materials Science’ Y.Yakimov Str. 1 Burgas 8010 Bulgaria

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and
Atanas Atanassov Prof. Assen Zlatarov University Department ‘Materials Science’ Y.Yakimov Str. 1 Burgas 8010 Bulgaria

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Pages:
213–218
Online Publication Date:
11 Jul 2007
Publication Date:
01 Jan 2008
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-007-8324-0
Keywords:
composite materials; fiber monocrystals; kinetic parameters; ultra-high molecular mass polyethene
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Abstract  

In the present work, the Coats-Redfern method was used to determine the kinetic parameters and the possible reaction mechanism of the thermal degradation of ultra-high molecular mass polyethene and its composites with fiber monocrystals in static air at three different heating rates − 6, 10 and 16 K min−1. The analysis of the results obtained showed that the thermal degradation process of pure ultra-high molecular mass polyethene corresponded to a diffusion controlled reaction (three-dimentional diffusion, mechanism D3), while its composites with fiber monocrystals degraded by two concurrent mechanisms (diffusion one D3 and A1,F1 mechanism). The fiber monocrystals used increased the thermal stability of the composite materials obtained. The values of the activation energy, frequency factor, the changes of entropy, enthalpy and Gibbs energy for the active complex of the composites were calculated.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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