A heterogeneous model for the thermal oxidation of solid polypropylene from chemiluminescence analysis

Celina M. and George G.A. (1993) A heterogeneous model for the thermal oxidation of solid polypropylene from chemiluminescence analysis. Polymer Degradation and Stability, 40 3: 323-335. doi:10.1016/0141-3910(93)90138-9


Author Celina M.
George G.A.
Title A heterogeneous model for the thermal oxidation of solid polypropylene from chemiluminescence analysis
Journal name Polymer Degradation and Stability   Check publisher's open access policy
ISSN 0141-3910
Publication date 1993-01-01
Sub-type Article (original research)
DOI 10.1016/0141-3910(93)90138-9
Open Access Status
Volume 40
Issue 3
Start page 323
End page 335
Total pages 13
Subject 1605 Policy and Administration
2507 Polymers and Plastics
Abstract From an analysis of chemiluminescence (CL) curves from the isothermal oxidation of polypropylene powder and film, it is proposed that the usual homogeneous kinetic analysis of the sigmoidal increase in apparent oxidation rate with time is inappropriate and should be considered instead as a statistical accumulation of rapidly oxidizing centres. Over the temperature range 90-150°C it is found that the CL curves up to the maximum emission intensity may be reduced to a single sigmoidal master curve by plotting the data after the induction period in relative coordinates. Identical activation energies are observed for the initial emission and the maximum emission intensities, which suggests that throughout the oxidation there is no change in the CL mechanism, which requires the occurrence of a degenerately branched chain reaction within the oxidizing centres. The induction period shows a different temperature dependence and in the heterogeneous model is interpreted as the time required for the oxidation to spread from the initially localized centres. This model is able to explain the observations of volatile formation in the earliest stages of oxidation and the rapid crack formation at the end of the induction period as well as other anomalies which cannot be rationalized in a homogeneous kinetic model.
Q-Index Code C1
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 13 Sep 2016, 12:03:32 EST by System User