Characterization of oxidation progress by chemiluminescence: A study of polyethylene with pro-oxidant additives |
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| Authors: | Marek Koutný ,Tereza Vá clavková ,Jozef Rychlý |
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| Affiliation: | a Department of Environmental Protection Engineering, Faculty of Technology, Tomas Bata University in Zlin, 762 72 Zlin, Czech Republic
b Polymer Institute, Slovak Academy of Sciences, 842 36 Bratislava, Slovak Republic |
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| Abstract: | Non-isothermal chemiluminescence measurements in nitrogen and isothermal measurements in oxygen were used for the evaluation of degradation in pre-oxidized polyethylene either pure or containing Mn-based pro-oxidant additives. The results were compared with infrared spectroscopy data. Chemiluminescence measurements of pure polyethylene and polyethylene with additive made it possible to calculate the set of rate constants, based on the Bolland-Gee oxidation scheme. The oxidation rate constants of polyethylene with additive were significantly higher, while the activation energy of the process appeared lower (65 kJ mol−1), than those of pure polyethylene. The method provides an access to study oxidation processes during the induction period of oxidation when infrared spectroscopy cannot provide sufficient information. |
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| Keywords: | Non-isothermal and isothermal chemiluminescence Rate of oxidation Carbonyl index Hydroperoxides concentration Polyethylene Pro-oxidants |
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