Journal
EXPRESS POLYMER LETTERS
Volume 12, Issue 1, Pages 82-99Publisher
BUDAPEST UNIV TECHNOL & ECON
DOI: 10.3144/expresspolymlett.2018.7
Keywords
thermal properties; packaging plastic waste; polymeric mixtures; chemical recycling; pyrolysis kinetics
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The thermal behavior and pyrolytic kinetic analysis of main waste polymers (polypropylene (PP), polyethylene film (PE), poly(ethylene terephthalate) (PET), polystyrene (PS)) and three synthetic mixtures representing commingled post-consumer plastics wastes (CPCPWs) output from material recovery facilities were studied. Thermogravimetry (TG) pyrolysis experiments revealed that the thermal degradation of single polymers and the synthetic mixture enriched in PP occurred in one single step. The other two mixtures underwent a two-consecutive, partially overlapping degradation steps, whose peaks related to the first-order derivative of TG were deconvoluted into two distinct processes. Further TG experiments carried out on binary mixtures (PS/PP, PET/PP, PET/PEfilm and PP/PEfilm) showed a thermal degradation reliance on composition, structure and temperatures of single polymer components. A kinetic analysis was made for each step using the Kissinger-Akahira-Sunose (KAS) method, thus determining almost constant activation energy (E-a) for pyrolysis of PS, PET, PP and PE film in the range 0.25
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