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<p>To address the challenges of efficient, clean processing and resource recovery of waste plastics, this study selected two representative waste polymers-polystyrene (PS) and polyvinyl chloride (PVC)-as research subjects. Firstly, thermogravimetric analysis was employed to systematically investigate the pyrolysis behaviour of both single components (PS, PVC) and their mixed component (PS/PVC). Subsequently, comparative experiments and theoretical thermogravimetric curves confirmed the presence of synergistic effects during co-pyrolysis, with an in-depth analysis of their combined impact on pyrolysis behaviour (pyrolysis characteristics, kinetic parameters, thermodynamic parameters) and product distribution. Findings revealed the termination pyrolysis temperature of PS/PVC co-pyrolysis advanced significantly by 8.7℃,the PS/PVC co-pyrolysis process exhibited an overall positive synergistic effect. Kinetic analysis indicated: PS pyrolysis followed the A<sub>3/2</sub> model; PVC pyrolysis comprised two stages, adhering to the A<sub>1</sub> and F<sub>3</sub> models; PS/PVC co-pyrolysis followed the A<sub>3/4</sub> and F<sub>3</sub> models, with the activation energy sequence for pyrolysis being PVC &gt; PS/PVC &gt; PS. Thermodynamic analysis indicates the complexity of these reactions increases in the order PVC &gt; PS/PVC &gt; PS. Furthermore, synergistic effects significantly altered the distribution of pyrolysis products. Specifically, the actual gas yield of PS/PVC (40.3%) increased by 8.0% relative to the theoretical value (37.3%), while the actual oil yield (50.0%) decreased by 7.9% compared to the theoretical value (54.3%).</p>

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The influence of synergistic effects on the co-pyrolysis behaviour and product distribution of mixed waste plastics

  • 期刊论文

  • 发表日期：

    2026年5月7日

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  • Cangang Zhang

摘要

To address the challenges of efficient, clean processing and resource recovery of waste plastics, this study selected two representative waste polymers-polystyrene (PS) and polyvinyl chloride (PVC)-as research subjects. Firstly, thermogravimetric analysis was employed to systematically investigate the pyrolysis behaviour of both single components (PS, PVC) and their mixed component (PS/PVC). Subsequently, comparative experiments and theoretical thermogravimetric curves confirmed the presence of synergistic effects during co-pyrolysis, with an in-depth analysis of their combined impact on pyrolysis behaviour (pyrolysis characteristics, kinetic parameters, thermodynamic parameters) and product distribution. Findings revealed the termination pyrolysis temperature of PS/PVC co-pyrolysis advanced significantly by 8.7℃,the PS/PVC co-pyrolysis process exhibited an overall positive synergistic effect. Kinetic analysis indicated: PS pyrolysis followed the A3/2 model; PVC pyrolysis comprised two stages, adhering to the A1 and F3 models; PS/PVC co-pyrolysis followed the A3/4 and F3 models, with the activation energy sequence for pyrolysis being PVC > PS/PVC > PS. Thermodynamic analysis indicates the complexity of these reactions increases in the order PVC > PS/PVC > PS. Furthermore, synergistic effects significantly altered the distribution of pyrolysis products. Specifically, the actual gas yield of PS/PVC (40.3%) increased by 8.0% relative to the theoretical value (37.3%), while the actual oil yield (50.0%) decreased by 7.9% compared to the theoretical value (54.3%).