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Modelling the chemical recycling of crosslinked poly (methyl methacrylate): kinetics of depolymerisation

Da Ros, S; Braido, RS; de Souza e Castro, NL; Brandão, ALT; Schwaab, M; Pinto, JC; (2019) Modelling the chemical recycling of crosslinked poly (methyl methacrylate): kinetics of depolymerisation. Journal of Analytical and Applied Pyrolysis , Article 104706. 10.1016/j.jaap.2019.104706. (In press).

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Abstract

Whereas increasing plastic solid waste production constitutes one of the main challenges of modern society, mainly due to the lack of suitable recycling technologies, chemical recycling represents an attractive solution for the conversion of plastic solid waste into valuable chemical intermediates. Herein, a kinetic model for the pyrolysis of a dental industry waste, ethylene glycol dimethacrylate (EGDMA) crosslinked poly (methyl methacrylate) (PMMA), is presented for the first time. Kinetics parameters and their statistical significance have been estimated from eight non-isothermal thermogravimetric analysis (TGA) experiments with heating rates varying between 5 and 50 °C·min-1 by using nonlinear regression. Our analysis indicates that the mechanism of depolymerisation of EGDMA crosslinked PMMA is likely to involve a consecutive reaction pathway involving two steps. The developed kinetic model - containing five kinetic parameters only - was able to predict well all non-isothermal TGA runs, and was validated against isothermal TGA experiments at 400 °C.

Type: Article
Title: Modelling the chemical recycling of crosslinked poly (methyl methacrylate): kinetics of depolymerisation
DOI: 10.1016/j.jaap.2019.104706
Publisher version: https://doi.org/10.1016/j.jaap.2019.104706
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: plastic solid waste, chemical recycling, poly (methyl methacrylate), thermogravimetric analysis
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Bartlett School Env, Energy and Resources
URI: https://discovery.ucl.ac.uk/id/eprint/10083214
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