Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 132, Issue -, Pages 47-55Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jaap.2018.03.017
Keywords
Polymer recycling; Pyrolysis; Poly(methyl methacrylate); Monomer recovery
Funding
- CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior)
- Dentsply
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The chemical recycling of crosslinked poly(methyl methacrylate) wastes, PMMA, used as dental resins, was investigated for recovery and polymerization of the methyl methacrylate monomer, MMA. At temperatures of 400 degrees C in laboratory and pilot plant installations, PMMA could be depolymerized by pyrolysis to produce more than 90 wt% of liquid, containing more than 98 wt% of MMA. Gas chromatography (GC) and coupled gas chromatography - mass spectrometry (GC-MS) analyses were carried out to characterize the obtained liquid fraction. PMMA powders produced with different quantities of recycled MMA were prepared, after purification of the liquid through distillation, leading to polymer resins with properties that were similar to the ones obtained with virgin commercial MMA, as characterized by particle size, Fourier transform infrared (FT-IR), gel permeation chromatograph (GPC) and scanning electron microscopy (SEM) analyses.
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