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Vector Product (Cross Product)01:17

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Depolymerization of waste poly(methyl methacrylate) scraps and purification of depolymerized products.

Chirag B Godiya1, Serena Gabrielli1, Stefano Materazzi2

  • 1Chemistry Division, School of Science and Technology, University of Camerino, Via. S. Agostino 1, 62032, Camerino, MC, Italy.

Journal of Environmental Management
|January 4, 2019
PubMed
Summary

This study details the thermal depolymerization of poly(methyl methacrylate) (PMMA) to recover methyl methacrylate (MMA) monomer. Byproducts were identified and removed, enabling the creation of high-quality recycled PMMA (r-PMMA) with properties similar to virgin material.

Keywords:
2,3-butanedioneDissolution/re-precipitationMMA recyclingPMMA depolymerizationPyrolysis

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Chemical Engineering

Background:

  • Plastic waste management is a significant global challenge.
  • Efficient recycling methods are crucial for sustainability.
  • Poly(methyl methacrylate) (PMMA) waste requires effective regeneration strategies.

Purpose of the Study:

  • To investigate the thermal depolymerization of PMMA for monomer recovery.
  • To identify and characterize byproducts formed during depolymerization.
  • To develop a purification method for recycled PMMA (r-PMMA) with properties comparable to virgin PMMA.

Main Methods:

  • Thermogravimetric analysis coupled with mass spectrometry (TGA-MS) for decomposition analysis.
  • Identification of byproducts including methyl isobutyrate, methyl pyruvate, and 2,3-butanedione.
  • Purification of r-PMMA via dissolution and re-precipitation.
  • Structural and chemical characterization using FT-IR, NMR, DSC, and GPC.

Main Results:

  • High yield of methyl methacrylate (MMA) monomer achieved through thermal depolymerization.
  • Identified non-polymerizable byproducts that negatively impact polymerization and r-PMMA quality.
  • 2,3-butanedione identified as the source of unpleasant odor in recovered MMA and r-PMMA.
  • Purification effectively removed byproducts, yielding r-PMMA with properties similar to virgin PMMA.

Conclusions:

  • Thermal depolymerization is a viable method for PMMA recycling.
  • Byproduct identification and removal are critical for producing high-quality r-PMMA.
  • This study offers a practical prototype for PMMA waste recycling, reducing landfill pollution.