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Accelerated Continuous Flow Depolymerization of Poly(Methyl Methacrylate).

Katharina S C Jäger1,2, Gayathri Dev Ammini1,3, Pieter-Jan Voorter1,4

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Summary
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Continuous flow depolymerization of poly(methyl methacrylate) (pMMA) using inline dialysis significantly improves monomer recovery. This method enhances polymer concentration and reaction efficiency for industrial applications.

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Area of Science:

  • Polymer Chemistry
  • Chemical Engineering
  • Materials Science

Background:

  • Poly(methyl methacrylate) (pMMA) depolymerization is crucial for recycling.
  • Conventional batch processes face limitations in polymer concentration and efficiency.
  • Reversible addition-fragmentation chain transfer (RAFT) polymerization is a controlled method for synthesizing pMMA.

Purpose of the Study:

  • To develop an efficient continuous flow method for pMMA depolymerization.
  • To improve monomer recovery and reaction conversion rates.
  • To assess the feasibility of industrial-scale methacrylate depolymerization.

Main Methods:

  • Utilized a continuous flow reactor with an inline dialysis unit for immediate monomer removal.
  • Investigated depolymerization of pMMA synthesized via RAFT polymerization.
  • Examined effects of temperature, polymer concentration, and reactor modifications.

Main Results:

  • Achieved up to 68% monomer recovery at 1 M concentration without catalysts at 160 °C.
  • Demonstrated a 20-fold increase in polymer concentration compared to batch studies.
  • Inline dialysis effectively shifted the depolymerization equilibrium, enhancing conversion.

Conclusions:

  • The continuous flow approach with inline dialysis significantly advances industrial pMMA recycling.
  • Reduced solvent use, expanded operational temperature range, and increased polymer concentration are key benefits.
  • This method offers a practical pathway for sustainable methacrylate polymer processing.