27th Annual Green Chemistry & Engineering Conference

Mixed Polyolefin Recycling

One of the most challenging aspects of polyolefin recycling is the post-consumer mixed waste stream. In addition to variabilities in recyclate composition, the similar densities and chemistries of polyethylene (PE) and polypropylene (PP) make the recyclates challenging to separate, however, the immiscibility of PE and PP lead to poor mechanical properties of their blends. This session will highlight the latest developments in the field of mixed polyolefin recycling, with an emphasis on fundamental research still needed to accelerate progress in mechanical and chemical recycling, recyclate characterization and sortation, and qualifications for use in future products.

Topics of interest include but are not limited to issues and gaps concerning:

  • Polyolefin design to improve end-of-use outcomes (may include greener advances in additives and formulation)
  • Recycled polyolefin compatibilization
  • Dissolution recycling
  • Improving mixed polyolefin mechanical properties
  • Catalytic upcycling of polyolefins
  • Polyolefin blend composition analysis
  • Spectroscopic and advanced sortation techniques
  • Economic and environmental impact assessments
  • Industrial-scale polyolefin recycling


Dr. McKenzie Coughlin, NIST
Dr. Kate Beers, NIST

Nominal Sponsor

National Institute of Standards and Technology (NIST)

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