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Polypropylene Pipe Compounds with Varying Post-Consumer Packaging Recyclate Content.

Paul J Freudenthaler1, Joerg Fischer1, Yi Liu2

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Summary
This summary is machine-generated.

This study investigates using recycled polypropylene (PP) from packaging in new pipe compounds. Results show these recycled materials, even at 30% content, offer good fatigue crack resistance for less demanding pipe applications.

Keywords:
cracked round barfatigue crack growthpipe materialsplastics recyclingpolypropylenepost-consumerrecyclate

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Area of Science:

  • Materials Science
  • Polymer Engineering
  • Sustainable Materials

Background:

  • European Commission recycling targets increase polypropylene (PP) post-consumer recyclates (PCRs) availability.
  • No regulations mandate recycled PP (rPP) use, challenging industry to find applications.
  • Pipe applications, excluding pressurized systems, are a potential avenue for PCRs.

Purpose of the Study:

  • To explore the feasibility of using commercially available PCRs in compounds with virgin PP pipe grades.
  • To assess the suitability of these compounds for less-demanding pipe applications like non-pressure sewage systems.
  • To evaluate the mechanical and physical properties of PP compounds containing varying percentages of recyclates.

Main Methods:

  • Two commercial rPPs and one recycled polyolefin (rPO) were blended with two virgin PP pipe grades at 10%, 20%, and 30% recyclate content.
  • Compounds were tested for short- and long-term mechanical performance and other physical properties.
  • Fatigue crack growth (FCG) resistance was a key performance indicator, with factors like melt flow rate and cross-contamination investigated.

Main Results:

  • All tested compounds demonstrated good fatigue crack growth (FCG) resistance when compared to virgin polymer benchmarks.
  • The study identified melt flow rate and polyolefin cross-contamination as significant factors influencing FCG resistance.
  • Recyclate content up to 30% did not prevent the compounds from meeting performance requirements for specific pipe applications.

Conclusions:

  • Recycled polypropylene (PP) from packaging can be effectively utilized in compounds for less-demanding pipe applications.
  • The developed compounds show promising durability and mechanical performance, particularly in fatigue crack resistance.
  • Further investigation into factors like melt flow rate and cross-contamination is crucial for optimizing the use of recycled PP in pipe manufacturing.