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Processing and Mechanical Properties of Highly Filled PP/GTR Compounds.

Artur Kościuszko1, Dariusz Sykutera1, Piotr Czyżewski1

  • 1Department of Manufacturing Techniques, Bydgoszcz University of Science and Technology, 85-796 Bydgoszcz, Poland.

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Recycling ground tire rubber (GTR) into polypropylene (PP) is now feasible using injection molding with a novel modifier. This process enhances material properties and reduces production cycle times for rubber-filled polypropylene.

Keywords:
compoundsground tire rubberinjection moldingpolypropylenerubber recycling

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Recycling Technology

Background:

  • Ground tire rubber (GTR) is challenging to recycle due to its cross-linked structure, limiting its thermoplastic applications.
  • Developing effective recycling methods for GTR is crucial for sustainability and resource management.

Purpose of the Study:

  • To investigate the injection moldability of highly filled polypropylene/ground tire rubber (PP/GTR) compounds.
  • To evaluate the impact of a specific peroxide modifier, 2.5-dimethyl-2.5-di-(tert-butylperoxy)-hexane, on PP/GTR processing and properties.
  • To determine the optimal GTR content for effective processing and property enhancement.

Main Methods:

  • Injection molding of PP/GTR compounds with varying GTR content (30-90 wt.%) and a peroxide modifier.
  • Melt flow index (MFI) testing to assess rheological properties.
  • In-mold temperature and pressure monitoring during injection molding.
  • Mechanical testing including hardness, impact, and static tensile tests.
  • Differential scanning calorimetry (DSC) for thermal property analysis.

Main Results:

  • Efficient injection molding of PP/GTR compounds with up to 90 wt.% GTR was achieved.
  • The peroxide modifier improved the rheological properties of the PP matrix, enhancing GTR-matrix bonding.
  • Reduced cooling times in the injection mold were observed, leading to shorter production cycle times.
  • Mechanical properties, such as hardness and tensile strength, were improved due to better filler-matrix adhesion.

Conclusions:

  • Injection molding is a viable method for processing highly filled PP/GTR compounds.
  • The addition of 2.5-dimethyl-2.5-di-(tert-butylperoxy)-hexane significantly enhances the processability and mechanical performance of PP/GTR composites.
  • This research offers a promising pathway for the effective recycling and utilization of ground tire rubber in polymer applications.