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  11. Degradation Rates And Ageing Effects Of Uv On Tyre And Road Wear Particles.

Degradation rates and ageing effects of UV on tyre and road wear particles.

Marloes F van Os1, Merel G A Nooijens2, Alex van Renesse van Duivenbode1

  • 1TNO Environmental Modelling, Sensing and Analysis, Princetonlaan 6-8, 3584 CB, Utrecht, the Netherlands.

Chemosphere
|January 22, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Tyre and road wear particles (TRWPs) are the largest microplastic source. UV-ageing experiments reveal degradation mechanisms, including particle size reduction and chemical breakdown, crucial for understanding environmental fate.

Area of Science:

  • Environmental Science
  • Materials Science
  • Polymer Chemistry

Background:

  • Tyre and road wear particles (TRWPs) are a major source of environmental microplastics, with continuous societal use exacerbating the issue.
  • Understanding TRWP degradation is vital for assessing their environmental fate and impact over time.

Purpose of the Study:

  • To investigate the abiotic degradation mechanisms of TRWPs under UV-ageing conditions.
  • To quantify the degradation rates and changes in particle characteristics.

Main Methods:

  • Accelerated UV-ageing of cryomilled tyre tread particles and road simulator TRWPs.
  • Thermogravimetric analysis (TGA) for degradation rate determination.
  • Static light scattering (SLS), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and gas chromatography-mass spectrometry (GC-MS) for characterization.
Keywords:
AgeingEnvironmental fateMicroplasticsTyre wear

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Main Results:

  • An average abiotic degradation rate of 0.025 day-1 was determined for TRWPs.
  • UV-ageing caused particle size reduction (0.03 μm day-1) and formation of smaller particles (<10 μm).
  • Reduced sulfur content and decreased chemical additives indicate crosslinking breakage and UV-induced oxidation as degradation pathways.

Conclusions:

  • UV-ageing effectively degrades TRWPs, reducing their size and altering chemical composition.
  • Crosslinking breakage and breakdown of additives are key degradation mechanisms.
  • Field measurements corroborate the experimental findings on TRWP degradation and accumulation.
degradation