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Electron-Beam Radiation Crosslinking as a Route for Upgrading Recycled Polyethylene for Circular Economy Applications
Lyazat Tolymbekova1, Gaini Seitenova1, Aiymzhan Kazbekova1
1Department of Chemistry, Institute of Natural Sciences, L.N. Gumilyov Eurasian National University, Astana 010000, Kazakhstan.
Polymers
|July 28, 2026
Summary
Electron-beam irradiation effectively enhances recycled polyethylene by increasing crosslinking and improving mechanical properties. This method upgrades waste materials for broader applications in the circular economy.
Area of Science:
- Materials Science
- Polymer Chemistry
- Radiation Physics
Background:
- Growing demand for sustainable polymer solutions necessitates improved recycling methods.
- Recycled polyethylene often exhibits suboptimal performance for advanced applications.
- Electron-beam irradiation offers a potential pathway for polymer modification.
Purpose of the Study:
- To investigate electron-beam irradiation as a method for enhancing recycled polyethylene (rPE).
- To evaluate the impact of irradiation on structural, thermal, and mechanical properties of rPE.
- To determine optimal irradiation parameters for improved material performance.
Main Methods:
- Recycled polyethylene from façade-fastening elements and virgin PE-80 were electron-beam irradiated (5 MeV, 95-125 kGy).
- Characterization included FTIR, SEM/EDS, DSC, gel fraction analysis, and tensile testing (ISO 527).
- Comparison between irradiated and non-irradiated samples, including virgin polyethylene.
Main Results:
- Irradiation induced crosslinking in both virgin and recycled polyethylene, evidenced by increased gel fraction.
- FTIR confirmed the formation of oxygen-containing groups, indicating radiation-induced oxidation, especially in rPE.
- Mechanical testing showed increased tensile strength and elastic modulus, with reduced elongation at break in irradiated rPE.
- Optimal performance was observed at an irradiation dose of 110 kGy.
Conclusions:
- Electron-beam irradiation is a viable strategy for upgrading recycled polyethylene.
- The process enhances mechanical properties and crosslinking efficiency, despite rPE's inherent heterogeneity.
- Irradiated rPE shows potential for expanded use in circular economy initiatives.
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