Effect of Gamma Radiation on the Properties of Recycled High-Density Polyethylene Composites Reinforced with Pine and Bolaina Wood

Chinchay-Bengoa A.N.; Coral M.F.C.; Catarí E.; Huanacune J.Y.; Vara-Garcia J.M.; Herrera A.; Longa E.; Campusano J.J.G. · Fibers and Polymers (2026) · DOI: 10.1007/s12221-026-01387-8

Resumen

This study involved the development of wood–plastic composites (WPCs) using recycled high-density polyethylene (rHDPE) particles from Pinus radiata or Guazuma crinita in 80/20 and 70/30 proportions with 2.5% of a coupling agent (MAPE) added to all formulations. The samples were irradiated with doses of 0, 50, and 75 kGy, and their physical properties (moisture, absorption, and density), as well as their thermal, chemical, and tensile properties, were evaluated. The findings demonstrated that gamma irradiation effectively reduces moisture content and water absorption, suggesting an improvement in matrix-reinforcement cohesion. Similarly, density increased significantly at 50 kGy, but decreased slightly at 75 kGy, likely due to the onset of degradation effects. Regarding mechanical properties, some formulations exhibited slight increases in fracture and ultimate tensile stress, particularly at 50 kGy, without compromising material integrity. FTIR and TGA analyses confirmed the presence of simultaneous cross-linking and chain scission processes, depending on the applied dose. Overall, these findings demonstrate that gamma irradiation is an effective strategy to enhance the physical and interfacial stability of WPCs manufactured from recycled materials, thereby contributing to the technological valorization of plastic and lignocellulosic recycling within the Peruvian context. © The Author(s), under exclusive licence to the Korean Fiber Society 2026.

Instituciones: Universidad Nacional Agraria La Molina; Universidad San Ignacio de Loyola