This work investigates the use of recycled thermoplastic vulcanizate (TPV) in the preparation of elastomeric blends based on natural rubber (NR). Blends with varying contents of recycled PP/EPDM (0; 27.6; 55 phr) were investigated, and their physico-mechanical properties were evaluated before and after thermo-oxidative ageing. Parameters such as tensile strength, elongation at break, hardness, crosslink density, and thermal stability (via TGA) were analyzed. Scanning electron microscopy (SEM) revealed structural differences in the blends depending on the recyclate content. The blend containing 27.6 phr of r-PP/EPDM demonstrated the best balance between mechanical strength and processability. After thermo-oxidative ageing, a decrease in elongation was observed, indicating reduced material flexibility. When compared to commercial TPVs, some of the prepared blends exhibited comparable properties, making them a viable alternative in terms of recyclability and cost-effectiveness. The results confirm that the reuse of TPV waste in NR-based elastomeric blends is technically feasible and beneficial from both environmental and economic perspectives.

Acknowledgement: This research work has been supported by the Operational Program Integrated Infrastructure, co-financed by the European Regional Development Fund by the project: Advancement and support of R&D for "Centre for diagnostics and quality testing of materials" in the domains of the RIS3 SK specialization, Acronym: CEDITEK II., ITMS2014+ code 313011W442 and Scientific Grant Agency VEGA 1/0265/24.