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    Investigation of the effect of using devulcanized rubber in EPDM, NR, and EPDM/NR rubber compound recipes
    (Springer, 2025) Topcu, Merve; Comez, Ezgi Erbek; Ozturk, Selda; Hosgun, Halit L.
    Waste rubber is one of the most important solid waste residuals today. Since the traditional disposal approaches of burning or storing them, especially end-of-life tires, were banned due to the production of toxic fumes and gasses that cause serious health problems and various environmental concerns, recycling waste rubber has gained importance in terms of sustainability. There are many studies in the literature on the recycling of waste rubber. Devulcanization is one of the hot spots in waste rubber recycling today. This work aimed to investigate the effects of using devulcanized waste rubber on the rheological and mechanical properties of the blends of natural rubber (NR) and ethylene-propylene-diene monomer (EPDM) rubber blends. A total of 38 parts per hundred (phr) of devulcanized rubber was introduced into rubber blends consisting of 100% NR, 80% NR/20% EPDM, and 100% EPDM. The effects of devulcanized rubber on the rheological and mechanical properties were studied by analyzing the obtained final products. The findings showed that devulcanized waste rubber functioned as a filler within the rubber compounds and improved some mechanical properties. The use of devulcanized rubber offered both economic benefits and environmental sustainability by promoting the efficient use of the limited resources. Additionally, the results were evaluated according to the SAE J200 M3BA510A14 standard, ensuring that the rubber blends met industry standards for durability and performance, particularly in demanding applications.
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    The rheological, mechanical and aging properties of AEM/EPDM rubber blends
    (Springer Singapore Pte Ltd, 2021) Ozturk, Selda; Erbek Comez, Ezgi; Hoşgün, Halit Levent
    Rubbers are used in many applications in industries such as chemistry, automotive, agriculture, and aviation. However, different types of rubbers should be used to meet the end-user expectations in all these areas of use. In recent years, the use of the blending method has obtained both superior properties and low-cost rubbers with the synergistic effect of two different rubbers. Ethylene acrylic rubber (AEM) is resistant to heat, chemicals, and ozone, but it is not well resistant to low aniline oil and polar solvents. In addition, AEMs are much more expensive than most standard elastomers. In this study, the upside-down method was applied to preparing the series of AEM and Ethylene propylene diene monomer (EPDM) rubber blends in a Banbury-type internal mixer. Rubber blends were a mixture of AEM and EPDM rubber in 90/10, 20/80, 30/70, and 60/40 phr rubber ratio variation. In addition, each of the blends was tested to determine rheological and mechanical properties such as tensile strength, elongation at break, hardness and compression set as well as thermal and oil (IRM 901 and IRM 903) aging effects. The 10% addition of EPDM rubber causes an increment in the compression set, the tensile strength, and elongation at break. It was observed that the tensile strength values of A100 and A90E10 samples were larger than 8 MPa and the hardness value did not change after aging in IRM 901 oil. A100 and A90E10 samples show satisfying results to the requirements SAEJ200M3EE708 standard.