Comparative Analysis of Cure Behaviors, Mechanical Properties, and Swelling Resistance in EPDM/SBR Composites with HNTs, APTES-Modified HNTs, and RH-Modified HNTs

Rubber blending is a prominent technique for enhancing properties in final rubber products. This study investigates the interplay of filler concentration and surface modification in EPDM/SBR blend composites with halloysite nanotubes (HNTs). The effects of γ-Aminopropyltriethoxysilane (APTES) and resorcinol-hexamethylenetetramine (RH) modifiers were examined. Comparing rubber blend composites with modified and unmodified HNTs, the findings reveal significant enhancements using RH-modified HNTs. These composites outperform those with APTES-modified and unmodified HNTs, notably improving mechanical properties. The addition of fillers increases crosslink density and filler-rubber interaction, reducing mole percent uptake. These trends result in significantly improved abrasion resistance in the composites. FESEM images show that RH-modified HNTs have superior distribution compared to APTES-modified and unmodified HNTs, highlighting their effective interaction and dispersion. These findings can guide the optimization and production of outdoor applications.