Mechanical properties and thermal aging behaviour of polyisoprene/polybutadiene/styrene-butadiene rubber ternary blend reinforced with carbon black

The goal of this work was to study thermal aging of sulfur cured ternary blends based on polyisoprene (NR), polybutadiene (BR) and styrene butadiene rubber (SBR) (NR/BR/SBR = (25/25/50) reinforced with different loading carbon black (CB) nanoparticles (0-100 phr). The specimens were subjected to thermo-oxidative aging at 100 °C, for two times: at 72 h and 168 h, respectively, and then mechanically stretched to fracture by tension with a Zwick 1425 universal tensile testing machine. Rheological and mechanical properties were used as characterization of the ternary rubber blends. The reinforcing performance of the filler was investigated using rheometric, mechanical and swelling measurements, thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and Fourier Transform Infrared Spectroscopy with Attenuated Total Reflectance (FTIR-ATR). Tensile and swelling properties were determined before and after thermal aging. The rheological properties optimum cure time (tc90), scorch time (ts2) and the cure rate index (CRI) are decrease in NR/BR/SBR/CB = (25/25/50) ternary rubber blend with 60 phr of filler loading. The movement absorption band from 1451 cm−1-1455 cm−1 the interaction between rubber blend and CB filler is confirmed.