Search

AbstractOur research described in this article examined the physical aging of natural rubber (NR) and nitrile rubber (NBR) compounds reinforced with nano-silica (n-SiO2) particles. The impact of NR and nano-silica content on the mechanical, spectral, and thermal properties of the composites was assessed using Shore hardness, thermal gravimetric analysis (TGA), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The results showed that after 8 days of aging in toluene or xylene at room temperature, high NR content caused significant swelling in the non-polar solvents, unlike NBR, which prevented rubber chain stretching and reduced the free volume. The transport mechanism of the toluene and xylene was pseudo-Fickian and slightly dependent on the nano-silica content. The hardness of the vulcanized blends increased with NBR and silica incorporation due to better dispersion of the particules and rubber-filler interaction, leading to high cross-linking density. XRD patterns confirmed the filler intercalation within the polymer matrix, causing a diffraction shift to a lower 2θ value of the various reflectures. Differential thermogravimetric analysis (DTGA) revealed that the n-SiO2 nanoparticles enhanced the thermal stability due to strong polymer chain interactions. These findings suggest that nano-silica-filled NR/NBR blends have significantly improved physical, mechanical, and thermal properties, supporting their potential for advanced elastomer-based materials in industrial applications. [ABSTRACT FROM AUTHOR]