A Blocked Mercapto Silane Functionalized Silica Decorated‐Aramid Nanofiber to Evolve Elastomer/Silica Composite for Energy‐Efficient Tire

ABSTRACT In situ generated nanosilica particles were grafted onto aramid nanofibers while modified with a blocked mercapto silane (3‐Octanoylthio‐1‐propyltriethoxysilane). Nanofibers were derived from macro aramid fibers (poly ( p ‐phenylene terephthalamide)). Fourier‐transform infrared spectroscopy and x‐ray photoelectron spectroscopy revealed that the direct condensation reaction between the silane's ethoxy groups and the nanofiber's hydroxyl or carboxylic groups forms SiO‐C bonds. Morphological analysis of nanofibers revealed the formation of nanosilica from unreacted residual silane on the modified nanofiber (A‐NM) surface. In situ silica formation caused SiOSi bond formation, according to the spectroscopic analysis. Styrene butadiene rubber‐silica composites with modified nanofiber additive were prepared. The bound rubber content and filler flocculation rate displayed an improvement in nanofiber dispersion and rubber‐nanofiber interaction after silane modification. Mechanical characteristics of the composites improved after rubber and modified nanofiber interaction, dispersion, and strengthening. The nanofibers evenly distributed during mixing, as proven by morphological analysis of composites. Incorporation of 1 phr of A‐NM increased tensile strength by 16% and abrasion resistance by 3.1%. Composite's rolling resistance indicator (6.2%) and winter traction indicator increased at high temperatures with 1 phr of A‐NM loading. This specialized filler decorated nanofibers could be used as energy‐efficient tire additives as an alternative to other trendy commercial materials.