Synthesis of nanosilica‐based immobile antioxidant and its antioxidative efficiency in SBR composites

Nanosilica was successfully grafted with antioxidant intermediate p‐aminodiphenylamine (RT) via silane coupling agent 3‐glycidoxypropyltrimethoxysilane (KH‐560), and the structures of product RT‐silica were confirmed by Fourier transform infrared spectra (FTIR) and other methods. RT‐silica exhibited excellent performance in many aspects. Scanning electron microscopy (SEM) observation shows that the RT‐silica has a better dispersion state and compatibility with the SBR matrix. The tests of oxidation induction time (OIT) have revealed that RT‐silica possesses better antioxidative and antimigratory efficiency than that of the corresponding low molecular counterpart. Degradation activation energy (Eα) of SBR composites were evaluated by the Kissinger–Akahira–Sunose (KAS) method and the results showed that SBR composites with RT‐silica have better thermal stability properties. POLYM. COMPOS., 34:1856–1862, 2013.