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 (E) 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. (c) 2013 Society of Plastics Engineers