Synthesis of a New Nanosilica-Based Antioxidant and Its Influence on the Anti-Oxidation Performance of Natural Rubber

Abstract

Nanosilica was modified with a silane coupling agent 3-Glycidoxypro- pyltrimethoxysilane (KH-560) and then reacted with p-aminodiphenylamine (RT) to obtain a new nanosilica-based antioxidant. Fourier transform infrared and thermogravimetric (TGA) analysis measurements confirmed the successful grafting of RT to the nanosilica surface. Scanning electron microscope analysis showed that the nanosilica-based antioxidant could be homogeneously dispersed in a natural rubber matrix. Differential scanning calorimetry and TGA were used to measure the thermal oxidative behavior of rubber vulcanizates with different types of fillers. It was found that the thermal oxidative stability of rubber vulcanizates with the nanosilica-based antioxidant was improved to a greater extent than that with other fillers examined.