Illucidation of the reaction mechanisms of silane coupling agent between silica and rubber
L.A.E.M. Reuvekamp; J.W. ten Brinke; P.J. van Swaaij J.W.M. Noordermeer
Adding a bi-functional coupling agent enhances filler-matrix compatibility. The most commonly used coupling agent is bis(3-triethoxysilylpropyl) tetrasulphide, known as TESPT, Si-69 or A1289. Its dual function encompasses a better dispersion of the filler during mixing and a chemical coupling between filler surface and polymer. The reactions that take place between the TESPT and the silica surface (primary reaction) and the rubber matrix (secondary) were studied.