Abstract

In this work, the nonlinearity responses of SBR 1500 compounds having black (N550) and clay (closite 10A) nano particles were studied. As expected, complex viscosity (η*) of filled SBR 1500 was higher than unfilled SBR; higher loading, larger η*. The strain dependency in complex viscosity was indicated as the critical strain, which was affected by nano particles type and content. In the presence of both black and nano clay, the nonlinearity zone of strain shifted to the lower strain especially at higher filler content. While black is more effective than nano clay on the nonlinearity phenomenon due to high loading and large black networks, which are highly sensitive to the applied strain. In addition, the elasticity response was investigated considering damping factor (tan δ). In the presence of nano clay, lower tan δ was observed comparing with unfilled SBR, hence more elasticity. As the clay content increased, more elasticity was achieved because of more interactions between clay particles and rubber chains. However, black had two different effects on tan δ: at low strains, black caused more elasticity while the reverse trend was recognized at high strains.

Keywords: SBR compound; Nano filler; RPA; Viscoelastic property; Elasticity