A Study on a New Testing Method by Dynamic Viscoelastic Properties for the Rubber Processing Analysis

Abstract

It is considered that, in the mixing process of carbon black filled rubber systems, the degree of polymer-carbon black interactions and the degree of carbon black dispersion in polymer proceed at the same time. If these structural changes are evaluated respectively, it is considered possible to quantify the kneading state of the rubber compound more precisely. Attention is paid here to the dynamic viscoelastic properties with the rubber compound.It was found that an apparent activation energy (Ea) calculated from the temperature dependence of dynamic viscosity modulus is an effective index for measuring the degree of polymer-carbon black interaction. And carbon black dispersion was quantified by dynamic elasticity modulus change ratio (Gr) at dynamic elastic modulus (19.98%) versus that (0.98%), taking notice of Payne effect. These indices can be calculated simply and easily from dynamic viscoelastic property measurements. This testing method can be applied to estimate the kneading state of the rubber compound.