RELATIONSHIP BETWEEN VISCOELASTIC PROPERTIES AND CHARACTERISTICS OF FILLER-GEL IN FILLED RUBBER SYSTEM

The wide-line NIVIR and viscoelastic measurements were carried out for the filled rubber systems. NMR results revealed that the filler-gel in the filled rubber composites had a multi-component system depending on the mobility of rubber molecules. The fraction and lhe spin-spin relaxation time of each component were well correlated with the viscoelastic properties such as dynamic storage modulus (Eʹ) and loss-tangent (tan(delta)) of lhe filled rubber systems. Such findings turned out to be useful in designing new tread materials with well-balanced wet traction and rolling resistance in tires.