Abstract
The properties of the dry ground clays and the SBR compounded with them were examined.It was shown that the changes in particle surface properties as well as the changes in specific surface area by grinding were related to the physical properties of rubber.
The immersion heat had a good correlation with the rubber properties. Mooney viscosity was related to the immersion heat in water, and scorch time was related to the immersion heat in ethyl benzene.Tensile strength increased with the specific surface area of filler;there was a maximum at which the tensile strength began to decrease abruptly as the specific surface area increased.In the rubber compounded with high ground clay, the filler particles were not well dispersed and could be found as agglomerate.It seems that a decrease of tensile strength of the rubber compounded with the high ground clay causes the difficulty of dispersion of filler.
