DISPERSION OF PARTICLES IN POLYMER COMPOSITES FILLED WITH CARBON BLACK STUDIED BY SCANNING ELECTRON MICROSCOPY OBSERVATION

抄録

The degree of dispersion of carbon black (CB) particles in a polymer matrix is known to be a determining factor in the physical properties of the composites. In this study, we discuss the effect of the oxidation treatment of CB, the chemical modification of the chain-ends and main chain of the polymers and molding time on this dispersion in detail, through a study using scanning electron microscopy (SEM) observation. The oxidation of CB changed the state of its distribution in some polymer matrices: in a nonpolar polymer the fillers was aggregated, but, in a polar polymer the dispersion of the fillers was improved. The chemical modification of chain-ends causes a regular distribution of CB particles, but the chemical modification of the main chain caused the CB particles to be aggregated. Also, this distribution state was changed in accordance with the molding time.