THE EFFECT OF CARBON BLACK COMPOSITION IN NATURAL RUBBER COMPOUND

This study aims to determine the effect of carbon black (CB) filler composition on natural rubber compounds on thermal properties, morphology, diffraction patterns, and functional groups. The method of making compound uses an open mill by mixing SIR 20 natural rubber as a binder and carbon black as a filler with a composition variation (0; 2; 4; 6 and 8)wt%. The diffraction pattern shows that there is a change from the shape of the amorphous structure to the semi-crystalline form with increasing CB composition. Morphological results showed that the mixture was homogeneous. FTIR graph shows that there is no significant difference between compound with filler and without filler. Differential scanning calorimetric analysis, the addition of carbon black composition to natural rubber increases the heat delta of the compound compared without CB.