EFFECT OF CARBON-BLACK ON THE THERMAL-PROPERTIES AND FLAMMABILITY OF CIS-1,4-POLYISOPRENE VULCANIZATES

The effect of carbon black with various particle sizes and specific surfaces on the thermal properties of the sulphur vulcanizates of cis-1,4-polyisoprene was studied by means of thermal analysis. It was found that the addition of carbon black does not change the nature of the thermal processes in isoprene rubber vulcanizates essentially, but it distincly affects the positions of the peaks recorded in the DTA curves. The specific surface of carbon black affects the temperature of the first exothermic process and the temperature and rate of destruction of cross-linked polyisoprene. The presence of carbon black brings about a reduction in the flammability of cis-1,4-polyisoprene vulcanizates. The specific surface of carbon black influences the value of the oxygen index OI.