Oxidation of Unvulcanized Cold Rubber. Influence Ofadsorption by Carbon Black

Carbon Black in the Oxidation of Butadiene-Styrene Vulcanizates

“…In some instances carbon black appeared to act as an antioxidant for rubber oxidation (6,11,19) and not as a promotor of oxidation as reported (22). This investigation involved new but similar oxidation studies.…”

“…These functional groups probably play a vital role in the mechanism of carbon black activity. For example, Sweitzer (19) has shown that the inhibitory power of carbon black is a function of the oxy-functional group content of the black, the decomposition of peroxides by black being reduced or halted by deoxidizing the black.…”

“…Hence, the effect of carbon black on oxidation was termed to be a catalytic one. Much information on the effect of carbon black upon the oxidation of rubber has been reported by other laboratories. Sweitzer and coworkers have observed an inhibitory effect (6,11,19). Kuz'minskii and his group found an acceleration, but explained it on a different basis (10).…”

Cure of Carbon Black–Unsaturated Polyester Mixtures

“…Assuming that this decomposition is homolytic, the free radicals formed would in turn be inactivated on the carbon surface. Carbon blacks which Sweitzer and Lyon (7) found to be strong antioxidants for unvulcanized rubber are also the most powerful inhibitors for benzoyl peroxide polyester cures.…”

“…of the heat capacity of ra-heptane, which has been selected by the Fourth Conference on Calorimetry (4) as one of the reference substances for calorimetric work. The heat capacity of n-heptane was studied by Parks (13), and critically chosen values were reported by Ginnings (7). Beattie and coworkers (23) determined the critical constants and Smith (22) the vapor pressure of this compound.…”