Intrinsic sulphur content of carbon black and its relevance to rubber vulcanisate analysis
1989
Davey, J. E.
This paper describes work carried out to improve the accuracy of any reconstruction of formulation of a black-reinforced rubber article by taking into account the sulphur level associated with the carbon black used in its manufacture. The sulphur content of carbon black can vary from the parts per million level to over the percent level according to the method of manufacture and the feedstock used, and this can influence any calculation carried out to reconstruct the original formulation. The carbon black is recovered from natural rubber vulcanisates by pyrolysis under nitrogen and after removal of acid-soluble inorganic fillers, the residual sulphur content is determined by a standard furnace combustion followed by titrimetric estimation of the sulphur as sulphate. It has been shown for a series of carbon blacks of various sulphur contents recovered from both conventional cure and EV systems based on NR vulcanisates that this residual sulphur content equates to the intrinsic sulphur content of the virgin black.
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