Changes in properties of vulcanized SBR during aging at 130° C in air are the result of reactions involving both the hydrocarbon and the crosslinks. Hydrocarbon oxidation is related to the overall rate of oxidation; it leads to both scission and crosslinking. Sulfur crosslinks are broken and new crosslinks formed in reactions which are affected by oxygen but relatively independent of the overall rate of oxidation. The excess of crosslinking over scission decreases progressively with increasing cure.

This content is only available as a PDF.
You do not currently have access to this content.