The Oxidative Hardening of SBR

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Abstract
During aging, SBR hardens. This hardening can be followed by swelling volume, hardness, and modulus measurements. Crosslink properties are important in determining the amount of oxidative hardening. The quantity of Sx-type sulfur in the R−S−Sx−S−R polysulfide crosslinks correlates well with the extent of hardening. A drastic reduction in ultimate elongation accompanies hardening, and this is believed to be intimately related to the severe reduction in resistance to cut growth and flexing.

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