Abstract
For the first time, sulfur K-edge X-ray absorption near-edge structure (S K-edge XANES) measurement was conducted at room temperature to evaluate a kind of the sulfidic linkage in solvent-extracted sulfur cross-linked isoprene rubbers. The vulcanizates were prepared by heat-pressing of the rubber compounds containing zinc oxide, stearic acid, N-cyclohexyl-2-benzothiazole sulfonamide and sulfur. The sulfidic linkage varied from a polysulfide type to a disulfide type with increasing of the torque during curing. A monosulfide type was also suggested to be generated from the disulfidic linkage. The S K-edge XANES measurement will be of use for evaluating a characteristic of the sulfidic linkages in the sulfur cross-linked rubber by combining the solvent extraction technique.
