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Effect of sulfenamide and disulfide compounds on covulcanization of NR–EPDM

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Synergistic combinations of diisopropyl thiophosphoryl‐N‐oxydiethylene sulfenamide (DIPTOS) with some disulfide accelerators or sulfur donors improve the physical properties of NR–EPDM blend vulcanizates. Various combinations of DIPTOS with dibenzothiazyl disulfide (MBTS), tetramethyl thiuram disulfide (TMTD), bis(N‐oxydiethylene) disulfide (ODDS) and bis(diisopropyl) thiophosphoryl disulfide (DIPDIS) were used in this study. DIPTOS when used alone produces NR vulcanizates with a moderate range of physical properties, whereas in conjunction with MBTS and DIPDIS it exhibits significant mutual activities. Morphological studies of the tensile‐fractured surfaces of the blend vulcanizates by scanning electron microscopy corroborate the physical data. Copyright © 2003 Society of Chemical Industry
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Keywords: NR–EPDM blends; cure synergism; diisopropyl thiophosphoryl‐N‐oxydiethylene sulfenamide (DIPTOS); scanning electron microscopy; two‐stage vulcanization

Document Type: Research Article

Affiliations: Polymer Science Unit, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700 032, India

Publication date: August 1, 2003

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