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>Structural characterization of vulcanizates. Part VII. TheN‐cyclohexylbenzothiazole‐2‐sulfenamide‐accelerated natural rubber–sulfur system
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Structural characterization of vulcanizates. Part VII. TheN‐cyclohexylbenzothiazole‐2‐sulfenamide‐accelerated natural rubber–sulfur system
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机译：Structural characterization of vulcanizates. Part VII. TheN‐cyclohexylbenzothiazole‐2‐sulfenamide‐accelerated natural rubber–sulfur system
AbstractThe crosslinking efficiency of sulfur in the vulcanization system comprising (in parts by weight) natural rubber (100), sulfur (1.5),N‐cyclohexylbenzothiazole‐2‐sulfenamide (2.37), zinc oxide (5), and lauric acid (1–10) is relatively insensitive to the lauric acid concentration and to the temperature of vulcanization (between 100 and 140°C.). The networks formed contain initially 8–11 combined sulfur atoms per chemical crosslink present, but this number falls progressively to about 4 as the reaction proceeds. The results are consistent with the intermediate formation of a rubber‐soluble complex of cyclohexylamine with zinc benzothiazolyl mercaptide. This complex is believed to be responsible also for the further slow crosslinking which the vulcanizates undergo on standing at room
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