Studies of Organic Accelerators. XVI. Part 4. Detection and Analysis of Organic Accelerators. Detection of Guanidine Accelerators in Vulcanized Rubber

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Abstract
Rubber vulcanized with a thiuram accelerator such as tetramethylthiuram monosulfide or disulfide was tested with the author's cobalt oleate reagent after extraction with acetone and solution of the residue from the acetone extract in benzene, by testing the benzene extract of such vulcanized rubber. In all cases a characteristic yellowish green coloration of dithiocarbamate was observed. From this it is concluded that thiuram accelerators are transformed into dithiocarbamates during vulcanization. Accordingly, it is difficult to ascertain whether accelerators in vulcanized rubber were originally present as thiuram compounds, except when the rubber is undercured or when an excessive amount of accelerator is used. Here, too, the greater part is detected as dithiocarbamate. An experimental proof of the mechanism of acceleration is offered.

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