Notes on the Method of Roberts for the Analysis of Raw Rubber

Abstract
1. When using the method of Roberts, it is necessary to work in an atmosphere of nitrogen and with solvents free of peroxides, at least in the first phase of separation. 2. The product isolated by Roberts, which has been named by him “caoutchol”, is an oxidation product of rubber hydrocarbon. 3. The “modified” method of Roberts, i.e., working under nitrogen, must not be used as a quantitative method when there is a great variation in the “caoutchol” content of the rubber. 4. The results depend on the temperature at which the analysis is carried out. 5. When used with exclusion of oxidation, the method of Roberts may prove to be a means of detecting oxidation products in raw rubber.

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