Abstract
Abstract In a former communication (Trans. Inst. Rubber Industry, 4, 493 (1929)) some results were presented of studies on the changes of rubber samples oxidized to an intense degree. For that investigation the oxidation temperature used was 70° C. (Geer Oven), while in the present paper results are given of experiments made at 100° C. and their relation to the results at the lower temperature are discussed. The experimental procedure was similar to that previously used, the preliminary stage being the sheeting out of small portions of the samples by passing them through the tightly closed cold rolls of a laboratory mill. The weighed samples were then suspended by strings in an ordinary steam oven fitted with an air inlet near the bottom and an outlet at the top. The progress of oxidation of each sample was noted from time to time by (a) determining the increase in weight, and (b) removing and estimating the amount of resinous matter present by extraction with acetone for 24 hours. In some instances the acetone extraction was preceded by an extraction with chloroform.
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