. Journal. ried in a desiccator and iiu-or-poratetl on the mixing maoliine with a slow-curingcivpe rubber at tlie siMue time jvs the sulphur, jisin previous experiments. Threi samples weretaken, including the control, ivs follows :— Kef. No. lotj A. Control siuiiple of slow curingrubber. 450 grius. — A* grms. sulphur. Ref. Xo. 156 B. Control sample of slow curingrubber. 450 grms. - 50 grms. sulphur — 10 gnus, decomposed casein. Kef. No. 150 C. Control sample of slow curingrubber. 440 grms. 4- 50 gims. sulphur — 10 gnus, decomposed casein. In sample Xo. 15(5 B, the sulphiu- is added tothe same
. Journal. ried in a desiccator and iiu-or-poratetl on the mixing maoliine with a slow-curingcivpe rubber at tlie siMue time jvs the sulphur, jisin previous experiments. Threi samples weretaken, including the control, ivs follows :— Kef. No. lotj A. Control siuiiple of slow curingrubber. 450 grius. — A* grms. sulphur. Ref. Xo. 156 B. Control sample of slow curingrubber. 450 grms. - 50 grms. sulphur — 10 gnus, decomposed casein. Kef. No. 150 C. Control sample of slow curingrubber. 440 grms. 4- 50 gims. sulphur — 10 gnus, decomposed casein. In sample Xo. 15(5 B, the sulphiu- is added tothe same amo\int of raw rubber as in the controland in Uef. No. 150 C allowance is made for the10 grms. of decomposed casein. The vulcanisation results are given in TaVile Diagram Y., shewing curves at 2i hours cure. Table XVI. •a g el IP -sg=. i els 13 = » £ lit = s s 1 ^•a n S5-2 Hours. Eovirs. A. B. AxB. 156 A. .. 3 Si 1-20 958 1149 156 B. .. 21 2I 1-36 963 1309 156 C. .. 2i 2J 1-30 961 1249. Load. z\ hrs LOAD. g<;HRS\ As will be seen, there is a marked accelerationin the rate of cure of the rubber to which thean»robically decomposed casein has been added,demonstrating the formation of an acceleratingagent or catalyst from the casein, which itself,under the conditions of employed, had noeffect on the rate of cure. Both samples 150 Band 150 C are very much over-cured at 3i houisand quite brittle. Experiment 17.—Fiutlier supplies of <asein andpeptone were obtained and tlie previous experi-meutii all repeated and controlled in one experi-ment. The following series was prejiared :— 178 A. Control. 450 grms. rubber + 50 gnus. B. 10 anaerobically decomposed casein — 450 rubber -^ 50 grms. C. 10 grms. aerobically decomposed casein -t- 450 rubber -r 50 grms. sulphur. 17S D. 10 gnus, undecomposod casein + 450 rubber + 50 grms. E. 10 g]-ms. peptone -:- 450 rubber + 50 \dphiu. The vulcanisation results a
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
