Abstract
Abstract Soluble iron decreases the resistance of the GR-S polymer to aging. The effect of iron is greater than that of copper or manganese. The aging of an aluminum sulfate—coagulated polymer can be improved by the use of low-iron aluminum sulfate instead of the commercial grade of this material. The use of commercial aluminum sulfate as a coagulant gives a polymer somewhat superior in aging to one coagulated with salt and acid. The aging of GR-S vulcanizates is accelerated slightly by polymer-soluble iron. Relatively high iron concentrations are required to produce much effect. The effect of iron on vulcanizate aging is much less than in the case of polymer aging. The presence of iron increases the rate of oxygen absorption of GR-S polymer and vulcanizates, the effect being less in the latter case. The rate of oxygen absorption of aluminum sulfate—coagulated GR-S polymer is decreased by employing low-iron aluminum sulfate instead of the commercial grade. A polymer coagulated by commercial aluminum sulfa...
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