Abstract
Abstract The nature of colloidal solutions of rubber is not yet fully explained in spite of the numerous investigations on the subject which have been carried out. It is well known that the viscosity of these solutions is diminished greatly by heating, by standing, by the action of oxygen and light, and by acids. In the present paper the influence of precipitating agents such as acetone and ethyl alcohol on the change in viscosity of rubber solutions at various temperatures was studied. Smoked sheet was used as the raw material. It was purified from its filtered benzene solution by precipitation once with alcohol and twice with acetone. An Ostwald viscosimeter of brown colored glass with a capillary diameter of 0.7 millimeter and 14.5 centimeters long was used.
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