Fundamental Studies on the Attributes of Organic Accelerators. XII. Action of Organic Bases on Rubber Sols

Abstract

Abstract 1. To confirm the action of organic acids on rubber sols, small proportions of butyric, valeric, propionic, monochloroacetic, bromoacetic, p-bromobenzoic, and o-iodobenzoic acids, respectively, were added to dilute solutions of rubber in benzene, and the viscosity-time curves were determined for each case. 2. That organic acids, as in the case of organic bases, cause the disaggregation of rubber was determined from the character of the changes in the viscosity when the acids were added. 3. Among organic acids, only o-iodobenzoic acid caused a lowering of the viscosity of a rubber sol, similar to the lowering by the author's C-type accelerators, and the depolymerization of rubber caused by the addition of this acid is due to the presence of iodine in its molecule. Furthermore, the characteristic behavior of C-type accelerators with rubber sols is attributable to the presence of such reactive groups in the molecule.