Abstract
The coagulation and reversal of charge of a styrenebutadiene rubber latex (Naugatex 2740) by freshly prepared and aged aluminum nitrate solutions has been studied as a function of pH. The entire “[Al(NO3)3]-pH” and “[Al2(SO4)3]-pH” domains have been established giving the regions of uncoagulated and coagulated latex, as well as the stabilization region due to charge reversal. The results are similar to those obtained earlier with silver halide sols. Some differences are apparently due to interactions of hydrolyzed aluminum ions with the stabilizing agent, Dresinate 214. This work represents another confirmation of previous findings that the critical coagulation concentrations of a metal counterion varies as a consequence of the change in charge due to hydrolysis. It also shows that only hydrolyzed metal ions may adsorb in amounts sufficient to cause charge reversal.
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