Abstract
AbstractThe polyaminocarboxylic acids, ethylenediaminetetraacetic acid (EDTA), cyclohexanediaminetetraacetic acid (CDTA), and diethylenetriaminepentaacetic acid (DTPA) have been used to chelate the chromous and chromic ions when the system chromous ion—hydrogen peroxide is being used as an initiator for the emulsion polymerization of styrene. With CDTA and DTPA the zero‐order rates of polymerization increase continuously with increasing pH but with EDTA the zero‐order rate is constant over the range pH 5–7 and increases rapidly above pH 7. These results are to be anticipated from the variation of the redox potential of the chromous ion‐chromic ion‐chelating agent system with pH, since with CDTA and DTPA the redox potential decreases continuously with pH while with EDTA the redox potential varies only slightly over the range pH 5–7.
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