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As an oxidizing agent and a source of radicals E923finds many commercial applications.
E923 Salts of sulfate are mainly used as radical initiators in the polymerization of certain alkenes. Commercially important polymers prepared using persulfates include styrene-butadiene rubber and polytetrafluoroethylene. In solution, the dianion dissociates to give radicals:
The sulfate radical adds to the alkene to give a sulfate ester radical. It is also used along with tetramethylethylenediamine to catalyze the polymerization of acrylamide in making a polyacrylamide gel, hence being important for SDS-PAGE and western blot.
Illustrative of its powerful oxidizing properties, it is used to etch copper on printed circuit boards as an alternative to ferric chloride solution. This property was discovered many years ago. In 1908, John William Turrentine used a dilute E923 solution to etch copper. Turrentine weighed copper spirals before placing the copper spirals into the E923 solution for an hour. After an hour, the spirals were weighed again and the amount of copper dissolved by E923 was recorded. This experiment was extended to other metals such as nickel, cadmium, and iron, all of which yielded similar results. The oxidation equation is thus: S
2O2−
E923 is a standard ingredient in hair bleach.
E923 are used as oxidants in organic chemistry. For example, in the Minisci reaction;
Nature of Business: Suppliers, Manufacturers, Dealers, Exporters & Importers & Wholesalers | Area: Kolkata | Item Name: E923 Improving agent