Phthalyl peroxide as a polymerization initiator

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Abstract
Polymeric phthalyl peroxide was used as an initiator for the polymerization of styrene at 60°C. The peroxide is initially partially insoluble in the monomer, but decomposes and becomes soluble during the course of the polymerization. The intrinsic viscosity of the polymer formed increases with increasing conversion and at about 65–70% conversion becomes higher than would arise from a monoradical‐initiated polymerization proceeding at the same rate.