Reinitiation reactions of poly(methyl methacrylate) with labile bound fragments of initiator

It has been found that poly(methyl methacrylate) prepared by polymerization at the presence of 3,3,4,4‐tetraphenyl hexane (TPH) causes the initiation of polymerization or copolymerization. By such an initiation it has been succeeded to prepare block methyl methacrylate‐styrene copolymers. It is concluded of the inverse proportionality between the polymerization efficiency and the degree of polymerization of the poly(methyl methacrylate) prepared under mentioned conditions that the polymerization is initiated by radicals, which are rising at the dissociation of TPH initiator bound on the ends of poly(methyl methacrylate) molecules.