Tetraphenylethanes as initiators of radical polymerization. Part I. Living polymerization of methacrylates
Living polymerization has been attempted under conditions typical of radical polymerization by the formation of a polymer chain with endgroups dissociating into a macroradical and a low-molecular-weight radical. When using various tetraphenylethanes as initiators, it has been shewn that polymerization of methacrylic monomers takes place according to a completely novel, nor,-typical mechanism, that has not been hitherto described in the literature: it is a radical step-wise polymerization. Because the originally formed chain of oligomer/polymer can be extended either during the polymerization proces itself, or after a previous isolation of the product, this reaction can be defined as a living radical oligomerization/polymerization.
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