A method for the determination of the relative reactivities of monomers towards the 1-phenylethyl radical

Abstract

Several monomers have been polymerized using 1,1′-azobis(1-phenyl [1-^(13)C] ethane as initiator; the initiator fragments incorporated in the polymers have been examined by ^(13)C-NMR. The chemical shift for the enriched site in the end-group depends upon the nature of the attached monomeric unit. It is concluded that acenaphthylene is suitable as a reference monomer in comparisons of the reactivities of monomers towards the 1-phenylethyl radical (regarded as a model for the polystyrene radical) by consideration of end-groups in copolymers.

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