New Initiators for Controlled Radical Polymerization of Acrylic Monomers.

摘要

Polymerization of acrylic monomers was redox initiated by mixtures (1:1) of transition metal derivatives (acetates, metallocenes) with arenediazonium salts. In most cases, molecular weights increase with the conversion and polydispersities are lower than in a typical radical or anionic polymerization at these temperatures. Trapping experiments and relative monomer reactivities based on copolymerization studies indicate that these polymerizations proceed via a radical mechanism. The improved polymerization control can be ascribed to an equilibrium between growing radicals and dormant persistent radicals.