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Living and Controlled Anionic Polymerization of Methacrylates and Acrylates in the Presence of Tetraalkylammonium Halide-Alkylaluminum Complexes in Toluene.

The size of both the cation and the anion of added NR4 X influences the rate of living polymerization of acrylates and methacrylates with alkylaluminum compounds. This controlled reaction, which occurs near to room temperature, provides unimodal polymers with narrow molecular-weight distributions. The complex shown to the right is suggested as a possible active species. R=Me, Et, nBu; R'=Me, Et; X=Cl, Br, I.