Vinyl Polymerization

XX. Radical Polymerization of Butyl Acrylate or Methacrylate: Effect of Dimethylaniline on the Polymerization

Abstract

A study of the polymerizations of butyl acrylate or methacrylate initiated by 2, 2′-azobisisobutyronitrile in the presence or absence of dimethylaniline at 60°C has been made. In the absence of dimethylaniline, it was proved that the initial rate of polymerization, Rp, could be expressed by the equation:
Rp=k {m}[ABIN]
where [M] and [ABIN] are the initial concentrations of the monomer and 2, 2′-azobisisobutyronitrile respectively. When dimethylaniline was added to the polymerization system of both monomers, it was found to appear an induction period in relation to the concentration of dimethylaniline. These inhibitions by dimethylaniline were not observed in the polymerization of usual monomers such as styrene, methyl methacrylate and acrylonitrile.