Abstract
Abstract The polymerization of vinyl monomer with the bis (ethyl acetoacetato)copper(n) (Cu(eacac2) and the sodium tetraphenylborate (TPB) system was investigated. This binary system was found to initiate effectively the radical polymerization of methyl methacrylate (MMA) and methyl acrylate (MA). The polymerization of MMA with the Cu(eacac2)/TPB system was studied kinetically in acetone. The overall activation energy of the polymerization was calculated to be 15.8 kcal/mol. This value is a little lower than that (17.6 kcal/mol) for the polymerization of MMA with Cu(eacac)2 alone. The polymerization rate (Rp) is represented by The high order for the monomer concentration suggests participation of the monomer in the initiation process in this polymerization. This is supported by examination of the visible and ESR spectra of the Cu(eacac)2/TPB/MMA/acetone system. Reduction of Cu (II) to Cu(I) was observed from the ESR spectrum. To elucidate the initiation mechanism, the spin trapping technique was applied t...
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