SYNTHESIS AND REACTIVITY OF METAL-CONTAINING MONOMERS .28. LOW-TEMPERATURE RADICAL POLYMERIZATION OF ZINC, BARIUM, MAGNESIUM, AND LEAD ACRYLATES UNDER THE ACTION OF ORGANOCOBALT INITIATORS
Bs. Selenova et al., SYNTHESIS AND REACTIVITY OF METAL-CONTAINING MONOMERS .28. LOW-TEMPERATURE RADICAL POLYMERIZATION OF ZINC, BARIUM, MAGNESIUM, AND LEAD ACRYLATES UNDER THE ACTION OF ORGANOCOBALT INITIATORS, Russian chemical bulletin, 42(3), 1993, pp. 453-457
The polymerization of diacrylates of the nontransition metals Mg, Zn,
Ba, and Pb, which proceeds at low temperatures (5-10-degrees-C) with t
he complexes of alkylcobalts with tridentate Shiff bases (RCo) as init
iators, was studied. The radical mechanism of the process was proved w
ith the aid of free radical scavengers. The polymerization kinetics is
given by the equation W(n) = k [M] . [RCo]0.75. The influence of the
nature of the metal in the monomer and the alkyl ligand in the initiat
or on the polymerization process was discussed. Low temperatures promo
te the formation of polymers with high molecular weights and a predomi
nantly syndiotactic structure. The effect of the steric hindrances ari
sing during polymerization due to the formation of a three-dimensional
cross-linked structure in the metal-containing polymer on the microst
ructure of polymer chain and on polymerization kinetics was considered
.