Vinyl acetate and acrylonitrile were copolymerized with Co(acac)3‐Al(C2H5)3 catalyst system in benzene at 40°C. The rate of copolymerization is linearly proportional to monomer concentration and catalyst concentrations up to a certain value. The overall activation energy was found to be 11.3 kcal/mole. The effect of hydroquinone on the rate of copolymerization indicates the presence of free radicals in this system. The possibility of simultaneous formation of coordinate anionic and free radical active sites has been proposed.
SynopsisMethyl methacrylate was polymerized a t 40°C with VOCls-AlEKI catalyst system in n-hexane. The rate of polymerization was proportional to catalyst and monomer concentration a t AI/V ratio of 2 and overall activation energy of 9.25 kcal/mole support a coordinate anionic mechanism of polymerization. The catalytic activity and stereospecificity of this catalyst system is discussed in comparison with that of VOClsAlEt:. catalyst system.
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