Abstract
Copolymerization of ethylene with vinyl acetate was carried out at room temperature by the ternary catalyst system consisting of equimolar amounts of AlEt3, ZnCl2 and CCl4. By solvent fractionation and thin layer chromatography analysis, the copolymerization product was found to consist of two different copolymer fractions. One was the 1:1 alternating copolymer and the other was identified with the copolymer produced by the usual free radical initiator under the same reaction conditions. Two different catalyst sites were assumed, i.e., the site of the usual free radical polymerization and the one responsible for the 1:1 alternating copolymerization. The addition of pyridine to the ternary catalyst system decreased mainly the yield of the 1:1 alternating copolymer fraction. Therefore, it was suggested that the coordination of monomer was essential for the catalyst site of the alternating copolymerization.
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