Copolymerizations of ethylene and α-olefins (4-methyl-1-pentene, 1-hexene, 1-decene and 1-hexadecene) were carried out with Et(1-Ind)(9-Flu)ZrCl2-MAO as the catalyst system. The degree of alternation in the resulting copolymers is higher than 92.1% for all the copolymers and close to 100% for ethylene-1-decene copolymer. Copolymerization behaviours focusing on the misinsertions during the polymerizations are investigated in detail from dyad and triad distributions estimated by 13C NMR analysis of copolymers. A reactivity ratio, rBE, was obtained for ethylene-1-hexene copolymers using a simplified two sites alternating mechanism and found to be 8.7, which is the same order of that reported in ethylene-propene copolymerizations with Me2C(3-RCp)(Flu)ZrCl2-MAO as the catalyst system.
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Uozumi et al. (2000) studied this question.