Synthesis of ethylene-a-olefin alternating copolymers with Et(1-Ind)(9-Flu)ZrCl2-MAO catalyst system

摘要

Full Paper: Copolymerizations of ethylene and alpha-olefins (4-methyl-1-pentene, 1-hexane, 1-decane and 1-hexadene) 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 in the misinsertions during the polymerizations are investigated in detail from dyad and triad distributions estimated by C-13 NMR analysis of copolymers. A reactivity ratio, r(E)(B), was obtained for ethylene-1-hexane 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. References: 21