摘要：

This study employed the 13 C-NMR spectroscopy to investigate the influence of the increase of the comonomer concentration on the microstruture of ethylene/1-hexene and ethylene/1-octene copolymers obtained by the use of MeSiCp 2 ZrCl 2 , Cp 2 ZrCl 2 , Et[Ind] 2 ZrCl 2 and [Ind] 2 ZrCl 2 catalysts. For both comonomers butyl or hexyl branches were isolated between ethylene blocks. As the α-olefin concentration in the copolymer increased, butyl or hexyl branches became closer, some of them, separated by only one or two ethylene units. Incorporation of α-olefin in the copolymer was higher for the bridged catalysts, MeSiCp 2 ZrCl 2 , and Et[Ind] 2 ZrCl 2 than for the unbridged ones. The α-olefin size did not seem to effect its reactivity towards ethylene.

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