Carbon nuclear magnetic resonance characterization of ethylene-propylene-1-octadecene terpolymers and comparison with ethylene-propylene-1-hexene and 1-decene terpolymers

In this paper, we report the complete ¹³C NMR characterization of a set of ethylene-propylene-1-octadecene terpolymers obtained with the metallocenic system rac-ethylene bis-indenyl zirconium dichloride, using different comonomer ratios. A detailed study of ¹³C NMR chemical shifts, triad sequence distributions, monomer average sequence lengths and reactivity ratios for these terpolymers is presented. The incorporations of 1-octadecene were superior of those obtained using 1-hexene and 1-decene in the same conditions. Catalytic activities of terpolymers of ethylene-propylene and α-olefins (α-olefins:1-hexene, 1-decene and 1-octadecene) were compared showing that they increase with the amount of propylene in the feed.