Ethylene was copolymerized with linear, non-conjugated dienes by the metallocene catalyst system Cp2ZrCl2/MAO at several temperatures from 20 to 80°C. The dienes were 1,5-hexadiene (HD), 1,7-octadiene (OD) and 7-methyl-1,6-octadiene (MOD). Incorporation of the dienes was studied by 1H and 13C NMR and FTIR. Polymerization conditions had a dramatic effect on the degree of crosslinking of the product. At polymerization temperatures from 20 to 65°C the copolymers of ethylene and HD or OD were nearly totally crosslinked, whereas at 80°C the degree of crosslinking was consistently under 10%. When MOD was used as comonomer the degree of crosslinking did not increase above 40% even for copolymer produced at 20°C.
Pietikäinen, P., Seppälä, J., Ahjopalo, L., & Pietilä, L-O. (2000). Copolymerization of ethylene and non-conjugated dienes with Cp2ZrCl2/MAO catalyst system: Effect of polymerization temperature on the copolymer structure. European Polymer Journal, 36(1), 183-193. https://doi.org/10.1016/S0014-3057(99)00053-1