Poly-α-olefins ranging from poly-1-pentene to poly-1-octadecene with narrow polydispersities were synthesized with (CH3)2Si(2-methylbenz[e]indenyl)2ZrCl2 and methylaluminoxane at polymerization temperatures (Tp 's) ranging from −15 to 180 °C and were characterized by gel permeation chromatography, NMR spectroscopy, and differential scanning calorimetry. The molar masses of the homopolymers obtained with (CH3)2Si(2-methylbenz[e]indenyl)2ZrCl2 were notably higher than those of poly-α-olefins synthesized with other zirconium-based metallocenes under similar conditions. The temperature dependence of the molar mass distribution of the poly-α-olefins can be described by a common exponential decay function regardless of the investigated monomer. At Tp 's ranging from 20 to 100 °C, moderate isotacticity prevailed, but outside this temperature range, the polymers were less stereoregular.
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Br�ll et al. (2000) studied this question.