Abstract
Polymerization of trans-2-butene with (α-diimine)Ni(II) complex in combination with R3Al (R=CH3, C2H5, i-C4H9), Et2AlCl, EtAlCl2 and methylaluminoxane (MAO) was investigated. Et2AlCl and EtAlCl2 as well as MAO were found to be an effective cocatalyst for the polymerization of trans-2-butene to give a high molecular weight of the polymer in good yields, but R3Al did not give any polymers. In contrast to MMAO catalyst system, a less amount of Et2AlCl to (α-diimine)Ni(II) is enough to reach a high active for the polymerization, and (α-diimine)Ni(II)/Et2AlCl catalyst gave an optimum rate at the Al/Ni mole ratio of about 20 for the polymerization of trans-2-butene. The results obtained from a kinetic study demonstrate that the control of molecular weight is possible in the polymerization of trans-2-butene with (α-diimine)Ni(II)/Et2AlCl catalyst. The polymer obtained with (α-diimine)Ni(II)/Et2AlCl catalyst at 20 °C consists of –CH2–CH2–CH(CH3)– units and minor units derived from 1-butene produced by isomerization from trans-2-butene. Such minor structures can be negligible by decreasing the polymerization temperature.
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Endo, K., Kondo, Y. Polymerization of trans-2-Butene with (α-Diimine)Ni(II) Complex in Combination with Et2AlCl. Polym J 38, 1160–1164 (2006). https://doi.org/10.1295/polymj.PJ2006058
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DOI: https://doi.org/10.1295/polymj.PJ2006058