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Polymerizations of butadiene with Ni(acac) 2 ‐methylaluminoxane catalysts
Author(s) -
Endo Kiyoshi,
Uchida Yoshiki,
Matsuda Yuichi
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021971102
Subject(s) - methylaluminoxane , catalysis , polymer chemistry , chemistry , materials science , polymer science , organic chemistry , metallocene , polymerization , polymer
Polymerizations of butadiene (BD) with transition metals (MtX) and methylaluminoxane (MAO) catalysts were studied. Among the catalysts examined, nicke(II) acetylacetonate [Ni(acac) 2 ] in combination with MAO revealed the highest catalytic activities for the polymerization of BD, giving high molecular weight polymers consisting of mainly cis ‐1,4‐units in the microstructure. With Ni(acac) 2 ‐MAO catalyst, the overall activation energy for the polymerization of BD between 0°C and 60°C was estimated to be 18 kJ/mol. From a kinetic study, the rate equation for the polymerization of BD with the Ni(acac) 2 ‐MAO catalyst at 30°C can be expressed as follows: R p = [BD] 1.8 [Ni(acac) 2 ‐MAO] 0.9 . The polymerization mechanism of the polymerization of BD with the Ni(acac) 2 ‐MAO catalyst is discussed.