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Polymerization of 1,3‐butadiene with MgCl 2 ‐supported cobalt catalysts activated by ordinary alkylaluminums
Author(s) -
Takeuchi Masaki,
Shiono Takeshi,
Soga Kazuo
Publication year - 1995
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1995.210360107
Subject(s) - catalysis , polybutadiene , triphenylphosphine , chemistry , polymerization , cobalt , pyridine , 1,3 butadiene , polymer chemistry , nuclear chemistry , copolymer , inorganic chemistry , organic chemistry , polymer
MgCl 2 ‐supported CoBr 2 catalysts were prepared from mixture of MgCl 2 and CoBr 2 L 2 (L = triphenylphosphine or pyridine) in toluene. Polymerization of 1,3‐butadiene was conducted over the catalysts combined with ordinary alkylaluminums as cocatalyst. The CoBr 2 (PPh 3 ) 2 /MgCl 2 catalyst gave polybutadiene with approximately 80% of 1,2 units, whereas cis ‐1,4‐poly‐butadiene was obtained with the CoBr 2 (C 5 H 5 N) 2 /MgCl 2 catalyst. Addition of triphenylphospine to the latter catalyst caused a marked increase in the content of 1,2 units. The content of 1,2 units could be thus controlled in the range from 0 to 80% by changing the amount of triphenylphosphine. On the other hand, the CoBr 2 (PPh 3 ) 2 /MgCl 2 catalyst with very low content of CoBr 2 (PPh 3 ) 2 hardly displayed any activity. Addition of dimethoxydiphenylsilane to the catalyst gave polybutadiene containing 90 % of 1,2 units with a fairly high activity.