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Copolymerization of 2‐butene and ethylene with catalysts based on titanium and zirconium complexes
Author(s) -
Ahn C.H.,
Tahara M.,
Uozumi T.,
Jin J.,
Tsubaki S.,
Sano T.,
Soga K.
Publication year - 2000
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(20000401)21:7<385::aid-marc385>3.0.co;2-w
Subject(s) - copolymer , polymerization , ethylene , propene , butene , metallocene , polymer chemistry , 1 butene , catalysis , monomer , titanium , isomerization , zirconium , materials science , polymer , chemistry , organic chemistry
The polymerization of 2‐butene and its copolymerization with ethylene have been investigated using four kinds of dichlorobis( β ‐diketonato)titanium complexes, [ArN(CH 2 ) 3 NAr]TiCl 2 (Ar = 2,6‐ i Pr 2 C 6 H 3 ) and typical metallocene catalysts. The obtained copolymers display lower melting points than those produced of homopolyethylene under the same polymerization conditions. 13 C NMR analysis indicates that 9.3 mol‐% of 2‐butene units were incorporated into the polymer chains with Ti(BFA) 2 Cl 2 ‐MAO as the catalyst system. With the trans ‐2‐butene a higher copolymerization rate was observed than with cis ‐2‐butene. A highly regioselective catalyst system for propene polymerization, [ArN(CH 2 ) 3 NAr]TiCl 2 complex using a mixture of triisobutylaluminium and Ph 3 CB(C 6 F 5 ) 4 as cocatalyst, was found to copolymerize a mixture of 1‐butene and trans ‐2‐butene with ethylene up to 3.1 mol‐%. Monomer isomerization‐polymerization proceeds with typical metallocene catalysts to produce copolymers consisting of ethylene and 1‐butene.