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Synthesis of linear low density polyethylene (LLDPE) by in situ copolymerization with novel cobalt and zirconium catalysts
Author(s) -
Wang Hang,
Ma Zhi,
Ke Yucai,
Hu Youliang
Publication year - 2003
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.1282
Subject(s) - methylaluminoxane , zirconium , catalysis , polyethylene , cobalt , linear low density polyethylene , copolymer , polymer chemistry , monomer , ethylene , materials science , selectivity , polymerization , polymer , inorganic chemistry , metallocene , chemistry , organic chemistry , composite material , metallurgy
New cobalt catalysts {[2,6‐(CH 3 C=NAr) 2 C 5 H 3 N]CoCl 2 } (Ar=2‐methyl‐4‐methoxyphenyl, 1 ) and (Ar=2,4‐dimethylphenyl,2) were synthesized and found to exhibit good selectivity for α‐olefins with methylaluminoxane (MAO) as co‐catalyst. With only ethylene as the feed monomer cobalt catalysts 1 or 2 can be coupled with zirconium catalyst Dichloro [ rac ‐ethylenebis(indenyl)]Zirconium (IV) rac ‐EtInd 2 ZrCl 2 ( 3 ) to produce linear low density polyethylene by in situ polymerization. Spectra of resulting materials exhibit ethyl, butyl and long‐chain branches in the backbone of polyethylene. The ratio of Co/Zr and Δ t , which is defined as the interval between introductions of two catalysts into the reactor, influenced catalytic activity and the resulting materials greatly. Compatibility and complementary behaviour of different catalysts proved to be two most important factors for in situ copolymerization. Copyright © 2003 Society of Chemical Industry