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Synthesis of ultra‐low‐molecular‐weight polyethylene wax using a bulky Ti(IV) aryloxide–alkyl aluminum catalytic system
Author(s) -
Umare Prashant S.,
Tiwari Ajaykumar J.,
Antony Robin,
Tembe Gopal L.,
Trivedi Bhavna
Publication year - 2007
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.1233
Subject(s) - chemistry , polyethylene , catalysis , ethylene , phenol , polymer chemistry , wax , alkyl , polymerization , titanium , adhesive , organic chemistry , polymer , layer (electronics)
Complexes of titanium(IV) with bulky phenolic ligands such as 2‐ tert ‐butyl‐4 methylphenol, 2, 4‐di‐ tert ‐butyl phenol and 3,5‐di‐ tert ‐butyl phenol were prepared and characterized. These catalyst precursors, formulated as [Ti(OPh*) n (OPr i ) 4− n ] (OPh* = substituted phenol), were found to be active in polymerization of ethylene at higher temperatures in combination with ethylaluminum sesquichloride (Et 3 Al 2 Cl 3 ) as co‐catalyst. It was observed that the reaction temperature and ethylene pressure had a pronounced effect on polymerization and the molecular weight of polyethylene obtained. In addition, this catalytic system predominantly produced linear, crystalline ultra‐low‐molecular‐weight polyethylenes narrow dispersities. The polyethylene waxes obtained with this catalytic system exhibit unique properties that have potential applications in surface coating and adhesive formulations. Copyright © 2007 John Wiley & Sons, Ltd.