Abstract
The polymerization of ethylene with bis(iminoaryl)pyridyl iron precursor is reviewed, with emphasis on the preparation of polyolefin composites by the in situ polymerization procedure. The catalytic properties are described. The rate of the polymerization is linearly dependent on the concentration of the active catalyst and the ethylene concentration. Bimodal distributions arise depending on the concentration of aluminum alkyls. Aluminum alkyls are chain transfer reagents and give access to polymeryl aluminum compounds that lead to polyethylene with a hydroxyl terminus after oxidation with air. The bis(iminoaryl)pyridyl iron dichloride can be supported on alumina, silica, and magnesium salts to give active catalysts after activation with aluminum alkyls, or vice versa, that are thermally robust. The iron complexes can also be used to prepare polyolefin (nano)composites from ethylene after immobilization on the filler in combination with aluminum alkyls.
Keywords
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Abbreviations
- a.u.:
-
Arbitrary units
- BIR2P:
-
Bis(iminoaryl)pyridyl with R as the ortho substituent of the iminoaryl moiety
- C p :
-
Number of iron carrying alkyl chains
- DIBAL:
-
Di-isobutyl aluminum hydride
- d-MAO:
-
Dry MAO, MAO liberated from AlMe3
- DRIFT:
-
Diffuse reflectance infrared Fourier transform spectroscopy
- EBMAG:
-
Ethyl butyl magnesium
- EtOH:
-
Ethanol
- k p :
-
Rate constant for ethylene insertion in a iron alkyl bond
- MAO:
-
Methyl aluminoxane as the hydrolysis product of AlMe3
- Me:
-
Methyl substituent
- MMAO:
-
Modified MAO, containing methyl and t-butyl groups
- M n :
-
Number average molecular weight
- M w :
-
Weight average molecular weight
- PDI:
-
Polydispersity index (M w/M n)
- SEM:
-
Scanning electron microscopy
- TEAO:
-
Tetraethyl aluminoxane
- TEM:
-
Transmission electron microscopy
- TEOS:
-
Tetraethoxy silane
- TIBA:
-
Triisobutyl aluminum
- TMA:
-
Trimethyl aluminum
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Meyer, R.S.A., Luinstra, G.A. (2013). Iron Catalyst in the Preparation of Polyolefin Composites. In: Kaminsky, W. (eds) Polyolefins: 50 years after Ziegler and Natta II. Advances in Polymer Science, vol 258. Springer, Berlin, Heidelberg. https://doi.org/10.1007/12_2013_223
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