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Iron Catalyst in the Preparation of Polyolefin Composites

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Polyolefins: 50 years after Ziegler and Natta II

Part of the book series: Advances in Polymer Science ((POLYMER,volume 258))

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.

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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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  1. Institut für Technische und Makromolekulare Chemie, Fachbereich Chemie, Universität Hamburg, 20146, Hamburg, Germany

    Robert S. A. Meyer & Gerrit A. Luinstra

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  1. Dept. of Chemistry Inst. for Techn. and Macromol. Chemistry, University of Hamburg, Hamburg, Germany

    Walter Kaminsky

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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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