XPS and EXAFS characterization of Ziegler–Natta catalyst systems

Adilson Arli da Silva Filho; Maria do Carmo Martins Alves; João Henrique Zimnoch dos Santos

doi:10.1002/app.28310

journal article Apr 23, 2008

XPS and EXAFS characterization of Ziegler–Natta catalyst systems

Adilson Arli da Silva Filho Maria do Carmo Martins Alves João Henrique Zimnoch dos Santos

Journal of Applied Polymer Science Vol. 109 No. 3 pp. 1675-1683 · Wiley

View at Publisher Save 10.1002/app.28310

Abstract

AbstractA series of Ziegler–Natta catalysts, with and without diisobutylphtalate as an internal donor, were modified with alkylaluminum (triethylaluminum or diethylaluminum chloride) and an external donor (diisopropyldimethoxysilane or methyltrimethoxysilane), in increasing complexity. The resulting catalysts were characterized by X‐ray photoelectron spectroscopy and extended X‐ray absorption fine structure analysis (EXAFS) and evaluated in propylene polymerization. According to EXAFS oscillation, systems bearing diisobutylphtalate as an internal donor displayed a well‐defined pattern, suggesting a more ordered structure around the Ti atom. EXAFS data treatment provided two TiCl distances: ∼ 1.96 and 2.5 Å. The former was shown to have a linear dependence on the Ti (2p3/2) binding energy as the catalyst is modified with TEA or with external donors. Conversely, the longest distance is reduced as Ti (2p3/2) binding energy increases with catalyst modification. Correlations involving the catalyst activity, Ti (2p3/2) binding energy, and TiCl distances could be denoted. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008

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Details

Published: Apr 23, 2008
Vol/Issue: 109(3)
Pages: 1675-1683
License: View

Authors

A

Adilson Arli da Silva Filho

M

Maria do Carmo Martins Alves

J

João Henrique Zimnoch dos Santos

Cite This Article

Adilson Arli da Silva Filho, Maria do Carmo Martins Alves, João Henrique Zimnoch dos Santos (2008). XPS and EXAFS characterization of Ziegler–Natta catalyst systems. Journal of Applied Polymer Science, 109(3), 1675-1683. https://doi.org/10.1002/app.28310

XPS and EXAFS characterization of Ziegler–Natta catalyst systems

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