Synthesis and olefin polymerization using supported and non-supported geometry constrained titanium complexes

Mercedes Galan-Fereres; Thomas Koch; Evamarie Hey-Hawkins; Moris S. Eisen

doi:10.1016/S0022-328X(98)01140-1

Synthesis and olefin polymerization using supported and non-supported geometry constrained titanium complexes

Mercedes Galan-Fereres^*, Thomas Koch, Evamarie Hey-Hawkins, Moris S. Eisen

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

71 Scopus citations

Abstract

The synthesis of a constrained geometry titanium complex and its immobilization on different supports have been studied for the catalytic polymerization of ethylene, propylene and styrene. The formation of higher molecular weight polymers was found in the heterogeneous system as compared to the homogenous parent for polyethylene and polypropylene. Polymerization of propylene yielded atactic products with elastomeric properties due to long polymer chains. However, syndiotactic polymers were formed in the polymerization of styrene. Catalytic activity was found to be dependent on MAO and titanium concentration; the higher the metal concentration the lower the activity of the catalyst. The activity of the heterogeneous system was determined as a function of time, and a first-order deactivation pathway was found at room temperature. The type of solvent (toluene or CH₂Cl₂) also played an important role in the polymerization of ethylene and styrene, although different tendencies were found for either monomers.

Original language	English
Pages (from-to)	145-155
Number of pages	11
Journal	Journal of Organometallic Chemistry
Volume	580
Issue number	1
DOIs	https://doi.org/10.1016/S0022-328X(98)01140-1
State	Published - 15 May 1999
Externally published	Yes

Keywords

Geometry constrained catalysts
Heterogeneous Ziegler-Natta polymerization
Homogeneous Ziegler-Natta polymerization
Titanium complexes
α-Olefin polymerization

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10.1016/S0022-328X(98)01140-1

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title = "Synthesis and olefin polymerization using supported and non-supported geometry constrained titanium complexes",

abstract = "The synthesis of a constrained geometry titanium complex and its immobilization on different supports have been studied for the catalytic polymerization of ethylene, propylene and styrene. The formation of higher molecular weight polymers was found in the heterogeneous system as compared to the homogenous parent for polyethylene and polypropylene. Polymerization of propylene yielded atactic products with elastomeric properties due to long polymer chains. However, syndiotactic polymers were formed in the polymerization of styrene. Catalytic activity was found to be dependent on MAO and titanium concentration; the higher the metal concentration the lower the activity of the catalyst. The activity of the heterogeneous system was determined as a function of time, and a first-order deactivation pathway was found at room temperature. The type of solvent (toluene or CH2Cl2) also played an important role in the polymerization of ethylene and styrene, although different tendencies were found for either monomers.",

keywords = "Geometry constrained catalysts, Heterogeneous Ziegler-Natta polymerization, Homogeneous Ziegler-Natta polymerization, Titanium complexes, α-Olefin polymerization",

author = "Mercedes Galan-Fereres and Thomas Koch and Evamarie Hey-Hawkins and Eisen, {Moris S.}",

note = "Funding Information: The research was supported by the German–Israel Foundation for scientific research and development (GIF) under grant agreement no. I-0437-142.05/95, by the Technion V.P.R. Fund Promotion of Sponsor Research and by the Loewegart Research Fund. M. Galan-Fereres thanks the Ministry of Education and Sciences of Spain for a postdoctoral fellowship.",

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doi = "10.1016/S0022-328X(98)01140-1",

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AU - Galan-Fereres, Mercedes

AU - Koch, Thomas

AU - Hey-Hawkins, Evamarie

AU - Eisen, Moris S.

N1 - Funding Information: The research was supported by the German–Israel Foundation for scientific research and development (GIF) under grant agreement no. I-0437-142.05/95, by the Technion V.P.R. Fund Promotion of Sponsor Research and by the Loewegart Research Fund. M. Galan-Fereres thanks the Ministry of Education and Sciences of Spain for a postdoctoral fellowship.

PY - 1999/5/15

Y1 - 1999/5/15

N2 - The synthesis of a constrained geometry titanium complex and its immobilization on different supports have been studied for the catalytic polymerization of ethylene, propylene and styrene. The formation of higher molecular weight polymers was found in the heterogeneous system as compared to the homogenous parent for polyethylene and polypropylene. Polymerization of propylene yielded atactic products with elastomeric properties due to long polymer chains. However, syndiotactic polymers were formed in the polymerization of styrene. Catalytic activity was found to be dependent on MAO and titanium concentration; the higher the metal concentration the lower the activity of the catalyst. The activity of the heterogeneous system was determined as a function of time, and a first-order deactivation pathway was found at room temperature. The type of solvent (toluene or CH2Cl2) also played an important role in the polymerization of ethylene and styrene, although different tendencies were found for either monomers.

AB - The synthesis of a constrained geometry titanium complex and its immobilization on different supports have been studied for the catalytic polymerization of ethylene, propylene and styrene. The formation of higher molecular weight polymers was found in the heterogeneous system as compared to the homogenous parent for polyethylene and polypropylene. Polymerization of propylene yielded atactic products with elastomeric properties due to long polymer chains. However, syndiotactic polymers were formed in the polymerization of styrene. Catalytic activity was found to be dependent on MAO and titanium concentration; the higher the metal concentration the lower the activity of the catalyst. The activity of the heterogeneous system was determined as a function of time, and a first-order deactivation pathway was found at room temperature. The type of solvent (toluene or CH2Cl2) also played an important role in the polymerization of ethylene and styrene, although different tendencies were found for either monomers.

KW - Geometry constrained catalysts

KW - Heterogeneous Ziegler-Natta polymerization

KW - Homogeneous Ziegler-Natta polymerization

KW - Titanium complexes

KW - α-Olefin polymerization

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DO - 10.1016/S0022-328X(98)01140-1

M3 - 文章

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JF - Journal of Organometallic Chemistry

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Synthesis and olefin polymerization using supported and non-supported geometry constrained titanium complexes

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