Ethylene Polymerization Studies with an MAO Synthesized by a Non-Hydrolytic Synthetic Route

Kannan, R. Sayee; Cramail, Henri; Deffieux, Alain; François, Philippe; Momtaz, Ardéchir

doi:10.1002/1521-3927(20021001)23:14<829::aid-marc829>3.0.co;2-5

Cited by 15 publications

(14 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We presume that an inadvertent entry of traces of oxygen or water may enable the formation of small amounts of Me 2 Al-O-containing moieties that are responsible for the increase in catalytic activity observed. [8] A series of ethylene polymerizations in the presence of MeDIP(2,6-iPrPh) 2 FeCl 2 /trialkylaluminium (TEA, THA, TOctA, TiBA) catalytic systems was performed using various Al/Fe ratios. As shown in Table 1, the catalytic activities obtained in the presence of primary trialkylaluminium activators (TEA, THA) at Al/Fe ratios of 250-500 are much higher (2500-3000 kg-PE/mol-Fe Á bar Á h) than those obtained with TMA, and are almost in the same order of magnitude as those found for systems activated with MAO.…”

Section: Resultsmentioning

confidence: 90%

Influence of Alkylaluminium Activators and Mixtures thereof on Ethylene Polymerization with a Tridentate Bis(imino)pyridinyliron Complex

Kannan

Cramail

Deffieux

et al. 2003

Macromol. Rapid Commun.

Self Cite

View full text Add to dashboard Cite

The effect of various alkylaluminium compounds and their mixtures on ethylene polymerization catalyzed with a tridentate bis(imino)pyridinyliron catalyst is studied. Triethylaluminium and trihexylaluminium are good cocatalysts but yield polyethylenes with broad molar mass distribution (MMD) whereas triisobutylaluminium, a less efficient activator, gives polyethylenes with unimodal and narrow MMD. Specific mixtures of branched and linear alkylaluminium compounds yield highly active catalytic systems and polyethylenes with unimodal and tunable MMD.SEC traces of PE prepared with iron catalyst and (1) TEA, (2) TiBA, and (3) THA (Al/Fe = 250) as cocatalysts.magnified imageSEC traces of PE prepared with iron catalyst and (1) TEA, (2) TiBA, and (3) THA (Al/Fe = 250) as cocatalysts.

show abstract

Section: Resultsmentioning

confidence: 90%

Influence of Alkylaluminium Activators and Mixtures thereof on Ethylene Polymerization with a Tridentate Bis(imino)pyridinyliron Complex

Kannan

Cramail

Deffieux

et al. 2003

Macromol. Rapid Commun.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The development of metallocenes as olefin polymerization catalysts on an industrial scale requires a dramatic lowering of the content of costly aluminum‐based co‐catalysts such as MAO. It is of particular interest to explore new routes that allow a reduction in the [Al]:[Zr] ratio while maintaining an optimal catalytic activity for olefin polymerization 6…”

Section: Resultsmentioning

confidence: 99%

UV–visible spectroscopy for zirconocene activation by MAO in olefin polymerization: activity versus wavenumber

Alonso‐Moreno¹,

Carrión²,

Carrillo‐Hermosilla³

et al. 2009

Applied Organom Chemis

View full text Add to dashboard Cite

Activation of ansa-zirconocenes of the type Rac [Zr{1-Me 2 Si(3-R-(η 5 -C 9 H 5 ))(3-R -(η 5 -C 9 H 5 ))}Cl 2 ] [R = Et, R = H (1); R = Pr, R = H (2); and R = Et, R = Pr (3), R, R = Me (4) and R, R = Bu (5)] by MAO has been studied by UV-visible spectroscopy. Compounds 1-3 have been tested in the polymerization of ethylene at different Al : Zr ratios. UV-vis spectroscopy was used to determine a correlation between the electronic structures of (1-5) and their polymerization activity.

show abstract

“…Indeed, the reaction between TMA and organic compounds bearing a carbonyl group was recently disclosed as an efficient route to aluminium alkoxide derivatives (MAO‐type compounds) that can be used as metallocene activators 31,35–37. Our interest for such activators led us to a detailed investigation of the elementary reactions between TMA and benzoic acid (BA).…”

Section: Resultsmentioning

confidence: 99%

Non‐Hydrolytic Route to Aluminoxane‐Type Derivative for Metallocene Activation towards Olefin Polymerisation

Dalet

Cramail

Deffieux

2004

Macro Chemistry & Physics

Self Cite

View full text Add to dashboard Cite

Summary: Access to methylaluminoxane‐type derivatives by a non‐hydrolytic route is described. The procedure involves the reaction between trimethylaluminium (TMA) and benzoic acid (BA) at temperatures comprised from 20 to 100 °C in toluene. The structure of the different aluminic derivatives formed for different ratios R = TMA/BA as well as the reaction pathways leading to these products were investigated by 1H NMR spectroscopy at different temperatures. The monomeric and/or oligomeric “Me2AlOAlMe2” species issued from the reaction between BA and TMA were found to methylate and then activate (cationize) rac‐Et(Ind)2ZrCl2 as shown by UV/visible spectroscopy analysis. This is further confirmed by successful hex‐1‐ene polymerisations carried out in the presence of such activators.

show abstract

Ethylene Polymerization Studies with an MAO Synthesized by a Non-Hydrolytic Synthetic Route

Cited by 15 publications

References 6 publications

Influence of Alkylaluminium Activators and Mixtures thereof on Ethylene Polymerization with a Tridentate Bis(imino)pyridinyliron Complex

Influence of Alkylaluminium Activators and Mixtures thereof on Ethylene Polymerization with a Tridentate Bis(imino)pyridinyliron Complex

UV–visible spectroscopy for zirconocene activation by MAO in olefin polymerization: activity versus wavenumber

Non‐Hydrolytic Route to Aluminoxane‐Type Derivative for Metallocene Activation towards Olefin Polymerisation

Contact Info

Product

Resources

About