Propylene Polymerization on Titanium-Magnesium Catalysts, 3. Influence of the Products Resulting from the Interaction of Trialkylaluminum with Aromatic Esters on the Activity and Stereospecificity Full article
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Makromolekulare Chemie up to 1993, continued as Macromolecular Chemistry and Physics
ISSN: 0025-116X |
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| Output data | Year: 1984, Volume: 185, Number: 11, Pages: 2377-2385 Pages count : 9 DOI: 10.1002/macp.1984.021851115 | ||
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Abstract:
The influence of the conditions of interaction between AlR3 and aromatic esters (D) and of the products formed on the activity and stereospecificity of the actalytic system TiCl4/ethyl benzoate/MgCl2 + Al(i-Bu)3 + D in propylene polymerization was studied. An increase of the polymerization temperature above 60°C leads to a decrease in the activity of the titaniummagnesium catalyst (TMC) and in the isotacticity of the polypropylene produced. A preliminary interaction of AlR3 with D at elevated temperatures diminishes the isotacticity of the polymer and has no influence on the activity of TMC. IR spectroscopy was employed to study the influence of the temperature and time of AlR3 interaction with the esters as well as that of the composition of AlR3 (AlEt3 or Al(i-Bu)3) on the process of reduction of these esters. Reduction products such as aldehydes, ketones, and primary alkoxy derivatives of aluminium cannot provide of high stereopecificity of TMC. High stereospecificity is rather thought to be provided by the interaction of active sites with a free ester or tertiary alkoxy derivaties of aluminium. The contribution of each of these processes depends on the catalyst composition and on the polymerization conditions.
Cite:
Sergeev S.A.
, Bukatov G.D.
, Zakharov V.A.
Propylene Polymerization on Titanium-Magnesium Catalysts, 3. Influence of the Products Resulting from the Interaction of Trialkylaluminum with Aromatic Esters on the Activity and Stereospecificity
Makromolekulare Chemie up to 1993, continued as Macromolecular Chemistry and Physics. 1984. V.185. N11. P.2377-2385. DOI: 10.1002/macp.1984.021851115 WOS РИНЦ ANCAN OpenAlex
Propylene Polymerization on Titanium-Magnesium Catalysts, 3. Influence of the Products Resulting from the Interaction of Trialkylaluminum with Aromatic Esters on the Activity and Stereospecificity
Makromolekulare Chemie up to 1993, continued as Macromolecular Chemistry and Physics. 1984. V.185. N11. P.2377-2385. DOI: 10.1002/macp.1984.021851115 WOS РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Feb 20, 1984 |
| Published print: | Nov 1, 1984 |
| Published online: | Mar 12, 2003 |
Identifiers:
| Web of science: | WOS:A1984TV16700015 |
| Elibrary: | 28791301 |
| Chemical Abstracts: | 1985:46327 |
| Chemical Abstracts (print): | 102:46327 |
| OpenAlex: | W1489888748 |