Zirconium-catalyzed polymerization of a styrene : catalyst reactivation mechanisms using alkenes and dihydrogen
Theaker, Giles W., Morton, Colin and Scott, Peter, 1965 Dec. 10-. (2011) Zirconium-catalyzed polymerization of a styrene : catalyst reactivation mechanisms using alkenes and dihydrogen. Macromolecules, Vol.44 (No.6). pp. 1393-1404. ISSN 0024-9297Full text not available from this repository.
Official URL: http://dx.doi.org/10.1021/ma102835p
Zirconium salicylaldiminates in the presence of AliBu3/[Ph3C][B(C6F5)4] are inactive for the homopolymerization of p-tert-butylstyrene (TBS), but the addition of hexene leads to a highly active system. Analysis of the polymers by NMR and MALDI indicates surprisingly that most of the product chains contain no hexene, while some contain a single hexene unit. Addition of dihydrogen also leads to the production of poly(TBS) without substantial reduction in molecular weight and with main-chain end-group unsaturation. These and other observations lead us to two related mechanisms for the hexene- and dihydrogen-promoted reactions. Synthetic and catalytic studies indicate that the active species is not a typical bis(salicylaldiminato) compound but an amido/alkoxido system. An authentic compound of this class is highly active for the TBS polymerization even in the absence of added aluminum alkyl.
|Item Type:||Journal Article|
|Subjects:||Q Science > QD Chemistry
T Technology > TP Chemical technology
|Divisions:||Faculty of Science > Chemistry|
|Library of Congress Subject Headings (LCSH):||Polymerization, Zirconium, Catalysis, Styrene, Polystyrene, Alkenes|
|Journal or Publication Title:||Macromolecules|
|Publisher:||American Chemical Society|
|Date:||22 March 2011|
|Page Range:||pp. 1393-1404|
|Funder:||European Regional Development Fund (ERDF) , Engineering and Physical Sciences Research Council (EPSRC)|
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