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Zirconium-catalyzed polymerization of a styrene : catalyst reactivation mechanisms using alkenes and dihydrogen
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Theaker, Giles W., Morton, Colin and Scott, Peter (2011) Zirconium-catalyzed polymerization of a styrene : catalyst reactivation mechanisms using alkenes and dihydrogen. Macromolecules, Vol.44 (No.6). pp. 1393-1404. doi:10.1021/ma102835p ISSN 0024-9297 .
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Official URL: http://dx.doi.org/10.1021/ma102835p
Abstract
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 | ||||
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Subjects: | Q Science > QD Chemistry T Technology > TP Chemical technology |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Library of Congress Subject Headings (LCSH): | Polymerization, Zirconium, Catalysis, Styrene, Polystyrene, Alkenes | ||||
Journal or Publication Title: | Macromolecules | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 0024-9297 | ||||
Official Date: | 22 March 2011 | ||||
Dates: |
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Volume: | Vol.44 | ||||
Number: | No.6 | ||||
Page Range: | pp. 1393-1404 | ||||
DOI: | 10.1021/ma102835p | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Funder: | European Regional Development Fund (ERDF) , Engineering and Physical Sciences Research Council (EPSRC) |
Data sourced from Thomson Reuters' Web of Knowledge
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