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Novel chromium compounds and their use in the polymerisation of methyl methacrylate
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Stump, Mark Andrew (1998) Novel chromium compounds and their use in the polymerisation of methyl methacrylate. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b1361599~S1
Abstract
The controlled polymerisation of methacrylates has been extensively studied in recent years. The discovery of group transfer polymerisation (GTP) by DuPont initiated many investigations into this area, one of the main objectives was a commercially viable process giving access to the wealth of novel polymer architecture and properties afforded by controlled synthesis.
This work has investigated a number of chromium compounds and their use in the polymerisation of methyl methacrylate using a variety of agents, under various reaction conditions. In this work new chromium compounds have been prepared and existing compounds investigated further in an attempt to gain control over the polymer reaction, in particular the molecular weight, Mn, of the polymer formed.
An unusual chromium - zinc metal compound has been prepared, and used in the polymerisation of MMA, however, this resulted in only low % conversion of monomer. Further work resulted in the preparation of chromium - Schiff base organometallic compounds. These compounds were extensively studied and resulted in the quantitative conversion of MMA over a 3 hour period, under certain conditions.
Other compounds examined included aqueous organochromium complexes, which were stable in aqueous media for several days at low temperatures, these compounds were also used to polymerise MMA, low % conversion was again achieved. It was found that although all these compounds resulted in the polymerisation of MMA, by various mechanisms, control over Mn had not been achieved.
Item Type: | Thesis (PhD) | ||||
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Subjects: | Q Science > QD Chemistry | ||||
Library of Congress Subject Headings (LCSH): | Chromium compounds, Polymerization, Methyl methacrylate | ||||
Official Date: | January 1998 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Department of Chemistry | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | Haddleton, David M. | ||||
Sponsors: | Imperial Chemical Industries, ltd. | ||||
Format of File: | |||||
Extent: | 225 pages : illustrations | ||||
Language: | eng |
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