Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342560
Title: The synthesis and use of cobalt complexes in catalytic chain transfer polymerisation
Author: Waterson, Jennifer Louise
ISNI:       0000 0001 3563 9240
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 2000
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Abstract:
Work in this thesis examines the structural properties of various catalytic chain transfer agents (CCTA’s) and their effect and implications on catalytic chain transfer polymerisation (CCTP). CCTP is an effective polymerisation technique for producing low molecular weight methacrylate and styrene polymers that contain terminal vinyl functionalities. CCTP has also been shown to be effective in both emulsion and bulk polymerisation techniques using catalytic quantities of the CCTA. The products of CCTP (macromonomers) can also be used to produce copolymers. The work contained here has examined the effect of increasing equatorial carbons in low spin cobalt (II) complexes, whilst both the effects of equatorial and axial ligands has been examined for cobalt (III) analogues in both MMA and Styrene bulk polymerisations. Results have shown that the activity (Cs values) for cobalt (II) complexes is affected by varying the equatorial carbons, increasing the number of carbons leads to a decrease in C5. Cobalt (III) complexes have shown that a strong axial base ligand (pyridine) combined with increased equatorial carbons leads to a further decrease in catalytic activity whilst the introduction of a weak base (water), combined with increased equatorial carbons increases activity when compared to the pyridine analogues. It has been shown that it is possible to control the partitioning properties of these complexes by varying the equatorial and/or axial ligands. Results indicate that the complexes would depending on their partitioning results be effective to a lesser or greater degree in emulsion polymerisation.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.342560  DOI: Not available
Keywords: QD Chemistry
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