Waterson, Jennifer Louise (2000) The synthesis and use of cobalt complexes in catalytic chain transfer polymerisation. PhD thesis, University of Warwick.

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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.

Item Type:	Thesis or Dissertation (PhD)
Subjects:	Q Science > QD Chemistry
Library of Congress Subject Headings (LCSH):	Cobalt compounds -- Synthesis, Polymerization, Styrene, Ligands
Official Date:	2000
Dates:	Date Event 2000 UNSPECIFIED
Institution:	University of Warwick
Theses Department:	Department of Chemistry
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Haddleton, David M. ; Richards, S. N.
Extent:	xxiv, 232 leaves : illustrations
Language:	eng

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