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Title: PEK homo and copolymers via dispersion polymerisation
Author: Smith, Kaylie Jane
ISNI:       0000 0004 6062 4130
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2015
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This thesis is concerned with the development of the Ketonex dispersion process in order to reliably and reproducibly produce PEKK dispersions with controlled properties, together with the modification of pre-existing process parameters to achieve a range of particulate PAEK copolymers. Specific emphasis was placed on industrial considerations, pre-commercial scale-up and addressing potential materials applications. Chapter 1 explores well established methods for the production of PAEKs by both nucleophilic and electrophilic routes. General materials properties are described, and structure-property relationships are discussed. Chapter 2 describes in detail the process parameters associated with the Ketonex dispersion process. Parameters are discussed on a laboratory scale and are related to scale-up, industrial and commercial considerations. Chapter 3 evaluates the production of PEKKs with a range of T:I ratios by the dispersion process. The PEKKs are analysed using a range of techniques and are compared to literature data for process evaluation. Chapter 4 discusses the theory behind the action of the benzoic acid dispersant used in the dispersion process, which results in the production of fine particulate PEKK. A hypothesis involving the nucleation of polymerisation by aluminium benzoate is proposed. Chapter 5 demonstrates how the dispersion process can be modified to produce a range of PAEK copolymers. The incorporation of imide and sulfone co-monomers are evaluated in detail, while a selection of alternative monomers undergo preliminary evaluation. Chapter 6 addresses an epoxy toughening application. Amine end-capped PAEKs are produced by the dispersion process by in situ functionalisation. A protected end-capper is devised, its attachment and deprotection confirmed through a model compound approach and is successfully applied to the polymerisation system.
Supervisor: Moloney, Mark ; Towie, Ian Sponsor: Royal Commission for the Exhibition of 1851
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available