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Title: Synthesis of controlled-structure methacrylic copolymers via aqueous RAFT polymerisation
Author: Jesson, Craig
ISNI:       0000 0004 8499 0119
Awarding Body: University of Sheffield
Current Institution: University of Sheffield
Date of Award: 2019
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In recent years, the use of polymers in modern society has become ubiquitous. With ever increasing applications, polymer science has had to adapt and evolve to meet a wide range of complex requirements. It was less than 100 years ago when Staudinger first proposed that polymers were long-chain molecules made up of covalently-bound building blocks or repeat units called monomers. When this revolutionary and controversial concept was finally established in 1929, Carothers proposed that there were two categories of synthetic polymers: 'addition' polymers and 'condensation' polymers. While the repeat unit of an 'addition' polymer is identical to that of the monomer being polymerised, 'condensation' polymers are typically formed via elimination of a small molecule such as water, with one such side-product being eliminated for every repeat unit linkage. This initial classification system worked well for the majority of polymers but over time it became apparent that there were some obvious exceptions, such as polyurethanes. In 1953, this system was updated by Flory, who proposed that polymers should be classified as either 'step' or 'chain' depending on their reaction mechanisms. Step-growth polymers involve the gradual build-up of long-chain polymers via dimers, trimers, oligomers etc., whereas the formation of chain-growth polymers proceeds by sequential addition of a single (monomer) unit. The latter mechanism is used for the polymerisation of vinyl monomers, as discussed in this thesis.
Supervisor: Armes, S. P. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available