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Title: Click chemistry : a route to isocyanate-free polyurethane coatings
Author: Cullen, John Edward
ISNI:       0000 0004 5361 4030
Awarding Body: University of Strathclyde
Current Institution: University of Strathclyde
Date of Award: 2014
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The preparation of a polyurethane liquid-applied membrane (LAM) coating system, which requires no isocyanate in the curing process, has been achieved. The synthesis of both azide- and alkyne-functional molecules affords the necessary building blocks to prepare both azide- and alkyne-functional polyurethanes. The combination of the copper catalysed azide alkyne cycloaddition (CuAAC) reaction and azide/alkyne-functional polyurethanes allows for the creation of LAM systems, which can be prepared at ambient temperature and which do not have the disadvantages normally associated with traditional isocyanate-cured systems. In the first instance, the PhD program was concerned with the preparation of azide/alkyne-functional molecules. Particular interest was given to the synthesis of azides and alkynes that contained alcohol or amine functionality. The subsequent azide/alkyne-functional amines and alcohols allow for their insertion into the preparation of polyurethane-based prepolymers. Another aspect of the work was focused on various copper catalyst systems and their role in the preparation of LAM systems. A suitable catalyst system was found and applied to the curing of azide/alkyne-functional materials to provide a LAM system. The formulation of the non-isocyanate resins into LAM-type systems was attempted. Key performance criteria for the non-isocyanate systems, such as physical properties and the UV and light-stability of the formulated LAM, were measured alongside standard isocyanate-cured systems. The necessary components for a truly non-isocyanate LAM system have been set in place. The improvement of the physical properties of the CuAAC crosslinked LAM systems will be extended in the future. The knowledge gained within this study has generated useful information which will potentially accelerate the transfer of CuAAC chemistry to a number of other technological areas, such as sealants and adhesives.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral