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Fabrication and characterisation of self-healing polymers and nacre-like films for coatings
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Smith, Andrew James (2020) Fabrication and characterisation of self-healing polymers and nacre-like films for coatings. PhD thesis, University of Warwick.
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Official URL: http://webcat.warwick.ac.uk/record=b3684850
Abstract
Damage and wear of coatings represent a significant concern for both manufacturers and consumers in the automotive sector. As a result, it is critical to develop technologies that prolong the lifetime of these coatings, fundamentally increasing cosmetic longevity and customer satisfaction. This project explores two approaches to this problem that offer different mechanisms towards the ultimate goal of anti-wear coatings.
Firstly, substituting PMMA, currently used in automotive coatings, with self-healing analogues, would allow wear to be reversed by recovering the virgin material's mechanical and cosmetic properties. In this work, MMA monomers were successfully functionalised using a thermally reversible Diels-Alder coupling reaction. RAFT and Cu(0)-mediated LRP is used to control the molecular weight of the functional PMMA. Low dispersity functionalised polymers are reported that have potential for self-healing properties.
Second, this project explores the manufacture of nacre-mimetic films, with functionalised nanoplatelet and polymer components, to increase interfacial interactions. A GO-wsPU structure was produced and cross-linked via UV. Achieving homogeneous films proved challenging due to the micellar nature of the wsPU in that it did not readily disperse and distribute between GO layers. Equally, GO, and PVA is functionalised with UPy to encourage a strong hydrogen bonding network. Multiple characterisation techniques confirm the successful functionalisation of both components. Novel, uni-directional layered films are produced, and significant increases in E (392%), σ (535%), ε (598%), and UT (1789%) were recorded.
Finally, innovative nacre-like films were produced containing α-ZrP and a PEA to produce the first freestanding nacre-mimetic films of their kind. Films with high PEA content are transparent. Static tensile testing yields 341%, 572%, 707% and 3981% increases to E, σ, ε and UT, respectively, and nanoindentation measurements confirm a 200- and 44-fold increase in Er and H when compared to the lowest PEA content film.
Item Type: | Thesis (PhD) | ||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) T Technology > TL Motor vehicles. Aeronautics. Astronautics |
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Library of Congress Subject Headings (LCSH): | Coatings, Protective coatings, Self-healing materials, Automobiles -- Corrosion, Polymers -- Industrial applications | ||||
Official Date: | December 2020 | ||||
Dates: |
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Institution: | University of Warwick | ||||
Theses Department: | Warwick Manufacturing Group | ||||
Thesis Type: | PhD | ||||
Publication Status: | Unpublished | ||||
Supervisor(s)/Advisor: | McNally, Tony ; Wan, Chaoying ; Figiel, Łukasz | ||||
Format of File: | |||||
Extent: | [7 unnumbered], xxi, 222 leaves : illustrations | ||||
Language: | eng |
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