CARLETTO, ANDREA (2019) In Situ Mass Spectrometry of Polymerising Pulsed Plasmas. Doctoral thesis, Durham University.
|PDF (Andrea Carletto - PhD Thesis - In Situ Mass Spectrometry of Polymerising Pulsed Plasmas) - Accepted Version|
Pulsed plasma polymerisation provides an efficient method for the functionalisation of solid surfaces. In comparison to continuous wave plasma conditions, it causes limited monomer fragmentation and leads to high levels of structural retention. Diagnostic studies on such systems have become increasingly common establishing plasma diagnostic techniques as a powerful tool to garner a deeper understanding of the chemistry on which these pulsed plasma deposition processes rely on. In this work, in situ time-resolved mass spectrometry was employed, operating in both ion and radical species detection mode, to explore the complex nature of the chemical reactions occurring in the plasma phase. The intent of this project is gain insight into reaction pathways of pulsed plasmas, and draw comparisons between conventional step-growth polymerisation (monomer-monomer addition) and pulsed plasma polymerisation routes. Common monomer precursors were investigated under pulsed plasma conditions, namely; 1-decene, allyl glycidyl ether (AGE), hexafluoropropylene oxide (HFPO), glycidyl methacrylate (GMA), maleic anhydride (MAH) and butyl acrylate (BA). The experimental results confirm that step-growth polymerisation occurs in the plasma phase, via two distinct plasma environments as identified by time-resolved mass spectrometry. Importantly, pulsing electric discharges is demonstrated to limit the monomer fragmentation so that the chemical features of the original monomer precursor remain intact leading to structurally well-defined plasma polymers. Such findings corroborate the results obtained from the characterisation of resulting plasma polymer films that can be found in the literature.
|Item Type:||Thesis (Doctoral)|
|Award:||Doctor of Philosophy|
|Keywords:||Physical Chemistry, Surface Science, Surface Chemistry, Plasma Chemistry, Plasma Polymerisation, Plasma Diagnostics, Pulsed Plasma, Mass Spectrometry, Plasma Mass Speectrometry, In Situ Mass Spectrometry.|
|Faculty and Department:||Faculty of Science > Chemistry, Department of|
|Copyright:||Copyright of this thesis is held by the author|
|Deposited On:||13 Dec 2019 10:12|