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ToF-SIMS depth profiling of a complex polymeric coating employing a C-60 sputter source

Hinder, SJ, Lowe, C and Watts, JF (2007) ToF-SIMS depth profiling of a complex polymeric coating employing a C-60 sputter source SURFACE AND INTERFACE ANALYSIS, 39 (6). 467 - 475. ISSN 0142-2421

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A complex poly(vinylidene difluoride) (PVdF)/poly(methyl methacrylate) (PMMA) based coil coating formulation has been investigated using time-of-flight SIMS (ToF-SIMS). Employing a Bi3+ analysis source and a Buckminsterfullerene (C60) sputter source, depth profiles were obtained through the polymeric materials in the outer few nanometres of the PVdF topcoat. These investigations demonstrate that the PVdF coating’s air/coating interface is composed principally of the flow agent included in the formulation. Elemental depth profiles obtained in the negative ion mode demonstrate variation in the carbon, oxygen and fluorine concentrations within the coating with respect to depth. All 3 elemental depth profiles suggest that the PVdF coating bulk possesses a constant material composition. The oxygen depth profile reveals the presence of a very thin oxygen rich sub-surface layer in the PVdF coating, observed within the first second of the sputter/etch profile. Retrospectively extracted mass spectra (from the elemental depth profile raw data set) of the PVdF coating sub-surface and bulk layers indicates this oxygen rich sub-surface layer results from segregation of the acrylic co-polymers in the formulation towards the PVdF coating air/coating interface. Molecular depth profiles obtained in both the positive and negative secondary ion modes provide supporting evidence to that of the elemental depth profiles. The molecular depth profiles confirm the presence of a sub-surface layer rich in the acrylic co-polymers indicating segregation of the co-polymers towards the PVdF topcoats air-coating surface. The molecular depth profiles also confirm that the PVdF component of the topcoat is distributed throughout the coating but is present at a lower concentration at the air-coating interface and in the sub-surface regions of the coating, than in the coating bulk.

Item Type: Article
Additional Information: The definitive version is available at;jsessionid=7A6C601B232E98505B306017C5EF848A.d04t02
Uncontrolled Keywords: Science & Technology, Physical Sciences, Chemistry, Physical, Chemistry, time-of-flight secondary ion mass spectrometry, depth profiling, C-60, coil coatings, polymer, ION MASS-SPECTROMETRY, HIGH-RESOLUTION XPS, BUCKMINSTERFULLERENE PROBE, ORGANIC MATERIALS, STATIC SIMS, FILMS, BOMBARDMENT, PROJECTILES, BEAM, AG
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Divisions: Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Depositing User: Symplectic Elements
Date Deposited: 16 Nov 2012 09:35
Last Modified: 23 Sep 2013 19:52

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