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A ToF-SIMS investigation of a buried polymer/polymer interface exposed by ultra-low-angle microtomy

Hinder, SJ, Lowe, C, Maxted, JT and Watts, JF (2004) A ToF-SIMS investigation of a buried polymer/polymer interface exposed by ultra-low-angle microtomy SURFACE AND INTERFACE ANALYSIS, 36 (12). 1575 - 1581. ISSN 0142-2421

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Abstract

The interfacial region of a model, multilayer coating system on an aluminium substrate has been investigated by high resolution time-of-flight secondary ion mass spectrometry (ToF-SIMS). Employing ultra-low-angle microtomy (ULAM), the interface between a poly(vinylidene difluoride) (PVdF) based topcoat and a poly(urethane) (PU) based primer ‘buried’ over 20μm below the PVdF topcoat’s air/coating surface was exposed. Imaging ToF-SIMS and subsequent post-processing extraction of mass spectra of the ULAM exposed interface region and the PVdF topcoat and PU primer bulks indicates that the material composition of the polymer-polymer interface region is substantially different to that of the bulk PVdF and PU coatings. Analysis of the negative ion mass spectra obtained from the PVdF/PU interface reveals the presence of a methacrylate based component or additive at the interface region. Reviewing the topcoat and primer coating formulations reveals the PVdF topcoat formulation contains methyl methacrylate (MMA)/ethyl acrylate (EA) acrylic co-polymer components. Negative ion ToF-SIMS analysis of an acrylic co-polymer confirms it is these components that are observed at the PVdF/PU interface. Post-processing extraction of ToF-SIMS images based on the major ions of the MMA/EA co-polymers reveals these components are observed in high concentration at the extremities of the PVdF coating i.e. at the polymer-polymer interface but are also observed to be distributed evenly throughout the bulk of the PVdF topcoat. These findings confirms that a fraction of the MMA/EA acrylic co-polymers in the formulation segregate to the topcoat-primer interface where they enhance the adhesive properties exhibited by the PVdF topcoat towards the underlying PU primer substrate.

Item Type: Article
Additional Information: This is the accepted version of the following article: Hinder SJ, Lowe C, Maxted JT, Watts JF (2004) A ToF-SIMS investigation of a buried polymer/polymer interface exposed by ultra-low-angle microtomy. SURFACE AND INTERFACE ANALYSIS 36(12):1575-1581, which has been published in final form at http://dx.doi.org/10.1002/sia.1985
Uncontrolled Keywords: Science & Technology, Physical Sciences, Chemistry, Physical, Chemistry, time-of-flight secondary ion mass spectrometry, buried interface, ultra-low-angle microtomy, multilayer coatings, imaging SIMS, HIGH-RESOLUTION XPS, CROSS-LINKING, SPECTROSCOPY, SEGREGATION, COATINGS, RESINS, FORMULATION, SYSTEMS, FILMS
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Divisions: Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Depositing User: Symplectic Elements
Date Deposited: 16 Nov 2012 11:39
Last Modified: 19 Nov 2014 02:33
URI: http://epubs.surrey.ac.uk/id/eprint/738080

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