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Estimation of the strength of adhesion between a thermoresponsive polymer coating and nitinol wire

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Abstract

As polymer coatings become more widely used in the biomedical device industry, both to improve biocompatibility and as coatings for localised drug delivery, quantitative methods to measure the adhesive strength between coatings and substrates become a very important consideration. The aim of this study was to take a method for estimating the interfacial fracture toughness of a film to a flat substrate and apply it to Nitinol wires used in the production of medical devices. An investigation into the affect of surface roughness on the fracture toughness was also conducted. For the present study, a thermoresponsive based Poly (N-isopropylacrylamide) polymer was coated onto nitinol wire substrates and the adhesion strength between the polymer and wire was measured using a nanoindentation technique. Different surface treated nitinol wires, with different surface topography and roughness were used, and the affect of these surface properties on adhesion strength was investigated. Results showed that it was possible to apply the delamination technique to wire samples and obtain fracture toughness values. Results also showed that the surface roughness is an important parameter that can affect the adhesion between a coating and the substrate. It was found that, as the average surface roughness increased so also did the adhesive strength between the coating and wire sample.

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Acknowledgements

Financial support for this study was provided by the Research Council for Science, Engineering and Technology (IRCSET): funded by the national development plan.

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Authors and Affiliations

  1. National Centre for Biomedical Engineering Science, National University of Ireland, Galway, Ireland

    Martin Burke, Brenda Clarke, Yuri Rochev & William Carroll

  2. Department of Chemistry, University College Dublin, Dublin, Ireland

    Alexandar Gorelov

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  1. Martin Burke
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  2. Brenda Clarke
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  3. Yuri Rochev
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  4. Alexandar Gorelov
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  5. William Carroll
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Correspondence to Martin Burke.

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Burke, M., Clarke, B., Rochev, Y. et al. Estimation of the strength of adhesion between a thermoresponsive polymer coating and nitinol wire. J Mater Sci: Mater Med 19, 1971–1979 (2008). https://doi.org/10.1007/s10856-007-3274-4

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  • DOI: https://doi.org/10.1007/s10856-007-3274-4

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