Defect formation in thin polyelectrolyte films on polycrystalline NiTi substrates

Journal of the Mechanical Behavior of Biomedical Materials
J LackmannH J Maier

Abstract

This paper reports on the mechanical properties of ultrathin PAA/PAH (polyacrylic acid/polyallylamine hydrochloride) polyelectrolyte films deposited by a layer-by-layer technique on a polycrystalline Nickel-Titanium (NiTi) substrate. Since thin polyelectrolyte films are potentially suitable coatings to reduce the Ni release in biomedical applications, the mechanical properties of the thin films were determined by applying monotonic and cyclic tensile strains of 5% and 3%, respectively. While single tensile strains up to 5% revealed the amazing strain to failure of the applied coating, cyclic strains resulted in defect formation within the polyelectrolytes. To provide a better understanding of the mechanisms that are determining the defect formation, macroscopic and microscopic defect localizations were determined by digital image correlation-and EBSD (electron back-scattered diffraction)-techniques. Defects emerged particularly within areas of elevated local strain differences and were predominantly observed in the vicinity of grain boundaries. To relate these findings to the transformation behavior of polycrystalline NiTi considering strain localizations and intergranular constraints, crystallographic data obtained from the EB...Continue Reading

References

Jul 13, 2002·Journal of Biomedical Materials Research·O CisséL'H Yahia
Oct 23, 2002·European Journal of Vascular and Endovascular Surgery : the Official Journal of the European Society for Vascular Surgery·G RiepeH Imig
Jan 8, 2003·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·M AssadC H Rivard
Sep 5, 2003·European Radiology·Dieter StoeckelTom Duerig
Nov 19, 2003·Journal of Biomedical Materials Research. Part a·W M Carroll, M J Kelly
Jun 7, 2006·Minimally Invasive Therapy & Allied Technologies : MITAT : Official Journal of the Society for Minimally Invasive Therapy
Jul 21, 2006·The Journal of Physical Chemistry. B·Karen KöhlerGleb B Sukhorukov
Apr 28, 2007·Small·Dmitry G Shchukin, Helmuth Möhwald
Jun 21, 2008·Acta Biomaterialia·Wojciech ChrzanowskiJonathan Campbell Knowles
Nov 11, 2008·Biomaterials·Svetlana A ShabalovskayaJan Van Humbeeck

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Citations

May 9, 2015·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Viviana R Guiza-ArguelloMariah S Hahn

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