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    Microinjection moulded polyetheretherketone biomaterials as spinal implants: physico-chemical and mechanical characterisation

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    Publication date
    2019-03
    Author
    Tuinea-Bobe, Cristina-Luminita
    Xia, H.
    Ryabenkova, Yulia
    Sweeney, John
    Coates, Philip D.
    Fei, G.
    Keyword
    Polyetheretherketone (PEEK)
    Thermoplastic polymer
    Microinjection moulding
    Spinal implants
    Rights
    This is an author-created, un-copyedited version of an article accepted for published in Materials Research Express. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/2053-1591/aaf5eb.
    Peer-Reviewed
    Yes
    
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    Abstract
    Polyetheretherketone (or PEEK) is a thermoplastic polymer known for its high plasticity and toughness and has been widely employed as a material for a variety of load-bearing medical devices ranging from trauma implants to interspinal spacers and femoral stems. While being inherently chemically inert and therefore biocompatible and having very short lived post-radiation free radicals, PEEK presents different mechanical properties depending on its degree of crystallinity. It can be processed via extrusion, injection or compression moulding. However, these techniques do not allow high precision control over the fine morphological structure that strongly influences mechanical properties. Microinjection moulding, in contrast, makes it possible to produce fine details of medical implants with high precision and accuracy. Another advantage of this method is the controlled production of the material with heterogeneous structure due to variations in crystallinity. Having stiffness in the middle of the sample different from that at the edges enables a structure that mimics the bone/cartilage parts of an implant. This paper reports on the manufacturing of PEEK components by microinjection moulding, and their characterisation by physico-chemical (XRD, SAXS, TEM, FTIR, POM) and mechanical (tensile testing) means, in order to assess the suitability of use for biomedical application, such as spinal implants. We discuss the influence of such parameters as mould temperatures, injection speeds and hold pressures on the crystallinity and mechanical properties of the material.
    URI
    http://hdl.handle.net/10454/16702
    Version
    Accepted Manuscript
    Citation
    Tuinea-Bobe C-L, Xia H, Ryabenkova Y et al (2019) Microinjection moulded polyetheretherketone biomaterials as spinal implants: physico-chemical and mechanical characterisation. Materials Research Express. 6(3): 035311.
    Link to publisher’s version
    https://doi.org/10.1088/2053-1591/aaf5eb
    Type
    Article
    Collections
    Engineering and Informatics Publications

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