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    Isopropyl myristate modified silicone as a potential new encapsulating material for implantable devices

    Year: 2010

    Journal: Journal of Applied Polymer Science, Volume 119, Issue 5, pages 2917–2924, 5 March 2011, 20111221

    Authors: Jaroslaw M. Wasikiewicz1, Deepen Paul1, Nima Roohpour1, Jaina Vaghela1, Michael F. Grahn2, Pankaj Vadgama1

    Organizations: 1 Interdisciplinary Research Centre in Biomedical Materials, Queen Mary University of London, Mile End Road, London E1 4NS, United Kingdom, 2 Centre for Academic Surgery, Institute of Cell and Molecular Science at Barts and London School of Medicine and Dentistry, 4 Newark Street, London E1 2AT, United Kingdom

    A new modified silicone was obtained by the physical entrapment of a hydrophobic lipid, isopropyl myristate (IPM), to improve the encapsulation properties and corrosion resistance of medical electronic implants. Differences between the water transport for films in contact with water vapor versus those in contact with liquid water were identified; they showed increased permeability to water vapor, which was possibly the result of differences in the water organization at the hydrophobic film interface. Improvements, including enhanced scratch resistance and adhesion, in the mechanical properties of the modified material was also achieved. The incorporation of IPM further resulted in a significant improvement in the cell biocompatibility compared with the unmodified polymer; this suggested that the IPM combination could be a viable basis for implant device packaging.