Abstract
Most modern extruded high voltage cables employ cross-linked polyethylene (XLPE) as the insulation material. XLPE has excellent thermo-mechanical properties, is relatively cheap and has a low dielectric loss, which make it an ideal material for this application. Unfortunately, XLPE is not easily recycled at the end of its lifetime leading to questions concerning its long-term sustainability. A previous investigation in this series considered the potential of a range of ethylene-based systems to provide suitable recyclable alternatives to XLPE. Whilst blending could allow systems having similar thermo-mechanical and electrical properties to XLPE to be designed, it was not possible to obtain better performance than XLPE using these systems. Polypropylene offers, potentially, a route to improved insulation systems by virtue of its higher melting point and excellent dielectric properties. However, traditional isotactic polypropylenes have always had the problem of being too brittle for inclusion into practical cable designs. Recently a broad range of propylene co-polymers having improved ductility have become available, which may prove more suitable. The current study compares traditional isotactic and syndiotactic polypropylenes to a range of commercially available propylene co-polymers and focuses on their morphology, thermal, thermo-mechanical and electrical properties. These parameters were then taken together to identify the most suitable candidate materials for future cable applications. The use of blending as a means to further optimise the various material properties was also explored.
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Acknowledgements
The GPC analysis on all the materials was kindly carried out by Smithers Rapra using their Polymer Laboratories GPC220. We would like to thank Mr Luca Cozzarini of the DMRN, University of Trieste, Italy, for kindly carrying out the wide angle X-ray scattering. The work is funded through the EPSRC Supergen V, UK Energy Infrastructure (AMPerES) grant in collaboration with UK electricity network operators working under Ofgem’s Innovation Funding Incentive scheme; full details can be found on http://www.supergen-amperes.org.
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Hosier, I.L., Vaughan, A.S. & Swingler, S.G. An investigation of the potential of polypropylene and its blends for use in recyclable high voltage cable insulation systems. J Mater Sci 46, 4058–4070 (2011). https://doi.org/10.1007/s10853-011-5335-9
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DOI: https://doi.org/10.1007/s10853-011-5335-9