Nylon 66 injection-moulded insulators are used by British Rail
outdoors for track insulation. It has been suspected that the
conditions of initial moulding and treatment before use represent a
significant factor affecting properties over a period of time in this
application. A laboratory study has already been reported on the
influence of spherulite size on mechanical properties, using a
nucleated grade of Nylon 66 to compare with typical unnucleated
polymer, but this work throws little light on the problem of
unnucleated polymer as such or on the influence of injection conditions
and the effects of moisture present after moulding. It was therefore decided to investigate these aspects using a standard
unnucleated grade of Nylon 66....
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.