This proposal requests time on NIMROD at ISIS to enable the characterisation of polymer nanocomposite interfaces. This information will be used as part of a wider effort for which EPSRC funding is being sought. However the ISIS proposal also stands in its own right and can be achieved with or without EPSRC funding. Our hypothesis is that the insulating properties of nanocomposite materials are controlled by the nanoparticle/polymer interface. Once the interfaces are characterised the electrical properties of the nanocomposites can be related back to the interfacial properties through calculations of the density of excess electron states and corresponding mobilities. We propose to combine neutron and x ray scattering data, which will be crucial for the determination of the contribution of surface trapping states to insulator performance.