This proposal is part of a major research programme at Reading which is focused on nano-fibres prepared by electrospinning. The programme is centered on the spinning conditions/structure/property relationships in polymer based nanofibres. We seek time to obtain high quality small-angle neutron scattering data to facilitate the quantitative determination of the structure of polymer fibres prepared from single phase solutions and those which contain a significant degree of microphase separation typical of many polymer mixtures. We wish to explore the possibilities afforded by the preparation of nanoscale fibres by electrospinning, on the polymer phase separation and on the control the microstructure of the resultant fibres. In otherwords, how the rapid transfer from concentrated solution to solid is affected by the potential for phase separation.