Poly(ethylene)s carrying multiple end-functional groups on a single chain end have been prepared from polybutadiene, saturated with either hydrogen or deuterium. These materials are strongly surface active and are fascinating model systems for the influence of crystallinity on surface modification in blends. In an earlier QENS experiment we established that (contrary to the bulk diffusion) local dynamics are generally slightly faster for functionalized polymers in blends than their unfunctionalised polymers. This proposal seeks time on IRIS to extend this work, resolve the influence of the matrix from that of the functional groups and to determine the influence of microstructure on the dynamics of these blends.