Light, X-ray, and Neutron Scattering Roland et al. (1984) used both SAxs and SANS in conjunction with TEM to assess the size of butadiene domains(5% by weight) in a CR matrix.Roland et al used different master batches containing deuterated and protonated butadiene, respectively. These were each blended on a two-roll mill to study the coalescence of the polybutadiene phase. Coalescence(measured by SANS) was minimized by low temperature mixing, or by significantly increasing the molecular weight of the disperse or continuous phase to create a greater disparity in viscosity Some preliminary SANS work on IR blended with deuterated 1,2-BR has been reported(Trask and Roland, 1989; Roland et al., 1984). All scattering techniques are affected by the presence of fillers, which lead to more extensive scattering