Small-angle neutron scattering (SANS) and small-angle X-ray scattering (SAXS) are excellent techniques tostudy nano-scale concentration fluctuations in the two-component polymer systems such as block and graft copolymersand polymer blends. The miscibility, phase transitions, microphase-separated structures and interface thicknesses wereinvestigated by SANS and SAXS for the block and graft copolymers, which at least contain natural or synthetic rubberas one component.H. Hasegawa Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
