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.Keywords: Block copolymer, graft copolymer, SAXS, SANSPACS: 61.05.cf, 61.05.fg, 61.41.+e. H. HasegawaDepartment of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 615-8510, Japan
