“…It has been established, especially by electron microscopy, small-angle X-ray scattering, and X-ray diffraction, that segregated microphases can be spheres, cylinders, or lamellae. The type of morphology adopted by 602 ISHIZU the copolymer essentially depends on its composition [6]. The morphological changes on AB block copolymer will be observed also by changing the selectivity of the casting solvent for the A component in solution-cast films or in ordered solutions [7-91, simply because selectivity changes the ratio between the effective radii or gyration of A-and B-block chains.…”