STUDIES ON THE INTERFACES OF MICROPHASE-SEPARATED STRUCTURES OF BLOCK-COPOLYMERS BY NEUTRON REFLECTIVITY

Segment distributions in lamellar microphase-separated structures of t hree partially deuterium-labeled poly(styrene-b-2-vinylpyridine)s were investigated by neutron reflectivity measurement. By fitting the calc ulated reflectivity profiles to the experimental one, it was clarified that the lamellar microdomains preferentially oriented parallel to th e film surface and that the thickness of the lamellar interface was ab out 35 Angstrom. Also, it was found that the segments in the vicinity of the chemical junction points between two blocks were localized stro ngly near the lamellar interface, while the segments on the free ends were localized at the center of the lamellar microdomains with fairly wide distribution.