SMALL-ANGLE X-RAY-SCATTERING STUDY ON THE INTERFACE IN BLOCK-COPOLYMERS WITH FRACTAL PROPERTIES

The interface thickness in two triblock copolymers were determined usi ng small-angle x-ray scattering in the context of the theory proposed by Ruland. The thickness was found to be nonexistent for the samples a t three different temperatures. By viewing the systems as ideal two-ph ase systems with a sharp boundary, the roughness of the interface was described by fractal dimension D(s) which slightly increased with temp erature. Length scales in which surface fractals are proved to be corr ect exist for each sample at every temperature, and become wider as th e temperature increases. The interface in block copolymers was treated as fractal, which reasonably explained the differences between Porod' s law and experimental data, and gained an insight into the interactio n between different segments on the interface.