| 초록 |
The orientation of lamellar microdomains and phase transition for the thin films of a symmetric polystyrene-b-poly(methyl methacrylate) (PS-b-PMMA) on random copolymer-grafted substrates were investigated by transmission electron microscopy (TEM) and grazing incidence small-angle x-ray scattering (GISAXS). The styrene mole fraction (XS) in random copolymers of P(S-r-MMA) was controlled to tune the interfacial interactions at the substrates from PS-selective to PMMA-selective. Except in the case of a neutral substrate with XS = 0.55, all the same parallel orientations of lamellar microdomains were observed in the TEM images. The ODT evaluation, a new approach to evaluating the interfacial interactions at substrates, confirms a neutral substrate that induces surface compatibility between the PS and PMMA blocks at the substrate. |
