| 초록 |
We suggest the role of non-functional random and block copolymer chains as physically adsorbed neutral layers for lamellar orientation via transition behavior of polystyrene-b-poly(2-vinylpyridine) (PS-b-P2VP) films. For lamellar orientation, population of perpendicular lamellae in PS-b-P2VP film increases as adsorbed-layer thicknesses (had) of P(S-r-2VP) increases to 4.0 nm due to the corresponding increase in the surface neutrality toward BCP films. On the other hand, an extremely thin (1.7 nm) adsorbed layer consisting of LMW PS-b-P2VP offer enough surface neutrality and further increase in had up to 4.0 nm rather decrease the surface neutrality. Interestingly, the order-to-disorder transition temperature in LMW PS-b-P2VP films further exhibit the consistent had dependency, implying that the physically adsorbed layers prepared from the copolymers feasibly provide surface neutrality toward PS-b-P2VP films. |
