| 초록 |
Constraints imposed by nanometer-scale confinement with diameters corresponding to the length equivalent to several multiples of block copolymer (BCP) chain size have been employed to investigate the influence of two-dimensional confinement on the behavior of BCPs. In the present study, we expand the scope of nano-confinement to homopolymer-BCP blends. Lamella-forming BCPs of poly(styrene-b-butadiene) (PS-b-PBD) mixed with homopolymers of either PS or PBD were drawn, in the melt, into the pores of anodized aluminum oxide (AAO) membranes by the capillary force. Based on the detailed observation of BCP self-assembly within the porous columns, we analyzed the structural transition of BCPs induced by the presence of homopolymers and confinement. The effect of homopolymers on the micro-domain morphologies of BCPs is significantly amplified in the nanoscale confinement compared with the bulk state due to the frustration which polymer chains experience. |
