| 초록 |
In this study, we systematically investigated the shear alignment of cylinder forming diblock copolymers (BCPs) in thin films: specifically, polystyrene-b-polymethylmetacrylate, (PS-b-PMMA), and polystyrene-b-poly2-vinylpyridine (PS-b-P2VP) are studied. We show that these BCPs can be effectively shear-aligned. We demonstrated that the alignment quality and properties were strongly dependent on shear stress, temperature and thickness. Interestingly, shear field can impact not only alignment of cylinders, but also the optimal thickness of PS-b-P2VP thin films. This difference of optimal thickness can be regarded as the effect of interfacial energy variations. In the case of PS-b-PMMA, Tof-SIMS was employed to investigate structures of PS-b-PMMA thin films and GI-SAXS experiments were conducted to investigate d-spacing, alignment quality and thermodynamic stability of thin films. |
