| 초록 |
Much of the focus on nanoparticle/block copolymer nanocomposites has been on the passive dispersion of nanoparticles in block copolymer matrices. However, appropriately tuned nanoparticles in block copolymer thin films segregate to both the substrate and free surface to effectively neutralize interfacial interactions and induce perpendicular orientation of microdomains on untreated silicon substrate. In this research, P(S-r-MMA) star polymers synthesized via the arm-first method were used as organic nanoparticles and used as additives in PS-b-PMMA thin films. The effects of arm composition, arm length, and star polymer content, and film thickness on the morphology, orientation, and ordering of block copolymer matrices were investigated. It was found that the microdomains orient perpendicular to the substrate when the star polymer had a “neutral” composition, functioning as a neutral layer between the thin film and substrate. |
