| 초록 |
The reduction of domain sizes of block copolymer thin films have attracted attention because of many applications such as nanolithography. Especially, PS-b-PMMA is widely used in thin films because PMMA block is easily removed by UV irradiation. Total segment number (N) is one of the factor that can control the self-assembly of block copolymer. It is possible to create small domain sizes by decreasing the N of block copolymer. However, the incompatibility between two blocks is too weak for microphase separation when N is too small. Here, we are trying to make the block copolymer which has a propensity to form columnar structures via π-stacking interactions. Star-shaped PS-b-PMMA will be synthesized by using Hexa-peri-hexabenzocoronenes (HBCs) as a core of the star-shape. For this purpose, 6 hydroxyl groups on HBCs will be replaced with bromine groups by the reaction with BIBB that is the initiation site of ATRP for PS and PMMA. We characterized that HBCs by NMR and MALDI-TOF. |
