| 초록 |
We demonstrate that the introduction of short middle block can manipulate the effective interaction parameters between A and B blocks. For example, in the polystyrene (PS) and polymethyl methacrylate (PMMA) based BCPs, the short middle block of PS-r-PMMA (R) was incorporated to prepare the ARB type triBCPs. In this case, it was expected that the R block increases effective dispersity via compositional distribution, leading to an increased domain size compared to the AB diBCP with same MW and dispersity. As another example, we synthesized AHB-type triBCP, where A and B represent the PS and PMMA blocks, and H represents a short poly(methacrylic acid) (PMAA) that can form hydrogen bonds with the same PMAA (H block) or with PMMA (B block). Due to the hydrogen bonding, we hypothesized the enhanced intermolecular interactions at the domain interface will increase the effective χ, thereby increasing the ODT as compared with AB diblock with the same molecular weight. |
