| 초록 |
Hydrostatic pressure effect on the phase transition of polystyrene-block-poly(n-pentyl methacrylate) [PS-b-PnPMA] copolymer was investigated by FTIR spectroscopy. The size of closed-loop consisting of both the lower disordered-to-ordered transition (LDOT) and the upper ordered-to-disordered transition (UODT) became smaller with increasing pressure, which is consistent with results obtained from small angle neutron scattering. At a lower temperature region, with increasing pressure, PnPMA chains become frozen because of cluster formation of alkyl chain. On the other hand, at a higher temperature region, it is difficult to maintain the ordered states due to side chain motion. This indicates that UDOT is more sensitive than LDOT with pressure. |
