| 초록 |
In the baroplastic block copolymers (BCPs), the compressibility issue pertaining to the enhanced miscibility with pressure has been an attractive topic, because an ordered state of the baroplastic BCPs becomes a phase-mixed state (or disordered phase) between the two dissimilar blocks upon pressurizing. In this study, we produced various phase transitions in the miscible BCP blends composed of polystyrene-b-poly(n-butyl methacrylate) (PS-b-PnBMA) / deuterated-polystyrene-b-poly(n-hexyl methacrylate) (dPS-b-PnHMA). Together, with thermodynamic analysis of baroplasticity based on the values of enthalpic and volumetric changes at various phase transitions, we demonstrated that baroplastic nature for the miscible BCP blends was attributed dominantly to the entropic compressibility that was characterized by the negative volume change on mixing (∆Vmix) at phase transitions. |
