Dynamic Behavior of Pressure‐Responsive Microphase‐Separated Diblock Copolymers

ABSTRACT The dynamics of pressure‐induced order–disorder transitions in diblock copolymer systems and their effect on the flow properties are investigated. A dynamically extended compressible self‐consistent field theory allows us to study nonequilibrium copolymer systems under high pressure. The theory reveals that the differential reduction of free volume across different polymer segments drives the order–disorder transition upon pressure. The pressure‐induced transitions lower the energy required for deformations, supporting experimental observations on the low‐temperature processability of diblock copolymer materials as a sustainable solution. These findings advance the fundamental understanding of nonequilibrium phase behavior in block copolymers and provide valuable insights for designing polymeric materials with tailored low‐temperature processability, based on a clear physical picture of pressure‐induced phase transitions.