Layer-multiplying coextrusion technology was used to produce multilayered films of polystyrene (PS) and polycarbonate (PC). The multilayered films with PS layer thickness down to 20 nm were extruded. The structural relaxation of polystyrene under PC confinement was investigated using two approaches. In the first method, the PS layers were cooled from the melt at different rates. The subsequent heating thermograms revealed that the relaxation of the PS was similar to the bulk sample. Another experiment included physical aging of PS layers below the bulk Tg at 80°C. The subsequent heating thermograms showed that the aging rate of PS remained unchanged under confinement.
展开▼
