Beyond Nanoporosity: A CO2-Conditioned Glassy Matrix Contributes to the Brittle-to-Ductile Transition of Nanocellular Polyetherimide.
Nanocellular polyetherimide (PEI) exhibits enhanced toughness and impact resistance compared to the initial solid precursor, an effect usually attributed to the presence of nanometric cells within a confined glassy polymer matrix. In this work, we examine whether the CO2 saturation step used in gas dissolution foaming...