Fused deposition modeling of hierarchical porous polyetherimide assisted by an in-situ CO2 foaming technology

This work provides a novel approach to manufacture hierarchical porous parts via an in-situ foaming fused deposition modeling (FDM) method. The cell nucleation, growth, and stabilization occurred as the CO2-saturated polyetherimide (PEI) filament was heated, and the layer-by-layer deposition of porous strands was controlled by a planned path. The microporous structure with cell size of 2–30 μm and cell density of 1010−11 cells/cm3 was generated...