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

Published on Nov 10, 2020in Composites Science and Technology7.094
· DOI :10.1016/J.COMPSCITECH.2020.108454
Mengya Li1
Estimated H-index: 1
,
Junjie Jiang3
Estimated H-index: 3
+ 1 AuthorsWentao Zhai2
Estimated H-index: 2
Source
Abstract
Abstract 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  μ m and cell density of 1010−11 cells/cm3 was generated inside and on the surface of the porous PEI strand, and the macroporous structure with size of about 1–50 mm was constructed within the porous PEI honeycombs and cylinder. The compressed CO2 exhibited extremely slow diffusivity in PEI filaments, and the stable CO2 content ensured that the hierarchical porous PEI part could be 3D printed with high accuracy for a long time.
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