Porous polyetherimide fiber fabricated by a facile micro-extrusion foaming for high temperature thermal insulation
M Zhou, M Li, J Jiang, Y Li, H Liu, B Chen, D Zhao… - Journal of CO2 …, 2022 - Elsevier
In this work, we reported a novel micro-extrusion foaming process using CO 2 as a physical
foaming agent to fabricate porous polyetherimide (PEI) fibers with open-cell skin and
submicrocellular core. A high cell nucleation rate was triggered due to a high gas solubility
during the temperature-rise foaming process within the extrusion head. The time-limited cell
growth and cell coalescence with foaming time less than 3.95 s were the fundamental
reasons for the fabrication of porous PEI fibers with submicrocellular size of about 550 nm …
foaming agent to fabricate porous polyetherimide (PEI) fibers with open-cell skin and
submicrocellular core. A high cell nucleation rate was triggered due to a high gas solubility
during the temperature-rise foaming process within the extrusion head. The time-limited cell
growth and cell coalescence with foaming time less than 3.95 s were the fundamental
reasons for the fabrication of porous PEI fibers with submicrocellular size of about 550 nm …
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