Fig. 3: Gelation and backbone strength of CPI gel fibers. | Nature Communications

Fig. 3: Gelation and backbone strength of CPI gel fibers.

From: Fast and scalable production of crosslinked polyimide aerogel fibers for ultrathin thermoregulating clothes

Fig. 3: Gelation and backbone strength of CPI gel fibers.

a Photographs showing the extrusion of PI (left) and PPI-100 (right) spinning solution into the NMP solvent under UV radiation. Inset shows the spun fibers collected in coagulating bath. b Storage modulus (G’) and loss modulus (G”) of PI (gray) and PPI (red) solution before and after UV irradiation. c Photograph of the CPI gel fibers. d Schematic illustration of the chemical structure evolution, and (e) gelation kinetics of UV-enhanced gelation strategy (red), condensation reaction strategy (green), chemical crosslinking strategy (blue) and ionic crosslinking strategy (gray), respectively. f Time consumption of preparing aerogel fibers through our strategy compared to previous gelation strategies. Colors in the graphs are: purple (Gelation/Aging time), salmon (solvent exchange) and yellow (Drying time).

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