Robust ambient pressure dried polyimide aerogels and their graphene oxide directed growth of 1D–2D nanohybrid aerogels using water as the only solvent

Abstract

Here, using water as the only solvent, we report the first green approach to the morphological controlled synthesis of robust ambient dried polyimide aerogels composed of interconnected hollow spheres. The addition of graphene oxide can direct the growth of polyimide into nanofibers and form 1D-2D nanohybrid aerogels. The mechanism behind is a soft/hard template directed dissolution-polymerizationreprecipitation process. After carbonization, a monolith carbon aerogel with monodisperse micropores could be formed. Such a green approach for the morphology controlled synthesis of robust polyimide aerogels and their carbon aerogels should be of great value for their environmental and energy related applications.

Facile and environment-friendly preparation of high-performance polyimide aerogels using water as the only solvent

“…These were similar to the morphologies found in other PI aerogels. 35,43 The PI aerogels were obtained by the high temperature imidisation of the prepared PAAS precursor aerogels. The representative SEM images of the outer surface and internal structure of the PI aerogels are shown in Fig.…”

“…In recent years, hydrothermal syntheses of polyimides and polyimide aerogels have become a hot research area. Yang et al 35 used water as the only solvent for the synthesis of fully aromatic PI aerogels and their graphene nanohybrid aerogels through a soft/hard template-directed hydrothermal polymerisation process. However, their hydrothermal process required high temperatures and pressures, which consumed too much energy and time.…”

Direct 3D print polyimide aerogels for synergy management of thermal insulation, gas permeability and light absorption

“…Polyimide aerogels (PAs) have received tremendous attention and development in aerospace, Mars exploration, industrial buildings, and other elds owing to their unique mechanical properties, low density, high specic surface area, low thermal conductivity, low dielectric constant, superb thermal stability, and excellent chemical/radiation resistance. [1][2][3][4][5] However, PAs generally undergo large shrinkage (∼40%) during their fabrication processes, and their exceptionally high glass transition temperatures (>400 °C) and powerless melt processing due to lack of viscous ow and severely constricted subtractive manufacturing are caused by the insufficient mechanical tolerance of the hierarchically porous skeleton of the aerogel. 6,7 These make it difficult to manipulate PAs into arbitrary dimensions/geometries, ultimately limiting their performances and applications.…”

Hydrophobic and hydrophilic modification of hierarchically porous monolithic polyimide derivatives as functional liquid absorbers

“…[9][10][11] Because of these characteristics, they are widely applied in the adsorption, 12,13 catalysis, 14,15 energy storage, 16,17 and separation fields. 18,19 Therefore, various porous PIs have been reported, [20][21][22] and PI monoliths that enable further functionalization such as improvement of heat resistance, hydrophobicity, and the surface modification ability are required for a wide range of applications in the future.…”