Citation:
LIANG Yi, LU Yun, YAO Wei-Shang, ZHANG Xue-Tong. Polyimide Aerogels Crosslinked with Chemically Modified Graphene Oxide[J]. Acta Physico-Chimica Sinica,
;2015, 31(6): 1179-1185.
doi:
10.3866/PKU.WHXB201504146
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Polyimide (PI) aerogels, which are generally crosslinked using expensive chemical crosslinking agents, are novel porous materials with high strength, high heat resistance, high porosity, and low density. Graphene oxide ( ) is a functional nanofiller that has aroused wide interest in recent years. The reported PI/ composites have mostly been in the form of fibers and films. In this study, PI/ composite aerogels were obtained using chemically modified graphene oxide (m- ) as the crosslinking agent, instead of traditional ones such as 1,3,5-triaminophenoxybenzene (TAB), by reaction with 4,4'-oxydianiline (ODA) and 3,3',4,4'- biphenyltetracarboxylic dianhydride (BPDA). The chemical modification of was achieved by reacting with excess ODA using a hydrothermal method. The microstructures of the PI/m- aerogels were investigated using scanning electron microscopy (SEM). Nitrogen sorption tests, thermogravimetric analysis, and a hot-wire method were used to investigate the effects of m- on the pore properties, thermal stabilities, and thermal conductivities, respectively, of the resulting aerogels. The results show that the PI/m- aerogels are highly porous, thermally stable, and heat insulating. Compression tests showed that the PI aerogel prepared using 0.6% (mass fraction, w) m- instead of 1.8% (w) TAB as the crosslinking agent had a higher specific Young's modulus [Young's modulus/density (ρ)] and specific yield strength (yield strength/ρ), and less shrinkage.
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