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Latest Research Report on Polyimide Aerogel

Release time:

2021-08-31 17:07

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We have made a detailed study on the thermal conductivity of aromatic polyimide aerogels.4,4 '-diaminodiphenyl ether and3,3’,4,4 '-diphthalic acid dianhydride as monomer,1,3,5-Three amino phenoxy benzene as a cross-linking agent, using sol.—Gel method to obtain polyimide sol, through.CO₂Supercritical drying to obtain a polyimide aerogel. For the obtained samples, respectively.N₂andCO₂The thermal conductivity test was carried out in the atmosphere and found that.CO₂The atmosphere has a lower thermal conductivity, as shown in the figure.1shown. The effect of gas temperature and pressure on thermal conductivity was studied, and it was found that the thermal conductivity of the sample would gradually increase regardless of the increase in temperature or pressure, as shown in the figure.2,3shown.

Figure1 Thermal conductivity changes in different atmospheres Figure2 Variation of thermal conductivity at different temperatures Figure3Changes in thermal conductivity under different pressures

We chose a new type of diamine monomer2,2-Double[4-（4-aminophenyl) phenyl]Propane and4,4’—diaminodiphenyl ether together as a diamine,3,3’,4,4 '-The polyamic acid solution is synthesized by diphthalic acid dianhydride, and a kind of amphoteric aminosilane is used as a crosslinking agent to obtain a crosslinked polyimide aerogel. The addition of new monomers makes the polyimide aerogel hydrophobic, as shown in the figure.4shown. At the same time, because the new monomer contains ether bridging part, the solubility of the sample is increased. On the other hand, due to the presence of methyl group on the side chain, the polarity of the molecule is weakened to a certain extent, and the solubility of polyimide is also increased, as shown in the figure.5shown.