Co-polyimide aerogel using aromatic monomers and aliphatic monomers as mixing diamines
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A novel co-polyimide aerogel using aromatic monomers (4,4′-diaminodiphenyl ether, ODA) and aliphatic monomers (1,3-Diaminopropa) as mixing diamines has been prepared via the sol–gel technique. The effects on the properties (density, shrinkage, surface area, and average pore size) of co-polyimide aerogel have been investigated by changing the molar ratios of mixing diamines. The density of co-polyimide aerogel reaches as low as 0.0448 g cm−3, because of replacing part of ODA (M = 269.5) in the backbone with 1,3-diaminopropa (molecular M = 76.1).The thermal conductivities reach as low as ~0.031 W m−1 K−1 (25 °C), BET surface areas are 331 m2 g−1 and the compressive modulus range from 1.253 to 3.273 MPa. The facile preparation route and low thermal conductivity indicate that co-polyimide aerogels may be ideal candidates for aerospace and thermal insulations.
We have developed a sol–gel route to synthesize co-polyimide aerogel using aromatic monomers (ODA) and aliphatic monomers (1,3-diaminopropa) as mixing diamines.
The density of co-polyimide aerogel reaches as low as ~0.0448 g cm−3.
The thermal conductivities of co-polyimide aerogel reach as low as ~0.031 W m−1 K−1 (25 °C).
Key wordsSol–gel Polyimide Aerogel Thermal conductivity Mesoporous
This work was financially supported by the Program for Changjiang Scholars and Innovation Research Team in University (No. IRT_15R35), Industry Program of Science and Technology Support Project of Jiangsu Province (BE2016171, BE2017151), the National Natural Science Foundation of China (51702156), the Natural Science Foundation of Jiangsu Province (BK20161002, BK20161003), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (SJLX_0296), Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD). Any opinions, findings and conclusions or recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of those programs.
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Conflict of interest
The authors declare that they have no conflict of interest.
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