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Rigid/flexible molecular structure‐induced polyimide aerogels with ultralow permittivity and thermal insulation properties

Authors :
Xiaodi Dong
Baoquan Wan
Lin Qiu
Ming‐Sheng Zheng
Jiefeng Gao
Jun‐Wei Zha
Source :
IET Nanodielectrics, Vol 6, Iss 3, Pp 76-85 (2023)
Publication Year :
2023
Publisher :
Wiley, 2023.

Abstract

Abstract A series of high‐performance linear and cross‐linked polyimide (PI) aerogels with different molecular structures have been successfully synthesised using the freeze‐drying process. In this study, the comprehensive regulation of microstructure, thermodynamic, thermal insulation and dielectric properties of PI aerogels are achieved by controlling the rigid/flexible structure and composition of polymerised monomers. The increase in rigidity of PI molecular structure could promote the formation of denser pores, which is beneficial to improve the thermodynamic and thermal insulation properties of aerogels. Notably, the cross‐linked PI aerogel prepared by introducing cross‐linking agent (tris(4‐aminophenyl) amine, [TPA]) into linear PI exhibits high thermal stability (Td5% > 560°C), excellent ultralow permittivity (εr = 1.31, f = 106 Hz) and good thermal insulation property (k = 0.056 W/m · K). This innovative strategy promotes the wider application of the cross‐linked polyimide aerogel in the field of integrated circuits and aerospace exploration.

Details

Language :
English
ISSN :
25143255
Volume :
6
Issue :
3
Database :
Directory of Open Access Journals
Journal :
IET Nanodielectrics
Publication Type :
Academic Journal
Accession number :
edsdoj.bceba57b31d542729b8b874c9e5873f8
Document Type :
article
Full Text :
https://doi.org/10.1049/nde2.12041