文献类型：期刊文献

英文题名：A simple and efficient method for preparing covalent organic framework aerogels with ultra-light and super-elastic

作者：Ma, Qi[1];Zeng, Lan[1];Liu, Xiaoyun[1];Zhuang, Qixin[1];Qian, Jun[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Key Lab Specially Funct Polymer Mat & Related Tec, Minist Educ, Shanghai 200237, Peoples R China

年份：2022

卷号：331

外文期刊名：MICROPOROUS AND MESOPOROUS MATERIALS

收录：;EI(收录号：20215111365913);WOS:【SCI-EXPANDED(收录号:WOS:000750693700005)】；

基金：This work was financially supported by the National Natural Science Foundation of China (22171086 and 52073091) , and Shanghai Natural Science Foundation (20ZR1414600) .

语种：英文

外文关键词：COF; Aerogels; Ultralight; Superelasticity; Low dielectric constant

摘要：In this paper, large-sized covalent organic framework (COF) aemgels were prepared using high-efficiency catalysis under room temperature combined with rapid gel and freeze-drying methods for the first time. Two kinds of COF aemgels with rigid and semi-rigid building blocks were prepared using this method, having good mechanical strength (126 and 106 kPa), elasticity (aerogels structure remains intact after 10 cycles), thermal insulation properties (low thermal conductivity of 0.03 wm(-1) K-1), low dielectric constant (1 kHz of 1.21 and 1.51), thermal stability and solvent stability, and ultra-light characteristics (densities of 0.029 and 0.040 g cm(-3) ). Compared to the traditional COF methods that generally result in small particles, the high-efficiency catalysis method developed in this paper can be used to prepare large-sized COF aemgels under mild reaction temperatures and within less time conducive to industrial production. This method is expected to greatly broaden the application field and application scope of COF materials.