聚酰亚胺纤维增强SiO<sub>2</sub>气凝胶的制备及表征

doi:10.11896/cldb.201904029

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Abstract The PI fiber-reinforced SiO₂ aerogel composite was prepared by sol-gel method and supercritical drying, taking tetraethylorthosilicate (TEOS) as silicon source and polyimide (PI) fiber as the reinforcing phase. The Fourier transform infrared spectroscopy, N₂ adsorption desorption spectrometer, field emission scanning electron microscope, universal testing machine, TGA and thermal conductivity meter were adopted to cha-racterize the chemical composition, microstructure, mechanical properties and thermal properties of the SiO₂ aerogels. The obtained aerogel pre-sents low density and high surface area, as well as favorable thermal insulation, thermal stability and compressibility. When 3wt% PI fiber is ad-ded, the aerogel shows satisfactory properties with density of 0.13 g/cm³, specific surface area of 997 m²/g and average pore diameter of 18.2 nm. And it also exhibits good thermal conductivity (0.029 1 W/(m·K)) at room temperature, a 5% mass loss in the range of room temperature to 500 ℃ and compressive strength of 0.21 MPa. The low density, high specific surface area, good thermal insulation and mechanical properties of the aerogel enable its broad application prospects in the field of ship thermal insulation.

Key words： SiO₂ aerogel polyimide fiber high surface area mechanical properties thermal properties

Published: 11 March 2019

CLC number:

TB332

Fund:This work was financially supported by the National Natural Science Foundation of China (51802347).

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	Articles by authors
	GAO Wenjie
	YANG Zichun
	LI Kunfeng
	FEI Zhifang
	CHEN Guobing
	ZHAO Shuang

Cite this article:

GAO Wenjie,YANG Zichun,LI Kunfeng, et al. Preparation and Characterization of Polyimide Fiber Reinforced Silica Aerogel[J]. Materials Reports, 2019, 33(4): 714-718.

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http://www.mater-rep.com/EN/10.11896/cldb.201904029 OR http://www.mater-rep.com/EN/Y2019/V33/I4/714

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