Dual-crosslinked reduced graphene oxide/polyimide aerogels possessing regulable superelasticity, fatigue resistance, and rigidity for thermal insulation and flame retardant protection in harsh conditions

被引：4

作者：

Xie, Mingzhu ^{[1
]}

Qian, Guangtao ^{[2
]}

Ye, Qibin ^{[1
]}

Zhang, Yicai ^{[1
]}

Wang, Mengxia ^{[1
]}

Deng, Zhiqing ^{[3
]}

Yu, Youhai ^{[1
]}

Chen, Chunhai ^{[1
]}

Li, Hui ^{[1
]}

Li, Dandan ^{[1
]}

机构：

[1] Donghua Univ, Coll Mat Sci & Engn, Ctr Adv Low dimens Mat, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China

[2] Donghua Univ, Collaborat Innovat Ctr Civil Aviat Composites, 2999 North Renmin Rd, Shanghai 201620, Peoples R China

[3] Shanghai Inst Precis Measurement & Test, Shanghai 201109, Peoples R China

来源：

JOURNAL OF COLLOID AND INTERFACE SCIENCE | 2024年 / 676卷

关键词：

Polyimide aerogels; Anisotropy; Superelastic; High-strength; Thermal insulation; Flame resistant; MECHANICAL-PROPERTIES; SILICA AEROGELS; CELLULOSE; LIGHTWEIGHT; GEL;

D O I：

10.1016/j.jcis.2024.07.095

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Polyimide (PI) aerogels have various applications in aerospace, national defense, military industry, and rail transit equipment. This paper reports a series of ultra-lightweight, high elasticity, high strength, low thermal conductivity, and high flame retardant rGO/PI nanocomposite aerogels prepared by the ice templating method. The effects of freezing processes (unidirectional freezing and random freezing), chemical composition, and environmental temperature (- 196-200 degrees C) on the morphology, mechanical, and thermal properties of the aerogels were systematically studied. The results indicated that unidirectional aerogels exhibit anisotropic mechanical properties and thermal performance. Compression in the horizontal direction showed high elasticity, high fatigue resistance, and superior thermal insulation. Meanwhile, in the vertical direction, it demonstrated high strength (PI-G-9 reaching 14 MPa). After 10,000 cycles of compression in the horizontal direction (at 50 % strain), the unidirectional PI-G-5 aerogel still retains 90.32 % height retention, and 78.5 % stress retention, and exhibited a low stable energy loss coefficient (22.11 %). It also possessed a low thermal conductivity (32.8 mW m- 1 K-1) and demonstrated good thermal insulation performance by sustaining at 200 degrees C for 30 min. Interestingly, the elasticity of the aerogels was enhanced with decreasing temperatures, achieving a height recovery rate of up to 100 % when compressed in liquid nitrogen. More importantly, the rGO/PI aerogels could be utilized over a wide temperature range (- 196-200 degrees C) and had a high limiting oxygen index (LOI) ranging from 43.3 to 48.1 %. Therefore, this work may provide a viable approach for designing thermal insulation and flameretardant protective materials with excellent mechanical properties that are suitable for harsh environments.

引用

页码：1011 / 1022

页数：12