芳纶
材料科学
气凝胶
复合材料
热导率
复合数
保温
消散
过热(电)
结构工程
工程类
图层(电子)
电气工程
纤维
物理
热力学
作者
Jianpeng Wu,Yu Wang,Junshuo Zhang,Chunyu Zhao,Ziyang Fan,Quan Shu,Xiaokang He,Shouhu Xuan,Xinglong Gong
出处
期刊:Matter
[Elsevier]
日期:2022-07-01
卷期号:5 (7): 2265-2284
被引量:29
标识
DOI:10.1016/j.matt.2022.04.031
摘要
Summary
Material designs for safety protection are increasingly important due to ubiquitous impact damage and thermal hazard. Recent biomimetic architectures achieve extraordinary safeguards but exhibit a single-defense function, which remains a formidable challenge in mechanical-thermal-coupled protection. Herein, a lightweight composite (AFSG) with a shear stiffening gel (SSG)-filled aramid nanofiber (ANF) aerogel structure is developed through infiltration and lamination. Benefiting from the voids-SSG coexistence construction achieved by retaining massive microvoids in densified aerogel networks, AFSG exhibits ultralow thermal conductivity (0.09 W m−1 k−1) and high-impact force dissipation. Specifically, microvoids inside AFSG greatly block heat transfer and achieve a wide insulation temperature (–120 to 300°C). SSG and the laminated-layout structure effectively attenuate 65%–79% of impact force through structure hardening, interlayer sliding, and intralayer cracking. Such a versatile, lightweight structural composite is expected to defend against simultaneous mechanical impact and heat damage as an ideal candidate for next-generation protective materials applied in transportation, military, and aerospace fields.
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