A synergistic strategy for fabricating an ultralight and thermal insulating aramid nanofiber/polyimide aerogel,Materials Chemistry Frontiers

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A synergistic strategy for fabricating an ultralight and thermal insulating aramid nanofiber/polyimide aerogel
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020-10-30 , DOI: 10.1039/d0qm00724b
Xinhai Zhang _{1,

2,

3} , Xingxing Ni _{1,

2,

3} , Meiyun He _{1,

2,

3} , Yujie Gao _{1,

2,

3} , Chenxi Li _{1,

2,

3} , Xiaoliang Mo _{1,

2,

3} , Gang Sun _{2,

3,

4} , Bo You _{1,

2,

3}

Affiliation

Shortcomings of the otherwise very desirable ultralight nanocomposite aerogels urgently need to be solved, such as the poor compatibility of different components, low thermal decomposition temperature, and low production. Herein, a synergistic strategy using ultrahigh-speed homogenizing, freeze drying, and high-temperature imidization methods was proposed to fabricate an ultralight aramid nanofiber/polyimide (ANF/PI) composite aerogel from aramid nanofibers and water-soluble polyamide acid salt, which possess similar chemical structures. The polyamide acid salt greatly inhibited the aggregation of aramid nanofibers without any additional dispersant due to hydrogen bond interactions. The uniform aramid nanofiber skeleton decreased the shrinkage of the low concentration of polyamide acid salt during imidization. This synergistic effect contributed to the porous structure and ultralow density (5.18 mg cm⁻³) of the ANF/PI nanocomposite aerogel. The aerogel showed excellent elasticity, fatigue resistance (1000 compressive cycles), high thermal decomposition temperature (470 °C), and ultralow thermal conductivity (28.6 ± 0.53 mW (m K)⁻¹). Therefore, it has excellent application prospects in various fields, including heat management, thermal insulation, lightweight construction, water treatment, and vibration or shock energy damping, especially in harsh environments.

中文翻译：

制备超轻和隔热芳族聚酰胺纳米纤维/聚酰亚胺气凝胶的协同策略

迫切需要解决原本非常理想的超轻纳米复合气凝胶的缺点，例如不同组分的相容性差，热分解温度低和产量低。本文提出了一种利用超高速均质化，冷冻干燥和高温酰亚胺化的协同策略，由芳纶纳米纤维和水溶性聚酰胺酸盐制备超轻芳纶纳米纤维/聚酰亚胺（ANF / PI）复合气凝胶。类似的化学结构。由于氢键相互作用，聚酰胺酸盐极大地抑制了芳族聚酰胺纳米纤维的聚集，而没有任何额外的分散剂。均匀的芳族聚酰胺纳米纤维骨架减少了酰亚胺化过程中低浓度聚酰胺酸盐的收缩。^-3）的ANF / PI纳米复合气凝胶。气凝胶显示出优异的弹性，抗疲劳性（1000个压缩循环），较高的热分解温度（470°C）和超低的导热性（28.6±0.53 mW（m K）^-1）。因此，它在热管理，绝热，轻质结构，水处理以及振动或冲击能量阻尼等各个领域具有出色的应用前景，尤其是在恶劣的环境中。

更新日期：2020-12-10

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