Semi-interpenetrating networks of ANF/SiO2 composite aerogel with lightweight, compressible, and excellent flame retardancy properties

IF 3.2 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of Non-crystalline Solids Pub Date : 2024-10-11 DOI:10.1016/j.jnoncrysol.2024.123256

Xiaotong Zheng, Fuhai Guo, Yuanyuan Liu, Guangli Hu, Qingfu Wang, Minghan Xu

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Abstract

To design ultralight nanocomposite aerogels with good compatibility of different components, excellent thermostability, flame retardancy and strength is an urgent issue to be addressed. In this work, we fabricated a lightweight, compressible aramid nanofiber/silicon dioxide (ANF/SiO₂) composite aerogel by sol-gel method. The homogeneous SiO₂ knots were formed in-situ among the nanofibers resulting a semi-interpenetrating network structure. Due to the supporting effect of the ANF on the overall skeleton and the inhibiting effect of SiO₂ the compression properties of the ANF/SiO₂ aerogels were significantly improved. In addition, the aerogel shows low thermal conductivity, excellent thermal stability and flame retardancy meanwhile advanced self-extinguishing properties even after two minutes combustion. The design does not rely on any toxic or corrosive substances and provides a new insight into the preparation of composite aerogels with green, compressibility, thermal insulation and excellent flame retardancy.

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具有轻质、可压缩和优异阻燃性能的 ANF/SiO2 复合气凝胶半互穿网络

如何设计出具有不同成分良好兼容性、优异热稳定性、阻燃性和强度的超轻纳米复合气凝胶是一个亟待解决的问题。在这项工作中，我们采用溶胶-凝胶法制备了一种轻质、可压缩的芳纶纳米纤维/二氧化硅（ANF/SiO2）复合气凝胶。均匀的二氧化硅结在纳米纤维之间原位形成，从而形成了半穿透的网络结构。由于 ANF 对整体骨架的支撑作用和 SiO2 的抑制作用，ANF/SiO2 气凝胶的压缩性能得到了显著改善。此外，气凝胶还具有低导热性、出色的热稳定性和阻燃性，同时在燃烧两分钟后仍具有先进的自熄性能。该设计不依赖任何有毒或腐蚀性物质，为制备具有绿色、可压缩、隔热和优异阻燃性能的复合气凝胶提供了新的思路。

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来源期刊

Journal of Non-crystalline Solids 工程技术-材料科学：硅酸盐

CiteScore

6.50

自引率

11.40%

发文量

576

审稿时长

35 days

期刊介绍： The Journal of Non-Crystalline Solids publishes review articles, research papers, and Letters to the Editor on amorphous and glassy materials, including inorganic, organic, polymeric, hybrid and metallic systems. Papers on partially glassy materials, such as glass-ceramics and glass-matrix composites, and papers involving the liquid state are also included in so far as the properties of the liquid are relevant for the formation of the solid. In all cases the papers must demonstrate both novelty and importance to the field, by way of significant advances in understanding or application of non-crystalline solids; in the case of Letters, a compelling case must also be made for expedited handling.