大规模生产累托石纳米片及其与芳纶纳米纤维的共组装用于高性能电绝缘纳米纸,Advanced Materials

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大规模生产累托石纳米片及其与芳纶纳米纤维的共组装用于高性能电绝缘纳米纸
Advanced Materials ( IF 27.4 ) Pub Date : 2022-09-09 , DOI: 10.1002/adma.202206855
Xiao-Feng Pan ₁ , Guan-Hua Yu ₁ , Huai-Ling Gao ₁ , Zhe-Zhao Wang ₁ , Zhiwei Bao ₂ , Xiaoguang Li ₂ , Shu-Hong Yu ₁

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与原料累托石微片（RMs）相比，累托石纳米片（RNs）具有更大的纵横比、更高的表面反应活性以及内在优越的机械和物理性能，在制备先进复合材料方面具有更大的应用前景。然而，高效制备RN的难度极大地限制了它们的大规模应用。在这里，开发了一种可扩展的聚乙烯吡咯烷酮辅助搅拌方法，以从丰富的天然 RM 中制备超薄 RN。更高的生产率（≈0.675 gh ^-1) 与大多数其他纳米片相比。此外，本文提出了一种有效的聚（二烯二甲基氯化铵）辅助沉降策略，而不是使用传统的耗时耗能的高速离心，以快速将剥离的 RN 从 RN 分散体中分离出来。然后，RNs 与芳纶纳米纤维 (ANFs) 共同组装成大规模的仿珍珠层 ANF-RN 纳米纸，与纯 ANF 纳米纸和 ANF-RM 微纸相比，其机械、电绝缘和耐高温性能显着增强. 此外，这些性能优于先前报道的基于 ANF 的纳米纸和商业绝缘微纸。

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Large-Scale Production of Rectorite Nanosheets and Their Co-Assembly with Aramid Nanofibers for High-Performance Electrical Insulating Nanopapers

Compared with raw rectorite microplatelets (RMs), rectorite nanosheets (RNs) have considerably greater application prospects in the preparation of advanced composite materials because of their larger aspect ratio, higher surface reactivity, and intrinsically superior mechanical and physical properties. However, the difficulty in the efficient preparation of RNs significantly limits their large-scale applications. Here, a scalable poly(vinylpyrrolidone)-assisted stirring approach is developed to prepare ultrathin RNs from the abundant natural RMs. A higher production rate (≈0.675 g h⁻¹) is achieved compared with that of most other nanosheets. Additionally, instead of using conventional time- and energy-consuming high-speed centrifugation, an efficient poly(dienedimethylammonium chloride)-assisted sedimentation strategy is proposed here to rapidly separate the exfoliated RNs from the RN dispersion. Then, the RNs are co-assembled with aramid nanofibers (ANFs) into large-scale nacre-mimetic ANF-RN nanopapers with considerably enhanced mechanical, electrical insulating, and high-temperature-resistant properties compared with pure ANF nanopapers and ANF-RM micropapers. Moreover, these properties are superior to those of previously reported ANF-based nanopapers and commercial insulating micropapers.

更新日期：2022-09-09

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