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Mechanically Strong Electrically Insulated Nanopapers with High UV Resistance Derived from Aramid Nanofibers and Cellulose Nanofibrils
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-03-15 , DOI: 10.1021/acsami.2c01597
Fugang Hu 1, 2, 3 , Jinsong Zeng 1, 2, 3 , Jinpeng Li 1, 2, 3 , Bin Wang 1, 2, 3 , Zheng Cheng 1, 2, 3, 4 , Tianguang Wang 1, 2, 3 , Kefu Chen 1, 2, 3
Affiliation  

Aramid nanofibers (ANFs) have great potential for civil and military applications due to their remarkable mechanical modulus, excellent chemical reliability, and superior thermostability. Unfortunately, the weak combination of neighboring ANFs limits the mechanical properties of ANF-based materials owing to their inherent rigidity and chemical inertness. Herein, high-performance nanopapers are fabricated by introducing a tiny amount of cellulose nanofibrils (CNFs) to serve as reinforcing blocks via vacuum filtration. As a result of the formation of nanosized building blocks and hydrogen-bonding interaction of CNFs, the resultant ANF/CNF nanopaper yields a record-high tensile strength (406.43 ± 16.93 MPa) and toughness (86.13 ± 5.22 MJ m–3), which are 1.8 and 4.3 times higher than those of the pure ANF nanopaper, respectively. When normalized by weight, the specific tensile strength of the nanopaper is as high as 307.90 MPa·g–1·cm3, which is even significantly superior to that of titanium alloys (257 MPa·g–1·cm3). The ANF/CNF nanopaper also possesses excellent dielectric strength (53.42 kV mm–1), superior UV-shielding performance (≥99.999% absorption for ultraviolet radiation), and a favorable thermostability (Tonset = 530 °C). This study proposes a new design strategy for developing ultrathin ANF-based nanopapers combined with high reliability and thermostability for application in high-end electrical insulation fields, such as 5G communication, wearable electronics, and artificial intelligence.

中文翻译:

源自芳纶纳米纤维和纤维素纳米纤维的机械强度高、耐紫外线性强的电绝缘纳米纸

芳纶纳米纤维 (ANFs) 因其卓越的机械模量、优异的化学可靠性和出色的热稳定性而在民用和军用应用中具有巨大潜力。不幸的是,由于其固有的刚性和化学惰性,相邻 ANF 的弱组合限制了基于 ANF 的材料的机械性能。在此,高性能纳米纸是通过引入微量的纤维素纳米原纤维 (CNF) 通过真空过滤作为增强块来制造的。由于纳米结构单元的形成和 CNF 的氢键相互作用,所得 ANF/CNF 纳米纸产生了创纪录的高拉伸强度 (406.43 ± 16.93 MPa) 和韧性 (86.13 ± 5.22 MJ m –3),分别是纯 ANF 纳米纸的 1.8 倍和 4.3 倍。当按重量归一化时,纳米纸的比抗拉强度高达307.90 MPa·g –1 ·cm 3,甚至明显优于钛合金(257 MPa·g –1 ·cm 3)。ANF/CNF纳米纸还具有优异的介电强度(53.42 kV mm –1)、优异的紫外线屏蔽性能(紫外线辐射吸收率≥99.999%)和良好的热稳定性(T onset= 530 °C)。本研究提出了一种新的设计策略,用于开发具有高可靠性和热稳定性的超薄 ANF 纳米纸,用于 5G 通信、可穿戴电子产品和人工智能等高端电绝缘领域。
更新日期:2022-03-15
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