Lin Tang, Yusheng Tang, Junliang Zhang, Yuhan Lin, Jie Kong, Kun Zhou* and Junwei Gu*. High-strength super-hydrophobic double-layered PBO nanofiber-polytetrafluoroethylene nanocomposite paper for high-performance wave-transparent applications. Science Bulletin, 2022, 67(21): 2196-2207. 2021IF=20.577.（1區綜合類Top期刊，中國科技期刊卓越行動計劃-領軍類期刊項目，2021中國最具國際影響力學術期刊）
https://doi.org/10.1016/j.scib.2022.10.011
Abstract
Poly(p-phenylene-2, 6-benzobisoxazole) nanofiber (PNF) paper is facing unprecedented challenges in enhancing the interaction between the PNFs and improving its hydrophobicity. In this work, a sol–gel film transformation approach was developed to fabricate high-strength PNF paper. Iron ions formed coordination bonds between PNFs to obtain a preforming three-dimensional, interconnective nanofiber network. Subsequently, polytetrafluoroethylene (PTFE) particles were sprayed onto the surface of the paper, followed by thermal treatment to obtain double-layered PTFE-P/PNF nanocomposite paper. The nanocomposite paper presents incredible tensile strength (271.6 MPa, increased by 52.9%), folding endurance, super-hydrophobicity, and self-cleaning performances. Moreover, it exhibits low dielectric constant (2.06) and dielectric loss tangent (0.0133) values. According to the wave-transparent model for a double-layered dielectric established by Maxwell’s equations, the wave-transparent coefficients of electromagnetic waves incident from both sides of the paper are 97.6% (PNF side) and 96.0% (PTFE/P(S-co-BCB-co-MMA) side), respectively. The PTFE-P/PNF nanocomposite paper possesses great potential in the fields of wave-transparent applications.
聚對苯撐苯并二噁唑（PBO）纖維衍生的PBO納米纖維（PNFs）紙在航空/航天、交通運輸和5G通訊等領域具有廣闊的應用前景。如何改善PNFs間的相互作用力以及提高PNFs紙的疏水性能，仍是該領域的一個難點。本文通過Fe3+與PNFs表面N原子的配位作用在PNFs間構建金屬配位鍵，并通過溶膠-凝膠-薄膜轉化法制備PNFs紙。進而在PNFs紙表面噴涂聚四氟乙烯（PTFE）顆粒/P(S-co-BCB-co-MMA)混合溶液，通過熱交聯制備雙層結構PTFE-P/PNFs納米復合紙。基于金屬配位鍵和氫鍵的雙重作用，PTFE-P/PNFs納米復合紙具有優異的抗拉強度(271.6 MPa，提高52.9%)、耐折性、超疏水性和自清潔性能。此外，它具有較低的介電常數（2.06）和介電損耗正切（0.0133）值。根據麥克斯韋方程組建立的雙層介質透波模型，電磁波從PTFE-P/PNFs納米復合紙的兩側入射的透過率分別為97.6%（PNF側）和96.0%（PTFE/P(S-co-BCB-co-MMA)側）。本工作研制的高強度、超疏水聚對苯撐苯并二噁唑納米透波復合紙有望在航空/航天、交通運輸和5G通訊的雷達天線罩、電磁窗等領域獲得廣泛的應用。
本文亮點
1. 通過Fe3+與PNFs表面N原子的配位作用在PNFs間構建金屬配位鍵，賦予PTFE-P/PNFs納米復合紙優異的力學性能。
2. PNFs與P(S-co-BCB-co-MMA)之間形成較強的π-π相互作用，使PTFE/P(S-co-BCB-co-MMA)涂層較好的黏附在PNFs紙表面。
3. 基于雙層板透波模型，電磁波從PTFE-P/PNFs納米復合紙兩側入射的透過率分別高達97.6%（PNFs側）和96.0%（PTFE/P(S-co-BCB-co-MMA)側）。
第一作者：唐林
郵件地址：lintang@mail.nwpu.edu.cn
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