Shaanxi Key Laboratory of Macromolecular Science and Technology, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore.
Sci Bull (Beijing). 2022 Nov 15;67(21):2196-2207. doi: 10.1016/j.scib.2022.10.011. Epub 2022 Oct 13.
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.
聚对苯撑苯并双恶唑纳米纤维（PNF）纸在增强 PNF 之间的相互作用和提高其疏水性方面面临着前所未有的挑战。在这项工作中，开发了一种溶胶-凝胶膜转化方法来制备高强度 PNF 纸。铁离子在 PNF 之间形成配位键，从而获得预成型的三维、互连通纳米纤维网络。随后，将聚四氟乙烯（PTFE）颗粒喷涂在纸张表面，然后进行热处理，得到双层 PTFE-P/PNF 纳米复合材料纸。该纳米复合纸具有令人难以置信的拉伸强度（271.6 MPa，提高了 52.9%）、耐折性、超疏水性和自清洁性能。此外，它还具有低介电常数（2.06）和介电损耗角正切（0.0133）值。根据麦克斯韦方程组建立的双层介电体的透波模型，电磁波从纸张两侧入射的透波系数分别为 97.6%（PNF 侧）和 96.0%（PTFE/P(S-co-BCB-co-MMA) 侧）。PTFE-P/PNF 纳米复合材料纸在透波应用领域具有巨大的潜力。
