【摘要】 聚对苯撑苯并二噁唑纳米透波复合纸在航空/航天、交通运输和5G通讯等领域具有广阔的应用前景.然而,透波复合纸内的聚对苯撑苯并二噁唑纳米纤维(PNF)间的相互作用力较低,且表面疏水性较差使其难以服役暴雨、冰雪、盐雾等恶劣自然环境.基于此,本文通过引入铁离子在PNF间构建金属配位键,并采用溶胶-凝胶薄膜转化法制备高强度聚对苯撑苯并二噁唑纳米透波复合纸,再将聚四氟乙烯(PTFE)颗粒喷涂到表面,经热处理得到双层结构的PTFE-P/PNF纳米透波复合纸.基于金属配位键的作用以及PTFE颗粒的引入, PTFE-P/PNF纳米透波复合纸具有卓越的拉伸强度(271.6 MPa)、优异的超疏水(与水的接触角为151o)和自清洁性能.此时,PTFE-P/PNF纳米透波复合具有出色的透波性能,当电磁波从透波复合纸两侧入射时,其透波率均>95%.这种兼具高强度、超疏水和自清洁的透波复合纸在雷达天线罩、电磁窗等领域有着巨大的应用潜能.更多还原

【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 doublelayered 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-coMMA) side), respectively. The PTFE-P/PNF nanocomposite paper possesses great potential in the fields of wave-transparent applications.更多还原