Lin Tang, Zhiyong Yang, Yusheng Tang*, Junliang Zhang, Jie Kong and Junwei Gu*. Facile functionalization strategy of PBO fibres for synchronous improving the mechanical and wave-transparent properties of the PBO fibres/cyanate ester laminated composites. Composites Part A: Applied Science and Manufacturing, 2021, 150: 106622. 2020IF=7.664.（1区材料科学Top期刊）

（https://doi.org/10.1016/j.compositesa.2021.106622）

Abstract

A copolymer of P(S-co-BCB-co-GMA) synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization was coated on the surface of poly(p-phenylene-2,6-benzobisoxazole) (PBO) fibres, followed by grafting 2, 2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane (AHHFP) to obtain 6F-PBO@P-GMA fibres. The corresponding 6F-PBO@P-GMA fibres/modified cyanate ester wave-transparent laminated composites were then fabricated. The introduction of copolymer membrane and AHHFP reduces interfacial polarization and enhances the interfacial strength of the wave-transparent laminated composites. The corresponding flexural strength and interlaminar shear strength (ILSS) of the 6F-PBO@P-GMA fibres/modified cyanate ester wave-transparent laminated composites are 701.5 and 46.4 MPa, 12.9% and 19.3% higher than those of laminated composites reinforced by pristine PBO fibres, respectively. Meantime, the obtained wave-transparent laminated composites also possess the lowest complex permittivity, and wide high wave-transparent rate area at X-band (|T|² >93.5%, thickness<2.10 mm).

通过可逆加成-断裂链转移(RAFT) 聚合合成的P(S-co-BCB-co-GMA) 共聚物涂覆在聚对苯撑苯并二噁唑（PBO）纤维表面，进而接枝2,2-双（3-氨基-4-羟基苯基）六氟丙烷（AHHFP）得到6F-PBO@P-GMA纤维，再经高温模压制备6F-PBO@P-GMA纤维/改性氰酸酯树脂层压透波复合材料。共聚物膜和AHHFP的同步引入降低了层压透波复合材料的界面极化并增强其界面强度。6F-PBO@P-GMA纤维/改性氰酸酯树脂层压透波复合材料的弯曲强度和层间剪切强度（ILSS）分别为701.5和46.4 MPa，比纯PBO纤维/改性氰酸酯树脂层压透波复合材料的弯曲强度（621.5 MPa）和ILSS（38.9 MPa）分别提高了12.9%和19.3%。低于2.1 mm厚的6F-PBO@P-GMA纤维/改性氰酸酯层压透波复合材料在X波段展示出高的透波率（|T|²>93.5%）。