Lin Tang, Junliang Zhang, Chunliang Wu, Yusheng Tang*, Hao Ma, Jie Kong and Junwei Gu*. UV etched random copolymer membrane coated PBO fibers/cyanate ester wave-trasnparent laminated composites. Composites Part B-Engineering, 2021, 212: 108680. 2019IF=7.635.（1区材料科学Top期刊）

(https://doi.org/10.1016/j.compositesb.2021.108680)

AbstractPoly(p-phenylene-2,6-benzobisoxazole) fibers treated by random copolymer P(S-co-BCB-co-MMA) membrane and UV etching (UV-PBO@P fibers) are performed as reinforcement, bisphenol AF/amantadine modified bisphenol A cyanate ester (AEAF-co-BADCy) resin as polymeric matrix, and the UV-PBO@P fibers/AEAF-co-BADCy wave-transparent laminated composites were then fabricated. When the P(S-co-BCB-co-MMA) membrane thickness is 62.3 nm and the UV etching time is 96 hrs, UV-PBO@P fibers display the best interfacial compatibility with AEAF-co-BADCy resin, and the corresponding wave-transparent laminated composites present the optimal comprehensive performance. Interlaminar shear strength (ILSS) and flexural strength are 50.2 and 745.6 MPa, 27.4% and 21.6% higher than those (ILSS of 39.4 MPa, flexural strength of 613.3 MPa) of pristine PBO fibers/AEAF-co-BADCy wave-transparent laminated composites, respectively. And the composites possess low complex permittivity and tanδ, corresponding |T|² in the X band is 88.9~94.2%. High-frequency structural simulation (HFSS) results demonstrate that the radome from the composites displays high |T|² of 89.1~93.1% in the X-band, close to the theoretical calculation value. This work provides a certain theoretical guidance for fabricating lightweight, high strength, and high |T|² polymer matrix wave-transparent composites, and further broadens the application of PBO fibers and cyanate ester resins in aviation/aerospace, 5G communication services, electronic information, and other fields.

以无规共聚物P(S-co-BCB-co-MMA)膜和紫外刻蚀协同处理的聚对苯撑苯并二噁唑（PBO）纤维为增强体，双酚AF/金刚烷改性的双酚A氰酸酯（AEAF-co-BADCy）树脂为透波基体，经“浸渍-缠绕-铺层-模压”法制备UV-PBO@P纤维/AEAF-co-BADCy树脂层压复合材料。结果表明，当PBO纤维表面P(S-co-BCB-co-MMA)（分子量为32300）膜厚度为62.3 nm，且紫外刻蚀时间为96 hrs时，UV96-PBO@P纤维/AEAF-co-BADCy树脂层压复合材料具有最佳的力学性能、透波性能和热性能。UV96-PBO@P纤维/AEAF-co-BADCy树脂层压复合材料的层间剪切强度ILSS和弯曲强度分别为50.2 MPa和745.6 MPa，较纯PBO纤维/AEAF-co-BADCy树脂层压复合材料的ILSS（39.4 MPa）和弯曲强度（613.3 MPa）分别提高了27.4%和21.6%。复介电常数实部（εr''）、虚部（εr''''）和介电损耗角正切值（tanδ）分别为2.63、0.015和0.0057（10 GHz），且在X波段对应的透波率为88.9~94.2%，明显高于纯PBO纤维/AEAF-co-BADCy树脂层压复合材料对应波段的透波率（83.4~90.8%）；高频结构仿真（HFSS）模拟结果表明UV96-PBO@P纤维/AEAF-co-BADCy树脂层压复合材料天线罩在整个X波段的透波率为89.1~93.1%，与理论计算的结果相近。同时，UV96-PBO@P纤维/AEAF-co-BADCy树脂层压复合材料具有最高的耐热指数（T_HRI，222.0^oC）和玻璃化转变温度（Tg，236.3^oC）。本工作可为制备轻质、高强和高透波的树脂基复合材料提供了一定的理论指导，进一步拓宽PBO纤维和氰酸酯树脂在航空/航天、5G通讯服务、电子信息等领域的应用范围。