Zheng Liu#, Junliang Zhang#, Yusheng Tang*, Jianbo Xu, Hao Ma, Jie Kong and Junwei Gu*. Optimization of PBO fibers/cyanate ester wave-transparent laminated composites via incorporation of a fluoride-containing linear interfacial compatibilizer. Composites Science and Technology, 2021, 210: 108838. 2019IF=7.094.（1区材料科学Top期刊）

https://doi.org/10.1016/j.compscitech.2021.108838

中英文摘要：Bisphenol A dicyanate ester (BADCy) was utilized as the matrix, poly (p-phenylene-2, 6-benzobisoxazole) (PBO) fibers as the reinforcement, and synthesized fluorine-containing linear PBO precursor (preFLPBO) as the interfacial compatibilizer to prepare PBO fibers/FLPBO-m-BADCy wave-transparent laminated composites. The fluorine groups and PBO-like structures could respectively improve the dielectric properties of BADCy matrix and the interfacial compatibility between the BADCy matrix and PBO fibers. Additionally, the partly interpenetrating network formed between preFLPBO and BADCy could significantly improve the mechanical properties. PBO fibers/FLPBO-m-BADCy wave-transparent laminated composites with 7 wt% preFLPBO displayed the optimal comprehensive performances. Dielectric constant (ε) and dielectric loss (tanδ) were respectively 2.90 and 0.0042, and the corresponding theoretical wave-transmittance (|T|²) at 1 MHz was 93.3%, higher than that of PBO fibers/BADCy wave-transparent laminated composites. The minimum percentage of simulated electromagnetic wave-transparent energy (E_{T (simulation)}) of the PBO fibers/FLPBO-m-BADCy (1 mm) wave-transparent laminated composites at 0.3~40 GHz was 87.3%, also better than PBO fibers/BADCy wave-transparent laminated composites (85.9%). The flexural and interlaminar shear strength (ILSS) of PBO fibers/FLPBO-m-BADCy wave-transparent laminated composites were increased from 587.4 and 36.7 MPa to 628.0 and 44.8 MPa, respectively. In addition, the corresponding volume resistivity and breakdown voltage were 2.7×10¹⁵ Ω?cm and 19.12 kV/mm, respectively.

以双酚A氰酸酯树脂（BADCy）为基体，聚对苯撑苯并二噁唑（PBO）纤维为增强体，以2, 2-双（3-氨基-4-羟基苯基）六氟丙烷（6FAP）和对苯二甲酰氯（TPC）缩聚制备而成的含氟线性PBO前驱体（preFLPBO）为界面相容剂，高温模压制备PBO fibers/FLPBO-m-BADCy层压透波复合材料。其中preFLPBO分子中的含氟基团能够改善BADCy树脂的介电性能；类PBO结构能够提升基体-纤维之间的界面相容性；preFLPBO与BADCy树脂之间能够形成局部分子链互穿网络显著提升其力学性能。结果表明，当preFLPBO质量分数为7 wt%时，PBO fibers/FLPBO-m-BADCy层压透波复合材料具有最佳的综合性能。1 MHz下的介电常数（ε）和介电损耗正切值（tanδ）值分别为2.90和0.0042，对应的理论透波率（|T|²）为93.3%；均优于对应频率下PBO fibers/BADCy层压透波复合材料（ε、tanδ和对应的|T|²分别为3.06、0.006和92.5%）；当厚度为1 mm时，0.3~40 GHz范围内PBO fibers/FLPBO-m-BADCy层压透波复合材料的仿真电磁波透过能量百分率（E_{T(simulation)}）最小值为87.3%，也优于PBO fibers/BADCy层压透波复合材料（85.9%）。此时PBO fibers/FLPBO-m-BADCy层压透波复合材料的弯曲强度和层间剪切强度（ILSS）从PBO fibers/BADCy层压透波复合材料的587.4 MPa和36.7 MPa分别提升至628.0 MPa和44.8 MPa；对应的体积电阻率和击穿电压分别为2.7×10¹⁵ Ω?cm和19.12 kV/mm。