Optimization of PBO fibers/cyanate ester wave-transparent laminated composites via incorporation of a fluoride-containing linear interfacial compatibilizer
Optimization of PBO fibers/cyanate ester wave-transparent laminated composites via incorporation of a fluoride-containing linear interfacial compatibilizer
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DOI：
10.1016/j.compscitech.2021.108838
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发表时间：
2021-07
影响因子：
9.1
通讯作者：
Zheng Liu;Junliang Zhang;Yusheng Tang;Jianbo Xu;Haoyuan Ma;Jie Kong;Junwei Gu
中科院分区：
文献类型：
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作者：
Zheng Liu;Junliang Zhang;Yusheng Tang;Jianbo Xu;Haoyuan Ma;Jie Kong;Junwei Gu
以双酚A二氰酸酯（BADCy）为基体，聚对苯撑-2，6-苯并二恶唑（PBO）纤维为增强体，合成了含氟线型PBO前体（preFLPBO）作为界面相容剂，制备了PBO纤维/FLPBO-m-BADCy透波层状复合材料。含氟基团和PBO类结构分别改善了BADCy基体的介电性能和BADCy基体与PBO纤维的界面相容性。此外，preFLPBO与BADCy之间形成的部分互穿网络结构可显著提高材料的力学性能。当preFLPBO质量分数为7%时，PBO纤维/FLPBO-m-BADCy透波层状复合材料的综合性能最佳。介电常数ε和介电损耗tan δ分别为2.90和0.0042，相应的理论透波率（|不|2）在1 MHz时的透波率为93.3%，高于PBO纤维/BADCy透波层压复合材料的透波率。PBO纤维/FLPBO-m-BADCy（1 mm）透波层合复合材料在0.3~40 GHz的模拟透波能量（ET（simulation））最小百分比为87.3%，也优于PBO纤维/BADCy透波层合复合材料（85.9%）。PBO纤维/FLPBO-m-BADCy透波层状复合材料的弯曲强度和层间剪切强度分别从587.4和36.7 MPa提高到628.0和44.8 MPa。cm，击穿电压为19.12kV/mm。
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 betweenpreFLPBO 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 (ET (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 × 1015Ω·cm and 19.12 kV/mm, respectively.