Zheng Liu, Xiaoli Fan, Muyi Han, Hao Li, Junliang Zhang, Lixin Chen, Qiju Zhu* and Junwei Gu*. Branched fluorine/adamantane interfacial compatibilizer for PBO fibers/cyanate ester wave-transparent laminated composites. Chinese Journal of Chemistry, 2023, 41, 939-950. 2021IF=5.56.
http://doi.org/10.1002/cjoc.202200749
Abstract
Branched fluorine/adamantane PBO precursor (preFABPBO), synthesized via random co-condensation between 2,2-bis(3-amino-4-hydroxyphenyl) hexafluoro propane, 1,3-adamantanedicarbonyl dichloride, and trimesoyl chloride, is performed as interfacial compatibilizer, bisphenol A dicyanate ester (BADCy) resin as polymer matrix, and poly(p-phenylene-2,6-benzobisoxazole) (PBO) fibers as reinforcements to prepare PBO fibers/FABPBO/BADCy wave-transparent laminated composites by high temperature molding. The mechanical properties, wave-transparent performances, and heat resistances of PBO fibers/BADCy composites are simultaneously improved by the addition of preFABPBO. The interlaminar shear strength (ILSS) and flexural strength of PBO fibers/FABPBO/BADCy composites are 48.9 and 665.3 MPa, respectively, increased by 33.2% and 13.3% compared to those of PBO fibers/BADCy composites (36.7 and 587.4 MPa). The dielectric constant and dielectric loss at 106 Hz are 2.53 and 0.003, respectively, lower than those of PBO fibers/BADCy composites (3.06 and 0.006), and the corresponding wave transmission efficiency is 94.8%, which also presents excellent stability over the wide temperature (25~200oC) and frequency range (103~107 Hz and 8.2~12.4 GHz). Meanwhile, the heat resistance index and glass transition temperature are 229.9oC and 247.5oC, also better than those of PBO fibers/BADCy composites (229.6oC and 247.1oC).
以双酚A型氰酸酯（BADCy）树脂为基体，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、金刚烷二甲酰氯和均苯三甲酰氯无规共缩聚制备得到的含氟金刚烷支化型PBO前驱体（preFABPBO）为界面相容剂，经高温模压制备PBO纤维/FABPBO/BADCy层压透波复合材料。兼具含氟基团、金刚烷单元、类PBO和支化结构preFABPBO界面相容剂的引入同步提升了PBO纤维/BADCy层压复合材料的力学性能、透波性能和耐热性能。PBO纤维/FABPBO/BADCy层压透波复合材料的层间剪切强度（ILSS）和弯曲强度分别为48.9 MPa和665.3 MPa，较PBO纤维/BADCy的36.7 MPa和587.4 MPa分别提升了33.2%和13.3%；其介电常数和介电损耗角正切值分别为2.53和0.003（106 Hz，25oC），均低于PBO纤维/BADCy的3.06和0.006；相应的理论透波率为94.8%，高于PBO纤维/BADCy（92.5%），且在较宽温度（25~200oC）和频率范围内（103~107 Hz和8.2~12.4 GHz）具有优异稳定性。PBO纤维/FABPBO/BADCy层压透波复合材料的体积电阻率、击穿电压、耐热指数和玻璃化转变温度分别为5.17×1015 Ω·cm、27.21 kV/mm、229.9oC和247.5oC，均优于PBO纤维/BADCy的2.2×1015 Ω·cm、17.69 kV/mm、229.6oC和247.1oC。
本文亮点
1. preFABPBO的引入同步提升了PBO纤维/BADCy层压透波复合材料的力学性能、透波性能和耐热性能。
2. PBO纤维/FABPBO/BADCy层压透波复合材料的ILSS和弯曲强度分别为48.9 MPa和665.3 MPa，较PBO纤维/BADCy的36.7 MPa和587.4 MPa分别提升了33.2%和13.3%。
3. PBO纤维/FABPBO/BADCy层压透波复合材料的介电常数和介电损耗角正切值（106 Hz，25oC）分别为2.53和0.003，其理论透波率为94.8%，且在不同温度（25~200oC）和频率范围内（103~107 Hz和8.2~12.4 GHz）均具有优异的稳定性。