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).
以雙酚A型氰酸酯（BADCy）樹脂為基體，聚對苯撐苯并二噁唑（PBO）纖維為增強體，以2, 2-雙（3-氨基-4-羥基苯基）六氟丙烷、金剛烷二甲酰氯和均苯三甲酰氯無規共縮聚制備得到的含氟金剛烷支化型PBO前驅體（preFABPBO）為界面相容劑，經高溫模壓制備PBO纖維/FABPBO/BADCy層壓透波復合材料。兼具含氟基團、金剛烷單元、類PBO和支化結構preFABPBO界面相容劑的引入同步提升了PBO纖維/BADCy層壓復合材料的力學性能、透波性能和耐熱性能。PBO纖維/FABPBO/BADCy層壓透波復合材料的層間剪切強度（ILSS）和彎曲強度分別為48.9 MPa和665.3 MPa，較PBO纖維/BADCy的36.7 MPa和587.4 MPa分別提升了33.2%和13.3%；其介電常數和介電損耗角正切值分別為2.53和0.003（106 Hz，25oC），均低于PBO纖維/BADCy的3.06和0.006；相應的理論透波率為94.8%，高于PBO纖維/BADCy（92.5%），且在較寬溫度（25~200oC）和頻率范圍內（103~107 Hz和8.2~12.4 GHz）具有優異穩定性。PBO纖維/FABPBO/BADCy層壓透波復合材料的體積電阻率、擊穿電壓、耐熱指數和玻璃化轉變溫度分別為5.17×1015 Ω·cm、27.21 kV/mm、229.9oC和247.5oC，均優于PBO纖維/BADCy的2.2×1015 Ω·cm、17.69 kV/mm、229.6oC和247.1oC。
本文亮點
1. preFABPBO的引入同步提升了PBO纖維/BADCy層壓透波復合材料的力學性能、透波性能和耐熱性能。
2. PBO纖維/FABPBO/BADCy層壓透波復合材料的ILSS和彎曲強度分別為48.9 MPa和665.3 MPa，較PBO纖維/BADCy的36.7 MPa和587.4 MPa分別提升了33.2%和13.3%。
3. PBO纖維/FABPBO/BADCy層壓透波復合材料的介電常數和介電損耗角正切值（106 Hz，25oC）分別為2.53和0.003，其理論透波率為94.8%，且在不同溫度（25~200oC）和頻率范圍內（103~107 Hz和8.2~12.4 GHz）均具有優異的穩定性。