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(qiáng)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(guī)共縮聚制備得到的含氟金剛烷支化型PBO前驅(qū)體（preFABPBO）為界面相容劑，經(jīng)高溫模壓制備PBO纖維/FABPBO/BADCy層壓透波復(fù)合材料。兼具含氟基團(tuán)、金剛烷單元、類PBO和支化結(jié)構(gòu)preFABPBO界面相容劑的引入同步提升了PBO纖維/BADCy層壓復(fù)合材料的力學(xué)性能、透波性能和耐熱性能。PBO纖維/FABPBO/BADCy層壓透波復(fù)合材料的層間剪切強(qiáng)度（ILSS）和彎曲強(qiáng)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(shù)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(yīng)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(nèi)（103~107 Hz和8.2~12.4 GHz）具有優(yōu)異穩(wěn)定性。PBO纖維/FABPBO/BADCy層壓透波復(fù)合材料的體積電阻率、擊穿電壓、耐熱指數(shù)和玻璃化轉(zhuǎn)變溫度分別為5.17×1015 Ω·cm、27.21 kV/mm、229.9oC和247.5oC，均優(yōu)于PBO纖維/BADCy的2.2×1015 Ω·cm、17.69 kV/mm、229.6oC和247.1oC。
本文亮點(diǎn)
1. preFABPBO的引入同步提升了PBO纖維/BADCy層壓透波復(fù)合材料的力學(xué)性能、透波性能和耐熱性能。
2. PBO纖維/FABPBO/BADCy層壓透波復(fù)合材料的ILSS和彎曲強(qiáng)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(fù)合材料的介電常數(shù)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(nèi)（103~107 Hz和8.2~12.4 GHz）均具有優(yōu)異的穩(wěn)定性。