[Composites Part B] UV etched random copolymer membrane coated PBO fibers/cyanate ester wave-trasnparent laminated composites
writer：Lin Tang, Junliang Zhang, Chunliang Wu, Yusheng Tang*, Hao Ma, Jie Kong and Junwei Gu*
keywords：polymer-matrix composites
source：期刊
specific source：Composites Part B-Engineering
Issue time：2021年
AbstractPoly(p-phenylene-2,6-benzobisoxazole) fibers treated by random copolymer P(S-co-BCB-co-MMA) membrane and UV etching (UV-PBO@P fibers) are performed as reinforcement, bisphenol AF/amantadine modified bisphenol A cyanate ester (AEAF-co-BADCy) resin as polymeric matrix, and the UV-PBO@P fibers/AEAF-co-BADCy wave-transparent laminated composites were then fabricated. When the P(S-co-BCB-co-MMA) membrane thickness is 62.3 nm and the UV etching time is 96 hrs, UV-PBO@P fibers display the best interfacial compatibility with AEAF-co-BADCy resin, and the corresponding wave-transparent laminated composites present the optimal comprehensive performance. Interlaminar shear strength (ILSS) and flexural strength are 50.2 and 745.6 MPa, 27.4% and 21.6% higher than those (ILSS of 39.4 MPa, flexural strength of 613.3 MPa) of pristine PBO fibers/AEAF-co-BADCy wave-transparent laminated composites, respectively. And the composites possess low complex permittivity and tanδ, corresponding |T|2 in the X band is 88.9~94.2%. High-frequency structural simulation (HFSS) results demonstrate that the radome from the composites displays high |T|2 of 89.1~93.1% in the X-band, close to the theoretical calculation value. This work provides a certain theoretical guidance for fabricating lightweight, high strength, and high |T|2 polymer matrix wave-transparent composites, and further broadens the application of PBO fibers and cyanate ester resins in aviation/aerospace, 5G communication services, electronic information, and other fields.
以無規共聚物P(S-co-BCB-co-MMA)膜和紫外刻蝕協同處理的聚對苯撐苯并二噁唑（PBO）纖維為增強體，雙酚AF/金剛烷改性的雙酚A氰酸酯（AEAF-co-BADCy）樹脂為透波基體，經“浸漬-纏繞-鋪層-模壓”法制備UV-PBO@P纖維/AEAF-co-BADCy樹脂層壓復合材料。結果表明，當PBO纖維表面P(S-co-BCB-co-MMA)（分子量為32300）膜厚度為62.3 nm，且紫外刻蝕時間為96 hrs時，UV96-PBO@P纖維/AEAF-co-BADCy樹脂層壓復合材料具有最佳的力學性能、透波性能和熱性能。UV96-PBO@P纖維/AEAF-co-BADCy樹脂層壓復合材料的層間剪切強度ILSS和彎曲強度分別為50.2 MPa和745.6 MPa，較純PBO纖維/AEAF-co-BADCy樹脂層壓復合材料的ILSS（39.4 MPa）和彎曲強度（613.3 MPa）分別提高了27.4%和21.6%。復介電常數實部（εr''''）、虛部（εr''''''''）和介電損耗角正切值（tanδ）分別為2.63、0.015和0.0057（10 GHz），且在X波段對應的透波率為88.9~94.2%，明顯高于純PBO纖維/AEAF-co-BADCy樹脂層壓復合材料對應波段的透波率（83.4~90.8%）；高頻結構仿真（HFSS）模擬結果表明UV96-PBO@P纖維/AEAF-co-BADCy樹脂層壓復合材料天線罩在整個X波段的透波率為89.1~93.1%，與理論計算的結果相近。同時，UV96-PBO@P纖維/AEAF-co-BADCy樹脂層壓復合材料具有最高的耐熱指數（THRI，222.0oC）和玻璃化轉變溫度（Tg，236.3oC）。本工作可為制備輕質、高強和高透波的樹脂基復合材料提供了一定的理論指導，進一步拓寬PBO纖維和氰酸酯樹脂在航空/航天、5G通訊服務、電子信息等領域的應用范圍。