Zheng Liu, Xiaoli Fan, Muyi Han, Junliang Zhang, Lixin Chen*, Yusheng Tang, Jie Kong and Junwei Gu*. Significantly improved interfacial properties and wave-transparent performance of PBO fibers/cyanate esterslaminated composites via introducing a polydopamine/ZIF-8 hybrid membrane. Composites Science and Technology, 2022, 223: 109426. 2020IF=8.528.（1區材料科學Top期刊）
https://doi.org/10.1016/j.compscitech.2022.109426
Abstract
Polydopamine hybrid zeolitic imidazolate framework-8 (PDA*ZIF-8) membrane, synthesized by zinc nitrate hexahydrate (ZnNO3?6H2O), 2-methylimidazole (2-MI), and dopamine (DA), uniformly grows on the surface of poly(p-phenylene-2, 6-benzobisoxazole) (PBO) fibers by heterogeneous nucleation method to obtain PBO@PDA*ZIF-8 fibers. PBO@PDA*ZIF-8 fibers are then applied as the reinforcement, bisphenol A dicyanate ester (BADCy) as the matrix, and PBO@PDA*ZIF-8 fibers/BADCy wave-transparent laminated composites are prepared by high-temperature molding. Results indicate that PDA*ZIF-8 membrane increases the surface roughness and chemical activity of PBO fibers. The interlaminar shear strength (ILSS) and flexural strength of PBO@PDA*ZIF-8 fibers/BADCy laminated composites are 45.3 and 656.3 MPa, respectively, which are increased by 23.4% and 11.7% compared with those of PBO fibers/BADCy composites (587.4 and 36.7 MPa). The dielectric constant and dielectric loss values at 1 MHz are 2.76 and 0.0046, respectively, lower than PBO fibers/BADCy (3.06 and 0.006). At 0.3~40 GHz, PBO@PDA*ZIF-8 fibers/BADCy laminated composites have excellent wave-transparent performance (The simulated wave-transparent rate is greater than 87%, d = 1.5~3.5 mm). Meanwhile, the corresponding volume resistivity and breakdown strength are 3.7×1015 Ω?cm and 23.61 kV/mm, higher than PBO fibers/BADCy composites (2.2×1015 Ω?cm and 17.69 kV/mm), respectively.
本文以六水合硝酸鋅（ZnNO3?6H2O）、2-甲基咪唑（2-MI）和多巴胺（DA）為原料，通過異相成核法將聚多巴胺（PDA）雜化沸石咪唑骨架（PDA*ZIF-8）均勻包覆在聚對苯撐苯并二噁唑（PBO）纖維表面（PBO@PDA*ZIF-8），再與雙酚A型氰酸酯（BADCy）樹脂經高溫模壓制備PBO@PDA*ZIF-8纖維/BADCy層壓透波復合材料。結果表明，PDA*ZIF-8膜增加了PBO纖維的表面粗糙度和化學活性。PBO@PDA*ZIF-8纖維/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45.3 MPa和656.3 MPa，較PBO纖維/BADCy（ILSS和彎曲強度分別為36.7 MPa和587.4 MPa）分別提高了23.4%和11.7%。1 MHz下的介電常數和介電損耗角正切值分別為2.76和0.0046，均低于PBO纖維/BADCy（3.06和0.006）；0.3~40 GHz下PBO@PDA*ZIF-8纖維/BADCy層壓透波復合材料具有優異的透波性能（仿真透波率大于87%，d = 1.5~3.5 mm）。此外，PBO@PDA*ZIF-8纖維/BADCy層壓透波復合材料的體積電阻率、擊穿電壓分別為3.7×1015 Ω?cm和23.61 kV/mm，同樣優于PBO纖維/BADCy的2.2×1015 Ω?cm和17.69 kV/mm。
論文創新點
1. 采用聚多巴胺雜化沸石咪唑框架（PDA*ZIF-8）膜均勻包覆的PBO（PBO@PDA*ZIF-8）纖維較純PBO纖維的表面能提升了425.4%，其表面粗糙度也從15 nm增加到71 nm。
2. PBO@PDA*ZIF-8纖維/BADCy層壓透波復合材料的層間剪切強度（ILSS）和彎曲強度分別從PBO纖維/BADCy的36.7 MPa和587.4 MPa提升至45.3 MPa和656.3 MPa。
3. 1 MHz下，PBO@PDA*ZIF-8纖維/BADCy層壓透波復合材料的介電常數和介電損耗角正切值分別為2.76和0.0046，分別低于PBO纖維/BADCy的3.06和0.0060。