[Composites Science and Technology] Optimization of PBO fibers/cyanate ester wave-transparent laminated composites via incorporation of a fluoride-containing linear interfacial compatibilizer
writer：Zheng Liu#, Junliang Zhang#, Yusheng Tang*, Jianbo Xu, Hao Ma, Jie Kong and Junwei Gu*
keywords：Polymer-matrix composites
source：期刊
specific source：Composites Science and Technology
Issue time：2021年
Bisphenol A dicyanate ester (BADCy) was utilized as the matrix, poly (p-phenylene-2, 6-benzobisoxazole) (PBO) fibers as the
reinforcement, and synthesized fluorine-containing linear PBO precursor (preFLPBO)
as the interfacial compatibilizer to prepare PBO fibers/FLPBO-m-BADCy
wave-transparent laminated composites. The fluorine groups and PBO-like
structures could respectively improve the dielectric properties of BADCy matrix
and the interfacial compatibility between the BADCy matrix and PBO fibers.
Additionally, the partly interpenetrating network formed between preFLPBO
and BADCy could significantly improve the mechanical properties. PBO
fibers/FLPBO-m-BADCy wave-transparent laminated composites with 7 wt% preFLPBO
displayed the optimal comprehensive performances. Dielectric constant (ε) and dielectric loss (tanδ) were respectively 2.90
and 0.0042, and the corresponding theoretical wave-transmittance (|T|2) at
1 MHz was 93.3%, higher than that of PBO fibers/BADCy wave-transparent
laminated composites. The minimum percentage of simulated
electromagnetic wave-transparent energy (ET (simulation)) of
the PBO fibers/FLPBO-m-BADCy (1 mm) wave-transparent laminated
composites at 0.3~40 GHz was 87.3%, also
better than PBO fibers/BADCy wave-transparent laminated composites (85.9%). The
flexural and interlaminar shear strength (ILSS) of PBO fibers/FLPBO-m-BADCy
wave-transparent laminated composites were increased from 587.4 and 36.7 MPa to
628.0 and 44.8 MPa, respectively. In addition, the corresponding volume
resistivity and breakdown voltage were 2.7×1015 Ω?cm and 19.12 kV/mm,
respectively.
以雙酚A氰酸酯樹脂（BADCy）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（6FAP）和對苯二甲酰氯（TPC）縮聚制備而成的含氟線性PBO前驅體（preFLPBO）為界面相容劑，高溫模壓制備PBO fibers/FLPBO-m-BADCy層壓透波復合材料。其中preFLPBO分子中的含氟基團能夠改善BADCy樹脂的介電性能；類PBO結構能夠提升基體-纖維之間的界面相容性；preFLPBO與BADCy樹脂之間能夠形成局部分子鏈互穿網絡顯著提升其力學性能。結果表明，當preFLPBO質量分數為7 wt%時，PBO fibers/FLPBO-m-BADCy層壓透波復合材料具有最佳的綜合性能。1 MHz下的介電常數（ε）和介電損耗正切值（tanδ）值分別為2.90和0.0042，對應的理論透波率（|T|2）為93.3%；均優于對應頻率下PBO fibers/BADCy層壓透波復合材料（ε、tanδ和對應的|T|2分別為3.06、0.006和92.5%）；當厚度為1 mm時，0.3~40 GHz范圍內PBO fibers/FLPBO-m-BADCy層壓透波復合材料的仿真電磁波透過能量百分率（ET(simulation)）最小值為87.3%，也優于PBO fibers/BADCy層壓透波復合材料（85.9%）。此時PBO fibers/FLPBO-m-BADCy層壓透波復合材料的彎曲強度和層間剪切強度（ILSS）從PBO fibers/BADCy層壓透波復合材料的587.4 MPa和36.7 MPa分別提升至628.0 MPa和44.8 MPa；對應的體積電阻率和擊穿電壓分別為2.7×1015 Ω?cm和19.12 kV/mm。