Improving the comprehensive properties of PBO fibres/cyanate ester composites using a hyperbranched fluorine and epoxy containing PBO precursor
Improving the comprehensive properties of PBO fibres/cyanate ester composites using a hyperbranched fluorine and epoxy containing PBO precursor
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DOI：
10.1016/j.compositesa.2021.106596
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发表时间：
2021-11
影响因子：
8.7
通讯作者：
Zheng Liu;Xiaoli Fan;Junliang Zhang;Zhiyong Yang;Yusheng Tang;Jianwei Li;Jie Kong;Junwei Gu-
中科院分区：
文献类型：
--
作者：
Zheng Liu;Xiaoli Fan;Junliang Zhang;Zhiyong Yang;Yusheng Tang;Jianwei Li;Jie Kong;Junwei Gu-
合成了超支化含氟环氧PBO前驱体(环氧-preFHBPBO)，并将其作为界面相容剂，同步改善了聚对苯基-2，6-苯并双恶唑(PBO)纤维增强双酚A二氰酸酯(BADCy)树脂(PBO纤维/FHBO-co-BADCy)层状复合材料的力学性能和介电性能。超支化结构和含氟基团的引入显著提高了聚合物的力学性能和透波性能。与PbO纤维/BADCy相比，含7%环氧树脂的PbO纤维/FHBPbO-co-BADCy复合材料的弯曲强度和层间剪切强度分别提高了634.9和46.9h Mpa，分别提高了8.1%和27.8%。相应的介电常数和介电损耗分别为2.65和0.003，低于PbO纤维/BADCy复合材料的介电常数和介电损耗(分别为3.06和0.006)。相应的体积电阻率和击穿强度分别为4.93kV×1015Ω·cm和25.38kV/mm，高于PbO纤维/BADCy树脂复合材料的2.2kV×11015Ω·cm和17.69kV/mm。
Hyperbranched fluorine and epoxy containing PBO precursor (epoxy-preFHBPBO) was synthesized and utilized as interface compatibilizer to synchronously improve the mechanical and dielectric properties of poly(p-phenylene-2, 6-benzobisoxazole) (PBO) fibres reinforced bisphenol A dicyanate ester (BADCy) resins (PBO fibres/FHBPBO-co-BADCy) laminated composites.1H NMR,13C NMR, and FTIR analyses confirmed the successful preparation of epoxy-preFHBPBO. The introduction of hyperbranched structure and fluorine groups significantly improved the mechanical properties and wave-transparent performance. Compared with PBO fibres/BADCy, the flexural strength and interlaminar shear strength of PBO fibres/FHBPBO-co-BADCy composites with 7 wt% epoxy-preFHBPBO were respectively enhanced to 634.9 and 46.9 MPa, increased by 8.1% and 27.8%. The corresponding dielectric constant and dielectric loss were 2.65 and 0.003, respectively, lower than those of PBO fibres/BADCy (3.06 and 0.006) composites. Meanwhile, the corresponding volume resistivity and breakdown strength were 4.93 × 1015Ω•cm and 25.38 kV/mm, higher than PBO fibres/BADCy resins composites (2.2 × 1015Ω•cm and 17.69 kV/mm).