为了研究不同浓度碳纳米管含量的多壁碳纳米管/聚醚酰亚胺(MWCNTs/PEI)杂化纳米纤维膜对于液体成型环氧树脂碳纤维复合材料的影响,本文制备了液体成型环氧树脂碳纤维复合材料进行实验。通过静电纺丝法制备碳纳米管/聚醚酰亚胺杂化纳米纤维膜,系统研究碳纳米管含量对碳纤维/环氧树脂复合材料层间韧性和面内力学性能的影响,并分析性能与层间多级微观结构的关联机制。研究发现,适应VARI工艺的碳纳米管/聚醚酰亚胺杂化纳米纤维膜使复合材料I型层间断裂韧性得到改善。这可能与碳纳米管/聚醚酰亚胺杂化纳米纤维膜中聚醚酰亚胺通过原位溶解和固化诱导相分离在层间区域形成PEI相分离微球以及碳纳米管的起到钉扎,锚固效应和裂纹尖端分叉机制吸收更多的能量的作用,同时提高层间裂纹扩展阻力和改善层间树脂基体载荷转移能力的作用有关。
In order to study the effect of multi-walled carbon nanotube/polyetherimide (MWCNTs/PEI) hybrid nanofiber membranes with different concentrations of carbon nanotubes on liquid-formed epoxy resin carbon fiber composites,liquid-formed epoxy resin carbon fiber composites were prepared for experiments in this paper.The carbon nanotube/polyetherimide hybrid nanofiber membranes were prepared by electrostatic spinning method,and the effect of carbon nanotube content on the interlayer toughness and in-plane mechanical properties of carbon fiber/epoxy composites was systematically investigated,and the correlation mechanism between the properties and the interlayer multi-level microstructure was analyzed.It was found that the carbon nanotube/polyetherimide hybrid nanofiber membranes prepared by the VARI process resulted in an improved type I interlaminar fracture toughness of the composites.This may be related to the role of the polyetherimide in the carbon nanotube/polyetherimide hybrid nanofiber membrane in forming PEI phase separation microspheres in the interlaminar region through in situ dissolution and curing-induced phase separation as well as the role of the carbon nanotube in acting as a pegging,anchoring effect and crack tip bifurcation mechanism to absorb more energy,simultaneously increasing the interlaminar crack extension resistance and improving the load transfer capability of the interlaminar resin matrix.
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基金资助
上海市科委“科技创新行动计划”高新技术领域项目(18DZ1100800,20511107100)
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