基于插层法协同提升碳纤维树脂基复合材料的导电性能与层间韧性  

Synergistic improvement of electrical conductivity and interlaminar toughness of carbon fiber resin matrix composites based on intercalation method

作　　者：向东 刘家良 赵春霞[1] 李辉[1] 王斌[1] 李云涛[1] XIANG Dong;LIU Jialiang;ZHAO Chunxia;LI Hui;WANG Bing;LI Yuntao(School of New Energy and Materials,Southwest Petroleum University,Chengdu 610500,China)

机构地区：[1]西南石油大学新能源与材料学院,成都610500

出　　处：《复合材料学报》2022年第1期134-146,共13页Acta Materiae Compositae Sinica

基　　金：四川省国际合作项目(2021YFH0031)。

摘　　要：碳纤维增强树脂基复合材料(CFRP)因其低密度、高比强度等特点,在航空航天领域得到了广泛的应用,但其导电性和层间韧性的不足降低了CFRP作为飞机结构件的使用安全性。为了改善CFRP弱的导电性和层间断裂韧性,本文采用溶液浇铸法制备了多壁碳纳米管(MWCNTs)和石墨烯纳米片(GNPs)掺杂聚醚砜(PES)的导电热塑性薄膜(CTFs)。然后将CTFs交错放入碳纤维/环氧树脂(CF/EP)预浸料中制得复合材料层压板,并对其导电性和层间断裂韧性进行了探究。结果表明,相较于对照样品(CS),在横向(Y)和厚度(Z)方向,层压板的电导率分别提高了474%和554%。采用双悬臂梁(DCB)和端口弯曲(ENF)法评估了ModeⅠ和ModeⅡ层间断裂韧性,当插入的CTF中纳米填料质量比为CNT∶GNP=2∶1时,复合材料层压板的ModeⅠ层间断裂韧性(G;)和断裂阻抗(G;)分别提高了441%和165%,此外,纳米填料质量比CNT∶GNP=8∶1时,ModeⅡ层间断裂韧性(G;)提高了79%。最后通过SEM观察了复合材料的微观结构形貌,并分析了复合材料的失效机制。Carbon fiber reinforced resin matrix composites(CFRP)are widely used in aerospace and is gradually replacing metal materials for aircraft structures as a result of their low density and high strength characteristics,while poor electrical conductivity and interlaminar shear fracture toughness could reduce their safety as structural components in use.Ⅰn order to improve the poor electrical conductivity and interlaminar fracture toughness of CFRP,multi-walled carbon nanotubes(MWCNTs)and graphene nanoplatelets(GNPs)doped polyethersulfone(PES)conductive thermoplastic films(CTFs)were prepared by solution casting in this work.Then CTFs were interleaved into carbon fiber/epoxy resin(CF/EP)prepregs to prepare composite laminates.The electrical conductivity and interlaminar fracture toughness of the composite laminates were investigated.The results show that compared with the control sample(CS),the conductivity of the laminate increases by 474%and 554%in the transverse(Y)and thickness(Z)directions,respectively.The ModeⅠand ModeⅡinterlaminar fracture toughness values were evaluated by double cantilever beam(DCB)and end-notched flexure(ENF)testing.The data show that when the nano-filler mass ratio of CNT∶GNP is 2∶1 in the interleaved CTF,the ModeⅠinterlaminar fracture toughness and fracture impedance of the composite laminates are increased by 441%and 165%,respectively.Moreover,when the nano-filler mass ratio of CNT∶GNP is 8:1,the ModeⅡinterlaminar fracture toughness of the composite laminates is increased by 79%.Ⅰn addition,the microstructural morphology of the composite material was observed by SEM and its failure mechanism was studied.

关 键 词：碳纤维/环氧树脂(CF/EP)复合材料 聚醚砜(PES) 协同效应 电导率 层间断裂韧性 

分 类 号：TB332[一般工业技术—材料科学与工程]