摘要
碳纤维增强聚醚醚酮(CF/PEEK)复合材料正由单一力学结构材料向兼具电磁屏蔽性能的功能一体化材料发展。然而,碳纤维(CF)和聚醚醚酮(PEEK)界面结合差、电磁屏蔽填料在树脂基体中易团聚的问题限制了CF/PEEK复合材料的力学性能和电磁屏蔽性能。通过制备含醚酮结构的聚酰亚胺(PI)和多壁碳纳米管(MWCNT)的复合上浆剂,对CF表面改性,成功获得了力学与电磁屏蔽性能并优的CF/PEEK复合材料。研究发现,当复合上浆剂中MWCNT的质量分数为0.075%时,CF/PEEK复合材料的层间剪切强度(ILSS)、弯曲强度和弯曲模量分别为79 MPa、994 MPa和62 GPa,较未改性前分别提高38.6%、33.6%和17.0%。这得益于PI与PEEK之间的π-π相互作用,以及引入MWCNT提升CF表面粗糙度所带来的界面铆接效应。此外,改性后CF的电导率为180 S/cm,CF/PEEK复合材料在X波段的平均电磁屏蔽效能(EMI)达到42.6 dB,较未改性前分别提升59.3%和65.8%。这主要归因于CF和MWCNT构建的导电网络能够强反射电磁波并实现欧姆损耗。采用PI/MWCNT上浆剂处理CF表面,为开发高性能的CF/PEEK复合材料提供了简便有效的方法,具有广阔的应用前景。
Carbon fiber reinforced polyether ether ketone(CF/PEEK)composites have gradually developed from pure structural material to multifunctional ones,combing mechanical strength with electromagnetic shielding capabilities.However,challenges persist due to the weak interfacial bonding between carbon fibers(CF)and polyether ether ketone(PEEK),as well as the tendency of electromagnetic shielding fillers into the resin matrix,limiting the composites’overall performance.In this study,we modify the surface of CF using a compound sizing agent composed of polyimide(PI)with an ether ketone structure and multi-walled carbon nanotubes(MWCNT).This modification enhances both the mechanical and electromagnetic shielding properties of the resulting CF/PEEK composites.The research reveals that when the MWCNT mass fraction in the sizing agent reaches 0.075%,the CF/PEEK composite exhibits remarkable performance.Specifically,its interlaminar shear strength(ILSS),flexural strength,and flexural modulus increase to 79 MPa,994 MPa,and 62 GPa,respectively,representing significant improvements of 38.6%,33.6%,and 17.0%over the unmodified material.These improvements are attributed to the strongπ-πinteraction between PI and PEEK,as well as the enhanced interfacial bonding resulting from the increased surface roughness of CF due to the presence of MWCNT.Furthermore,the modified CF exhibits a conductivity of 180 S/cm,and the CF/PEEK composite demonstrates an average electromagnetic shielding efficiency(EMI)of 42.6 dB in the X-band,representing substantial increases of 59.3%and 65.8%,respectively,compared to the unmodified material.This enhanced electromagnetic shielding performance can be attributed to the formation of a conductive network by CF and MWCNT,which effectively reflects electromagnetic waves and dissipates them through ohmic losses.Overall,the use of the PI/MWCNT sizing agent for CF surface modification offers a straightforward and effective method for developing CF/PEEK composites with superior mechanical and electromagnetic shielding properties,holding promise for a wide range of applications.
作者
何艺
杨雪勤
任宏亮
阳泽濠
袁婷
范翊
蒋民强
刘勇
张辉
俞建勇
HE Yi;YANG Xueqin;REN Hongliang;YANG Zehao;YUAN Ting;FAN Yi;JIANG Minqiang;LIU Yong;ZHANG Hui;YU Jianyong(College of Textiles,Donghua University,Shanghai,China;Center for Civil Aviation Composites,Donghua University,Shanghai,China)
出处
《东华大学学报(自然科学版)》
北大核心
2025年第1期103-112,共10页
Journal of Donghua University(Natural Science)
基金
上海市科委“科技创新行动计划”项目子课题(22511102402)
上海市产业协同创新(科技)项目(XTCX-KJ-2023-2-14)。
关键词
碳纤维复合材料
聚醚醚酮
界面改性
电磁屏蔽
力学性能
carbon fiber composite
polyether ether ketone
interface modification
electromagnetic interference shielding effectiveness
mechanical property
作者简介
通信作者:张辉,男,研究员,研究方向为碳纤维增强树脂基复合材料,E-mail:zhanghui@dhu.edu.cn。
