J. Mater. Sci. Technol. ›› 2023, Vol. 154: 202-209.DOI: 10.1016/j.jmst.2023.01.020

• Research Article • Previous Articles     Next Articles

Simultaneously improving the EMI shielding performances and mechanical properties of CF/PEKK composites via MXene interfacial modification

Xueqin Yanga,b, Jiamei Luoa,b, Hongliang Rena, Yi Xuea, Chenxi Yanga, Ting Yuana, Zehao Yanga, Yong Liua, Hui Zhanga,c,*, Jianyong Yub,c   

  1. aState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China;
    bInnovation Center for Textile Science and Technology, Donghua University, Shanghai 201620, China;
    cShanghai Key Laboratory of Lightweight Structural Composites, Center for Civil Aviation Composites, Donghua University, Shanghai 201620, China
  • Received:2022-12-06 Revised:2023-01-11 Accepted:2023-01-12 Published:2023-08-10 Online:2023-03-11
  • Contact: *State Key Laboratory for Modification of Chemi- cal Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China. E-mail address: zhanghui@dhu.edu.cn (H. Zhang)

Abstract: In this study, two-dimensional MXene (Ti3C2Tx) was employed to modify the interface of carbon fiber-reinforced polyetherketoneketone (CF/PEKK) composites, in order to simultaneously improve the electromagnetic interference (EMI) shielding performances and mechanical properties. The obtained CF/PEKK composites possessed outstanding EMI and mechanical performances, as anticipated. Specifically, the CF/PEKK composites modified with MXene at 1 mg mL-1 exhibited an excellent EMI shielding effectiveness of 65.2 dB in the X-band, a 103.1% enhancement compared with the unmodified CF/PEKK composites. The attractive EMI shielding performances of CF/PEKK composites originated from enhanced ohmic losses and multiple reflections of electromagnetic waves with the help of the MXene and CF layers. In addition, CF/PEKK composites achieved the best mechanical properties by optimizing the dispersion concentration of MXene to 0.1 mg mL-1. The flexural strength, flexural modulus, and interlaminar shear strength of CF/PEKK composites reached 1127 MPa, 81 GPa, and 89 MPa, which were 28.5%, 9.5%, and 29.7% higher than that of the unmodified CF/PEKK composites, respectively. Such improvement in mechanical properties could be ascribed to the comprehensive effect of mechanical interlocking, hydrogen bonds, and Van der Waals forces between the introduced MXene and CF, PEKK, respectively.

Key words: CF/PEKK composites, Ti3C2Tx Mxene, Electromagnetic interference shielding performances Interfacial interactions