碳纳米管改性CF/PEEK复合材料的力学与电磁屏蔽性能

Effect of carbon nanotube reinforcement on the mechanical and EMI shielding properties of CF/PEEK composites

为了制备兼具优异力学性能和电磁干扰屏蔽效能的结构功能一体化耐高温热塑性复合材料,对添加不同组分碳纳米管(CNT)的连续碳纤维增强聚醚醚酮复合材料(CF-CNT/PEEK)的力学性能、电导率以及电磁干扰屏蔽效能(EMI SE)进行了研究。考察用上浆后的CNT (SCNT)作为导电填料制备的SCF-SCNT/PEEK层合板力学性能、界面形貌和屏蔽效能,并与不进行表面修饰、仅活化的CNT (ACNT)的效果做对比实验。结果表明,适量的CNT会使CF/PEEK层合板的力学性能、电导率和EMI SE得到提高;SCNT比ACNT更容易在PEEK中均匀分散,且与SCF和PEEK的结合更好。所有样品中,仅添加1wt%SCNT的SCF-SCNT/PEEK层合板与不添加CNT的层合板相比,拉伸强度提高了20.8%,达到778 MPa;弯曲强度提高了25.9%,达到1 684 MPa;电导率提升5倍,达到0.15 S/cm;电磁干扰屏蔽效能提升69.76%,平均值达到34.97 dB。

In order to prepare a high temperature resistant thermoplastic composite material with integrated structure and function, which has excellent mechanical properties and electromagnetic interference shielding effectiveness at the same time, the mechanical properties, electrical conductivity and electromagnetic interference shielding effectiveness(EMI SE) of continuous carbon fiber reinforced polyether ether ketone composites(CFCNT/PEEK) with different components of carbon nanotubes(CNT) were studied. The mechanical properties, interface morphology and shielding effectiveness of SCF-SCNT/PEEK laminates prepared with CNT modified PEEK sizing agent(SCNT) as conductive fillers were investigated, and the effect of the CNT(ACNT) without surface modification and only activation comparative experiment were compared. The results show that an appropriate amount of CNT will improve the mechanical properties, electrical conductivity and shielding effectiveness of the CF/PEEK laminate. SCNT is easier to uniformly disperse in PEEK than ACNT, and has a better combination with SCF and PEEK. In all samples, the tensile strength of SCF-SCNT/PEEK laminates with only 1wt%SCNT increased by 20.8% to778 MPa compared with laminates without CNTs. Bending strength is increased by 25.9% to 1 684 MPa. The conductivity is increased by 5 times, reaching 0.15 S/cm. The electromagnetic interference shielding efficiency is increased by 69.76%, with an average value of 34.97 dB.