MFC增强碳纳米纸的制备及其电磁屏蔽效能

为提高碳纳米纸(BP)力学性能,将微纤化纤维素(MFC)与多壁碳纳米管(MWCNT)混合,采用真空抽滤的方法制备MFC/BP。详细研究了MFC/BP的微观形貌、力学性能、电学性能、电磁屏蔽效能。研究表明,MFC均匀分散在碳纳米管中,形成了纤维骨架,碳纳米管相互穿插缠绕分布在纤维骨架周围形成网状结构。随着MFC含量的增加,MFC/BP的力学性能明显提高。当MFC与MWCNT质量比为1/1时,碳纳米纸的拉伸强度为11.76 MPa,比纯碳纳米纸提升了979%;在8.2~12.4 GHz频段内,碳纳米纸(厚度约55μm)的电磁屏蔽效能为24~30 dB。

Preparation and electromagnetic interference shielding effectiveness of carbon nanotube paper reinforced by microfibrillated cellulose

In order to improve the mechanical property of carbon nanotube paper(BP), microfibrillated cellulose(MFC) was mixed with multi-walled carbon nanotube(MWCNT) to prepare MFC/BP by the method of vacuum filtration. The microstructure, mechanical property, electrical property and electromagnetic interference shielding effectiveness of MFC/BP were studied in detail. The results showed that MFC was uniformly dispersed in carbon nanotube paper to form a fiber skeleton, and carbon nanotubes were intertwined and distributed around the fiber skeleton to form a network structure. With the increase of MFC content, the mechanical properties of MFC/BP were obviously improved. When the mass ratio of MFC to MWCNT was 1:1, the tensile strength was 11.76 MPa, which was 979% higher than the pure carbon nanotube paper. In the band of 8.2-12.4 GHz, the electromagnetic interference shielding effectiveness of MFC/BP(MFC/MWCNT=1/1) with thickness of 55 μm was 24-30 dB.