G-MWNT/Fe/ABS屏蔽材料的性能和机理研究

Study on properties of G-MWNT/Fe/ABS shielding composite and its shielding mechanism

采用熔融共混法制备G-MWNT(石墨化碳纳米管)/Fe/ABS新型屏蔽复合材料,研究材料的综合性能及其机理,初步探讨了该材料微观结构与性能之间的关系。G-MWNT质量分数为35%~40%时,对复合材料的抗拉强度、拉伸模量、硬度能起到最大增强效果。而随着G-MWNT含量的增加,复合材料的屏蔽效能明显增强,在50 k^1.5 GHz均有良好的屏蔽性能。此外纳米铁粉能显著增强和改善碳纳米管的电磁屏蔽性能。

G-MWNT（graphite multi-wall carbon nanotubes）/Fe/ABS composite is prepared by the way of melt blending. The mechanical properties and shielding effectiveness of the composite are tested, and the effect of G-MWNT content on the performance and microstructure of the ABS composites is investigated. The results indicate that G-MWNT can maximally improve the tensile strength and modulus, and micro-hardness of ABS when the mass ratio of G-MWNT is 35% - 40%. The electromagnetic shielding effectiveness of the composite increases obviously with the increase of G-MWNT/Fe mass fraction, and the composite has excellent shielding properties in the waveband range of 50 kHz to 1.5 GHz. The electromagnetic shielding effectiveness can be also remarkably improved by adding Fe nano-powder into the composite.