利用La(NO3)3掺杂后的碳纳米管(MWCNTs-La(NO3)3)作为电磁波吸收剂、环氧树脂(EP)作为基体，制备出了MWCNT-La(NO3)3/EP复合材料。运用透射电子显微镜和X射线衍射仪对MWCNTs、MWCNT-La(NO3)3的微观结构进行了表征，使用示差扫描热分析仪、电子万能试验机、摆锤冲击试验机和矢量网络分析仪对MWCNT/EP、MWCNT-La ( NO3)3/EP复合材料的电磁性能、热固化行为和力学性能进行了测试分析。结果表明，适量掺杂La(NO3)3可以有效改善MWCNTs的复介电常数和磁导率，使MWCNT/EP复合材料在8.2~12.4 GHz频率范围内的介电损耗和磁损耗大幅度提高，吸收电磁波的能力增强。 MWCNTs对EP体系的固化具有促进作用。适量掺杂La( NO3)3后，这种促进作用具有增强趋势。并且掺杂少量的La( NO3)3对MWCNT/EP复合材料的力学性能影响不明显。
La( NO3 ) 3-doped MWCNT/epoxy resin ( EP) composites were prepared by a solution bending method. Acid-oxidized MWCNTs were first used to adsorb La( NO3 ) 3 and were then mixed with EP as matrix and ethylenediamine as a curing agent. The microstructure and morphology of the MWCNTs and MWCNTs-La(NO3)3 were investigated by TEM and XRD. The electromag-netic wave absorption properties, curing behavior and mechanical properties of MWCNT/EP and MWCNT-La( NO3 ) 3/EP compos-ites were measured by a vector network analyzer, differential scanning calorimetry, an electronic universal tester and a pendulum im-pact tester. Results indicate that the complex permittivity and permeability of the MWCNTs doped with La(NO3)3 are much im-proved, leading to a substantial increase in the dielectric and magnetic loss of the La( NO3 ) 3-doped MWCNT/EP composite in the frequency range from 8. 2 to 12. 4 GHz and therefore an increase of its electromagnetic wave absorption. The curing rate of EP is ac-celerated by both the MWCNTs and La( NO3 ) 3 . The mechanical properties of the MWCNT/EP composite are degraded only slightly by the La( NO3 ) 3 doping.
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