镧元素掺杂碳纳米管/环氧树脂复合材料的电磁、热学及力学性能

Electromagnetic and mechanical properties of La(NO3)3-doped multi-walled carbon nanotube/epoxy resin composites

    摘要
  • 摘要: 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。

     

    Abstract: 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 electromagnetic wave absorption properties, curing behavior and mechanical properties of MWCNT/EP and MWCNT-La(NO3)3/EP composites were measured by a vector network analyzer, differential scanning calorimetry, an electronic universal tester and a pendulum impact tester. Results indicate that the complex permittivity and permeability of the MWCNTs doped with La(NO3)3 are much improved, 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 accelerated 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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