摘要
利用La(NO3)3和Ce(NO3)3掺杂的碳纳米管(MWCNTs-La(NO3)3和MWCNTs-Ce(NO3)3)作为吸收剂、聚氯乙烯(PVC)作为基体,制备出MWCNT-La(NO3)3(或Ce(NO3)3)/PVC复合材料。运用透射电子显微镜和X射线衍射仪对MWCNTs、MWCNTs-La(NO3)3、MWCNTs-Ce(NO3)3的微观结构进行表征分析,使用同步热分析仪和矢量网络分析仪对MWCNT/PVC、MWCNT-La(NO3)3/PVC、MWCNT-Ce(NO3)3/PVC复合材料的热解行为和吸波性能进行测试分析。结果表明,在2～18GHz频率范围内,适量掺杂La(NO3)3或Ce(NO3)3可以使MWCNT/PVC复合材料的吸波性能大幅度提高,而热解行为变化不明显。在反射率R<-10dB的范围内,MWCNT-Ce(NO3)3/PVC复合材料的吸收频宽(约为5.4GHz)虽然不及MWCNT-La(NO3)3/PVC的吸收频宽(约为5.6GHz)宽,但是吸收频段和吸收峰峰值均向高频区域移动,有利于提高复合材料的高频吸波性能。
Multiwalled carbon nanotubes （MWCNTs） doped respectively La（NO3）3 and Ce（NO3）3 as absorber and polyvinyl chloride （PVC） as matrix were used to fabricate MWCNT/PVC composites. The microstructure and micromorphology of MWCNTs doped respectively La（NO3）a and Ce（NO3 ）3 were investigated using trans- mission electron microscope （TEM） and X-ray diffraction （XRD）. The electromagnetic wave absorption prop- erties and pyrolysis behaviour of MWCNT/PVC, MWCNT La（NO3）3/PVC and MWCNT-Ce（NO3）3/PVC composites were measured by a network analyzer and simultaneous thermal analysis. The results indicated that the electromagnetic wave absorbing properties of MWCNT/PVC composites were substantially improved after doping with a suitable amount of rare earth element in the frequency range from 2 to 18GHz, and the pyrolysis behaviour amost did not changed. In the range of R〈-10dB of the reflection losses, the absorbing bandwidlhs of MWCNT Ce（NO3 ）3/PVC composites was narrower （about 5.4GHz） than that of MWCNT-La（NO3 ）3/PVC composites （about 5.6GHz）, and the absorption band and peak value shifted to the higher frequency region. It is favorable to improve the electromagnetic wave absorption properties of MWCNT/PVC composites in a high frequency region.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2013年第12期1741-1744,共4页
Journal of Functional Materials
基金
中国高等学校博士学科点专项科研基金资助项目(20096102120016
20116102110014)
中国航天科技创新基金资助项目(CASC200906)
陕西省自然科学基金资助项目(2009GM6001-1)
西北工业大学基础研究基金资助项目(JC201030)
关键词
稀土
碳纳米管
聚氯乙烯
吸波性能
rare earth
multiwalled carbon nanotubes
polyvinyl chloride
electromagnetic wave absorbing properties
