cnts%2fpmma微发泡纳米复合材料的制备及其电学性能研究

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1、武汉理工大学硕士学位论文AbstractCorbonnanotube(CNTs)／Polymethylmethacrylate(PMMA)nanocompositesfoamanewfunctionalmaterial．CNTscanhighiyimprovetheconductivityofthefoam，theintroductionofthegasphaSecanreducethedielectricconstantofthematerial．Thisnanocompositesfoamwithhighconductivityandlow

2、dielectricconstantcanabsorbelectromagneticwaveefficiently．Soithasawiderangeofapplicationsinthefieldsofelectronicscientificsuchaselectrostaticprotection，lightningaerospacechamber,electromagneticshieldingshell．Thisresearchpreparedthemicrostructurenanocompositesfoanlswithsmalla

3、nduniformeellsizeusingthesupercriticalfuildfoamingtechnology．Thenthestructureandtheelectricalpropertiesofthefoamswereinvestigated．WiththeCNTscontentof1-2．5wt．％，theeellsizeofnanocompositesfoamsrangedfrom3．9-4．8“m，thecelldensityrangedfrom5．83x1010～6．71x1010cells／cm’．TheCNTscon

4、tenthadnotsignificantinfluenceontheeellstructure．WiththeaspectratioofCNTsrangedfrom50to2000，thecellsizeofthenanocompositesfoamswas3．6～6．1lxm，celldensitywas6．71x1010～8．62x1010cells／cm3．Inaddition，theeellsizewassmallestandthecelldensitywashighestwhentheaspectratioofCNTswas500．

5、Whenthefoamingtemperaturewas50-95℃，thecellsizewas2．2～7．3“m，thecelldensitywas1．05x1010～3．29x1011cells／cm3．TheconductivityoftheCNTS／PMMAnanocompositesfoamSwasloweratlOWfrequencythantheCNTs／PMMAnanocomposites．ButitCanretaintheconductivityoftheCNTS／PMMAnanocompositesathighfreque

6、ncy．TheconductivityoftheCNTS／PMMAnanocompositesfoamsgethigherwiththeC’NTscontent，andbecamehigherthanlowerwiththeaspectratioofCNTs．TheconductivityoftheCN聊MMAnanocompositesfoamsgethigherthanlowerwiththefoamingtemperature．WhentheCNTscontentwas2．5wt．％．theaspectratioofCNTSwas50，t

7、heconductivityoftheCNTs／PMMAnanocompositesfoamswas0．46S／mat1GHz．ThedielectricconstantofCNTs／PMMAnanocompositesfoamsbecame10werastheintroductionofcells．ThedielectricconstantCanIIIreiIuce82～96％．ThedielectricconstantofCNTs／PMMAnanocompositesfoamsbecamehigherwiththeCONscontentan

8、dbecamehigherthanlowerwiththeCNTsaspectratio．WhentheCNTsaspectratiowas50，th