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Thermally Conductive, Insulated Polyimide Nanocomposites by AlO ( OH)-coated MWCNTs  
Thermally Conductive, Insulated Polyimide Nanocomposites by AlO ( OH)-coated MWCNTs
资料类型: PDF文件
关键词: Thermal  conductive  Insulated  Polyimide  AIO(OH)  Nanocomposites  
资料大小: 77K
所属学科: 通用高分子材料
来源: 来源网络
简介:
Polyimidesarewidelyusedinthemicroelectronicsandaerospaceindustriesasmaterialsforelectronicpackagingandelectricalinsulatingduetotheirexcellentthermalstability,mechanicalpropertiesandlowdielectricconstants.Owingtothedemandfordenserandfastercircuitsinelectronicdevices,thedissipationofheatgeneratedbyelectroniccomponentshasattractedincreasingattentionandisconsideredtobeacriticalissueforresolution.Here,wereportanovelapproachtofabricatethermallyconductive,insulatedCNT-basedonpolyimidenanocompositesbyaparticularsurfacemodificationofCNTs.SurfacemodificationoftheMWCNTswascarriedoutbyadirectimpregnationtechniqueandwascharacterizedbyTEM,energydispersiveX-rayspectroscopicanalysis(EDX)andX-RayDiffraction(XRD)analyses.BPDA-SDA-ODApolyimidewasusedasthepolymermatrixinthisstudy.DifferentcontentsofMWCNTsormodifiedMWCNTswereusedasconductivefillers.AseriesofMWCNT/PAAandAIO(OH)-MWCNT/PAAsolutionswerepreparedusinganin-situpolymerizationprocessundersonicationwithdifferentMWCNTandAIO(OH)-MWCNTconcentrations.Thenanocompositesweredeterminedbyultraviolet-visiblespectrophotometerSEM,TEMandthermalanalyzer,etc.TheresultsshowedthattheMWCNTsurfacesmodifiedbytheAlO(OH)layereffectivelyavoidedtheformationofanMWCNTelectricallyconductivenetworkinthePImatrix,withthevaluesofRvandRsbeingsixordersofmagnitudehigherthanthatoftheunmodifiedcompositewhentheMWCNTcontentis2.0wt%.ThethermalconductivepropertiesofthemodifiedMWCNT/PInanocompositefilmswereobviouslyimprovedbyverylowloadingsofa-AIO(OH)-MWCNTs,being2.31-timesofthatforthematrixwhenthefillercontentis5wt%.
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