石墨烯泡沫應(yīng)用于寬屏電磁波屏蔽PPT file Wentao Zhai

1Microcellulargraphenefoamforimprovedbroadbandelectromagneticinterferenceshielding石墨烯泡沫應(yīng)用于寬屏電磁波屏蔽WentaoZhai翟文濤NingboInstitute,CAS中科院寧波材料所2016－10－18Ourresearchinterests我們的研究興趣Developmentofextrusionfoamingtechnology開發(fā)連續(xù)擠出發(fā)泡技術(shù)

ExtrusionfoamingsystemwithusingCO2astheblowingagent;以超臨界CO2流體為發(fā)泡劑RegularPPwasusedtoproducePPfoam

通用PP用作發(fā)泡體系Developmentofautoclavefoamingtechnology開發(fā)釜壓發(fā)泡技術(shù)EPPEPPEPLAEPIETPUOurresearchinterests我們的研究興趣4Developmentofmulti-functionalpolymerfoamfilm開發(fā)多功能聚合物發(fā)泡薄膜

Polymer/filler/DMFPrecipitationDryingRedissolvingWatervaporinducedphaseseparationWatervaporH2OSolutionblendingPolymernanocompositePolymerfoamfilmDryingFilmcastingOurresearchinterests我們的研究興趣5Advantagesof(microcellar)foaming微發(fā)泡的優(yōu)勢lightweight/輕量化;Thermalinsulation/隔熱;Soundinsulation/隔音；Improvedimpact/cushionproperties/提高了沖擊/緩沖性能；Reduceddielectricproperties/降低了介電性能Absorbingthemicrowaveasamazestructure;

為電磁波提供迷宮結(jié)構(gòu)；EMIshieldingmaterials電磁屏蔽材料Advantagesof(microcellar)foaming微發(fā)泡的優(yōu)勢EMinterferenceeffects電磁干擾CompromisetheperformanceandlifetimeofdevisesInterferewiththefunctionofothernearbycomponentsEMinformationleakage電磁泄露Computer,cellphone,Todamagethehumanbody危害人體HarmfuleffectsofEMwave電磁波的危害8Radardetection雷達探測ElectromagneticstealthmaterialsRadardetection:BroadbandEMwavetransmittedorreceivedbyradarClassicalprotectionagainstEMIMetalsheetsBut:highdensityPoormechanicalflexibilityCorrosionLimitedtuningoftheshieldingeffectiveness(SE)AdvantagesbroughtbypolymersEasyshapingLightweightLowcostButmostpolymersaretransparenttotheEMIwaveMethodstoimprovetheEMISEofpolymersTodisperseelectricallyconductivefillersinpolymermatrixThecarbonmaterialssuchascarbonblack,graphite,carbonnanotube,graphenenanosheetsareusuallyselectedastheconductivefillers.ClassicalmaterialsforEMIshielding經(jīng)典的電磁屏蔽材料NovelcellularstructureofpolymercompositesforEMIshieldingPolymer/conductivefillercompositePolymer/conductivefillercompositefoam金屬材料的電磁屏蔽機制為反射損耗；聚合物復(fù)合材料以反射損耗為主；均易導(dǎo)致電磁波二次污染問題。入射波能量反射波能量透射波能量聚合物發(fā)泡材料以吸收損耗為主，有效避免電磁波的二次污染問題透射波能量入射波能量反射波能量TendencyofEMIshieldingmaterials電磁屏蔽材料發(fā)展趨勢Lighter/輕量化Thinner/更薄HigherEMISE/更高的屏蔽效能Fortheapplicationinspecialfieldssuchasaerospace,weaponequipment,microelectrionics.Superiorthermalstability/耐高溫Flameretardancy/阻燃Excellentmechanicalproperties/有益的性能Flexible/柔性HighTg:220C;Flameretardant;SolidstatfoamingusingcompressedCO2asthephysicalblowingagentPreparationofhighperformancePEImicrocellularfoam制備高性能PEI微發(fā)泡材料Miller,D.etal.,Polymer,2011,52,2910.Publisheddataofmicrocellularhighperformancefoam/發(fā)表的高性能聚合物發(fā)泡材料論文Expansionratiolowerthan5times膨脹倍率低于5倍MethodtoimprovetheexpansionratioofPImicrocellularfoam/提高膨脹倍率的方法Density：90kg/m3Expansionrate:15timesW.T.Zhai*,W.W.Feng,J.Q.Ling,W.G.Zheng,Ind.Eng.Chem.Res.,2012,51,12827.THFasaco-blowingagentTg:265C50mCellsize：20－30mCellmorphologyofmicrocellularPIbeadfoamPEI微發(fā)泡粒子的泡孔形態(tài)CompressionmoldingofPIbeadfoam模壓粘結(jié)成型Tg:230C,50timesexpansion/50倍膨脹;翟文濤，鄭文革，凌建強，中國發(fā)明專利，

201210171721.X翟文濤，鄭文革，馮衛(wèi)衛(wèi)，凌建強，中國發(fā)明專利，

201210170254.9PImicrocellularfoamwithsuperhighvolumeexpansion/制備超高倍率PI泡沫Compressionmolding模壓成型

Highprocessingtemperatureupto320-360C/加工溫度高達320-360度；Highviscosityofcompositemeltanddifficulttodispersehighcontentofnanofillers/體系粘度高，難以分散;

Difficulttoachieveahighfoamexpansionratio/難以得到高的膨脹倍率；

AhighfillercontentrequirementtoachieveagoodEMIshieldingproperties/優(yōu)異的屏蔽效能需要添加高含量的吸收劑！ChallenginginthepreparationofPIcompositefoamwithhighfillerloading制備高填充PI復(fù)合材料泡沫的挑戰(zhàn)20Polymer/filler/DMFPrecipitationDryingRedissolvingWatervaporinducedphaseseparationWatervaporH2OSolutionblendingPolymernanocompositePolymerfoamfilmDryingFilmcastingMethodtosolvethechallenging/解決辦法PreparationofPEI/graphenemicrocellularfoam/制備PEI/石墨烯發(fā)泡材料J.Q.Ling,W.T.Zhai*,W.W.Feng.etal.,ACSAppl.Mater.Interfaces,2013,5,2677.B.Shen,D.D.Lu,W.T.Zhai*,etal.,ACSAppl.Mater.Interfaces,2013,5,11383.PEI/Graphene/DMFsolutionSamplesize:2.3mm22EMISEtest/電磁屏蔽效能測試R&SZVA67vestornetworkanalyzer網(wǎng)絡(luò)分析儀

Samplesize:22.5mm10.0mmFoaming:Volumeexpansionof5timesForthecommercialusage20dB商用電磁屏蔽材料需要效能大于20dBPEI/graphenemicrocellularfoamusedforEMIshielding/電磁屏蔽效能24PreparationofhighthermalstablePI/graphenemicrocellularfoam/制備泡沫Theimproveddispersionofgrapheneoxidebyin-situpolymerization通過原位聚合來改善氧化石墨烯的分散Y.Li,W.T.Zhai*,etal.,RSCAdv.,2015,5,24342.25Thermalimidizationat350C350度亞胺化CellmorphologyofPAA/graphaneandPI/graphenemicrocellularfoams/泡孔形態(tài)Sampleswiththethicknessof0.8mm樣品厚度僅為0.8毫米

EMISEofPI/graphenemicrocellularfoam/PI/石墨烯泡沫的電磁屏蔽效能16wt%rGO27PMDA/ODA/GO/DMFCarbonizationandgraphitizationImidizationCastingonglasssubstrateInsitupolymerizationPhaseseparationMicrocellularPI/graphenefoamsCarbon/graphenefoamGraphiteplateN2atmospherePAA/GOcastingsolutionCoagulantbathPreparationofcarbon/graphenemicrocellularfoam/制備石墨烯/碳泡沫Y.Li,W.T.Zhai*,etal.,Carbon,2016,100,375-385.350oC1000oC1500oC2100oC2600oC2600oC5μm5μm5μm5μm5μm1μmPI(350oC)Carbonization(1000-1500oC)Graphitization(2100-2600oC)Cellmorphologyevolutionduringthepyrolysis/碳化/石墨化過程中泡孔結(jié)構(gòu)的演變EMISEofcarbon/graphenemicrocellularfoam/石墨烯/碳復(fù)合泡沫的屏蔽效能PreparationofgraphenefilmbydirectevaporationofGOsuspension/GO薄膜

self-assemblyofGOintotheGOfilm

自組裝成GO薄膜；GOwasthermalreductionintographenefilm；

熱還原成石墨烯薄膜B.Shen,W.T.Zhai*,W.G.Zheng*,AdvancedFunctionalMaterials,2014,24,4542.Proofsofthethermalreductionofgrapheneoxideintographene/熱還原的證據(jù)ConductivityofGOandgrpahene電導(dǎo)率sp3Csp2CTheEMISEofGOandgraphene屏蔽效能

B.Shen,W.T.Zhai*etal.,Carbon,2016,102,154.Preparationofgraphenefoambythehydrazinefoaming/水合肼發(fā)泡制備石墨烯泡沫ThegeneratedCO2andH2Ogasduringche