石墨烯泡沫应用于宽屏电磁波屏蔽PPT file Wentao Zhai

1Microcellulargraphenefoamforimprovedbroadbandelectromagneticinterferenceshielding石墨烯泡沫应用于宽屏电磁波屏蔽WentaoZhai翟文涛NingboInstitute,CAS中科院宁波材料所2016－10－18Ourresearchinterests我们的研究兴趣Developmentofextrusionfoamingtechnology开发连续挤出发泡技术

ExtrusionfoamingsystemwithusingCO2astheblowingagent;以超临界CO2流体为发泡剂RegularPPwasusedtoproducePPfoam

通用PP用作发泡体系Developmentofautoclavefoamingtechnology开发釜压发泡技术EPPEPPEPLAEPIETPUOurresearchinterests我们的研究兴趣4Developmentofmulti-functionalpolymerfoamfilm开发多功能聚合物发泡薄膜

Polymer/filler/DMFPrecipitationDryingRedissolvingWatervaporinducedphaseseparationWatervaporH2OSolutionblendingPolymernanocompositePolymerfoamfilmDryingFilmcastingOurresearchinterests我们的研究兴趣5Advantagesof(microcellar)foaming微发泡的优势lightweight/轻量化;Thermalinsulation/隔热;Soundinsulation/隔音；Improvedimpact/cushionproperties/提高了冲击/缓冲性能；Reduceddielectricproperties/降低了介电性能Absorbingthemicrowaveasamazestructure;

为电磁波提供迷宫结构；EMIshieldingmaterials电磁屏蔽材料Advantagesof(microcellar)foaming微发泡的优势EMinterferenceeffects电磁干扰CompromisetheperformanceandlifetimeofdevisesInterferewiththefunctionofothernearbycomponentsEMinformationleakage电磁泄露Computer,cellphone,Todamagethehumanbody危害人体HarmfuleffectsofEMwave电磁波的危害8Radardetection雷达探测ElectromagneticstealthmaterialsRadardetection:BroadbandEMwavetransmittedorreceivedbyradarClassicalprotectionagainstEMIMetalsheetsBut:highdensityPoormechanicalflexibilityCorrosionLimitedtuningoftheshieldingeffectiveness(SE)AdvantagesbroughtbypolymersEasyshapingLightweightLowcostButmostpolymersaretransparenttotheEMIwaveMethodstoimprovetheEMISEofpolymersTodisperseelectricallyconductivefillersinpolymermatrixThecarbonmaterialssuchascarbonblack,graphite,carbonnanotube,graphenenanosheetsareusuallyselectedastheconductivefillers.ClassicalmaterialsforEMIshielding经典的电磁屏蔽材料NovelcellularstructureofpolymercompositesforEMIshieldingPolymer/conductivefillercompositePolymer/conductivefillercompositefoam金属材料的电磁屏蔽机制为反射损耗；聚合物复合材料以反射损耗为主；均易导致电磁波二次污染问题。入射波能量反射波能量透射波能量聚合物发泡材料以吸收损耗为主，有效避免电磁波的二次污染问题透射波能量入射波能量反射波能量TendencyofEMIshieldingmaterials电磁屏蔽材料发展趋势Lighter/轻量化Thinner/更薄HigherEMISE/更高的屏蔽效能Fortheapplicationinspecialfieldssuchasaerospace,weaponequipment,microelectrionics.Superiorthermalstability/耐高温Flameretardancy/阻燃Excellentmechanicalproperties/有益的性能Flexible/柔性HighTg:220C;Flameretardant;SolidstatfoamingusingcompressedCO2asthephysicalblowingagentPreparationofhighperformancePEImicrocellularfoam制备高性能PEI微发泡材料Miller,D.etal.,Polymer,2011,52,2910.Publisheddataofmicrocellularhighperformancefoam/发表的高性能聚合物发泡材料论文Expansionratiolowerthan5times膨胀倍率低于5倍MethodtoimprovetheexpansionratioofPImicrocellularfoam/提高膨胀倍率的方法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微发泡粒子的泡孔形态CompressionmoldingofPIbeadfoam模压粘结成型Tg:230C,50timesexpansion/50倍膨胀;翟文涛，郑文革，凌建强，中国发明专利，

201210171721.X翟文涛，郑文革，冯卫卫，凌建强，中国发明专利，

201210170254.9PImicrocellularfoamwithsuperhighvolumeexpansion/制备超高倍率PI泡沫Compressionmolding模压成型

Highprocessingtemperatureupto320-360C/加工温度高达320-360度；Highviscosityofcompositemeltanddifficulttodispersehighcontentofnanofillers/体系粘度高，难以分散;

Difficulttoachieveahighfoamexpansionratio/难以得到高的膨胀倍率；

AhighfillercontentrequirementtoachieveagoodEMIshieldingproperties/优异的屏蔽效能需要添加高含量的吸收剂！ChallenginginthepreparationofPIcompositefoamwithhighfillerloading制备高填充PI复合材料泡沫的挑战20Polymer/filler/DMFPrecipitationDryingRedissolvingWatervaporinducedphaseseparationWatervaporH2OSolutionblendingPolymernanocompositePolymerfoamfilmDryingFilmcastingMethodtosolvethechallenging/解决办法PreparationofPEI/graphenemicrocellularfoam/制备PEI/石墨烯发泡材料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/电磁屏蔽效能测试R&SZVA67vestornetworkanalyzer网络分析仪

Samplesize:22.5mm10.0mmFoaming:Volumeexpansionof5timesForthecommercialusage20dB商用电磁屏蔽材料需要效能大于20dBPEI/graphenemicrocellularfoamusedforEMIshielding/电磁屏蔽效能24PreparationofhighthermalstablePI/graphenemicrocellularfoam/制备泡沫Theimproveddispersionofgrapheneoxidebyin-situpolymerization通过原位聚合来改善氧化石墨烯的分散Y.Li,W.T.Zhai*,etal.,RSCAdv.,2015,5,24342.25Thermalimidizationat350C350度亚胺化CellmorphologyofPAA/graphaneandPI/graphenemicrocellularfoams/泡孔形态Sampleswiththethicknessof0.8mm样品厚度仅为0.8毫米

EMISEofPI/graphenemicrocellularfoam/PI/石墨烯泡沫的电磁屏蔽效能16wt%rGO27PMDA/ODA/GO/DMFCarbonizationandgraphitizationImidizationCastingonglasssubstrateInsitupolymerizationPhaseseparationMicrocellularPI/graphenefoamsCarbon/graphenefoamGraphiteplateN2atmospherePAA/GOcastingsolutionCoagulantbathPreparationofcarbon/graphenemicrocellularfoam/制备石墨烯/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/石墨化过程中泡孔结构的演变EMISEofcarbon/graphenemicrocellularfoam/石墨烯/碳复合泡沫的屏蔽效能PreparationofgraphenefilmbydirectevaporationofGOsuspension/GO薄膜

self-assemblyofGOintotheGOfilm

自组装成GO薄膜；GOwasthermalreductionintographenefilm；

热还原成石墨烯薄膜B.Shen,W.T.Zhai*,W.G.Zheng*,AdvancedFunctionalMaterials,2014,24,4542.Proofsofthethermalreductionofgrapheneoxideintographene/热还原的证据ConductivityofGOandgrpahene电导率sp3Csp2CTheEMISEofGOandgraphene屏蔽效能

B.Shen,W.T.Zhai*etal.,Carbon,2016,102,154.Preparationofgraphenefoambythehydrazinefoaming/水合肼发泡制备石墨烯泡沫ThegeneratedCO2andH2Ogasduringche