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1、1 Microcellulargraphenefoamforimprovedbroadbandelectromagneticinterferenceshielding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 18 Ourresearchinterests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RegularP
2、PwasusedtoproducePPfoam通用PP用作发泡体系 4 Developmentofmulti functionalpolymerfoamfilm开发多功能聚合物发泡薄膜 Ourresearchinterests我们的研究兴趣 5 Advantagesof 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 Ab
3、sorbingthemicrowaveasamazestructure 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 Ha
4、rmfuleffectsofEMwave电磁波的危害 8 Radardetection雷达探测 Electromagneticstealthmaterials Radardetection BroadbandEMwavetransmittedorreceivedbyradar ClassicalprotectionagainstEMIMetalsheetsBut highdensityPoormechanicalflexibilityCorrosionLimitedtuningoftheshieldingeffectiveness SE AdvantagesbroughtbypolymersE
5、asyshapingLightweightLowcostButmostpolymersaretransparenttotheEMIwaveMethodstoimprovetheEMISEofpolymersTodisperseelectricallyconductivefillersinpolymermatrix Thecarbonmaterialssuchascarbonblack graphite carbonnanotube graphenenanosheetsareusuallyselectedastheconductivefillers ClassicalmaterialsforEM
6、Ishielding经典的电磁屏蔽材料 NovelcellularstructureofpolymercompositesforEMIshielding Polymer conductivefillercomposite Polymer conductivefillercompositefoam 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 micro
7、electrionics Superiorthermalstability 耐高温Flameretardancy 阻燃Excellentmechanicalproperties 有益的性能Flexible 柔性 HighTg 220 C Flameretardant SolidstatfoamingusingcompressedCO2asthephysicalblowingagent PreparationofhighperformancePEImicrocellularfoam制备高性能PEI微发泡材料 Miller D etal Polymer 2011 52 2910 Published
8、dataofmicrocellularhighperformancefoam 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 m3 Expansionrate 15times W T Zhai W W Feng J Q Ling W G Zheng Ind Eng Chem Res 2012 51 12827 THFasaco blowingagent Tg 265 C Cellsi
9、ze 20 30 m CellmorphologyofmicrocellularPIbeadfoamPEI微发泡粒子的泡孔形态 CompressionmoldingofPIbeadfoam模压粘结成型 Tg 230 C 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 9 PImicrocellularfoamwithsuperhighvolumeexpansion 制备超高倍率PI泡沫 Compressionmolding模压成型 Highprocessin
10、gtemperatureupto320 360 C 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 ChallenginginthepreparationofPIcomp
11、ositefoamwithhighfillerloading制备高填充PI复合材料泡沫的挑战 20 Methodtosolvethechallenging 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 DMFsolution
12、Samplesize 2 3mm 22 EMISEtest 电磁屏蔽效能测试 R SZVA67vestornetworkanalyzer网络分析仪Samplesize 22 5mm 10 0mm Forthecommercialusage 20dB商用电磁屏蔽材料需要效能大于20dB PEI graphenemicrocellularfoamusedforEMIshielding 电磁屏蔽效能 24 PreparationofhighthermalstablePI graphenemicrocellularfoam 制备泡沫 Theimproveddispersionofgrapheneoxi
13、debyin 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 25 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 27 Preparationofcarbon graphenemicrocellularfoam 制备石墨烯
14、碳泡沫 Y Li W T Zhai etal Carbon 2016 100 375 385 PI 350 C Carbonization 1000 1500 C Graphitization 2100 2600 C 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 assembly
15、ofGOintotheGOfilm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 sp3C sp2C TheEMISEofGOandgraphene屏蔽效能 B Shen W T Zhai etal Carbon
16、2016 102 154 Preparationofgraphenefoambythehydrazinefoaming 水合肼发泡制备石墨烯泡沫 ThegeneratedCO2andH2Ogasduringchemicalreductionwasusedforexpansion 化学还原过程中产于的气体用于发泡 ComparisonoftheEMISEofgraphenefoamandfilminbroadbandrange 屏蔽效能 8 2 59 6GHzincludingX band Ku band K band Ka band andU band Thepossiblemechanism 可能的机理 37 Conclusions 结论 LightweightgraphenenanocompositesfoamssuchasPEI graphene PI graphene carbon graphene graphenefoamshadbeenfabricatedinthisstudy 采用相分离的方法 制备了含有高含量的PEI PEI复合泡沫Thebubblestructuree
