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1、uThe property of Polyimide and CNT and their initial applicationuThe specific application of PI/CNT compositesuSome other use of PI/CNT compositesAbstract:第1页/共16页The property of Polyimide and CNT and their initial application第2页/共16页The Property of Polyimide and Carobon NanotubeHighYoungsmodulusand
2、tensilestrength.Canbemetallicorsemiconductingdependingontheirstructuralparameters.SuperiorthermalstabilityGooddielectricpropertiesGoodchemical&radiationresistanceLowthermalexpansioncoefficientHighstrengthHighflexibilityPolyimide:Carbonnanotube:第3页/共16页The Advantage of Polymeric Nanocomposites第4页/共16
3、页The Application of PI/CNT composites in AerospaceFutureaerospacevehicleswillrequireasignifi-cantreductionofmass,sizeofcomponents,andpowerrequirements,accompaniedbyanincreaseintheintelligenceofthesecomponents.Singlewallcarbonnanotubes(SWNTs)areattractivefortheseapplicationsbecauseoftheirextraordinar
4、ycombinationofthermal,electrical,dielectric,andmechanicalproperties.第5页/共16页The specific application of PI/CNT composites第6页/共16页Electrostatic discharge(ESD)Polyimides are widely used in applications ranging from microelectronics to aerospace.Due to their insulating nature,significant accumulation o
5、f electrostatic charge may result on their surface,causing local heating and premature degradation to electronic components or space structures.CNTPolyimideElectrical compositeswith a level of electrical conductivity sufficient to permit electrostatic discharge,as well as mechanical and thermal prop
6、erties superior to that of the base polymer.第7页/共16页Resistive-type huminity sensorcapacitive type humidity sensor:uses less power and has much better linearity.Resistive type humidity sensor:much simpler and more straightforward than capacitance measurementsKum-PyoYoo,Lee-TaekLim,ect.Novelresistive-
7、typehumiditysensorbasedonmultiwallcarbonnanotube/polyimidecompositefilms.SensorsandActuatorsB:Chemical2010,145:120-125.Kum-PyoYoo,Lee-TaekLimdevelopedanovelresistive-typeRHsensorbasedonplasma-treatedmultiwallcarbonnanotube/polyimide(pMWCNT/PI)compositefilms,successfullyovercomethesedrawbacks.The adv
8、antage of polyimide-based polymers in humidity sensingHigh sensitivityBi-directional water transportResistance to most chemical attacksHigh temperature capabilityCompatible with the CMOS processThe comparison between capacitive and resistive-type huminity sensorhigh cut-off humidity(detection limit)
9、at around 3042%relative humidity(RH).第8页/共16页Pressure sensorThe advantage of polyimide based pressure sensor:lightMechanically durableThermal stabilityflexibleRelatively easy to manufactureCompared with piezoelectric,magnetoresistive,optical,and acoustic stress and strain sensors,piezoresistive sens
10、ors have attracted particular attention because they are not influenced by unexpected external stimuli such as static charges and magnetic fields.So piezoresistive sensors are particularly suitable for aerospace application.Piezoresistive Characteristics of Single Wall Carbon Nanotube/Polyimide Nano
11、composites.Journal of Polymer Science:Part B:Polymer Physics,Vol.47,9941003(2009)PiezoresistivecharacteristicsofMWNTnanocompositesandfabricationasapolymerpressuresensor.Nanotechnology20(2009)185503(11pp)第9页/共16页 flexible copper clad laminated(FCCL)filmshighflexibilityhighglasstransitiontemperaturelo
12、wthermalexpansioncoefficientexcellentthermalstabilityradiationresistance.The advantage of polyimide used in FCCL:superiorthethermal,electricalandmechanicalpropertiesLowthermalexpansioncoefficientHigherdielectricconstantPI/CNT composites used in FCCL:第10页/共16页ActuatorAnactuatorisamechanicaldeviceform
13、ovingorcontrollingamechanismorsystem.Ittakesenergy,usuallytransportedbyair,electriccurrent,orliquid,andconvertsthatintosomekindofmotion.-WikipediaImproved electromechanical responsesuperior mechanical and electrical propertiesLight weightGood conformabilityHigh toughnessTailorable All-OrganicActuato
14、rFabricatedwithSingleWallCarbonNanotubeElectrodes.JournalofPolymerScience:PartB:PolymerPhysics,Vol.46,25322538(2008)Schematicdiagramofpreparinganall-organicactuator(crosssectionview)AprototypeactuatorfilmThe advantage of polymer based actuator:The addition of SWCNTs lead to significant enhancement o
15、f the electrostrictive strain due to the increase of interfacial polarization.exhibits superb actuation properties and can withstand high temperatures with improved mechanical integrity and chemical stability.Polyimide/CNT based actuator:第11页/共16页Could PI/CNT composites be used as electrode?AgCNTfil
16、msCommonmetalComparisonofCNTandcommonmetal6.0610_9=10_7280ScmPI/CNT0.1%wt1.610_-8第12页/共16页Some other use of PI/CNT composites第13页/共16页Some other use of PI/CNT compositesGas separation(carbon molecular sieve membranes)tribologicalsuperhydrophobicityHigh thermal stabilityHigh permeability and selectiv
17、eExcellent gas separationHigh chemical and wear resistanceStable in various harsh atmosphereThermal stabilityGood mechanical strengthAcomparisonofcarbon/nanotubemolecularsievemembraneswithpolymerblendcarbonmolecularsievemembranesforthegaspermeationapplication.MicroporousandMesoporousMaterials113(200
18、8)499510Biomimeticpolyimidenanotubearrayswithslipperyorstickysuperhydrophobicity.JournalofColloidandInterfaceScience344(2010)541546CarbonNanotubeReinforcedPolyimideThin-filmforHighWearDurability.TribolLett(2007)27:181188High thermal stabilityHigh chemical resistanceReasonable tribological propertiesEffective in improving tribological properties of various substrates such as Si,steel etc.第14页/共16页第15页/共16页感谢您的观看。第16页/共16页