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1、聚酰亚胺和碳纳米管复合材料的应用uThe property of Polyimide and CNT and their initial applicationuThe specific application of PI/CNT compositesuSome other use of PI/CNT compositesAbstract: The property of Polyimide and CNT and their initial applicationThe Property of Polyimide and Carobon Nanotube High Youngs modulu
2、s and tensile strength.Can be metallic or semiconducting depending on their structural parameters.Superior thermal stabilityGood dielectric propertiesGood chemical &radiation resistanceLow thermal expansion coefficientHigh strengthHigh flexibilityPolyimide:Carbon nanotube:The Advantage of Polymeric
3、NanocompositesThe Application of PI/CNT composites in Aerospace Future aerospace vehicles will require a signifi-cant reduction of mass, size of components, and power requirements, accompanied by an increase in the intelligence of these components. Single wall carbon nanotubes (SWNTs) are attractive
4、 for these applications because of their extraordinary combination of thermal, electrical, dielectric, and mechanical properties. The specific application of PI/CNT compositesElectrostatic discharge (ESD)Polyimides are widely used in applications ranging from microelectronics to aerospace. Due to th
5、eir insulating nature, significant accumulation of 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 electrostati
6、c discharge, as well as mechanical and thermal properties superior to that of the base polymer.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 measureme
7、ntsKum-Pyo Yoo, Lee-Taek Lim,ect. Novel resistive-type humidity sensor based on multiwall carbon nanotube/polyimide composite films. Sensors and Actuators B: Chemical 2010, 145: 120-125.Kum-Pyo Yoo, Lee-Taek Lim developed a novel resistive-type RH sensor based on plasma-treated multiwall carbon nano
8、tube/polyimide (pMWCNT/PI) composite films, successfully overcome these drawbacks.The advantage of polyimide-based polymers in humidity sensingHigh sensitivityBi-directional water transportResistance to most chemical attacksHigh temperature capabilityCompatible with the CMOS processThe comparison be
9、tween capacitive and resistive-type huminity sensorhigh cut-off humidity (detection limit) at around 3042% relative humidity (RH).Pressure sensorThe advantage of polyimide based pressure sensor:lightMechanically durableThermal stabilityflexibleRelatively easy to manufactureCompared with piezoelectri
10、c, magnetoresistive, optical, and acoustic stress and strain sensors, piezoresistive sensors 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 aerospac
11、e application.Piezoresistive Characteristics of Single Wall Carbon Nanotube/Polyimide Nanocomposites. Journal of Polymer Science: Part B: Polymer Physics, Vol. 47, 9941003 (2009)Piezoresistive characteristics of MWNT nanocomposites and fabrication as a polymer pressure sensor. Nanotechnology 20 (200
12、9) 185503 (11pp) flexible copper clad laminated (FCCL) filmshigh flexibilityhigh glass transition temperature low thermal expansion coefficientexcellent thermal stabilityradiation resistance. The advantage of polyimide used in FCCL:superior the thermal, electrical and mechanical propertiesLow therma
13、l expansion coefficientHigher dielectric constant PI/CNT composites used in FCCL:ActuatorAn actuator is a mechanical device for moving or controlling a mechanism or system. It takes energy, usually transported by air, electric current, or liquid, and converts that into some kind of motion. -Wikipedi
14、aImproved electromechanical responsesuperior mechanical and electrical propertiesLight weightGood conformabilityHigh toughnessTailorable All-Organic Actuator Fabricated with Single Wall Carbon Nanotube Electrodes. Journal of Polymer Science: Part B: Polymer Physics, Vol. 46, 25322538 (2008) Schemati
15、c diagram of preparing an all-organic actuator (cross section view) A prototype actuator filmThe advantage of polymer based actuator:The addition of SWCNTs lead to significant enhancement of the electrostrictive strain due to the increase of interfacial polarization.exhibits superb actuation propert
16、ies and can withstand high temperatures with improved mechanical integrity and chemical stability.Polyimide/CNT based actuator:Could PI/CNT composites be used as electrode?AgCNTfilmsCommonmetalComparison of CNT and common metal6.0610_9=10_7280ScmPI/CNT0.1%wt1.610_-8Some other use of PI/CNT composite
17、sSome other use of PI/CNT compositesGas separation (carbon molecular sieve membranes)tribologicalsuperhydrophobicityHigh thermal stabilityHigh permeability and selectiveExcellent gas separationHigh chemical and wear resistanceStable in various harsh atmosphereThermal stabilityGood mechanical strengt
18、hA comparison of carbon/nanotube molecular sieve membranes with polymer blend carbon molecular sieve membranes for the gas permeation application. Microporous and Mesoporous Materials 113 (2008) 499510Biomimetic polyimide nanotube arrays with slippery or sticky superhydrophobicity. Journal of Colloi
19、d and Interface Science 344 (2010) 541546Carbon Nanotube Reinforced Polyimide Thin-film for High Wear Durability. Tribol Lett (2007) 27:181188High thermal stabilityHigh chemical resistanceReasonable tribological propertiesEffective in improving tribological properties of various substrates such as Si, steel etc.