聚酰亚胺和碳纳米管复合材料的应用.ppt

The Application of Polyimide/Carbon Nanotube Composites in Electrical Conductivity,Headstorm,The property of Polyimide and CNT and their initial application The specific application of PI/CNT composites Some other use of PI/CNT composites,Abstract:,The property of Polyimide and CNT and their initial application,The Property of Polyimide and Carobon Nanotube,carbon nanotube,High Youngs modulus and tensile strength. Can be metallic or semiconducting depending on their structural parameters.,Superior thermal stability,Good dielectric properties,Good chemical &radiation resistance,Low thermal expansion coefficient,High strength,High flexibility,Polyimide:,Carbon nanotube:,The Advantage of Polymeric Nanocomposites,The Application of PI/CNT composites in Aerospace,Future aerospace vehicles will require a signi-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 for these applications because of their extraordinary combination of thermal, electrical, dielectric, and mechanical properties.,The specific application of PI/CNT composites,Electrostatic discharge (ESD),Polyimides are widely used in applications ranging from microelectronics to aerospace. Due to their insulating nature, significant accumulation of electrostatic charge may result on their surface, causing local heating and premature degradation to electronic components or space structures.,with a level of electrical conductivity sufficient to permit electrostatic discharge, as well as mechanical and thermal properties superior to that of the base polymer.,Resistive-type huminity sensor,capacitive type humidity sensor :,uses less power and has much better linearity.,Resistive type humidity sensor :,much simpler and more straightforward than capacitance measurements,Kum-Pyo Yoo, Lee-Taek Lim,ect. Novel resistive-type humidity sensor based on multiwall carbon nanotube/polyimide composite lms. 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 nanotube/polyimide (pMWCNT/PI) composite lms, successfully overcome these drawbacks.,The advantage of polyimide-based polymers in humidity sensing,High sensitivity,Bi-directional water transport,Resistance to most chemical attacks,High temperature capability,Compatible with the CMOS process,The comparison between capacitive and resistive-type huminity sensor,high cut-off humidity (detection limit) at around 3042% relative humidity (RH).,Pressure sensor,The advantage of polyimide based pressure sensor:,light,Mechanically durable,Thermal stability,flexible,Relatively easy to manufacture,Compared with piezoelectric, magnetoresistive, optical, and acoustic stress and strain sensors, piezoresistive sensors have attracted particular attention because they are not inuenced by unexpected external stimuli such as static charges and magnetic elds. So piezoresistive sensors are particularly suitable for aerospace 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 (2009) 185503 (11pp),flexible copper clad laminated (FCCL) films,high flexibility high glass transition temperature low thermal expansion coefficient excellent thermal stability radiation resistance.,The advantage of polyimide used in FCCL:,superior the thermal, electrical and mechanical properties Low thermal expansion coefficient Higher dielectric constant,PI/CNT composites used in FCCL:,Actuator,Anactuatoris 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. -Wikipedia,Improved electromechanical response superior mechanical and electrical properties Light weight Good conformability High toughness Tailorable,All-Organic Actuator Fabricated with Single Wall Carbon Nanotube Electrodes. Journal of Polymer Science: Part B: Polymer Physics, Vol. 46, 25322538 (2008),Schematic diagram of preparing an all-organic actuator (cross section view),A prototype actuator film,The 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 properties and can withstand high temperatures with improved mechanical integrity and chemical stability.,Polyimide/CNT based actuator:,Could PI/CNT composites be used as electrode?,Comparison of CNT and common metal,6.0610_9,=10_7,280,Scm,PI/CNT 0.1%wt,1.610_-8,Some other use of PI/CNT composites,Some other use of PI/CNT composites,Gas separation (carbon molecular sieve membranes),tribological,superhydrophobicity,High thermal stability High permeability and selective Excellent gas separation,High chemical and wear resistance Stable in various harsh atmosphere Thermal stability Good mechanical strength,A 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) 499510,Biomimetic polyimide nanotube arrays with slippery or sticky superhydrophobicity. Journal of Colloid and Interface Science 344 (2010) 541546,Carbon Nanotube Reinforced Polyimide Thin-lm for High Wear Durability. Tribol Lett (2007) 27:181188,High thermal stability High chemical resistance Reasonable tribological properties,Effective in improving tribological properties of various substrates such as Si, steel etc.,Thans For Your Attention!,