聚酰亚胺和碳纳米管复合材料的应用精品文档

Ag
Common metal
CNT films
PI/CNT 0.1%wt
6.06·10_9 >=10_7
280
1.6·10_-8
S·cm
Some other use of PI/CNT composites
Polyimide:
• High flexibility • High strength • Low thermal expansion coefficient • Good chemical &radiation resistance • Superior thermal stability • Good dielectric properties
Pressure sensor
The advantage of polyimide based pressure sensor:
• light • Mechanically durable • Thermal stability • flexible • Relatively easy to manufacture
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.
The specific application of PI/CNT composites
Electrostatic discharge (ESD)
Polyimides are widely used in applications ranging from microelectronics to aerospace.
CNT
Polyimide
Electrical composites
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.
Carbon nanotube:
• High Young’s modulus and tensile strength.
• Can be metallic or semiconducting depending on their structural parameters.
The Advantage of Polymeric Nanocomposites
The advantage of polymer based actuator:
Schematic diagram of preparing an all-organic actuator (cross section view)
• Improved electromechanical response • superior mechanical and electrical properties • Light weight • Good conformability • High toughness • Tailorable
Piezoresistive Characteristics of Single Wall Carbon Nanotube/Polyimide Nanocomposites. Journal of Polymer Science: Part B: Polymer Physics, Vol. 47, 994–1003 (2009)
Resistive-type huminity sensor
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
Single wall carbon nanotubes (SWNTs) are attractive for these applications because of their extraordinary combination of thermal, electrical, dielectric, and mechanical properties.
Polyimide/CNT based actuator:
A prototype actuator film
• 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.
Could PI/CNT composites be used as electrode? Comparison of CNT and common metal
Compared with piezoelectric, 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 aerospace application.
The specific application of PI/CNT composites
Some other use of PI/CNT composites
The property of Polyimide and CNT and their initial application
The Property of Polyimide and Carobon Nanotube
Kum-Pyo Yoo, Lee-Taek Lim,ect. Novel resistive-type humidity sensor based on multiwall carbon nanotube/polyimide composite films. Sensors and Actuators B: Chemical 2019, 145: 120-125.
The 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.
Kum-Pyo Yoo, Lee-Taek Lim developed a novel resistive-type RH sensor based on plasma-treated multiwall carbon nanotube/polyimide (pMWCNT/PI) composite films, successfully overcome these drawbacks.
• Resistive type humidity sensor : much simpler and more straightforward than capacitance measurements
high cut-off humidity (detection limit) at around 30–42% relative humidity (RH).
The Application of Polyimide/Carbon Nanotube Composites in Electrical Conductivity
Headstorm
Abstract:
The property of Polyimide and CNT and their initial application
Piezoresistive characteristics of MWNT nanocomposites and fabrication as a polymer pressure sensor. Nanotechnology 20 (2009) 185503 (11pp)
flexible copper clad laminated (FCCL) films
Actuator
An 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. -Wikipedia
The comparison between capacitive and resistive-type huminity sensor
• capacitive type humidity sensor : uses less power and has muΒιβλιοθήκη h better linearity.
All-Organic Actuator Fabricated with Single Wall Carbon Nanotube Electrodes. Journal of Polymer Science: Part B: Polymer Physics, Vol. 46, 2532–2538 (2019)
The advantage of polyimide used in FCCL: •high flexibility •high glass transition temperature •low thermal expansion coefficient •excellent thermal stability •radiation resistance.
PI/CNT composites used in FCCL:
• superior the thermal, electrical and mechanical properties
• Low thermal expansion coefficient
• Higher dielectric constant