Polyamideimide-alumina nanocomposites for high-temperatures

Calebrese, Christopher; Nelson, J. K.; Schadler, Linda S.; Schweickart, D.L.

doi:10.1109/icsd.2010.5568086

Cited by 9 publications

(4 citation statements)

References 11 publications

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“…WITH the advantages of high temperature resistance (400 o C ), low temperature tolerance (-269 o C), radiation resistance and excellent dielectric properties, Polyimide (PI) that serves as a typical kind of engineering polymer material has been widely used in different fields, such as the aerial, nuclear, microelectronic industry，turn to turn insulation and turn to ground insulation of inverter-fed motors [1,2]. Many theoretical and experimental studies on its electrical properties have been performed.…”

Section: Introductionmentioning

confidence: 99%

Dynamic behavior of surface charge on direct- fluorinated polyimide films

2013

IEEE Trans. Dielect. Electr. Insul.

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Polyimide film, as a special type of engineering plastic film, is a kind of basic insulating material and is widely applied in the aerial, nuclear, microelectronic industry, turn to turn insulation and turn to ground insulation of inverter-fed motors. However, premature insulation failures occur frequently in motors with the disadvantage of pure PI inherent in all organic materials. The existence of surface charge has a great effect on breakdown characteristic and is the main reason leading to dielectric breakdown. Fluorination as change the chemical component in surface layer of polymers should give rise to the corresponding change in electrical properties of the surface layer thus influence the charge injection from electrodes when they are used as an insulator. This paper presents a study aimed at clarifying the effect of fluorination time on surface charge accumulation and decay behaviors of fluorinated polyimide film. Samples were surface fluorinated in a laboratory vessel at about 328 K (55 ℃) using a F 2 /N 2 mixture with 20% F 2 by volume and 0.05 MPa (500 mbar) for respectively 15, 30, 45 and 60 minutes. Corona charging tests were performed at room temperature with a relative humidity of ~ 40%. The charge distribution was measured by means of an electrostatic voltmeter. Obtained results show the dependence of the charge density as well as the charge decay rate upon the fluorination time of samples, varying as a function of the charge polarity and charging time. It is suggested that the fluorination can significantly improve the decay rate of the surface charge in polyimide films.

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Section: Introductionmentioning

confidence: 99%

Dynamic behavior of surface charge on direct- fluorinated polyimide films

2013

IEEE Trans. Dielect. Electr. Insul.

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“…Although these soft groups reduce the thermal stability of PEI to a certain extent, they inject excellent processing properties into PEI. For example, PEI can achieve hot-winding operations without relying on the adhesive layer [18][19][20].…”

Section: Polyimide (Pi) Polymer Materialsmentioning

confidence: 99%

Research Progress in High-Temperature-Resistant Electromagnetic Wire

Li,

Feng,

Guo

et al. 2024

Materials

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Electromagnetic wire is the carrier of energy and signal transmission. With the rapid development in aerospace, atomic energy, and other industrial fields, there is an increasing demand for the high-temperature-resistance of electromagnetic wires. In using traditional electromagnetic wires, it is difficult to meet the current temperature-resistance requirements. Therefore, the development of high-temperature-resistant electromagnetic wire has extremely important application value. In this paper, high-temperature-resistant electromagnetic wires are divided into organic insulated high-temperature-resistant electromagnetic wires, organic–inorganic insulated composite high-temperature-resistant electromagnetic wires, and inorganic insulated high-temperature-resistant electromagnetic wires. The method of improving the temperature-resistance level of organic insulated high-temperature-resistant electromagnetic wire is introduced. The selection principle of organic–inorganic and inorganic insulation high-temperature-resistant electromagnetic-wire conductor materials is analyzed. The current research status of organic–inorganic and inorganic insulated high-temperature-resistant electromagnetic wires is reviewed. The technical routes for preparing inorganic insulated high-temperature-resistant electromagnetic wire are compared. Finally, the challenges faced by the current high-temperature-resistant electromagnetic wire are pointed out, and the future development direction of organic–inorganic-composite insulation and inorganic insulation high-temperature-resistant electromagnetic wire is proposed.

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“…Many papers have investigated the effect of adding nanoparticles on the resistance to corona discharge of the PI composites [48][49][50][51]. Zhang found that the honeycomb structure appeared on the aged surface of original film, and crack and some inorganic like substance exhibit on the aged surface of the nano-inorganic hybrid film.…”

Section: Pi Compositesmentioning

confidence: 99%

Review of high thermal conductivity polymer dielectrics for electrical insulation

Xiao

2016

High Voltage

141

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Traditional insulation material is thermally insulating and has a low thermal conductivity. The miniaturisation and higher power of electrical devices would generate lots of heat, which have created new challenges to safe and stable operation of the grid. The development of insulating materials with high thermal conductivity provides a new method to solve these problems. The improvement of thermal conductivity would increase the ability to conduct heat and greatly reduce the operating temperature of the electrical equipment, which could reduce the equipment size and extend service life. On the other hand, inorganic thermally conductive particles and the improved thermal conductivity may have great effect on thermal breakdown. In this study, the factors affecting the thermal conductivity of dielectric polymer composites were explored. Intrinsic thermal conductive polymer and particle-filled thermal conductive composites were discussed. Effect of thermal conductivity, shape, size, surface treatment of the particle and prepare process on thermal properties of the composites were illustrated. This study focused on the electrical and thermal properties of thermally conductive epoxy, polyimide and polyethylene composites. Tracking failure caused by thermal accumulation is a typical thermal breakdown phenomenon. The performance of the resistance to tracking failure was studied for these composites. The results showed that thermal conductive particles improved the resistance to tracking failure. Finally, application of thermally conductive epoxy in electrical equipment was discussed. High Voltage

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Polyamideimide-alumina nanocomposites for high-temperatures

Cited by 9 publications

References 11 publications

Dynamic behavior of surface charge on direct- fluorinated polyimide films

Dynamic behavior of surface charge on direct- fluorinated polyimide films

Research Progress in High-Temperature-Resistant Electromagnetic Wire

Review of high thermal conductivity polymer dielectrics for electrical insulation

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