High temperature dielectric properties of Apical, Kapton, PEEK, Teflon AF, and Upilex polymers

Author Daniel Tan summarized the recent advances in dielectric composites with the focused search for the method of enhancing dielectric strength. A SEM image of the polymer composite is presented showing the nanoparticle dispersion and bonding with polymer matrix via an in-situ polymerization synthesis. The defects, electrical charge transport, surface imperfection causing dielectric breakdown may be suppressed by the adequate design of nanoparticle incorporation, core-shell configuration, and filler-polymer interface, which eventually leads to high performance dielectric nanocomposites for capacitors and electrical insulation.ARTICLES 48192 Microfibrillated-cellulose-reinforced polyester nanocomposites prepared by filtration and hot pressing: Bending properties and three-dimensional formability

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“…The breakdown behavior of insulation under these environments is yet not fully understood. [ 69–72 ]…”

Section: Advantages and Challenges Of Polymer Dielectrics—historical mentioning

confidence: 99%

The search for enhanced dielectric strength of polymer‐based dielectrics: A focused review on polymer nanocomposites

Tan

2020

J of Applied Polymer Sci

169

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“…Their photosensitive properties are required for microelec tronic component fabrication: moreover, their high radiation toler ance and mechanical properties allows them to be used for ap plications in space environment. Despite the difficulty of manu facturing due to both insolubility and high-temperature transition, their excellent dielectric strength (from 118 to 300 kV/mm accord ing to previous studies) and their high thermal stability (isother mal degradation is about 0.01 wt %.h-1 at 300 °C} make polyimides suitable for aeronautic applications [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Ageing of polyimide under thermal stress: Relaxational effects and charge transport

Henri

Dantras²,

Lacabanne³

et al. 2021

Polymer Degradation and Stability

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Polyimide is one of the most used polymer for electrical insulation in severe environment. For future aircrafts, polymer electrical insulation will be exposed to thermal constraints that can affect its physic ochemical structure. Effects of thermal ageing are studied through their impact on the relaxational be haviour. Thermal degradation impairs first the aromatic entities and lately the carbonyls. lt is responsible for the strong acceleration of mobility observed for both localised f3 and y relaxation modes. Both DMA and swelling test exhibit an acceleration of localized molecular mobility. However, as the local mobility is accelerated, the increase in heterogeneities visible through the evolution of the MWS polarisation brings up to light a change in the charge transport mechanism. The chain scission degradation mechanism, leads to a decrease of the density of deep traps. lt explains the evolution of both the value of OC conductivity and its activation energy upon ageing.

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“…Polyimide film is commonly used in aviation motors and generators for the slot liner and phase separator. Dielectric properties of polyimide films at elevated temperatures are affected by the thermal stability of the materials [3] . Our previous work [4] has indicated that the breakdown voltage of polyimide film suffers from thermo-oxidative degradation.…”

Section: Resultsmentioning

confidence: 99%

High temperature nanocomposite insulation for high power density machines

Yin

Flanagan

Zhao

et al. 2016

2016 IEEE International Conference on Dielectrics (ICD)

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Increasing demand for higher power, lighter weight and compact power generation systems in aircraft has resulted in the need for a new high temperature insulation system. It requires better thermal capability and improved reliability over the 240 o C system used commercially. A 280 o C insulation system has been developed based on a hybrid organicinorganic material to address these evolving requirements. This electrical insulation system comprises a nanocomposite polyimide wire for windings, and a hybrid slot liner for ground wall insulation. Thermal, electrical and mechanical properties of this insulation system will be discussed.

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High temperature dielectric properties of Apical, Kapton, PEEK, Teflon AF, and Upilex polymers

Cited by 31 publications

References 1 publication

The search for enhanced dielectric strength of polymer‐based dielectrics: A focused review on polymer nanocomposites

The search for enhanced dielectric strength of polymer‐based dielectrics: A focused review on polymer nanocomposites

Ageing of polyimide under thermal stress: Relaxational effects and charge transport

High temperature nanocomposite insulation for high power density machines

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