Electrothermal lifetime prediction of polyimide wire insulation with application to aircraft

Hondred, Peter R.; Bowler, Nicola; Kessler, Michael R.

doi:10.1002/app.39304

Cited by 9 publications

(7 citation statements)

References 19 publications

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“…If parallel lines are found as the conversion progresses, it tends to mean that a single process is in operation, with unchanged activation energy. From the progression of the lines with the conversion degree [10], it can be deduced that degradation of PFA is rather a slightly retarded process.…”

Section: B Kinetic Analysismentioning

confidence: 99%

Thermal Degradation Kinetics of High Temperature Polymers for Aeronautic Cables Insulation

Teyssèdre¹,

Dinculescu²,

Roy³

et al. 2021

2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM)

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The perspective of increasing on board power on aircrafts leads to reconsider cable technologies, among which insulation processing. In this work, the thermal stability of three materials, Polyimide, Polytetrafluoroethylene and perfluoroalkoxy (PFA) is investigated. Based on a multi-step degradation model applied to thermogravimetric analysis curves, isothermal degradation curves are predicted. Outstanding thermal stability is anticipated for PFA on a chemical standpoint. With the advantage of being a extrusion-processable polymer, PFA constitutes therefore an excellent candidate for high performance cables with extruded insulation.

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Section: B Kinetic Analysismentioning

confidence: 99%

Thermal Degradation Kinetics of High Temperature Polymers for Aeronautic Cables Insulation

Teyssèdre¹,

Dinculescu²,

Roy³

et al. 2021

2021 IEEE International Conference on the Properties and Applications of Dielectric Materials (ICPADM)

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“…The thermal degradation of the widely used Kapton ® film mainly generates CO2 from various sources (initial hydrolysis of the imidic units, followed by decarboxylation of the resulting acidic group), CO, and other volatiles from further transformations of imidic and aromatic moieties (a total of five degradation steps with variable activation energies) [141][142][143][144].…”

Section: Thermal (Oxidative) Degradationmentioning

confidence: 99%

New High-Performance Materials: Bio-Based, Eco-Friendly Polyimides

Rusu¹,

Abadie²

2021

Polyimide for Electronic and Electrical Engineering Applications

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The development of high-performance bio-based polyimides (PIs) seems a difficult task due to the incompatibility between petrochemical-derived, aromatic monomers and renewable, natural resources. Moreover, their production usually implies less eco-friendly experimental conditions, especially in terms of solvents and thermal conditions. In this chapter, we touch some of the most significant research endeavors that were devoted in the last decade to engineering naturally derived PI building blocks based on nontoxic, bio-renewable feedstocks. In most cases, the structural motifs of natural products are modified toward amine functionalities that are then used in classical or nonconventional methods for PI synthesis. We follow their evolution as viable alternatives to traditional starting compounds and prove they are able to generate eco-friendly PI materials that retain a combination of high-performance characteristics, or even bring some novel, enhanced features to the field. At the same time, serious progress has been made in the field of nonconventional synthetic and processing options for the development of PI-based materials. Greener experimental conditions such as ionic liquids, supercritical fluids, microwaves, and geothermal techniques represent feasible routes and reduce the negative environmental footprint of PIs' development. We also approach some insights regarding the sustainability, degradation, and recycling of PI-based materials.

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“…Most of aeronautic cables are made of a combination of PI and of fluorinated polymers such as PTFE, providing the insulation respectively with high thermal and electrical insulation properties [9,10] and resistance to arc tracking and fire propagation. Figure 1 shows an example of cross-section of a cable used for power transmission in aircraft.…”

Section: Investigated Materialsmentioning

confidence: 99%