Filamentary electrical conduction in polyimide films detected by infrared thermography before thermal breakdown
| Autor: | Sombel Diaham, Thierry Lebey, Guillaume Belijar, Marie-Laure Locatelli |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
010302 applied physics
chemistry.chemical_classification Materials science Physics and Astronomy (miscellaneous) Infrared Analytical chemistry Thermosetting polymer Hot spot (veterinary medicine) 02 engineering and technology Polymer 021001 nanoscience & nanotechnology Thermal conduction 01 natural sciences chemistry Electrical resistivity and conductivity 0103 physical sciences Thermography Composite material 0210 nano-technology Polyimide |
| Zdroj: | Applied Physics Letters. 110:162902 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/1.4980844 |
| Popis: | An experimental evidence of filamentary electrical conduction existence in polyimide (PI) films under DC voltage just prior to thermal breakdown is reported. This was achieved by real-time surface temperature mapping of PI-metallized samples initially at 300 °C using fast infrared thermography coupled to current-voltage measurements until the breakdown. The transition from a full-electrode conduction to a filamentary conduction is clearly identified through the detection of a localized hot spot within the PI samples in the last 100–150 ms before breakdown. A conduction path, with values inferior to 500 μm in the few ms before the breakdown, was estimated leading to temperature rising up to 100 K above the initial temperature. This work confirms the existence of a filamentary conduction in thermoset polymers prior thermal breakdown. |
| Databáze: | OpenAIRE |
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