Speaker
Description
Monitoring and detection of local over-temperatures in temperature-critical electronic devices is vital to ensure the proper operation and safety of individual components or complex systems. The use of thermo-responsive polymeric coatings is considered as a potential solution to register an overheating of the device. For this purpose, a functional polymer coating must release tracer gases at a defined critical temperature which can be detected by low-cost metal oxide (MOx) gas sensors.
The present work focuses on the development of coating formulations with thermally activated functional groups or additives that are able to release tracer gases in two different approaches. First, the implementation of azo compounds, which decompose into volatile products at very well-defined temperatures, is investigated. A second approach is the introduction of thermally labile functional groups in polyurethane-based coatings that are cleaved and later detected by MOx gas sensors when reaching the specific temperature.
Based on a project defined critical temperature in the range of 80-120°C, different coating formulations are prepared and the thermal behaviour of the formulations by techniques such as differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA) and thermal desorption coupled to gas chromatography mass spectrometry (GC-MS). The release of tracer gases at the measured temperatures and suitability of the coatings is validated using a set-up consisting of a heating chamber connected to MOx sensors.
| Speaker Country | Spain |
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