Funtan, A., et. al. Advanced Materials, 2021, https://doi.org/10.1002/adma.202100068
Modern electro-engines are based on resins constituted from poly(esterimides) (PEI), isolating and mechanically separating the copper-wires in enamels. We here report a novel, inline-chemical reporting system to monitor thermal degradation of such thermoset-systems by simple solid state fluorescence measurements, thus allowing to prevent short circuits and thus primoridal destruction of the device. © 2021 The Authors. Advanced Materials published by Wiley‐VCH GmbH