Determination of the glass transition temperature of an epoxy prepreg by Near Infrared Spectroscopy

Moritz Salzmann, Michael Teuchtmann, Ralf Schledjewski

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung


An aged epoxy prepreg's glass transition temperature (Tg) is determined using Near Infrared Spectroscopy (NIRS). A miniaturized Near Infrared (NIR) spectrometer and a full-scaled FTNIR spectrometer are used for Tg determination and different measuring setups are tested for the miniaturized spectrometer. Partial least square (PLS) regression is used to develop calibration models by utilizing different spectral pretreatments. It is shown that with the miniaturized spectrometer and a suitable measurement setup, PLS model qualities similar to those of the FTNIR spectrometer can be achieved in cross-validation (CV), with a determination coefficient of CV (R 2CV) of about 0.97 and a root mean square error of cross-validation (RMSECV) of approx. 0.7 °C in the measuring range between 25 °C and 42 °C. Cost-effective, miniaturized NIR spectrometers are thus a suitable technology for the quality assurance of prepregs.

FachzeitschriftPolymer Testing
Frühes Online-Datum14 Juni 2023
PublikationsstatusVeröffentlicht - Aug. 2023

Bibliographische Notiz

Funding Information:
This research was funded by the Austrian Federal Ministry for Climate Action, Environment, Energy, Mobility, Innovation and Technology ( Bundesministerium für Klimaschutz, Umwelt, Energie, Mobilität, Innovation und Technologie, BMK ) in the framework of the program “Production of the Future” (“Produktion der Zukunft”) , and administrated by Austrian Research Promotion Agency ( FFG ), grant number 883906 . The prepreg used in this project was kindly provided by Isovolta AG.

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© The Authors

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