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

Moritz Salzmann, Michael Teuchtmann, Ralf Schledjewski

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Abstract

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.

Original languageEnglish
Article number108111
Number of pages8
JournalPolymer Testing
Volume125.2023
Issue numberAugust
Early online date14 Jun 2023
DOIs
Publication statusPublished - Aug 2023

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