Determination of the glass transition temperature of an epoxy prepreg by Near Infrared Spectroscopy
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In: Polymer Testing, Vol. 125.2023, No. August, 108111, 08.2023.
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TY - JOUR
T1 - Determination of the glass transition temperature of an epoxy prepreg by Near Infrared Spectroscopy
AU - Salzmann, Moritz
AU - Teuchtmann, Michael
AU - Schledjewski, Ralf
N1 - Publisher Copyright: © The Authors
PY - 2023/8
Y1 - 2023/8
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85162167134&partnerID=8YFLogxK
U2 - 10.1016/j.polymertesting.2023.108111
DO - 10.1016/j.polymertesting.2023.108111
M3 - Article
VL - 125.2023
JO - Polymer Testing
JF - Polymer Testing
SN - 0142-9418
IS - August
M1 - 108111
ER -