Near-infrared spectroscopy in resin transfer molding—determination of the degree of cure

Moritz Salzmann, Wolfgang Märzinger, Michael Teuchtmann, Bharath Ravindran, Ulrike Kirschnick, Ewald Fauster

Publikation: Beitrag in FachzeitschriftArtikelForschungBegutachtung

Abstract

Near-infrared (NIR) spectroscopy is employed to directly monitor the degree of cure of composite material during the curing phase in the resin transfer molding (RTM) process. The composite material consists of natural fibers and an epoxy-amine resin system. The quantitative determination of the degree of cure, α, from the NIR spectra is realized by partial least square (PLS) regression in conjunction with various pre-treatments of the spectral data. As a reference, the degree of cure is determined by isothermal differential scanning calorimetry (DSC) experiments. The best PLS model that could be obtained for α is characterized by a determination coefficient of prediction (R²P) of 0.980 and root mean square error of prediction (RMSEP) of 4.4 %. While the spectra change during curing according to the literature for each RTM trial, significant differences can be observed between the spectra of different RTM trials. The reasons for this are discussed in detail. The findings show the potential of inline NIR spectroscopy for monitoring α in the RTM process.
OriginalspracheEnglisch
Seiten (von - bis)5557-5565
Seitenumfang9
FachzeitschriftInternational Journal of Advanced Manufacturing Technology
Jahrgang132.2024
Ausgabenummer11-12
DOIs
PublikationsstatusVeröffentlicht - Juni 2024

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