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

Research output: Contribution to journalArticleResearchpeer-review


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.
Original languageEnglish
Pages (from-to)5557-5565
Number of pages9
JournalInternational Journal of Advanced Manufacturing Technology
Issue number11-12
Publication statusPublished - Jun 2024

Bibliographical note

Publisher Copyright: © The Author(s) 2024.


  • Bio-composite
  • Degree of cure
  • Near-infrared spectroscopy
  • Resin transfer molding

Cite this