Abstract
Sizing agents on sized fibre reinforcements were analyzed in situ by means of near-infrared (NIR) light-fibre optics spectroscopy. For the sized aramid knitted fabrics, characteristic NIR bands of epoxy and polyethylene types of sizing agents were superimposed on the spectrum of non-treated aramid fabrics. The spectra of non-treated aramid knitted fabrics and aramid fabrics with the two different sizing agents were clearly distinguished without using any chemometric analysis. In the case of sized glass strand, the formation of an amide bond between maleic anhydride-modified polypropylene binder and an amino silane coupling agent on glass fibers could be monitored by NIR light-fibre optics spectroscopy.
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