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D. Bieliński, P. Głąb, L. Ślusarski

FT-IR ATR spectra and nanohardness measurements

as used to follow the progress in photocuring of polyester resins

Polimery 2001, No 7-8, 494




Summary

Photocuring of a polyester resin layer 1.0-3.5 µm thick was followed in terms of FT-IR ATR spectroscopy and nanoindentation measurements. The hardness of the coating was reaffirmed to be related to exposure time (Fig. 3). FT-IR spectra showed the photocuring of the resin to follow the mechanism involving copołymerization of an oligoester with styrene (Fig. 4). FT-IR data were found to be well correlated (Re2 > 0.95) with nanoindentation data (Fig. 5). The curing degree disclosed a surface gradient (Fig. 3a), impossible to detect by conventional hardness measurements. This gradient continued to be maintained in the course of the curing reaction, a fact of possible consequence for polymer coating durability. By being focused on surface layer features, the nanoindentation technique provides valuable data that so far were underestimated by polymer technology.
Keywords: polyester resins, surface layer, nanohardness (nanoindentation) measurements, photocuring, FT-IR ATR spectra
D. Bieliński, P. Głąb, L. Ślusarski (413.1 KB)
FT-IR ATR spectra and nanohardness measurements as used to follow the progress in photocuring of polyester resins