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Abstract
The ageing of the adhesive A-45K, a vinyl acetate-acrylate copolymer used for supporting silk artefacts for 20 years, has been investigated under natural and accelerated light ageing conditions. Changes in the structure and morphology of the polymer were assessed by scanning electron microscopy (SEM) and attenuated total reflectance Fourier transform infrared spectroscopy (ATRFTIR). The SEM method revealed not only changes in the adhesive film, but also changes in the silk fibre itself. Changes in the chemical structure were determined by FTIR difference spectra, normalizing the subtraction procedure according to the leastchanging absorption bands of the adhesive at 1161 cm−1 or 2849 cm−1. The simultaneous increase of negative bands in difference FTIR spectra associated with the vibrations of methyl, C=O, and C–O–C groups provide evidence of the preferential degradation of the acetate segments in both the naturally and artificially aged copolymers.
Published Version
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