The UV-induced crosslinking of a pressure sensitive adhesive based on an acrylic resin with copolymerized benzophenone groups was studied by real-time FTIR-ATR spectroscopy in order to simulate technical curing processes. The dependence of the conversion on the applied UV dose was investigated by irradiation with single or multiple UV pulses and with variable light intensities. Depth profiling of the degree of cure during the UV curing of thick adhesive coatings revealed a strong gradient of the conversion due to the inner filter effect of the photoreactive groups. Temperature was found to have a significant influence on cure rate and conversion. Results from FTIR spectroscopy were related to the adhesive properties of the cured coatings.
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Scherzer et al. (2002) studied this question.
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