Experimental verification of the mechanism of mass transfer in liquid photopolymerizable compositions using Fourier-transform infrared-spectroscopy

We propose a technique for the experimental verification of the mechanism of mass transfer in a layer of liquid photopolymerizable composition (LPC), which is based on measuring the absorption spectrum of the LPC film in different parts of the surface using Fourier-transform infrared-spectroscopy. As a result of the spatial modulation of the degree of polymer conversion, a diffusion process is initiated in the LPC layer, leading to the mass transfer and the formation of a relief on the sample surface. The possibility of determining the spatial conversion of the polymer in the LPC layer by Fourier transform infrared spectroscopy is demonstrated.