ABSTRACT
The polymers of the di(methyl)acrylates are used in production of optical and medical materials.1 The process of three-dimensional polymerization of di(methyl) acrylates is characterized by the range of factors, which are qualitatively explained by the micro heterogeneous model. 2 The quantitative interpretation of these processes was introduced in paper [3) under the following assumption: -the rate of the three-dimensional polymerization is the sum of the rates of
the homophase and heterophase process. The homophase process occurs in the volume of liquid oligomer, and the heterophase process is occuring in the interphase layer of the solid polymer-liquid oligomer in the regime of the gel-effect. The cut-off rate is controlled by the rate of its growth;
<)ligomer in solid polymeric matrix have a fractal structure. Interpretation of the suggested kinetic model for the variant of the photoinitiated polymerization, with regards to the gradient of illumination in the layer of
photoinitiated composition, concentration gradient of photoinitiator and conversion of the monomer.4 Here the theoretical model of the process is compared with the experimental data on photopolymerization MDF-2, (M-[O(CH2--cH20)zqo)4lf4_ -c(0))2-o-(CH2---cH20)2-M, where M---cH=qCHJ)-c(O)-). This data were obtained over a wide variation of the initiator concentration (co), the intensity of the UV -illumination (10), and thickness of the layer of the polymerization composition (l). It is established that the kinetic model aUows description of the process of three-dimensional polymerization up to the extreme extents of the transformation, based on a four parameters molar coefficient of extinction of photoinitiator (e), the quantum yield of its decomposition ('y), the rate constants of homoand heterophase processes (see Table 1).
