A. V. Tolkachev, T. V. Druzhinina, and L. A. Nazar'ina UDC 677.494.745.32.021.125.56 The thermal properties of polyvinyl alcohol in the presence of phosphorous-containing and other inorganic compounds were investigated. The catalytic role of a phosphorus-containing fireproofing compounddiammonium phosphate --in thermooxidative decomposition of PVA was revealed. It was found that dehydration of PVA is intensified, the activation energy of decomposition of PVA increases, and its cokeforming power also increases in the presence of (NH4)2HPO 4.

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The work is devoted to development and creation of an optoelectronic complex for determination of the inhomogeneous condensed media parameters, principle of which is based on the method of structured laser radiation caustics. This method is described for determining the parameters of diffusion layer of liquid according to the position of caustic surfaces during longitudinal probing by a plane laser beam. Special software is presented that allows determining the distribution of the refractive index in the diffusion layer of liquid by comparing theoretically calculated and experimental refractograms. The results of the complex operation for the diffusion layer arising between the electrolyte solution and water for different concentrations of the electrolyte solution are shown. New method for determining the temperature of the surface of a cold body placed in a transparent liquid is presented, it is based on determining the location of the singular points of caustic surfaces arising when the boundary layer is probed by the horizontal element of structured beam.