New organophosphorus compounds based on elemental phosphorus were investigated as fl ame retardants for plasticised polyvinyl chloride. At present, polymeric materials are widely used in building, in industry, and in the home. The worldwide production of these materials has grown fourfold in recent years, while the volume of their use, for example in building, has risen eightfold. This is due not only to the unique physicomechanical properties but also to the architectural and constructional characteristics of polymeric materials [1-4]. Polymeric materials are classifi ed according to different criteria: • the type of polymeric material (polyvinyl chloride, polyethylene, polypropylene, etc.);

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The paper describes a digital system for designing matrixes of self-regulating heating cables, consisting of the following subsystems: prediction of the electrically conductive properties of the matrix, prediction of the deformation-strength properties of the matrix, mathematical modeling of the relationship "composition-technology-properties", multifactorial modeling of the structure, 3D modeling of the composite semiconductor matrix, formation Database. The functionality of each subsystem is considered and their necessity is substantiated in the design of polymer composite materials with a positive thermal coefficient of electrical resistance. The possibility of both creating new semiconductor composite materials and selecting known compositions to meet specified technical requirements is substantiated.

In the present work we have studied the thermal stability, flammability, and fume evolution of epoxy matrix composites with different types and amounts of hardeners, fillers, plasticizers, and fire retardants. It is shown that chemical composition of fillers has little effect on the flammability of epoxy composites when the content of mineral fillers is less than 45 % by mass. Smoke formation decreases linearly with increase of the filling degree. It is shown that to obtain low-combustible materials the oxygen index should exceed 31 %. It was found that the optimal concentration of industrial brominated fire retardants is 8-10 % by mass. To reduce the flammability of epoxy composites, additive brominated fire retardants in the form of a solution in N,N-dimethyl-2,4,6-tribromoaniline have been proposed. The high efficiency of acetyl-and α-hydroxyethyl ferrocene as a smoke suppressor of epoxy composites is shown.