The work is aimed at creating polymer composite materials with desired properties. One of the ways to create such materials is to create gradient layers characterized by a smooth spatial change (gradient) of properties in the direction of one or two coordinate axes. The results of studies on the rotation of the polymer composition at the time of polymerization are shown. A device for producing polymer composite materials with a gradient layer has been created. The values of the distribution of additives and hardness along the height of the samples are given. Mathematical processing of the experimental results was carried out.
The paper presents the results of studies on the recycling of waste polymer materials foundry, in particular the analysis of the solubility of polymer plates RAKU-TOOL, used for the manufacture of foundry pattern equipment. It has been found that RAKU-TOOL WB-1404 undergoes dissolution in toluene and acetic acid and swells noticeably in nitric acid. RAKU-TOOL MB-0720 reacts with acids and xylene, but does not react with toluene. RAKU-TOOL WB-1000 reacts noticeably only with nitric acid and does not react with toluene or xylene. The results obtained can be used for further processing and return to the production of model equipment, or to other industrial products for machine-building or household purposes.
The work is devoted to the study of the effect of vibration on the creation of a gradient layer in cast polymer composite materials. The influence of vibration frequency and vibration exposure time on the distribution of filler particles in a polymer matrix has been studied. The presented results can be used in the manufacture of cast parts for the needs of mechanical engineering from polymer composite materials with an increased content of particles of the dispersed phase.
Investment casting has always been referred to as mass casting. This circumstance is associated with the high cost of moulds. The paper deals with materials from polymer composite materials for the manufacture of moulds. Investigations of thermophysical properties of polymer composites under cyclic loads under heating-cooling conditions have been performed. The results obtained have been implemented in real industrial production and can be used for one-off production with a significant reduction in the cost of tooling and, as a consequence, castings.
The paper presents the results of studies of thermophysical properties: heat capacity, thermal conductivity, thermal diffusivity and heat storage ability of polymeric polymer composite materials. A method is proposed for determining these properties, based on the well-known method for determining thermophysical properties by eliminating variables. The experimental values of the thermophysical properties of polymer composite materials with the addition of powder particles of various fractions of aluminium, iron, carbon and copper are obtained. The effectiveness of the proposed method is shown by comparing the known values of the specific heat and thermal conductivity of polyurethane with experimental.
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