By spent researches is established, that the products from a composite material on a basis gypsum and sulfur do not include in the structure potentially dangerous for organism of the person and environment of connections of mercury, thallium, selenium, arsenic; are chemically stable and do not allocate in inducing air, water and acid of environment unstable of inorganic connections. By manufacture of products on air environment of a working zone can be allocated hydrogen sulphide and sulphureous anhydride, that requires the appropriate organization of labour of the workers with maintenance of a premise by compulsory ventilation and measures of fire-prevention safety. Toxicological and hygienic studies of powdered sulfur gypsum material in case of cutaneous admission (50% vaseline emulsion) allowed to establish the following: after the first application of the paste, no visible changes were observed on the skin of animals. After ten applications in 2/3 of the experimental animals, pale pink erythema was observed throughout the paste application area. With further applications, the intensity of skin hyperemia did not increase. The resulting changes can be classified as a moderately pronounced skin irritating effect of powdered sulfur gypsum material. Analysis of the information obtained during the formulation of basophil degranulation reactions and specific agglomeration of blood leukocytes of guinea pigs sensitized with powdered sulfur gypsum material indicates the absence of statistically significant changes in the parameters of the studied reactions in animals of the experimental and control groups. This gives grounds for concluding that sulfur gypsum materials do not possess allergenic activity. Based on the conclusion of the Chief Sanitary Doctor of Ukraine, a composite material based on gypsum and sulfur is recommended for the manufacture of tiles that can be used in the construction of buildings of “B” and “V” groups (industrial and public buildings).

Influence of an external magnetic field on the structure formation and transport properties of polymeric composites based on epoxy and Fe3O4, 3(36), doi: 10.26909/csl.3.2017.4 In this paper, the results of the study of the influence of an external magnetic field on the thermal and electrically conductive properties of composites based on epoxy and magnetite are presented. Different types of fillers or amplifiers have been developed to obtain composite materials with desirable thermal, mechanical and electrical properties. Fillers play an important retrofitting role in improving the efficiency of polymers and production efficiency.The samples of the initial epoxy polymer (EP) and composites based on EP and magnetite (Fe3O4) were obtained. To obtain the samples, an epoxidian oligomer (EDO) based on bisphenol A was used, with a density of 1150 kg / m 3 at a temperature of 293 K (DER 321 trademark of DOW Chemical). As a curing agent for EDO, Polypox H354 (manufacturer of UPPC (Germany)) was used. As a filler, magnetite (Fe3O4) with a density of 5200 kg/m 3 with a conductivity of 10 -4 ÷10 -2 S/m and a particle size of 1÷5 μm was selected. Such samples were formed under the action of an external magnetic field and without it. It is found that the formation of a composite under the influence of an external magnetic field leads to the formation of continuous channels from ferromagnetic particles of Fe3O4 in a continuous matrix of EP. It is established that, despite of the high intrinsic electrical conductivity of Fe3O4, the presence of continuous filler channels does not contribute significantly to the resistivity of composites due to high intercontact resistance within the filler channels. The thermal conductivity in the direction of the orientation of the Fe3O4 particles increases substantially. This means that the electrical conductivity of such composites determines the conductivity of the polymer matrix. At the same time, the specific resistance of the composite of the same gross composition in the direction along the direction of the magnetic field of the filler is much lower, but in absolute value remains rather high.Key words: polymeric composites, magnetic field, thermal conductivity.Вплив зовнішнього магнітного поля на структуроутворення та транспортні властивості полімерних композитів на основі епоксидного полімеру та Fe3O4 -Київський національний університет архітектури і будівництва, Київ, УкраїнаРазработаны различные типы наполнителей или усилителей для получения композитных материалов с желательными тепловыми, механическими и электрическими свойствами. Наполнители играют важную переоснащающую роль в повышении эффективности полимеров и эффективности производства. Получены образцы исходного эпоксидного полимера (ЭП) и композитов на основе ЭП и магнетита (Fe3O4), сформированных под действием внешнего магнитного поля и без него. Обнаружено, что формирование композита под действием внешнего магнитного поля приводит к образованию непрерывных каналов из ферромагнитных частиц Fe3O4 в сплошной матрице ЭП. Уст...