Факультет митної справи, матеріалів, технологій та гостинності
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Item type:Наукова стаття, Intensification of the formation process of sodium sulfate-modified biocomposite materials based on the glutinous matrix(Kharkiv: Institute of Single Crystals of the National Academy of Sciences of Ukraine, 2023) Sadova, Oksana; Kashytskyi, VitaliiThe influence of the modifying additive (sodium sulfate) on the heat treatment regime of the biocomposition in the mold investigated in the article. The optimal content of sodium sulfate in the biocomposite material was determined. The influence of the content of the modifying additive on the compressive strength of biocomposites structured at different temperatures has studied. The optimal parameters of the thermal field temperature and the duration of heat treatment of the biocomposition for the given content of the additive, which provides the maximum values of mechanical characteristics, are determined. It established that the modifying additive with optimal content is able to increase the intensity of structuring of biopolymer binder. This consists in the rapid transition of the glutin binder from the gel state to the solid state with the formation of physicochemical bonds due to the removal of excess moisture under the influence of temperature. Fractograms of the fracture surface of biocomposites containing sodium sulfate analyzed.Item type:Монографія, Properties and formation technology of glutinous biocomposite materials(Boston: Primedia eLaunch, 2023) Sadova, Oksana; Kashytskyi, VitaliiThe monograph presents the general characteristics and classification of biocomposite materials based on natural components, their advantages and scope of application are indicated. The mechanical properties of biocomposite materials based on a glutinous matrix and plant fillers were studied. The content of components was optimized. The formation modes of biocomposites with processing of the composition in physical fields were determined. The technology of recycling glutinous biocomposite products by thermo-mechanical processing of secondary raw materials has been developed. The monograph is intended for specialists in materials science of polymer composites and biocomposite materials. It will also be useful for graduate students, students, materials scientists, technologists and engineers of technical specialties.Item type:Наукова стаття, Оптимізація технології отримання біокомпозитів, наповнених подрібненими стеблами зернових культур(Луцьк: ЛНТУ, 2022) Садова, Оксана ЛеонідівнаPurpose. To optimize the temperature-time modes of heat treatment of highly filled biocomposites based on glutin and chopped stalks of grain crops, formed by the method of hot pressing of the composition. Method. A glutinous solution used as a matrix for the formation biocomposites with a high degree of filling. As a filler used chopped stalks of grain crops in fractions of 0.5 and 0.7, pre-dried for 1 hour at a temperature of 50-60 °C. Biocomposite samples formed by the method of hot pressing of the composition. The compressive strength limit determined by compressing cylindrical samples with a diameter of 20 mm and a height of 40-45 mm using a static load at a speed of movement of the lower traverse of the press of 2 mm/min. Results. The topical direction of modern materials science in the area of composite materials is the development of eco-friendly biocomposites, since the polymer matrix is biodegradable and renewable sources. This direction is new, therefore, it requires the development of the composition and production technology of biocomposites, as well as the study of their properties. In the article, various forming technologies and heat treatment regimes developed in order to increase the strength of highly filled biocomposite materials based on glutin and crushed stalks of grain crops. Scientific novelty. It discovered for the first time that at the last stages of structuring biococomposites, it is necessary to lower the temperature of heat treatment (drying) and increase its duration, which will ensure the avoidance of structural defects (cracks) in the material. The technology of obtaining biocomposite products has been optimized due to the drying of biocomposite materials after the main and additional heat treatment. This complicated the technology of obtaining products from biocomposites, but made it possible to remove excess moisture from the materials. Moisture gets into the material from the glutin solution, which is prepared by pouring bone glue with water, that is necessary for the formation of the composition. Long-term drying of biocomposites at low temperatures ensures uniform gradual removal of moisture from the material without the formation of cracks. The compressive strength of biocomposites produced using this technology is 53.3 MPa. Practical significance. The developed biocomposite materials are biodegradable and environmentally friendly. Therefore, it is advisable to use them for the production of disposable containers, which will solve the problem of waste disposal and improve the ecological safety of the environment.