https://sci.ldubgd.edu.ua/jspui/handle/123456789/9887 2026-04-07T10:57:23Z https://sci.ldubgd.edu.ua/jspui/handle/123456789/14133 Title: Nano-sized polymer-silicate thermal stabilizers of polyvinyl chloride materials Authors: Khromyak, Ulyana; Masyuk, А.; Levytskyi, V.; Katruk, D.; Kulish, B. Abstract: Peculiarities of obtaining and modifying Ba, Zn-containing polymer-silicate thermal stabilizers of polyvinyl chloride have been studied. The influence of macromolecular modifiers on the morphology and surface characteristics of thermal stabilizers is shown. The influence of fine Ba, Zn- containing polymer silicate thermal stabilizers on the processes of destruction (weight loss, thermal effect), physical- mechanical (surface hardness, elasticity) and thermophysical (Vicat softening point) properties of polyvinyl chloride materials is revealed. 2021-11-05T00:00:00Z https://sci.ldubgd.edu.ua/jspui/handle/123456789/14054 Title: Modified densified waste of expanded polystyrene and its blends with polyamide 6 Authors: Khromyak, Ulyana Abstract: The regularities of expanded polystyrene (EPS) waste modi- ed by polyvinylpyrrolidone (PVP) with the simultaneous gas release in various solvents were revealed. The upper sorption limit depends on the nature of the solvent, the concentration and molecular mass of the PVP, the temper- ature of the process, and the apparent density of the EPS. It was established that the sorption limit of PVP increases with increasing of its concentration in the system and decreases with molecular mass increasing. Based on XRD and FTIR analyses, it was determined that materials based on polyamide 6 and EPS modi ed by PVP have an increased crystallinity degree by 10–15%, a smaller average crystallite size and higher technological compatibility. The addition of PVP-modi ed EPS contributes to the increase of the yield strength of polyamide 6 by about 5%–10%. The increase of the Vicat softening point by 5–8 K and the sur- face hardness by 25–30 MPa of materials based on polyam- ide 6 and modi ed polystyrene was investigated. It is caused by the redistribution of intermolecular bonds between the components of the blend under by the effect of a uniformly distributed PVP in the EPS resulting in increased compatibility between the components and the compacted structure. POLYM. ENG. SCI., 00:000–000, 2020. © 2020 Society of Plastics Engineers 2020-01-01T00:00:00Z https://sci.ldubgd.edu.ua/jspui/handle/123456789/14053 Title: Physico-chemical and technological regularities of foam polystyrene degazation in the liquid medium Authors: Khromyak, Ulyana Abstract: The regularities of compaction process of foam polystyrene plastics in the liquid mediums have been discovered. The influence of medium nature, temperature and technological characteristics of foam polystyrene (imaginary density, shredding degree) on the kinetics of gas phase release in the conditions of polystyrene segmental mobility has been determined. The design and method of calculation of the reactor for the process of foam poly- styrene degazation via the continuous scheme is offered 2019-01-01T00:00:00Z https://sci.ldubgd.edu.ua/jspui/handle/123456789/14052 Title: Change of thermophysical properties of polyamides under the influence of polyvinylpyrrolidone Authors: Khromyak, Ulyana 2019-01-01T00:00:00Z