Modified Densified Waste of Expanded Polystyrene and Its Blends With Polyamide 6
POLYMER ENGINEERING AND SCIENCE
Authors: Levytskyi, Volodymyr; Moravskyi, Volodymyr; Masyuk, Andrii; Kuziola, Rafal; Graz, Katarzyna; Khromyak, Ulyana
Abstract
The regularities of expanded polystyrene (EPS) waste modified 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 temperature 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 modified by PVP have an increased crystallinity degree by 10-15%, a smaller average crystallite size and higher technological compatibility. The addition of PVP-modified 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 surface hardness by 25-30 MPa of materials based on polyamide 6 and modified 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., 2020. (c) 2020 Society of Plastics Engineers
COST BREAKDOWN OF RUSSIAN STATE DEFENSE ORDER PROCESSES FOR R&D WORKS
INTERNATIONAL TRANSACTION JOURNAL OF ENGINEERING MANAGEMENT & APPLIED SCIENCES & TECHNOLOGIES
Authors: Zubova, Lyudmila; Davydyants, David; Yakovleva, Anna; Miskhozhev, Eldar; Gaidai, Petr
Abstract
In this article, for the first time, a methodological approach has been developed for the formation of the aggregate cost of the economic risk of the State Defense Order, which allowed us to develop a methodology for the formation of the aggregate cost of the state defense order process (SDO) taking into account risks. An approach to the segmentation of public defense processes into risky and risk-free conditions is proposed. The classification of the total cost of the state defense order process (SSprots.goz) for risky and risk-free conditions of public defense was developed. The classification of the total cost of the State Defense Order process in risky and risk-free conditions will reflect the budget spent taking into account the risky and risk-free stages of the life cycle of rocket-karmic equipment. Disciplinary: Risk Analysis, Military Studies. (c) 2020 INT TRANS J ENG MANAG SCI TECH.