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1. Polyolefin-Based Multilayer Packaging Material Modified by Ethylene Propylene Copolymer in Food Storage

Author

Tveritnikova I., Kirsh I., Pomogova D., Bannikova O., Beznaeva O., and Romanova V.

Subjects
multilayer polymeric materials, copolymer, coextrusion, rheological and physico-mechanical properties, Food processing and manufacture, TP368-456
Abstract

The research features a comprehensive study aimed at increasing the technological compatibility of multilayer packaging materials. The paper describes a recycling technology with the prospect of returning the resulting secondary raw materials to the production cycle. The research included the following tasks: to conduct a comprehensive study of polyolefin mixtures modified by ethylene propylene copolymer; to study the effect of the copolymer on the rheological and physicomechanical properties of polymer compositions; to propose a technology for the recycling of secondary polyolefin mixtures. The research involved the following methods: the capillary viscometry method was used to determine the rheological properties of polymer compositions; the tensile test method was employed to define the physicomechanical properties of the compositions; the pycnometric method was used to assess the density of the mixtures. The study featured such polymers as polyethylene, polypropylene, and ethylene-propylene copolymer, which was chosen as a link between the polymers. The authors obtained polymer compositions in various ratios of polyethylene, polypropylene, and ethylene-propylene copolymer: 70:30:0; 68.5:28.5:3; 65:25:10; 30:70:0; 28.5: 68.5: 3; 25:65:10. The article describes the process of modifying polyolefin compositions based on polyethylene and polypropylene by ethylene-propylene copolymer on a single-screw extruder. The authors defined the rheological properties and the deformation-strength characteristics of the polymer mixtures. Repeated processing proved to lead to a decrease in the physicomechanical properties of polyolefin mixtures, with the exception of compositions based on polyethylene and polypropylene in the ratio of 30:70, where the breaking stress increased. The number of processing cycles increased the melt flow rate of the mixtures. The proposed technology is meant for producing multilayer packaging materials using packaging waste in the middle layer for contact with food.

Published
2019
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10. Features of the formation of hot dense plasma in X-pinches on current generators based on low-inductive capacitors.

Author

Shelkovenko, T. A., Tilikin, I. N., Mingaleev, A. R., Romanova, V. M., and Pikuz, S. A.

Subjects
SOFT X rays, DENSE plasmas, PULSE generators, PLASMA currents, HIGH temperature plasmas
Abstract

The paper presents the results of experimental studies of the operation of hybrid X-pinches on a modified high-current KING generator. The KING generator is a portable pulse current generator based on four low-inductive pulse capacitors. The output assembly of the generator was modified for greater diagnostic access to the load, which led to an increase in the inductance of the entire circuit and an increase in the duration of the current rise. A series of experiments with hybrid X-pinches with Al, Cu, and Mo wires with a diameter of 25 μm was carried out on the modified KING generator (200–260 kA, 220–280 ns, 45 kV). In experiments, it was shown that such a modification of the generator led to the stable formation of bright soft x-ray sources in X-pinches, suitable for use in point-projection radiography with a spatial resolution of about 10–15 μm. [ABSTRACT FROM AUTHOR]

Published
2024
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13. Laser scattering by submicron droplets originated during the electrical explosion of thin metal wires

Author

Romanova, V. M., Ivanenkov, G. V., Parkevich, E. V., Tilikin, I. N., Medvedev, M. A., Shelkovenko, T. A., Pikuz, S. A., and Selyukov, A. S.

Subjects
Physics - Applied Physics, Condensed Matter - Other Condensed Matter, Physics - Optics
Abstract

This paper presents the results of studying of dispersed media formation during the electrical explosion of thin metal wires in vacuum by using low-current generators ($\sim 1$-$10$~kA). Particular attention is paid to the analysis of the composition and structure of the corresponding explosion products as well as to the problem of their visualization using simultaneous laser interferometry and shadow imaging at two wavelengths (1.064~$\mu$m and 0.532~$\mu$m). Our findings point to the fact that the important role in the visualization of the explosion products belongs to multiple scattering by submicron droplets of dense condensed matter, which are mixed with metal vapor. The hypothesis on the existence of submicron droplets in the products of exploding metal wires correlates with the results obtained by soft x-ray radiography combined with a laser probing technique. Taking into account the multiple scattering by submicron droplets, it is possible to significantly clarify the parameters of the explosion products visualized via laser probing techniques as well as to gain a deeper insight into the physics behind the electrical wire explosion., Comment: 8 pages, 5 figures Changes: 1. 1st page: text was removed "(Dated: December 1, 2020)" - this (compilation) date do not relate to the submission date; 2. 7th page: the acknolegment section was changed. 3. 3rd page: width of the 1st figure was changed from 15.5 cm to 15.6 cm (corrected structure of preprint)

Published
2020

33. Exploding foils with artificial structure as a source of ultraviolet radiation.

Author

Tilikin, I. N., Shelkovenko, T. A., Pikuz, S. A., Oginov, A. V., Mingaleev, A. R., Romanova, V. M., and Ter-Oganesyan, A. E.

Subjects
RADIATION sources, PINHOLE cameras, LASER engraving, MICROCHANNEL plates, PULSE generators
Abstract

The results of the study of radiation produced by the electrical explosion of Al foil with a thickness of 4 μm with an artificial periodic structure of periodic holes with 50–400 μm steps created by laser engraving are presented. The experiments were carried out on a KING pulse high-current generator (220 kA, 40 kV, 300 ns). Images of exploded foils were recorded using pinhole cameras with a 20 μm aperture on a four-frame microchannel plate camera with 5 ns temporal resolution. In experiments on the electrical explosion of thin foils, it was shown that the application of an artificial periodic structure to the foil leads to a much more uniform radiation in the UV spectrum range along the entire length and width of the foil. Uniform radiation was observed from 20 to 70 ns. It is shown that such radiation can be used for the imaging of test objects or plasma objects like exploded wires. [ABSTRACT FROM AUTHOR]

Published
2023
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