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COMPUTER HYDROMECHANICS, 2024 (Program, Abstracts)
IX International Scientific & Practical Conference "Computer Hydromechanics"
HYDRODYNAMICS AND ACOUSTICS
2021 ◊ Volume 2 (92) ◊ Issue 1 ◊ p. 30-40
B. B. Kolupaev*, B. S. Kolupaev**, . V. Klepko***, V. V. Levchuk**, A. Ya. Bomba**
* Institute of Cybernetics at the Academician Stepan Demianchuk International University of Economics and Humanities, Rivne, Ukraine
** Rivne State University of Humanities, Rivne, Ukraine
*** Institute of Macromolecular Chemistry of NAS of Ukraine, Kyiv, Ukraine
The internal pressure of a Polyvinyl Chloride filled with graphite nanopowder
Gidrodin. akust. 2021, 2(1):30-40
TEXT LANGUAGE: Ukrainian
ABSTRACT
Heterogeneous systems formed by adding nano-dispersed impurities to the polymer base can be considered promising composite materials. Their non-standard physical and mechanical characteristics are directly related to the polymer macromolecules and nanodispersion inclusions interaction at the atom-atom level. In particular, deformation processes in amorphous polymers begin with the nucleation of local non-polymeric inelastic deformation carriers in terms of structure and scale. During the deformation of such systems, an excess internal energy is known to accumulate. This last is not spent on conformational transformations in the chains of macromolecules and can be described in terms of internal pressure. Given the insufficient development of physical and mathematical models of the formation of the properties of the considered composites, a semi-empirical approach using experimental data plays an important role here. The article presents the results of the study of the internal pressure of nanodispersion heterogeneous systems obtained based on Polyvinyl Chloride (PVC) at a frequency of 0.4 MHz in the temperature range from 298 K to 353 K with the content of nano-dispersed graphite up to 0.5 vol.%. Based on the structural-statistical model using the energy approach, an analytical relationship is proposed for determining the temperature dependence of internal pressure of PVC systems; their relaxation times; Young's dynamic moduli, shear, and bulk deformation; thermophysical properties. Ways of building a technological process for creating such composites and their use in dynamic mechanical and temperature fields are indicated. Based on the Maxwell-Alfrey model, an analytical relationship for determining the internal pressure is obtained. This parameter is formed by the forces of interaction between the elements of the composite structure, so it has a relaxation nature. The nano-dispersed graphite is shown to exhibit maximum activity at a content of 0.1 to 0.3 vol.% in the composite.
KEY WORDS
internal pressure, structure dynamics, nano-particles, Maxwell relaxation, cybernetic system