PSI - Issue 59

Mykola Riabchykov et al. / Procedia Structural Integrity 59 (2024) 259–264 Mykola Riabchykov et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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1. Introduction Porous polymer materials are dynamically developing and being introduced in different ways. The use of polyurethane foam provides high efficiency in various industries (Han et al (2023)). There is an improvement in many physical characteristics, but problems related to strength appear (Zhao et al (2021)). In the study of Bridjesh et al. (2023), the positive influence of porous structures on indicators of dynamic strength, in particular impact resistance, was proven. The study of Imam Robit et al. (2023) was devoted to the problems of the strength of non-homogeneous structures, while the parameters of natural non-homogeneous materials were determined. Problems of the destruction of polymeric materials related to their structure are considered by Liu et al. (2023). Special methods of testing the strength of porous polymer materials were developed by Kodaira et al. (2022). The strength of polymer materials with non-discontinuous structures is considered by Marsavina et al. (2023). The research was conducted mainly in the theoretical direction with the determination of the energy of destruction of the samples. A mathematical model for stress state analysis in materials with a complex structure is presented by Jivkov et al. (2023). Damage modeling in porous structures is given by Nguyen et al. (2023). The models consider the heterogeneity of deformations around pores. The strength of porous polymeric materials is provided by their structure and has rather complex directions for modeling (Mikulich (2023), Shvabyuk and Mikulich (2021)). Ensuring the necessary parameters of porosity should significantly affect strength. Provision of the necessary microporous structure by means of ion activation is proposed by Zhu et al (2023). The process of aggregation of nanoparticles in a porous medium was studied by Nguyen et al (2023). More attention was paid to the formation of the structure without determining the strength parameters. Porous structures of a given structure are provided by mechanical means of adding powder materials (Li (2022)). Technologies for creating porous materials with the use of nanoparticles have gained special relevance in recent times. At the same time, the properties of materials, in particular strength and elasticity, can change radically. Ascione et al. (2023) examined the strength of structures using nanotechnology, although only construction materials are considered in this study. In a study by Jiang et al (2023), a porous framework containing nanoparticles was investigated. Ibadat et al. (2021) developed nanotechnology for creating polymers with a given structure of interconnected pores, which positively affects strength. Davino et al. (2021) demonstrate the possibility of creating a smart polymer foam based on the use of magnetic particles. In this way, it is possible to state the perspective of the introduction of magnetic nanotechnologies in the creation of porous and foamed materials. At the same time, the question of the influence of such nanocomponents on their mechanical characteristics remains undeveloped. The purpose of the research is to determine the strength properties of foamed polymers with the content of magnetic nanocomponents based on bivalent and trivalent iron, taking into account the structural effects of the obtained materials. 2. Materials and methods Polyurethane foam was used for research. The basic production technology includes the use of a base with the inclusion of foaming agents. The original technology of using magnetic nanocomponents involves the preliminary creation of a mixture of divalent and trivalent ferrum. This process includes reactions based on ferrous sulfate and ferric chloride. Depending on the reaction modes, nanostructures of a mixture of oxides of divalent and trivalent iron can provide certain nanosized particles (Fig. 1, Riabchykov et al (2023)).