PSI - Issue 40

S.N. Danilova et al. / Procedia Structural Integrity 40 (2022) 118–123 S.N. Danilova, A.A. Dyakonov, A.P. Vasilev, A.A. Okhlopkova / Structural Integrity Procedia 00 (2022) 000 – 000

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4. CONCLUSION As a result of the conducted research, it was found that the optimum time for mechanical co-activation is equal to 20 minutes. These composites are characterized by the enhancement of the tensile strength by 14 % and the elastic modulus by 19 % with retaining of the relative elongation at the level of the original polymer. It has been shown that such change in properties of the material is due to the changes of the supramolecular structure of the composites. Structural examinations with the use of electronic microscopy testify to retaining of the spherulitic structure of the PCM, which had been produced by the methods of mechanical co-activation. It was discovered that the increase in the duration of the mechanical co-activation of UHMWPE and BF results in decrease of the spherulite dimensions. Examinations of the rupture points have shown that modifications of BF contribute to the increased adhesion of the fibers to UHMWPE at the phase boundary owing to penetration of the macromolecules into the microcracks on the surface of the fibers that are created after mechanical activation. Acknowledgements The article was prepared within the framework of the implementation of the state assignment for the implementation of scientific research by laboratories under the guidance of young, promising researchers in the framework of the implementation of the national project "Science and Universities" No. 121112400007-5. References Wannasri, S., Panin, S.V., Ivanova, L.R., Kornienko, L.A., Piriyayon, S., 2009. Increasing wear resistance of UHMWPE by mechanical activation and chemical modification combined with addition of nanofibers. Procedia Engineering 1. 67-70. Selyutin, G.E., Gavrilov, Y.U., Voskresenskaya, E.N., Zakharov, V.A., Nikitin, V.E., Poluboyarov, V.A., 2010. Composite materials based on ultra high molecular polyethylene: properties, application prospects. Chemistry for Sustainable Development 18(3), 301-314. Panin, V.E., Panin, S.V., Kornienko, L.A., Vannasri, S., Ivanova, L.R. , Shil’ko , S.V., 2010. Effect of mechanical activation of ultra-high molecular-weight polyethylene on its mechanical and triboengineering properties. Journal of Friction and Wear 31(2), 121-127. Samuels, R.J., 1967. Spherulite structure, deformation morphology, and mechanical properties of isotactic polypropylene fibers. Journal of Polymer Science Part C: Polymer Symposia 20(1), 253-284. Panin, S.V., Shilko, S.V., Kornienko, L.A., Chernous, D.A., Aleksenko, V.O., 2017. Biomechanical properties of dispersep article reinforced polymer composites on ultrahigh molecular weight polyethylene (UHMWPE). MOJ App Bio Biomech 1(5), 192-199.