PSI - Issue 20

Petukhova E. S. et al. / Procedia Structural Integrity 20 (2019) 75–80 Petukhova E. S. and Fedorov A. L./ Structural Integrity Procedia 00 (2019) 000 – 000

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It was found that the nature of the submolecular structure of the composites depends on the storage conditions. It can be seen that the original polyethylene as well as composites containing stabilizers СО 3 and СО 4 after 18 months of exposure are characterized by large sizes of submolecular formations in comparison with the control samples of similar composition. The structure of composites stabilized by Stafen is characterized by distinct morphological heterogeneities both in size and in the form of submolecular formations. Thus, the change of the composite properties under the climatic conditions is caused by the transformation of the submolecular structure of the polymer into larger formations or by the formation of heterogeneous structure of the material leading to embrittlement. 4. Conclusion The climate resistance tests of composite materials based on polyethylene of grade 273-83 showed that the efficiency of stabilizers is determined by their working resource related to the peculiarities of their consumption over time. The addition of stabilizers of grades CO3, CO4 in the amount of 0.3-0.5 wt.% maintains the mechanical characteristics of the unpainted polymer material under continuous exposure of climatic factors for 12 months, which is 3 months more than the working resource of the original polyethylene and polyethylene containing stabilizer Stafen. Thus, the addition of stabilizers to polyethylene using for industrial products under the conditions of the Yakutia (or other regions with similar climatic conditions) will increase their service life by at least 25%. 5. Acknowledgments This work was performed according to the state order 0377-2018-0001. 6. References Yousif, E., Haddad, R., 2013. 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