Saransk, Saransk, Russian Federation
Nacional'nyy issledovatel'skiy Mordovskiy gosudarstvennyy universitet im. N.P. Ogareva (Kafedra stroitel'nyh konstrukciy, Professor)
Saransk, Saransk, Russian Federation
Saransk, Saransk, Russian Federation
Saransk, Saransk, Russian Federation
UDK 620.17 Испытания механических свойств материалов. Механические испытания
The paper provides the results of studying the effect of the moisture state of epoxy polymers on the change in their elastic-strength parameters during natural climatic aging in a temperate continental climate. The object of the study was a polymer material based on Etal-247 modified epoxy resin and Etal-45M hardener. Based on the results of the studies, we determined the similarity of the curves of the change in the tensile strength of the samples under tension in the limiting equilibrium-moisture states (dried and moisture-saturated). Depending on the duration of natural climatic aging, the range of variation in the tensile strength of samples in extreme moisture conditions is from 14 to 33% of the tensile strength in the dried state. The synergistic effect between irreversible structural changes in the polymer matrix under the effect of environmental factors and adsorbed moisture has been identified and quantified, which is expressed both in the expansion and contraction of the reversible moisture range effect. It has been established that for the late stages of natural climatic aging of epoxy polymer samples based on Etal-247 epoxy resin and Etal-45M hardener, a point of maximum elongation under tension does not coincide with the point corresponding to the dried state.
polymer materials, epoxy polymers, deformation curves, damage accumulation, fractal analysis, minimal coverage method
1. Dehbi Abdelkader, Abdel-Hamid I. Mourad & Amar Bouaza (2011) Degradation assessment of LDPE multilayer films used as a greenhouse cover: Natural and artificial aging impacts, Journal of Applied Polymer Science,124(4), pp. 2702-2716.
2. Efimov, V.A., Kirillov, V.N., Dobryanskaya, O.A., Nikolaev, E.V. & Shvedkova A.K. (2010) Methodological issues of conducting full-scale climatic tests of polymer composite materials, Aviacionnye materialy i tekhnologii, (4), pp. 25–31 (in Russian).
3. Lettieri, M. & Frigione, M. (2011) Natural and artificial weathering effects on cold-cured epoxy resins, Journal of Applied Polymer Science, 119(3), pp. 1635-1645.
4. Kablov, E.N., Startsev, O.V., Krotov, A.S. & Kirillov, V.N. (2010) Climatic aging of composite materials for aviation purposes. I. Mechanisms of aging, Deformaciya i razrushenie materialov, (11), pp.19– 27(in Russian).
5. Startsev, O.V., Krotov, A.S. & Golub, P.D. (1998) Effect of climatic and radiation ageing on properties of glass fiber reinforced plastic VPS-7, International journal of polymeric materials, 41(3–4), pp. 263–273.
6. Kablov, E.N. & Startswv, V.O. (2020) Climatic aging of aviation polymer composite materials: I influence of significant factors. Russian metallurgy (Metally), (4), pp. 364-372.
7. Startsev, V.O. (2020) Methods of studying the aging of polymer binders, Klei. Germetiki. Tekhnologii, (9), pp.16-26 (in Russian).
8. Babenko, F.I. (2006) Fracture mechanisms and strength of engineering plastics in cold climates with aging taken into account, Nauka i obrazovanie, (1), pp. 84–87 (in Russian).
9. Reutov, A.I. (2009) Prediction of the climatic resistance of polymer materials used in construction, Vestnik TGASU, (2), pp. 127–141 (in Russian).
10. Nizin, D.R., Nizina, T.A., Selyaev, V.P., Chernov, A.N. & Gorenkova, A.I. (2019) Natural Climatic Aging of Epoxy Polymers Tasking into Account the Seasonality Impact, Key engineering materials,799, pp. 159- 165.
11. Startseva, O.V., Erofeeva, V.T. & Selyaeva, V.P. (eds.). (2017) Climatic tests of building materials. M.: ASV Publishing House (in Russian).
12. Pavlov, N.N. (1982) Aging of plastics in natural and artificial conditions. M.: Chemistry (in Russian).
13. Startsev, V.O. & Nizina, T.A. (2016) Reversible effect of moisture on the mechanical properties of epoxy polymers during climatic aging, Fundamental'nye issledovaniya i poslednie dostizheniya v oblasti zashchity ot korrozii, stareniya i biopovrezhdenij materialov i slozhnyh tekhnicheskih sistem v razlichnyh klimaticheskih usloviyah: materialy konf. / FGUP VIAM. 14-15 iyulya 1916 g., g. Gelendzhik [online]. Available at: https://conf.viam.ru/conf/194/proceedings (in Russian).
14. Startsev, V.O., Lebedev, M.P., Khrulev, K.A., Molokov, M.V., Frolov, A.S. & Nizina, T.A. (2018) Effect of outdoor exposure on the moisture diffusion and mechanical properties of epoxy polymers, Polymer testing, 65, pp. 281-296.
15. Startsev, V.O., Plotnikov, V.I. & Antipov, Yu.V. (2018) Reversible effects of moisture in determining the mechanical properties of PCM under climatic influences, Trudy VIAM, (5), pp. 110–118 (in Russian).
16. Nizina, T.A., Selyaev, V.P. & Nizin, D.R. (2020) Climatic resistance of epoxy polymers in a temperate continental climate. Saransk: Publishing House MRSU (in Russian).
17. Nizina, T.A., Nizin, D.R., Kanaeva, N.S., Klimenteva, D.A. & Porvatova, A.A. (2022) Influence of moisture state on the kinetics of damage accumulation in the structure of epoxy polymer samples under the action of tensile stresses, Ekspert: teoriya i praktika, (1), pp. 37-45 (in Russian).
