THEORETICAL ASPECTS OF AGING PROCESSES OF POLYMER MATERIALS
Abstract
Abstract. The article investigates the theoretical aspects of the problem of changes in the structure and properties of polymeric materials over time, which is of considerable scientific interest. The aim of the article is to analyze the course of aging processes of modified polymeric materials, theoretical generalization of the obtained results and modeling of trends in the projected development of processes. The article analyzes the influence of aging factors on the properties of modified polymeric materials used in various sectors of the economy. The course of physical aging of glassy polymer materials and changes of mobility of its structural elements at variation of temperature are considered. The analysis of the development of the aging processes in polymer materials gave the opportunity to determine the main groups subject to the action of influencing factors, the place of polymeric materials and belonging to certain groups. The obscurity (peculiarity) of the response of polymer materials to the action of factors – aging agents, which is associated with an extremely wide variety of such materials, different usage conditions, divergent terms and intensity of agent actions is shown. The analysis of degradation agents of polymer materials is carried out and conditional division of polymer materials by classes of resistance to aging is shown. The results of theoretical and practical studies summarize the effect of aging factors of polymer materials. It is proved that the possibility of phase transitions under the influence of factors and the corresponding additional damage to the structure should be taken into account during long-term studies of polymeric materials. Further research should be focused at profound study of the mechanism of aging of polymer films as well as at determination of quantitative relationship between the influences of various factors on the velocity of aging.
References
2. Спорягін Е. О., Варлан Е. О. Теоретичні основи та технологія виробництва полімерних композиційних матеріалів : навч. посібник. Дніпропетровськ : Вид-во ДНУ, 2012. 190 с. URL: http://library.dnu.dp.ua/Metodichki/sporjagin.pdf
3. Feller R. L. Accelerated aging : photochemical and thermal aspects. Ann Arbor (Michigan, USA): Edwards Bros., 1994. 292 p.
4. Hodge I. M. Physical Aging in Polymer Glasses. Science. 1995. 267 (5206). P. 1945-1947. URL: http://www.jstor.org/stable/2886443
5. Allara D. L. Aging of polymers. Environmental health perspectives. 1975. V. 11. P. 29–45.
6. Manas Chanda, Salil K. Roy Plastics technology handbook. NW (USA): CRC Press (Taylor &Francis Croup), 2006. 202 p.
7. Maxwell A. S., Broughton W. R., Dean G., Sims G. D. Review of accelerated ageing methods and lifetime prediction techniques for polymeric materials. NPL Report DEPC MPR 016. Middlesex (UK): National Physical Laboratory, 2005. 84 p. URL: www.npl.co.uk
8. Рэнби Б., Рабек Я. Фотодеструкция, фотоокисление, фотостабилизация полимеров. М. : Мир, 1978. 675 с.
9. Фойгт И. Стабилизация синтетических полимеров против действия света и тепла. Л. : Химия, 1972. 544 с.
10. Stadler R., Maurer A. Methods for durability testing and lifetime estimation of thermal interface materials in batteries. Batteries. 2019. 5 (34). P. 1–11. URL: www.mdpi.com/journal/batteries
11. Plota Angelika, Masek Anna. Lifetime Prediction Methods for Degradable Polymeric Materials. Materials. 2020. 13. P. 4507. URL: www.mdpi.com/journal/material
12. Lewandowski M., Pawłowska U. Przewidywanie okresu trwałości elastomerów Cz. I. Degradacja elastomerów i przewidywanie czasu życia. Elastomery. 2016. 20 (2). P. 24–30. URL: h t t p s : / / e l a s t o m e r y. p l / w p - c o n t e n t / u p l o a d s / streszczenia-pdf/E2016_2_Lewandowski. pdf
13. Carfagno S. P., Gibson R. J. A review of equipment aging: Theory and technology. NP-1558: Research Project 890-1. Philadelphia (Pennsylvania, USA): Franklin research center, 1980. 464 p. URL: https://www.osti.gov/servlets/ purl/5032834
14. ГОСТ 9.710-84 «Старение полимерных материалов: Термины и определения». 11 с.
