Voronezh, Voronezh, Russian Federation
Voronezh State Forestry Engineering Academy (departmentof General and Applied Physics, Head of the departmentof)
Voronezh, Russian Federation
Voronej, Voronezh, Russian Federation
UDC 678
The study is devoted to establishing a relationship between the thermophysical conditions of the crystallization of linear polymers and the change in their molecular dipole characteristics. The relevance of the work is due to the need to understand the mechanisms of structure formation in polymer materials used in elements of thermal power equipment. Based on a conformational approach and modeling of the internal electric field that arises in a non-uniform temperature field, an analytical expression is obtained that relates the average square of the dipole moment of a macromolecule to its molar mass. Numerical calculations have been performed for a number of polymethylsiloxane liquids (PMS) in the phase transition interval. It has been shown that the dependence of the average dipole moment square on the molar mass has a non-monotonic character with extrema that correspond to the change of crystallization mechanisms. Critical values of molar mass (about 3000 kg/mol) have been determined, at which the transition from crystallization with extended chains to crystallization with folded chains occurs, which directly affects the thermophysical properties of the material, such as thermal conductivity and the temperature coefficient of linear expansion.
polymer crystallization, thermophysical properties, dipole moment, polymethylsiloxane, molar mass, non-uniform temperature field, phase transition
1. Akimova, A. S.Polimernyy kompozicionnyy material dlya teploizolyacii pri povyshennyh temperaturah / A. S. Akimova, L. S. Filippova // Mezhdunarodnyy zhurnal prikladnyh i fundamental'nyh issledovaniy. – 2022. – № 8. – S. 40-44. DOI: https://doi.org/10.17513/mjpfi.13424; EDN: https://elibrary.ru/SOTONG
2. Habibullina, L. R. Novye antikorrozionnye polimernye pokrytiya hranilisch stokov vodopodgotovitel'nyh ustanovok (VPU) TES / L. R. Habibullina, L. A. Nikolaeva // Izvestiya vysshih uchebnyh zavedeniy. Problemy energetiki. – 2003. – № 5-6. – S. 144-147. EDN: https://elibrary.ru/RACDRP
3. Perspektivy ispol'zovaniya kremniyorganicheskih polimerov pri sozdanii sovremennyh materialov i pokrytiy razlichnyh naznacheniy / I. D. Kraev, O. V. Popkov, E. M. Shul'deshov [i dr.] // Trudy VIAM. – 2017. – № 12(60). – S. 48-62.
4. Lisicyn, V. I. Modelirovanie dinamiki hoda rosta drevostoev na osnove termodinamicheskogo podhoda / V. I. Lisicyn, M. V. Drapalyuk, N. N. Matveev // Izvestiya vysshih uchebnyh zavedeniy. Lesnoy zhurnal. – 2022. – № 3(387). – S. 213-225. DOI: https://doi.org/10.37482/0536-1036-2022-3-213-225; EDN: https://elibrary.ru/YPPQHS
5. Kamalova, N. S. Model' uprochneniya modificirovannoy drevesiny / N. S. Kamalova, V. V. Postnikov, N. N. Matveev // Fundamental'nye problemy radioelektronnogo priborostroeniya. – 2006. – T. 6, № 3. – S. 82-86. EDN: https://elibrary.ru/UKZGOT
6. Volkov, D. P. Teplofizicheskie svoystva polimernyh kompozicionnyh materialov / D. P. Volkov, A. G. Egorov, M. E. Mironenko // Nauchno-tehnicheskiy vestnik informacionnyh tehnologiy, mehaniki i optiki. – 2017. – T. 17, № 2. – S. 287-293. DOI: https://doi.org/10.17586/2226-1494-2017-17-2-287-293; EDN: https://elibrary.ru/VZBFGP
7. Vunderlih, B. Fizika makromolekul. V 3 t. T. 2. Zarozhdenie, rost i otzhig kristallov / B. Vunderlih. – Moskva : Mir, 1979. – 574 s.
8. Mandel'kern, L. Kristallizaciya polimerov / L. Mandel'kern. – Moskva-Leningrad : Himiya, 1966. – 336 s.
9. Sobolevskiy, M.V. Svoystva i oblasti primeneniya kremniyorganicheskih produktov / M.V. Sobolevskiy, O.A. Muzovskaya, G.S. Popeleva. – Moskva: Himiya, 1975. – 296 s.
10. Polydimethylsiloxane mechanical properties: A systematic review / I. Teixeira, I. Castro, V. Carvalho [et al.] // AIMS Materials Science. – 2021. – Vol. 8, Iss. 6. – P. 952-973. DOI: https://doi.org/10.3934/matersci.2021058; EDN: https://elibrary.ru/RTTTCS
11. Metodika polucheniya neodnorodnogo temperaturnogo polya dlya issledovaniya polyarizacionnyh effektov v kristallizuyuschihsya polimerah / N. S. Kamalova, N. Yu. Evsikova, N. N. Matveev, V. V. Postnikov, A. V. Yankovskiy // Fizika dielektrikov (Dielektriki - 2004) : materialy X mezhdunarodnoy konferencii, Sankt-Peterburg, 23–27 maya 2004 goda / Otvetstvennyy redaktor: Gorohovatskiy Yu.A. – Sankt-Peterburg: Rossiyskiy gosudarstvennyy pedagogicheskiy universitet im. A.I. Gercena, 2004. – S. 295-297. EDN: https://elibrary.ru/THGICH
12. Piroelektricheskie svoystva i fazovye perehody v polidimetilsiloksane / V. S. Voischev, N. N. Matveev, P. M. Valeckiy, V. V. Korshak // Doklady Akademii nauk SSSR. – 1983. – T. 273, № 3. – S. 647-649. EDN: https://elibrary.ru/RUUJRL
13. Konformacionnyy podhod k mehanizmam kristallizacii kremniyorganicheskih zhidkostey marki PMS v neodnorodnom temperaturnom pole / N. N. Matveev, V. I. Lisicyn, N. S. Kamalova, N. Yu. Evsikova, S. V. Vnukova // Plasticheskie massy. – 2023. – № 3-4. – S. 36-38. DOI: https://doi.org/10.35164/0554-2901-2023-3-4-36-38; EDN: https://elibrary.ru/DHYZPJ
14. Matveev, N. N. Piroelektricheskie svoystva polimernyh materialov pri fazovyh perehodah kristallizaciya -plavlenie / N. N. Matveev, A. S. Sidorkin // Fizika tverdogo tela. – 1994. – T. 36, № 8. – S. 2440-2443. EDN: https://elibrary.ru/RUMMNZ
15. Matveev, N. N. Termopolyarizaciya kremniyorganicheskih polimerov pri perehodah kristallizaciya-plavlenie / N. N. Matveev, A. S. Sidorkin // Fizika tverdogo tela. – 1994. – T. 36, № 9. – S. 2791-2794. EDN: https://elibrary.ru/RUUIWR
