Creation of low-thermal-conductivity polymer nanocomposites for internal gas vents of boiler chimneys
DOI:
https://doi.org/10.31548/energiya2020.05.057Abstract
Methods and results of experimental studies of thermophysical, structural and mechanical properties of low-heat-conducting polymer nanocomposites, oriented to use for gas ducts and chimneys of boiler installations, as well as various other gas and water communications are presented. In this work, on the basis of the performed set of methodological studies regarding the analysis of the legitimacy of using different models of heat conductivity for predicting the heat-conducting properties of these composites, the possibility of using for this prediction a number of models of the theory of the effective medium and the theory of percolation is considered. The analysis of thermophysical properties, structural characteristics and Young's modulus of low-heat-conductivity polymer nanocomposites based on polyethylene and polypropylene is carried out. Using these nanocomposites as an example, the achievement of a significant increase in their Young's modulus in comparison with unfilled polymers with a relatively small increase in heat conductivity is demonstrated. To obtain nanocomposites, we used a method based on mixing the components in a polymer melt using an extruder and then shaping the composite into the required shape by hot pressing. The method of differential scanning calorimetry was used to determine Young's modulus. On the basis of the studies carried out, the possibility of obtaining low-heat-conducting polymer nanocomposites with improved mechanical characteristics has been shown. In particular, it was shown that for nanocomposites based on polyethylene or polypropylene filled with CNTs (carbon nanotubes) or nanodispersed aerosil particles, with a mass fraction of the latter up to 2%, the following takes place a relatively insignificant increase in heat conductivity coefficients and a significant increase in the modulus of elasticity in tension. The research data also made it possible to obtain for the developed nanocomposites the temperature dependences of their specific mass heat capacity and, on this basis, to analyze the regularities of changes in the structural characteristics of these materials.
Key words: low-heat-conductivity polymer nanocomposites, heat conductivity models, thermophysical properties, gas outlet communications of boiler installations
References
Dolinsky, A. A., Fialko, N. M., Navrodska, R. A., Gnedash, G. A. (2014). Osnovnyye printsipy sozdaniya teploutilizatsionnykh tekhnologiy dlya kotel'nykh maloy teployenergetiki [Basic principles of creation of heat recovery technologies for boiler houses of small heat and power engineering]. Industrial Heat Engineering, 36(4), 27-34.
Fialko, N. M., Navrodska, R. A., Shevchuk, S. I., Stepanova, A. I., Presich, G. A., Gnedash, G. A. (2018). Teplovyye metody zashchity gazootvodyashchikh traktov kotel'nykh ustanovok [Heat methods of protection of gas exhaust ducts of boiler plants]. Kyiv: LLC "Pro Format", 248.
Fialko, N. M., Navrodska, R. A., Gnedash, G. A., Shevchuk, S. I., Dashkovskaya I. L. (2019). Osusheniye dymovykh gazov kotel'nykh ustanovok v kondensatsionnykh teploutilizatorakh [Dehumidification of flue gases of boiler plants in condensing heat recovery units]. International scientific journal "Internauka", 1(15), 109-111.
Lin Chen, Ying-Ying Sun, Jun Lin, Xiao-Ze Du, Gao-Sheng Wei, Shao-Jian He, Sergei Nazarenko. (2015). Modeling and analysis of synergistic effect in thermal conductivity enhancement of polymer composites with hybrid filler. International Journal of Heat and Mass Transfer, 81, 457-464.
https://doi.org/10.1016/j.ijheatmasstransfer.2014.10.051
Kirkpatrick, S. (1973). Percolation and Conduction. Reviews of modern physics, 45(4), 574.
https://doi.org/10.1103/RevModPhys.45.574
D.S. McLachlan, C. Chiteme, W.D. Heiss, Junjie Wu. (2003). The correct modelling of the second order terms of the complex AC conductivity results for continuum percolation media, using a single phenomenological equation. Physica B: Condensed Matter, 338(1-4), 256-260.
https://doi.org/10.1016/j.physb.2003.08.002
Dolinsky, A. A., Fialko, N. M., Dinzhos, R. V., Navrodska, R. A. (2015). Teplofizicheskiye svoystva polimernykh mikro- i nanokompozitov na osnove polikarbonata [Thermophysical properties of polymer micro- and nanocomposites based on polycarbonate]. Industrial Heat Engineering, 2, 12-19.
https://doi.org/10.31472/ihe.2.2015.02
Dolinsky, A. A., Fialko, N. M., Dinzhos, R. V., Navrodska, R. A. (2015). Vliyaniye metodov polucheniya polimernykh mikro- i nanokompozitov na ikh teplofizicheskiye svoystva [Influence of methods of obtaining polymer micro- and nanocomposites on their thermophysical properties]. Industrial Heat Engineering, 4, 5-13.
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