DOI: 10.18503/1995-2732-2024-22-4-134-143
Abstract
The paper presents an analysis of organosilicon elastomers modified by multi-walled carbon nanotubes (MWCNTs) with metallised surface, which were synthesised by microwave, and MWCNTs obtained by CVD-technology. The effect of the metallisation of the MWCNT surface on the electrical and thermophysical parameters was analysed. The obtained data showed the thermal stability of the studied samples under the influence of alternating electric voltage due to the stability of the formed structure to electric current. It should be noted that all samples are characterised by the presence of the effect of temperature self-regulation, expressed in a decrease in the power of heat release when the temperature rises to 40°C. Improvement of temperature field distribution for heating element on the basis of organosilicon elastomer containing MWCNTs with surface modification has been established. For MWCNTs without surface modification at ambient temperature -40°C at the 50th cycle the heating element worked at specific electric power equal to 1.1 kW/m2, and at the 100th cycle there was deterioration of structural properties of conductive filler and, as a consequence, decrease of specific power to 0.3 kW/m2. At the same time, the metallisation of MWCNTs allowed to increase the power of the heating element by 27%, caused by the increase of electrical conductivity, due to the larger area of metallic contact between separate MWCNTs, and at the same time to reduce the intensity of degradation of conductive structures after the 100th cycle and more, and thus, to increase the thermal stability of the polymer composite operating at alternating electric voltage. At equal concentration of MWCNTs in elastomers, for metallised MWCNTs much better electrical and thermophysical characteristics are observed, which is connected with improvement of heat transfer processes with simultaneous improvement of electrical conductivity.
Keywords
catalyst, multi-walled carbon nanotubes (MWCNTs), organosilicon elastomer, surface metallization, temperature field, microwave synthesis, CVD method
For citation
Shchegolkov A.V., Shchegolkov A.V., Zemtsova N.V., Nikulin P.N. Comparative Analysis Of Organosilicon Elastomers Modified With Multi-Walled Carbon Nanotubes Produced By Microwave And Cvd-Technology. Vestnik Magnitogorskogo Gosudarstvennogo Tekhnicheskogo Universiteta im. G.I. Nosova [Vestnik of Nosov Magnitogorsk State Technical University]. 2024, vol. 22, no. 4, pp. 134-143. https://doi.org/10.18503/1995-2732-2024-22-4-134-143
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