THERMORESISTIVE BEHAVIOR OF THE SYSTEMS BASED ON CROSS-LINKED POLYURETHANES AND CARBON NANOTUBES
Journal Title: Сенсорна електроніка і мікросистемні технології - Year 2019, Vol 16, Issue 2
Abstract
This work is devoted to the study of thermoresistive behavior of nanocomposites based on crosslinked polyetherurethanes (CPEU) and carbon nanotubes (CNT) with the purpose of application of these materials as mediums for sensors of temperature. Synthesis of samples for research was carried out, using the method of polymerization in situ. The method of impedance spectroscopy is used for the research of the conductivity dependence of the systems based on CPEU and CNT from temperature. The dependence of the electrical conductivity of systems, based on CPEU on the content of CNT is obtained, and this dependence is modeled in the framework of the scaling approach of the percolation theory. The value of the percolation threshold for the CPEU-CNT system is 0.0032, and the critical index t = 1.51. It is established that the main mechanism of charge transfer in this system is the tunneling mechanism. The phenomenon of percolation in these systems is confirmed by the results of optical microscopy. From the microphotograms it can be seen that the percolation cluster is formed at the content of the filler 0,003. As a result of the studies, the influence of temperature on the electrical conductivity of systems based on mesh polyetherurethane and carbon nanotubes was studied. It was established that electrical conductivity in the temperature range from 300 K to 400 K increases by more than 40 times. As a result of the analysis of dependencies of electrical conductivity on temperature, a resistivity-temperature coefficient is calculated, which is one of the main characteristics of sensitivity of temperature sensors. Thus, in the range of temperatures from 300 К to 400 К for all investigated samples of the system СПУУ-ВНТ this coefficient lies within -0.27 ÷ -0.55% K-1. The values obtained are correlated with sensitivity values for sensors based on other elastomers and CNT, which are widely used in practice. It is shown that materials based on CPEU and CNT are promising for their use as a thermosetting medium for temperature sensors or different types of thermal sensors.
Authors and Affiliations
E. А. Lysenkov, Е. V. Lobko, Z. O. Gagolkina, R. V. Dinzhos, V. V. Klepko
Keywords
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- EP ID EP670188
- DOI 10.18524/1815-7459.2019.2.171243
- Views 79
- Downloads 0
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