| Summary: | The curing process and thermoresistive response of a single carbon nanotube yarn (CNTY) embedded in a room temperature vulcanizing (RTV) silicone forming a CNTY monofilament composite were investigated toward potential applications in integrated curing monitoring and temperature sensing. Two RTV silicones of different crosslinking mechanisms, SR<sub>1</sub> and SR<sub>2</sub> (tin- and platinum-cured, respectively), were used to investigate their curing kinetics using the electrical response of the CNTY. It is shown that the relative electrical resistance change of CNTY/SR<sub>1</sub> and CNTY/SR<sub>2</sub> monofilament composites increased by 3.8% and 3.3%, respectively, after completion of the curing process. The thermoresistive characterization of the CNTY monofilament composites was conducted during heating–cooling ramps ranging from room temperature (RT~25 °C) to 100 °C. The thermoresistive response was nearly linear with a negative temperature coefficient of resistance (TCR) at heating and cooling sections for both CNTY/SR<sub>1</sub> and CNTY/SR<sub>2</sub> monofilament composites. The average TCR value was −8.36 × 10<sup>−4</sup> °C<sup>−1</sup> for CNTY/SR<sub>1</sub> and −7.26 × 10<sup>−4</sup> °C<sup>−1</sup> for CNTY/SR<sub>2</sub>. Both monofilament composites showed a negligible negative residual relative electrical resistance change with average values of ~−0.11% for CNTY/SR<sub>1</sub> and ~−0.16% for CNTY/SR<sub>2</sub> after each cycle. The hysteresis amounted to ~21.85% in CNTY/SR<sub>1</sub> and ~29.80% in CNTY/SR<sub>2</sub> after each cycle. In addition, the effect of heating rate on the thermoresistive sensitivity of CNTY monofilament composites was investigated and it was shown that it reduces as the heating rate increases.
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