# Preparation Methods and Properties of CNT/CF/G Carbon-Based Nano-Conductive Silicone Rubber
## 3 Results and Discussion
### Properties of the PREPARED Single-Filler Conductive Silicone Rubbers
(**a**) Tensile strength; (**b**) elongation at break; (**c**) elastic modulus. As shown in Figure 8, for LSR/G with 5.5 wt% graphene, T\({}_{\text{d,5\%}}\), T\({}_{\text{d.10\%}}\), and T\({}_{\text{d.50\%}}\) were 470 \({}^{\circ}\)C, 509 \({}^{\circ}\)C, and 569 \({}^{\circ}\)C, respectively, and the corresponding temperature and weight loss at Tmax were 798 \({}^{\circ}\)C and 32.124%, respectively. Furthermore, according to the thermogravimetric analysis, the heat resistance of LSR/G was higher than that of pure LSR. The initial decomposition temperature of LSR/G was 29 \({}^{\circ}\)C higher than that of pure LSR (441 \({}^{\circ}\)C), and the heat resistance enhancement effect of the LSR/G was higher than that of LSR/CF. LSR/G with 5.5 wt% graphene has good heat resistance, but its heat resistance is lower than that of LSR/CF, and the bonding performance between graphene and the silicone rubber matrix is better than that between CF and the silicone rubber matrix. Properties of carbon nanotube conductive silicone rubber Carbon nanotube conductive silicone rubber (LSR/CNT) was prepared with 0.2, 0.5, 0.75, 1, 1.25, 1.5, and 2.5 wt% CNTs. The ratio of silicone rubber to n-heptane was kept unchanged at 1:2. The properties of the samples were analyzed. Electrical properties of LSR/CNT. The volume resistivity and surface resistance of the LSR/CNT with different CNT concentrations are shown in Figure 9 and Table 6.  
Figure 8: LSR-G thermogravimetric analysis diagram. Table 3.0 Raman spectra of LSR + 5.5 wt% G.  
As shown in Figure 9, for CNT content of less than 1 wt%, the proportion of CNTs in the conductive silicone rubber was low, the spacing between CNTs particles was large, and the conductive path did not form. When the CNT content was increased from 1 to 1.25 wt%, the resistivity stabilized, and the conductive path easily formed. When the mass ratio of CNTs is 1.25%, the volume resistivity of conductive silicone rubber is \(1.34\times 10^{4}\)\(\Omega\)-cm, and the surface resistance is 1.00 \(\times\)\(10^{6}\)\(\Omega\). When the CNT content was further increased, the volume resistivity and surface resistance remained basically unchanged. The volume resistivity of polydimethylsiloxane (PDMS)/multi-walled carbon nanotubes (CNT) prepared in literature [20] is 1 \(\times\)\(10^{6}\)\(\Omega\)-cm, which is higher than that of the 1.25 wt% carbon nanotube conductive silicone rubber prepared in this paper. The volume resistivity (\(1.34\times 10^{4}\)\(\Omega\)-cm) is 2 orders of magnitude higher, which indicates that the carbon nanotube conductive silicone rubber prepared in this paper has better electrical properties. The above experiments show that CNTs have excellent conductivity and can form conductive paths in the matrix when filled at low concentrations. The CNT content of 1-1.5 wt% was selected as the best technological ratio, and the electrical properties are good in this range. (b) Mechanical properties of LSR/CNT. The tensile strength, elongation at break, and elastic modulus of LSR/CNT with different CNT concentrations are shown in Figure 10 and Table 3.1 \begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline
**Carbon** & & & & & & & \\
**Nanotube Content** & 0.2 & 0.5 & 0.75 & 1 & 1.25 & 1.5 & 2.5 \\
**wt%** & & & & & & & \\ \hline
**Volume Resistivity** & & & & & & & \\ \(\Omega\)**-cm** & & & & & & & \\
**Surface Resistance** & & & & & & & \\ \(\Omega\) & & & & & & & \\ \(\Omega\) & & & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 6: The electrical properties of different concentrations of carbon nanotubes fill. \begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline
**Carbon Nanotube Content** & & & & & & & & \\
**wt\%** & & & & & & & \\ \hline
**Tensile Strength** & & & & & & & \\
**/Mpa** & & & & & & & \\
**Elongation at Break** & & & & & & & \\ \(/\)**\%** & & & & & & & \\
**Elastic Modulus** & & & & & & & \\
**/Mpa** & & & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 7: The resynamic properties of different concentrations of carbon nanotubes fill.