# Mechanical and Conductive Behavior of Graphite Filled Polysulfone-Based Composites
## 4 Summary and Conclusions  
Thermo-electroconductive composites are cutting-edge materials that are frequently employed in a variety of sectors, including the machine-building and construction industries. These materials, for instance, can be used as sensors to track changes in structures, \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Filter Content wt.\%** & **NG** & \multicolumn{3}{c}{**AG**} & \multicolumn{3}{c}{**EG**} \\ \hline  & **Electrical** & **Thermal** & **Electrical** & **Thermal** & **Electrical** & **Thermal** \\  & **Conductivity W/m \(\cdot\) K** & **Conductivity W/m \(\cdot\) K** & **Conductivity W/m \(\cdot\) K** & **Conductivity W/m \(\cdot\) K** & **Conductivity W/m \(\cdot\) K** \\ \hline
30 & 0.0305 \(\pm\) 0.009 & 0.74 \(\pm\) 0.02 & 0.0005 \(\pm\) 0.0001 & 0.71 \(\pm\) 0.02 & 0.3010 \(\pm\) 0.08 & 3.83 \(\pm\) 0.2 \\
40 & 8 \(\pm\) 0.9 & 1.54 \(\pm\) 0.13 & 0.0024 \(\pm\) 0.0016 & 0.75 \(\pm\) 0.03 & 2.5 \(\pm\) 0.1 & 2.30 \(\pm\) 0.15 \\
50 & 37.5 \(\pm\) 1.9 & 7.35 \(\pm\) 0.5 & 0.013 \(\pm\) 0.002 & 0.99 \(\pm\) 0.1 & 4.8 \(\pm\) 0.6 & 2.64 \(\pm\) 0.18 \\
60 & 49.6 \(\pm\) 3.5 & 5.38 \(\pm\) 0.32 & 0.4 \(\pm\) 0.01 & 1.91 \(\pm\) 0.4 & 5.5 \(\pm\) 0.7 & 4.88 \(\pm\) 0.29 \\
70 & 52.9 \(\pm\) 4.2 & 4.05 \(\pm\) 0.25 & 3.846 \(\pm\) 0.2 & 4.5 \(\pm\) 0.23 & 17 \(\pm\) 1.9 & 5.05 \(\pm\) 0.34 \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Comparison between electrical and thermal conductivity of the samples. shield stray currents from electrification networks, block electromagnetic radiation in operating rooms, provide cathodic protection from moisture or shield buildings from high voltages. This study focuses on the study of thermoelectrically conductive polymeric composites containing fillers made of graphite. In this study, we examined the electroconductive properties of composites with various graphite ratios and kinds, as well as their mechanical characteristics, such as compressive and tensile strength. In this work, the PSU-based composition was prepared using the solution-casting method and filled with different filler concentrations up to 70 wt.%. Three different types of graphite were employed as filler to improve mechanical and thermo-electrical conductivity. In order to achieve high conductive properties in composites, our work aimed to develop high filled composites with high density and low porosity. Several types of graphite as a filler were used to highlight the effects of filler-type, particle size and aspect ratio on the conductivity and mechanical performance of the composites. The results show that using NG as filler resulted in a denser and lower porosity composite compared to AG and EG. To get rid of high porosity in this study, we improved the preparation method of the samples using a steel mold with holes for a steel frame and improved the mixing process. By achieving a more flawless structure, lowering material porosity, and raising material density, we were able to improve composites' heat conductivity. According to the SEM data, percolation grids of AG occur as a result of point connections between graphite particles, whereas in the case of NG, contacts form as a result of particle overlap, allowing for improved heat transmission. Point connections among EG particles cause them to create a grid. The accomplishment of thermal conductivity of 7.35 W/m \(\cdot\) K and electrical conductivity of 52.9 S/cm was made possible by high filling levels using graphite fillers. Natural graphite has been found to have the biggest influence on thermal and electrical properties, while materials containing scattered artificial graphite have the best mechanical features. The resulting materials are appealing for the manufacturing of parts for redox batteries and other electrochemical energy converters because of their advantageous thermal, electrical, and chemical properties. Conceptualization, A.A.S. ; investigation, H.M. and A.I.L. ; writing--original draft preparation, H.M.; writing--review and editing, V.V.T. ; supervision, A.A.S.