## 4 Conclusions  
This study successfully developed VNR-based nanocomposites reinforced with MWCNTs, demonstrating significant improvements in rheological, thermal, mechanical, and electrical properties. Rheometric tests showed enhanced vulcanization following MWCNT addition, improving parameters like torque and scorch time. Strong interfacial bonding between MWCNTs and the VNR, confirmed using the Lorenz-Park method, led to improved mechanical strength, while SEM revealed uniform MWCNT dispersion. Mechanical tests showed increased rigidity, strength, and wear resistance with higher MWCNT concentrations. The tensile test revealed that increasing the concentration of MWCNTs in the VNR/MWCNT nanocomposite reduced the strain at the break, whereas it increased the stress at the break, demonstrating the positive effect and reinforcing properties of the MWCNTs in the VNR matrix. Based on thermal analysis, all the VNR/MWCNT nanocomposite specimens exhibit the same thermal profile as neat VNR, with the main mass loss occurring between 350 and 400 \({}^{\circ}\)C due to the degradation of the isoprene chain in the VNR. The thermal stability of the VNR-based nanocomposites was not affected by MWCNT dispersion. DMA results revealed a transition from rigid to rubbery states in the \(-65\)\({}^{\circ}\)C to \(-20\)\({}^{\circ}\)C range. As determined by DC electrical analysis, when 5 phr of MWCNTs are dispersed in the NRV/MWCNT nanocomposite, there is an increase of ten orders of magnitude in electrical conductivity compared to that of pure NRV, and the percolation threshold is near 3 phr. \begin{table}
\begin{tabular}{l c} \hline \hline
**Specimens** & \(\sigma_{dc}\) **(S/m)** \\ \hline
**VNR** & (2.64 \(\pm\) 0.08) \(\times\)\(10^{-14}\) \\
**VNR/MWCNT1** & (2.84 \(\pm\) 0.03) \(\times\)\(10^{-14}\) \\
**VNR/MWCNT2** & (4.23 \(\pm\) 0.05) \(\times\)\(10^{-12}\) \\
**VNR/MWCNT3** & (3.36 \(\pm\) 0.04) \(\times\)\(10^{-8}\) \\
**VNR/MWCNT4** & (7.45 \(\pm\) 0.04) \(\times\)\(10^{-6}\) \\
**VNR/MWCNT5** & (2.24 \(\pm\) 0.06) \(\times\)\(10^{-4}\) \\ \hline \hline \end{tabular}
\end{table} 
Table 5: _dc_ electrical conductivity of VNR-based nanocomposites with varying MWCNT phr concentrations. These findings demonstrate the potential of MWCNT-reinforced VNR nanocomposites for advanced applications such as flexible electronics and sensors, offering superior performance across multiple properties. Conceptualization, D.S.M., C.T.H., R.J.S., and M.J.S. ; methodology, D.S.M., C.T.H., G.R.T., R.J.S., and M.J.S. ; validation, D.S.M., C.T.H., G.R.T., J.A.M., C.R.C., A.E.J., R.J.S., and M.J.S. ; formal analysis, D.S.M., C.T.H., A.E.J., R.J.S., and M.J.S. ; investigation, D.S.M., C.T.H., G.R.T., J.A.M., C.R.C., A.E.J., R.J.S., and M.J.S. ; resources, R.J.S. and M.J.S. ; data curation, D.S.M., C.T.H., J.A.M., C.R.C., A.E.J., and M.J.S. ; writing--original draft, D.S.M., C.T.H., G.R.T., J.A.M., C.R.C., A.E.J., R.J.S., and M.J.S. ; writing--review and editing, C.T.H., J.A.M., C.R.C., A.E.J., R.J.S., and M.J.S. ; visualization, C.T.H., J.A.M., R.J.S., and M.J.S. ; supervision, R.J.S. and M.J.S. ; project administration, M.J.S. ; funding acquisition, M.J.S. All authors have read and agreed to the published version of the manuscript. This research was funded by Sao Paulo State Funding Agency (FAPESP), grant number grant 2017/19809-5. * [PERSON] et al. (2023) [PERSON]; [PERSON]; [PERSON] Electrically-Assisted Supersonic Solution Blowing and Solution Blow Spinning of Fibrous Materials from Natural Rubber Extracted from Havea Brasilenses. _Ind. Crops Prod._**2023**, _192_, 116101. [CrossRef]
* [PERSON] and [PERSON] (2012) [PERSON]; [PERSON] _Natural Rubber Biosynthesis in Plants: Rubber Transferase_, 1 st ed. ; Elsevier Inc.: Amsterdam, The Netherlands, 2012; Volume 515, ISBN 9780123942906. * [PERSON] et al. (2023) [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON]; [PERSON] Carbon Nanotube-Reinforored Polymer Nanocomposites for Sustainable Biomedical Applications: A Review. _J. Sci. Adv. Mater.