## 3 Results  
### Tensile Test Results  
Table 2 and the Figure 2 shows the results of the mechanical stress-strain tests. PVA and chitosan (Chi) underwent to mechanical tests. They do not show the Chi results because the films showed fragility when manipulated to perform the test. The PVA samples showed a tensile strength of 10.16 MPa with a deformation of 341.44 mm/mm. In the B1 PVA-Chi mixture, Chi caused an increase in tensile strength from the 10.16 MPa of PVA alone to 18.84 MPa for the PVA-Chi mixture. Regarding deformation, Chi in the mixture reduced the percentage of deformation from 341.44 mm/mm for PVA alone to 281.93 mm/mm for the PVA-Chi mixture (shows Figure 3). This could be because of an increase in the formation of hydrogen bridges between PVA chains and Chi, as has reported by [PERSON], [PERSON] and [PERSON]. (2016) [4]. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Sample**} & \multirow{2}{*}{\
\begin{tabular}{c} **Stress** \\ **(MPa)** \\ \end{tabular} } & \multirow{2}{*}{
\begin{tabular}{c} **Strain** \\ **(mm/mm)** \\ \end{tabular} } & \multicolumn{2}{c}{**Young’s Modulus**} & \multicolumn{2}{c}{**Thickness**} \\ \cline{4-6}  & & & **(MPa)** & **Standard** & **Mean** & **Standard** \\  & & & & **Deviation** & **(mm)** & **Deviation** \\ \hline B1 & 18.84 & 281.93 & 10.80667 & 0.11218 & 0.21667 & 0.01528 \\ B2 & 20.88 & 239.98 & 12.728 & 0.66916 & 0.36 & 0.05292 \\ B3 & 20.55 & 230.49 & 18.10667 & 0.95978 & 0.399 & 0.02152 \\ B4 & 23.56 & 254.58 & 19.67467 & 0.35194 & 0.17433 & 0.02503 \\ B5 & 17.13 & 279.4 & 9.38567 & 1.12666 & 0.178 & 0.01803 \\ B6 & 20.59 & 298.37 & 12.05367 & 0.39865 & 0.307 & 0.05174 \\ B7 & 15.42 & 327.71 & 6.677 & 0.22598 & 0.26 & 0.0364 \\ B8 & 19.11 & 339.98 & 8.50333 & 0.39415 & 0.31667 & 0.07638 \\ B9 & 20.06 & 302.91 & 11.68667 & 0.81716 & 0.23467 & 0.08358 \\ B10 & 19.54 & 214.76 & 14.40767 & 1.54626 & 0.3 & 0.05 \\ B11 & 14.57 & 238.27 & 12.808 & 1.17067 & 12.95 & 21.69395 \\ B12 & 18.15 & 314.46 & 10.74567 & 0.64616 & 0.35667 & 0.06028 \\ B13 & 9.91 & 244.15 & 7.99667 & 0.53993 & 0.35 & 0.05 \\ B14 & 11.78 & 186.86 & 12.17133 & 1.12618 & 0.24667 & 0.04509 \\ B15 & 40.33 & 355.25 & 17.579 & 0.47188 & 0.18467 & 0.0999 \\ B16 & 21.94 & 318.6 & 12.444 & 0.24258 & 0.23333 & 0.04509 \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Statistical analysis of Mechanical Properties. The presence of the PPy filler in the PVA-Chi samples increased the mechanical resistance of the composite films, achieving an increase of up to 23.56 MPa in the B4 PVA-Chi/PPy0.3 sample. Although PPy has brittle properties, this did not detract from its contribution to mechanical strength, but it did render the matrix more susceptible to deformation, reducing its elasticity elasticity from 281.93 mm/mm (B1 PVA-Chi) to 254.58 mm/mm (B4 PVA-Chi/PPy0.3). The PEDOT: PSS filler increased the ductility of the materials, while the use of MWCNT improved their mechanical resistance, using a concentration of 0.2 g of each (B6 PVA-Chi/PEDOT: PSS0.2 and B8 PVA-Chi/ MWCNT0.2) increased the percentage of deformation and the mechanical resistance of the materials. This did not happen with concentrations of 0.1 g (B5 PVA-Chi/PEDOT: PSS0.1 and B7 PVA-Chi/MWCNT0.1) since there was a percolation concentration at precisely 0.2 g, beyond which the mentioned properties increased. The same results have been reported by [PERSON] and [PERSON]. (2018) [10; 16]. It is important to note that the sample representing the B15 quaternary mixture containing 0.3 g of PPy and 0.1 g of the PEDOT: PSS, CB, and MWCNT fillers showed high deformation and mechanical resistance values. The presence of PPy significantly contributed to increasing the percentage of deformation, while the interaction of the fillers, used in concentrations of 0.1%, gave greater mechanical resistance to the materials. The B15 PVA-Chi/PPy0.3/PEDOT: PSS0.1/MWCNT0.1/CB0.1 sample required a stress of 40.332 MPa for a deformation of 355.252%; thus, it is possible to say that the material is not a pure material.