## 5 Conclusions  
The present work is a study of the physical and chemical properties of conductive composite films made from PVA-Chi and 4 fillers (PPy, PEDOT: PSS, MWCNT, and CB). The results showed that the incorporation of PPy improved the mechanical properties and Young's modulus of the materials. The analysis of the contact angle showed that all the samples, having an angle of less than 90\({}^{\circ}\), had hydrophilic characteristics, but the samples containing the four fillers showed an increase in their hydrophobic character. It is important to point out that the morphological analysis (SEM) showed that the materials obtained are homogeneous, which promoted the interaction between the fillers, as demonstrated by the FTIR analysis, which showed evidence of hydrogen bridges in the quaternary samples (those containing the four fillers). One of the most interesting results concerned the interaction between Chi and PVA. The literature reports that Chi improves the mechanical properties of PVA, that is, it increases its Young's modulus. Indeed, in the present work Chi improved the mechanical properties of PVA, but the best mechanical properties were observed in the B15 PVA-Chi/PPy0.3/PEDOT: PSS0.1/MWCNT0.1/CB0.1 sample, a PVA-Chi material mixed with the four fillers under study. This mixture was made of B15 PVA-Chi/PPy 0.3/PEDOT 0.1/MWCNT 0.1/CB 0.1, and it achieved a Young's modulus of 17.743 MPa, a maximum tensile strength of 40.332 MPa and a deformation of 355.252%, compared to the B1 PVA-Chi sample, which had a Young's modulus of 10.858 MPa, a maximum tensile strength of 18.481 MPa and a deformation of 281.932%.  
The Nyquist diagram generated with the data from electrical tests showed that the materials containing the fillers under study had decreased resistance due to the transfer of the electrons and the dispersion of the fillers. The Bode diagram showed a different behavior; the samples with higher concentrations of PPy and PEDOT: PSS at higher concentration showed resistive behavior due to the presence of amino groups in PPy and Chi that interact with the free links of PVA and PEDOT to form a more conductive material. The results of the present work provide important information about the possibility of obtaining composite materials with potential applications in microelectronics.  
Conceptualization A.O.-P., A.M.S.-D. and J.N.S.-D.; methodology, A.O.-P., H.H.-C., R.S.-D. and J.N.S.-D.; formal analysis A.O.-P., E.R.-R. and E.M.-C., and J.N.S.-D.; writing--original draft preparation A.O.-P., and J.N.S.-D.; writing--review and editing A.O.-P., V.M.C., and J.N.S.-D.; supervision A.O.-P., V.M.C. and E.R.-R. All authors have read and agreed to the published version of the manuscript.  
The theoretical work reported in this paper was partially funded by Tecnologico Nacional de Mexico/I.T. de Zacatepec, Laboratory of Benemeriata Autonoma Universidad de Puebla, and Centro de Viculacion y transfrencia de Tecnologia in BUAP whit acquisition of key TeeNN funds 6630.18-p and PRODEP program support with agreement key DSA/103.5/16/7344 in the Facultad de Ing. Quimica-BUAP.  
Not applicable.  
**Acknowledgments: The academic sub-direction of TecNM / IT of Zacatepec for their administrative and management support for this project.**  
**Conflicts of Interest: On behalf of all authors, the corresponding author states that there is no conflict of interest.**