Influence of Inorganic Fillers on the Mechanical Properties of Polypyrrole Composite Thin Films

Conductive polymers such as polypyrrole (PPy) have attracted significant interest for flexible electronic applications due to their electrical conductivity, chemical stability, and ease of synthesis. However, pure PPy films often exhibit limited mechanical robustness, which can restrict their long-term performance in flexible devices. Incorporating inorganic fillers into the polymer matrix represents a promising strategy to improve the mechanical stability of conductive polymer films while maintaining their functional properties.

In this work, composite thin films based on p-toluenesulfonic acid-doped polypyrrole (PPy-TSA) incorporating inorganic fillers such as graphene (GR), carbon nanotubes (CNTs), and zeolite (ZE) were investigated. The composite films were obtained by electrochemical polymerization using a galvanostatic method, in which pyrrole was polymerized in the presence of the inorganic components dispersed in the electrolyte solution. The inorganic fillers were used as commercially available materials, while the PPy matrix was synthesized in situ during the electrochemical process.

The morphology of the films was analyzed by scanning electron microscopy (SEM), highlighting the dispersion of the inorganic components within the polymer matrix and their effect on the structural organization of the films. Mechanical performance was evaluated through flexibility and repeated bending tests in order to assess the structural integrity of the composite films under deformation.

The results indicate that the incorporation of inorganic fillers contributes to improved mechanical stability and resistance to structural damage during bending, suggesting a reinforcing effect within the PPy matrix. These findings highlight the potential of inorganic filler-reinforced polypyrrole films for flexible electronic applications where both electrical functionality and mechanical durability are required.