Electrically Conductive Epoxy Composites Reinforced with Aniline‐<i>p</i>‐Phenylenediamine Copolymer Nanofibers in Microscale Length

Abstract Recently, the development of conductive epoxy nanocomposites has garnered significant attention due to their potential applications in advanced electronic devices. However, uniform dispersion of nanofillers in epoxy matrix remains a challenge in the composite engineering, directly governing the interfacial adhesion and macroscopic performance. In this study, aniline‐p‐phenylenediamine copolymer (P(ANI‐PDA)) nanofibers with microscale length are successfully synthesized via interfacial polymerization methods, which are employed as conductive nanofillers in epoxy nanocomposites. The imine groups in the copolymer backbone enhance its dispersion within the epoxy matrix, as evidenced by the differential scanning calorimetry (DSC) analysis, which confirms interactions between P(ANI‐PDA) and epoxy. The optimal mechanical performance is achieved at 5 wt.% loading of P(ANI‐PDA), where the epoxy nanocomposites exhibit a tensile strength of 83.83 ± 2.62 MPa with a 11% highe than that of pure epoxy (74.70 ± 0.94 MPa). With increasing the loading of P(ANI‐PDA) to 15 wt.%, the volume resistivity of epoxy nanocomposites reaches 7.23 × 10 6 Ω cm, which is six orders of magnitude lower than that of pure epoxy (6.50 × 10 12 Ω cm), suggesting the potential application in the antistatic field of materials.