Synergistic Enhancement of Electrical, Thermal, and Mechanical Properties in PFA Composites via Graphene/Multi‐Walled Carbon Nanotube Hybrid Fillers

Abstract

Perfluoroalkoxy (PFA) resin is a critical engineering fluoroplastic owing to its exceptional chemical and thermal resistance; however, inherent electrical insulation and moderate mechanical strength restrict its application in extreme environments. Herein, a hybrid filler system comprising graphene nanoplatelets (GNPs) and multi‐walled carbon nanotubes (MWCNTs) is introduced to synergistically enhance the multifunctional properties of PFA. To ensure uniform dispersion, ultrasonic solution dispersion coupled with melt extrusion was employed. Results demonstrate that an optimal formulation of 1.0 phr GNPs and 6.0 phr MWCNTs yields superior filler dispersion. Mechanistically, the one‐dimensional MWCNTs intercalate into the two‐dimensional GNPs to provide robust steric hindrance against graphene restacking, constructing a dense three‐dimensional interconnected network. Consequently, Raman spectroscopy revealed an I 2D / I G ratio of 1.156, indicating effective exfoliation. The PFA crystallite size was refined to 7.906 nm with composite crystallinity reaching 49.98%, while the temperature at 50% weight loss T 0.5 increased to 554.85°C. Crucially, the composite achieved an electrical conductivity of 4.51 S/m. Mechanically, the yield strength improved to 35.60 MPa while retaining an elongation at break of 81.53%, effectively circumventing typical severe embrittlement. This study provides a robust pathway for developing high‐performance PFA composites tailored for antistatic, high‐load, and high‐temperature applications.