Bio-based Epoxy Resin for High-Voltage Bushings: Insight into more sustainable Materials with improved Insulation Performance

Epoxy resins are widely used in electrical insulation and high-performance applications due to their excellent thermal, mechanical, and dielectric properties. In recent years, bio-based epoxy resins have gained attention as sustainable alternatives to conventional fossil-derived systems, offering reduced environmental impact while maintaining functional performance. This study investigates the potential of bio-based epoxy formulations for high-voltage insulation applications, benchmarked against petrochemical-derived systems. The bio-based resins, cured with anhydride hardeners, were fully compatible with standard casting and impregnation. DSC showed similar reaction enthalpies (200–230 J/g) and Tg (115–117 °C), while DMA revealed comparable storage moduli (G′) and Tα (135.5 °C), with…