Design And Manufacturing Of Functıonalized Hexagonal Boron Nitride Reinforced Multı-Scale Epoxy Composıtes With Enhanced Thermal Conductivity

This thesis tackles the issue of poor heat dissipation in aerospace composites by using a multi-scale interface engineering strategy with hexagonal boron nitride (h-BN) and carbon fibers (CF) in epoxy. By optimizing h-BN content and applying surface modifications (acid/thermal treatments and silanization), thermal conductivity improved by up to 123%, with enhanced mechanical strength. Amino-silane treatment further increased conductivity but introduced brittleness. Incorporating modified h-BN into CF composites via electrospraying formed aligned thermal networks, achieving 2.31 W/mK thermal conductivity and a 127% rise in flexural modulus. The study shows that interface engineering can significantly improve both thermal and mechanical performance for aerospace use.