In this study

the effects of three micro-scale and one nano-scale boron nitride sheets on the rheological properties and thermal conductivity of epoxy resins were investigated. The results show that the addition of large microscale boron nitride sheets is more beneficial to improve the thermal conductivity of resulting epoxy composites

and has relatively less influence on the viscosity. When 30% micro-scale boron nitride sheets PT110 and PT120 are added

the thermal conductivity values of modified epoxy resins increase from 0.18W·m–1 ·K–1 to 1.01W·m–1 ·K–1 and 0.94W·m–1 ·K–1

respectively. Compared with micro-scale boron nitride sheets

the nano-scale boron nitride sheets do not exhibit superiority to improve the thermal conductivity of epoxy resins

but can cause a significant increase in viscosity. The thermal conductivity of epoxy composites modified by different boron nitride were simulated by various theoretical models. Among them

the thermal conductivity values of modified epoxy resins predicted by the geometrical mean model are close to the experimental values. Compared with the unmodified epoxy resins

the epoxy composites modified by optimized boron nitride sheets shows almost the same curing temperatures and glass transition temperature

significantly increased flexural modulus but dramatically decreased flexural strength.