Densification: A Route towards Enhanced Thermal Conductivity of Epoxy Composites

摘要: When an amorphous polymer is cooled under pressure from above its glass transition temperature to room temperature, and then the released, this results in a densified state of glass. This procedure applied epoxy composite system filled with boron nitride (BN) particles has been shown increase density composite, reduce enthalpy, and, most importantly, significantly enhance thermal conductivity. An epoxy-BN 58 wt% BN platelets average size 30 µm by curing pressures up 2.0 MPa cooling cured sample before releasing pressure. It found that conductivity increased approximately 3 W/mK for at ambient 7 W/mK; parallel, increases 1.55 1.72 ± 0.01 g/cm3. densification process much more effective enhancing than either simply applying consolidate mixture or during cure but removing temperature; last 5 W/mK. Furthermore, it corresponding effect on reversible; can be removed heating without reinstated again implies enhanced induced even prepared use