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Different concentrations of boron nitride (BN) were added to novolac resin in order to create a composite and modify the thermal conductivity which increased with increasing BN concentration. An instrument was used for the thermal conductivity measurements. Different size BN particles were also explored. The Maxwell-Eucken model was used to predict values which aligned well with experimental results.
A variety of nano and micro-sized boron nitride (BN) particles were dispersed in a polyimide (PI) precursor polyamic acid (PAA) using a surfactant in order to generate a thermally conductive polyimide composite film with excellent thermal properties. The observed thermal conductivities varied with the BN weight % and the particle size. BN weight % was raised as high as 30%, which resulted in a thermal conductivity of 1.2 W/mK. Glass transition and thermal decomposition temperatures are reported as 360°C and 536°C respectively.
The addition of ceramics, Boron Nitride and Boron-Aluminum Nitride, to an organosoluble polyimide (PI) film was investigated in this research. Test were performed to determine the effect of the addition of ceramics, on the thermal performance of the film, at room temperature. After appropriate treatments, the BN-PI elicited a thermal conductivity of 2.3 W/mK, as compared to the neat polyimide, with a thermal conductivity of 0.13 W/mK. In contrast, due to the porous like nature of the BN+AIN/PI composite film, the thermal conductivity of the film was lower, as compared to the neat polyimide.
This study aims to use Boron Nitride (BN) materials as thermo-conductive fillers to enhance the heat transfer in fluids. For this study, BN nanotubes, and nanospheres were added to fluids, to test for individual thermal enhancements. With the addition of BN nanotubes to water, the thermal conductivity of the fluid was enhanced by 2.6 times. Also noted, was the increase in conductivity of the fluid with the addition of BN nanospheres. As a test, nanotubes and nanospheres were collectively added to a fluid, to note their effects on the thermal conductivity of the fluid. This experiment showed the nanotube-nanosphere mixture was promising as a filler for fluids, as the thermal conductivity of the fluid increased, while the viscosity remained low.
Boron Nitride filled epoxy composites are explored on a thermal and mechanical scale within this research article. Researchers took special interest in the effect of filler content, mixing conditions and Boron Nitride agglomerate size, on the thermal conductivity of the composite. Experimental results alluded to an increase in thermal conductivity, as filler content, and mixing speed, time and temperature increased. On the other hand, as the Boron Nitride agglomerate size increased, the thermal conductivity of the composite decreased. As a results, sonication should be used, as opposed to mechanical mixing, to decrease the agglomerate size within the composite and therefore, increase the thermal conductivity.
