Abstract
The present research is a promising approach for the simultaneous enhancement of thermal transport phenomenon with combination of Boron Nitride (BN) and polyester resin by creating a continuous heat flow path with sufficient thermal stability. The main goal of this scientific research is to understand and define the contributing effect of the filler network with focus on filler size, type and relative composition on the thermal properties of these composites. BN and BN with different particle sized hybrids in their mono-modal as well as bi-modal formulations shows the prospect of designing a smart, cost-efficient and multi-functional hybrid composite which is favourable for both the heat management and thermal stability of the polyester matrix. In this study, thermal conductive formulations with varying filler weight fractions from 0 to 35 wt% by adding BN and BN hybrids with two particle sizes were successfully established. The addition of these fillers influence the thermal conductivity according to the packing factor due to the shape of the particles, particle size, agglomerate formation and the increase in viscosity due to filler loading. Besides this, the mixing speed, mixing time and mixing temperature also play an important part during formation of the percolation threshold or the conductive pathways. At higher temperatures of 70 °C and medium speeds of about 80 rpm for 30 min mixing time the BN-polyester composites with 35 wt% show the maximum effective thermal conductivity. The established hybrid system with two sizes of fillers show improved thermal conductivity and thermal stability against oxidative degradation; also the measured values were significantly improved. Therefore, with proper mixing speed, mixing time and optimal temperature, BN-polyester and multi-sized BN-hybrid composites can successfully be used in PCB circuitry and other micro-electronic application areas where high thermal management is a priority.
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