Abstract
The demand for efficient heat dissipation in electronic and electrical equipment enclosures is rising due to the pursuit of higher performance. However, the predominant challenge lies in the use of plastic as the primary material, which lacks favorable thermal conductivity (TC) despite its good machinability. Compared with common fillers, pyrrhotite (Pyr) exhibits moderate TC, insulation properties, and abundant active polysulfide sites on its surface. To turn waste into treasure, we prepared an economic thermal conductive material by powder mixing of Pyr tailings and waste polystyrene (WPS). Hexagonal and monoclinic crystalline Pyr were also prepared respectively, and the results showed that the hexagonal crystalline Pyr exhibited better application potential of TC filler. Furthermore, the strengthening mechanism of polysulfide bonds on the TC was analyzed and demonstrated. The results of the performance evaluation showed that the TC of the composite with optimal conditions improved by 1162.5 % compared to the WPS matrix. Based on the concept of green chemistry and the universality of raw materials, the research provides a method with excellent cost advantages in the future. This method also opens up a new vision for boundary applications such as heat exchange coatings. It is believed that this work provided a green and economic perspective for the disposal of sulfide minerals tailings and waste plastics.
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