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In various industrial applications standard heat exchangers made of metal are replaced with alternatives such as polymer composites. Resistance to corrosion, chemical stability, hydrophobicity of material and good rheological properties makes high-density polyethylene (HDPE) possible substitute for convectional materials. The lack of HDPE thermal properties (but typical for metals - high thermal conductivity and heat capacity) could be improved by the addition of adequate fillers. In this paper, composites with two kinds of filler expanded graphite (EG) and boron nitride (BN) with micro-sized particles, were used in high-density polyethylene (HDPE) matrix. Mass ratio of both fillers up to 25 wt.% in HDPE matrices were prepared together with compatibilizer, for which polyethylene-grafted-maleic anhydride (PE-g-MAH) was used. Preparation of samples included melt mixing in a compounder and hot-pressing in the moulds. Compounds were subject for testing on thermal conductivity (TC). With the addition of fillers TC is expected to increase compared to the pure HDPE. Micro-composite with BN as a filler is supposed to have better results in testing for the same mass ratio as in composite with EG.
boron nitride; expanded graphite; polyethylene; polymer composite; thermal conductivity
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