neobjavljeni prilog sa skupa
High density polyethylene is the most common choice for geothermal heat source pipes, because of its flexibility, low maintenance costs, ease of processing, long life in the soil and reliability. One of the important properties for better heat exchange is thermal conductivity of materials. Plastic materials exhibit rather low thermal conductivity which can be enhanced by the incorporation of particles with higher thermal conductivity, mainly metal powders, carbon additives and mineral fillers. The previous research found that the addition of 10% by volume of copper raised the thermal conductivity of polyethylene by almost 100%, with the increase of tensile modulus and tensile strength, but reducing strain at yield. Silica did not have a significant impact on the thermal conductivity, but it additionally increased the tensile modulus of polyethylene and copper mixture, while simultaneously maintaining the same level of stress at yield (tensile strength) and reducing strain at yield. The next step, presented in this research, was the addition of various percentages of compatibilizer, HDPE functionalized with maleic anhydride, to investigate the effect on tensile properties. The mixtures studied were of HDPE with 10% by volume of copper with the addition of and 0, 2 and 4% by mass of silica and 5 and 10% by mass of compatibilizer. The tests showed that the highest values of stress at yield, close to the one of virgin HDPE, were obtained with the 10% of Cu, 4% of silica and 5% of compatibilizer. All mixtures showed increase in tensile modulus compared to the virgin HDPE, the highest one (44% increase) being the previously mentioned combination of copper, silica and compatibilizer in 10, 4 and 5%, respectively. The highest strain at yield, although 7% lower than the one of virgin HDPE, was obtained with HDPE/Cu mixture without silica or compatibilizer. The higher percentage of compatibilizer (10%) compared to the lower one (5%) had very low impact on tensile modulus, stress at yield and strain at yield of HDPE/Cu/silica mixtures. It only impacted the HDPE/Cu mixture where 10% of compatibilizer increased the value of strain at yield compared to the 5% of compatibilizer.
compatibilizer; copper; polyethylene; silica; tensile properties
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