Study on Preparation and Properties of Al2O3/Polyolefin Composites
In order to investigate the structure and properties of Al2O3/polyolefin composites,spherical Al2O3 was pretreated with a silane coupling agent,and high density polyethylene(HDPE)/polypropylene(PP)composites were prepared by primary mixing and melt blending with pretreated Al2O3 as filler and high density polyethylene(HDPE)/polypropylene(PP)mixture(mass ratio 5∶95)as matrix.The investigation of the influence of the mass fraction of Al2O3 on the structure and properties of the composites was studied.The results showed that the addition of Al2O3 significantly enhanced the thermal conductivity of the composites.Specifically,the thermal conductivity increased proportionally with the mass fraction of Al2O3.When the Al2O3 mass fraction reached 25%,the thermal conductivity of the composite measured 0.331 W/(m∙K),which was 231%higher than that of the pure polyolefin matrix material.Moreover,the presence of Al2O3 particles with high filler content led to a noticeable reduction in gaps within the composite,thereby facilitating the construction of thermal conductivity pathways.Additionally,the incorporation of a lower content of rigid Al2O3 particles improved crystallization ability of the polymer.Notably,the addition of the spherical Al2O3 also significantly enhanced the melt flow rate of the composites,and improved its processing performance.
PolypropyleneHigh density polyethyleneAluminaThermal conductivity
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