The Performance Research On The Thermal Conductivity Of Composite Materials Of ABS

Nowadays, plastic products were more widely used, so in some cases the requirements were also increasing, the thermal plastic was universal concerned because of its good performance. Therefore, development of a good thermal conductivity and comprehensive performance polymer composites had high practical significance. In this paper, acrylonitrile-butadiene-styrene copolymer (ABS) as the matrix resin, aluminum oxide, zinc oxide, aluminum as thermally conductive filler, by melt blending prepared the thermal ABS composite. The main contents are:(1) We studied the effect of the type and amount of the coupling agent on surface treatment of thermally conductive filler, and the effect of composites after the surface treatmentThe results show that the results of surface treatment is best when1%titanate agents102are used. The thermal conductivity can increase evidently after surface treatment.(2) Studied the effect on thermal properties and mechanical properties of composites about filler type, filler content, particle size of single component. Through filling2μm and4μm ZnO and three different size of Al2O3(4μm、6μm、40μm) as one-component filler into ABS, we could know that with the increasing of the content of fillers, the thermal conductivity of the composite increased, but the mechanical properties decreased significantly. We could also know that the composites could get the best thermal conductivity after filling the4pm Al2O3, as the less rigid of filler, the mechanical properties of materials were relatively better. The thermal conductivity of material could reach1.1W (m·K)-1, tensile strength23MPa, bending Strength45MPa, impact strength1.7kJ/m2when filling up to70%.(3)Using single fillers to improve the thermal conductivity of material could only through improving the filling volume, but the more we filled, the processing performance the worse. Filled ZnO could improve the processing performance of materials because of its thixotropic. Filled ABS with4μm or40μm aluminum oxide and2μm zinc oxide at50%filled mass, by measuring the rheological properties, we could see that the composites could get the best processability when we use the4μm aluminum oxide, and Al2O3:ZnO at6:4, at this time, melt viscosity could decreased to3.09Pa·s, and the thermal conductivity and mechanical properties was relatively good. (4) Filled ABS with two different particle size of alumina, we could increase the thermal conductivity of the material through the particle size of the filler compounded under certain amount of filler, when at the same filled mass, the thermal conductivity of composites could increased gradually with the increasing gap between the two kinds of particle size. When we used4μm and40/μm aluminum oxide to filled ABS at60%filled mass, we can see that the thermal conductivity of composites could increased1.0W/m·K, however, the mechanical properties of the composites reduced significantly with the increase of particle size. The tensile strength of30MPa or so down to about20MPa, and impact strength dropped from4.0kJ/m2to average2.5kJ/m2.(5) Al2O3because of its low thermally conductivity, could not be used to further increase the thermally conductivity of composites. Metal powder having a relatively larger thermal conductivity,so aluminum used as a thermally conductive filler could significantly increase the thermal conductivity of the composites, however, the mechanical properties of the material would reduce significantly. If we mixed the aluminum and aluminum oxide, zinc oxide to fill ABS,we can not only improving the thermal conductivity but also minimized the mechanical properties decreasing.