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Abstract: Mechanical and physical properties, such as tensile strength, elongation at break, modulus of elasticity, Shore D hardness, melt flow rate (MFR), and electrical and thermal conductivities of composites with high density polyethylene matrix reinforced with Al powders were investigated experimentally. Measurements of the mechanical and physical properties were performed up to a reinforcing component concentration of 30% volume Al powder and compared with mathematical models from the literature. The obtained results have shown that experimental data were in good agreement with theoretical data. The ultimate tensile strength (UTS) and elongation at break decreased with increasing Al powder content, which was attributed to the introduction of discontinuities in the polymer structure, and modulus of elasticity increased with increasing Al content. The composite preparation conditions allowed the formation of a random distribution of metallic particles in the polymer matrix volume for system high density polyethylene-Al (HDPE-Al). There was a cluster formation of Al particles at higher Al contents in the polymer matrix. Electrical and thermal conductivity values of HDPE-Al composites were higher than pure HDPE values.

[1]Agari, Y., Ueda, A., Tanaka, M., Nagai, S., 1990. Thermal conductivity of a polymer filled with particles in the wide range from low to super-hight volume content. Journal of Applied Polymer Science, 40(5-6):929-941.

[2]ASTM C177-04, 2004. Standard Test Method for Steady-State Heat Flux Measurements and Thermal Transmission Properties by Means of the Guarded-Hot-Plate Apparatus. ASTM International, West Conshohocken, PA, USA.

[3]ASTM D1238-10, 2010. Standard Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer. ASTM International, West Conshohocken, PA, USA.

[4]ASTM D2240-05, 2010. Standard Test Method for Rubber Property—Durometer Hardness. ASTM International, West Conshohocken, PA, USA.

[5]ASTM D257-07, 2007. Standard Test Methods for DC Resistance or Conductance of Insulating Materials. ASTM International, West Conshohocken, PA, USA.

[6]ASTM D3835-08, 2008. Standard Test Method for Determination of Properties of Polymeric Materials by Means of a Capillary Rheometer. ASTM International, West Conshohocken, PA, USA.

[7]ASTM D638-10, 2010. Standard Test Method for Tensile Properties of Plastics. ASTM International, West Conshohocken, PA, USA.

[8]Bader, M.G., 2002. Selection of composite materials and manufacturing routes for cost-effective performance. Composites Part A: Applied Science and Manufacturing, 33(7):913-934.

[9]Einstein, A., 2005. Einstein’s Annalen Papers: The Complete Collection 1901–1922. In: Renn, J. (Ed.), Wiley-VCH Verlag GmbH, Germany (in German).

[10]Gavarri, J.R., Tortet, L., Musso, J., 1999. Transport properties and percolation in two-phase composites. Solid State Ionics, 117(1-2):75-85.

[11]Jang, J., Han, S., 1999. Mechanical properties of glass-fiber Mat/PMMA functionally gradient composites. Composites Part A: Applied Science and Manufacturing, 30(9):1045-1053.

[12]Kovacs, J.Z., Velagala, B.S., Schulte, K., Bauhofer, W., 2007. Two percolation thresholds in carbon nanotube epoxy composites. Composites Science and Technology, 67(5):922-928.

[13]Kuo, C.H., Gupta, P.K., 1995. Rigidity and conductivity percolation thresholds in particulate composites. Acta Metallurgica et Materialia, 43(1):397-403.

[14]Lux, F., 1993. Models proposed to explain the electrical conductivity of mixtures made of conductive and insulating materials. Journal of Materials Science, 28(2):285-301.

[15]Nielsen, L.E., 1974. The thermal and electrical conductivity of two-phase systems. Industrial and Engineering Chemistry Fundamentals, 13(1):17-20.

[16]Nielsen, L.E., Landel, R.F., 1994. Mechanical Properties of Polymers and Composites (2nd Ed.). Marcel Dekker, NY, USA.

[17]Park, C.H., Saouab, A., Bréard, J., Han, W.S., Vautrin, A., Lee, W.I., 2009. An integrated optimisation for the weight, the structural performance and the cost of composite structures. Composites Science and Technology, 69(7-8):1101-1107.

[18]Progelhof, R.C., Throne, J.L., Ruetsch, R.R., 1976. Methods for predicting the thermal conductivity of composite systems: a review. Polymer Engineering and Science, 16(9):615-625.