Main Article Content
Mechanical and thermal properties of composites, consisted of unsaturated polyester resin, reinforced by different kinds of natural materials (Orange peels and Date seeds) and industrial materials (carbon and silica) with particle size 98 µm were studied. Various weight ratios, 5, 10, and 15 wt. % of natural and industrial materials have been infused into polyester. Tensile, three-point bending and thermal conductivity tests were conducted for the unfilled polyester, natural and industrial composite to identify the weight ratio effect on the properties of materials. The results indicated that when the weight ratio for polyester with date seeds increased from 10% to 15%, the maximum Young’s modulus decreased by 54%. When the weight ratio was 5%, the maximum Young’s modulus, yield stress and ultimate tensile stress occurred in the polyester with date seeds. The results of tensile and flexural tests showed that the natural composite material has a higher strength than the industrial material. While the results of flexural tests manifested that the maximum improvement in the flexural strength is obtained for orange peels at 5 wt. %, where the maximum increasing percentage is 153.4% than pure polyester. The thermal conductivity of orange peels decreased to the half value when the weight ratio increased from 10% to 15%. The thermal conductivity for polyester with orange peels was greater than the thermal conductivity of polyester with date seeds with maximum percentage occurred at weight ratio 10% is 14.4%, but the thermal conductivity of the industrial composite material was higher than the natural composite material. Finally, the date seeds composite was a good insulator and it had a reduced heat transfer rate in comparison to the rest of the samples, also the maximum variation of temperature with time occurred in date seeds composite.
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 Arumuga Prabu V., Manikandan V., Uthayakumar M., Kalirasu S., "investigations on the mechanical properties of red mud filled sisal and banana fiber reinforced polyester composites", Materials Physics and Mechanics 15 (2012) 173-179 Received: November 1, 2012.
 Mohammed Razzaq Mohammed, '' Study of Some Mechanical Properties of Unsaturated Polyester Filled with the Seed Shells of Sunflower and Water-Melon'', Journal of Babylon University/Engineering Sciences/ No. (4)/ Vol. (21): 2013.
 Ishaya M. Dagwa,Josiah O. Ohaeri , " Property Evaluation of Hybrid OPEBF/Banana/Glass Fiber Reinforced Unsaturated Polyester Composites'' American Journal of Materials Science and Engineering, 2014, Vol. 2, No. 4, 45-53.
 Rafah A. Nassif "Effect of Chemical Treatment on The Some Electrical and Thermal Properties for Unsaturated Polyester Composites Using Banana Fibers" Eng.& Tech. Journal, Vol.28, No.10, 2010.
 K. Srinivasulu Reddy and D. Sreedhar, "Thermal Conductivity of Natural Fiber, Glass Fiber & CNTs Reinforced Epoxy Composites" International Journal of Current Engineering and Technology E-ISSN 2277 – 4106, P-ISSN 2347 – 5161. 2016.
 Dr. Sanaa A. A. Hafad, " Studying Some of Mechanical Properties (sawdust/UnSaturated Polyester) Composite in Salt Solution'', Eng. & Tech. Journal, Vol. 28, No. 16, 2010.
 M. Davallo, H. Pasdar, M. Mohseni, " Mechanical Properties of Unsaturated Polyester Resin", International Journal of ChemTech Research, CODEN (USA): IJCRGG ISSN: 0974-4290, Vol.2, No.4, pp 2113-2117, Oct-Dec 2010.
 Y. He, Intel Corporation; G.S. Ng, Massachusetts Institute of Technology and Intel Corporation, "Hot Disk: A Transient Plane Source Technique for Rapid Thermal Conductivity Measurement".
 C. Buratti, E. Belloni Email author ,L. Lunghi ,M. Barbanera " Thermal Conductivity Measurements By Means of a New ‘Small Hot-Box’ Apparatus: Manufacturing, Calibration and Preliminary Experimental Tests on Different Materials", International Journal of Thermophysics, 22 February 2016, DOI: 10.1007/s10765-016-2052-2