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Mechanical Properties of Rubber Toughened Polyester Filled Carbon Black

This paper is focusing on mechanical properties of rubber toughened polyester filled carbon black (RPCB) for automotive parts and integrated circuits (IC) encapsulations applications. The samples were fabricated via hand lay-up and open molding technique in which 3 % of LNR was added as toughening agent in this composite and percentages of carbon black (CB) used vary from 0, 2, 4, 6, 8 and 10%. The mechanical properties were evaluated by impact and flexural testing. The result for each test was discussed to determine the most optimum loading of carbon black used to produce the composite. It was found that the addition of carbon black increased impact strength by 87%, flexural modulus by 33%, and flexural strength by 3%, at 4% of filler loading. The microstructures of the composites fracture surface were examined using a scanning electron microscope (SEM) to correlate and further explain the mechanical properties of the composites with morphology observation .