PENGARUH VARIASI KONSENTRASI ALKALI TERHADAP KEKUATAN TARIK DAN MORFOLOGI KOMPOSIT SERAT RAMI BERMATRIK POLYESTER

Diantoro, Hudi (2021) PENGARUH VARIASI KONSENTRASI ALKALI TERHADAP KEKUATAN TARIK DAN MORFOLOGI KOMPOSIT SERAT RAMI BERMATRIK POLYESTER. Skripsi thesis, Institut Teknologi Dirgantara Adisutjipto.

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Abstract

Natural fibers have hydrophilic (water-loving) properties and are difficult to combine with hydrophobic (water-repellent) matrices. The heavily soiled fiber surface affects the bond with the matrix. The fiber surface treatment can be carried out by chemical, physical or microbiological processes. A widely used method of removing contaminants from the fiber surface is the chemical treatment process. Chemicalcompounds that are widely used are sodium hydroxide (NaOH) The main components of this research are hemp fibers and polyester resin composites, which are manufactured using the hand lamination process. The composite consisted of random flax fibers, 15% by volume composite fibers, and dissolved NaOH at a concentration of 2.5%, 5%, 7%, 10% for 2 hours of immersion. Tensile test (ASTM D 638) and SEM (scanning electron microscope). The result of the highest tensile strength value is the composition with a 5% solution of 78.96 MPa. the lowest strength is found in a 10% solution of 37.66 MPa. The results of the SEM test of the test sample with the highest tensile strength at 5% composition show that if the fiber and matrix bond well, the SEM results show that the best solution is 5%, because the more concentrated the fiber, the more the solution/ becomes more brittle.

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