Investigasi Karakteristik Mekanis Komposit Berpenguat Serat Kenaf/Microcrystalline Cellulose

Rizki Nur Ramadhani, Tarsono Dwi Susanto, Sakuri Sakuri

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AbstrakTujuan penelitian ini untuk mengetahui karakteristik serat kenaf yang diperlakukan alkali dengan tanpa perlakuan. Serat direndam dengan aquades dan sodium hidroksida pada konsentrasi 6 %, selama 2 jam, 4 jam, dan 6 jam. Serat dipotong sepanjang 10 mm untuk disiapkan dalan cetakan komposit. Unsaturated polyester dicampur dengan microcrystalline cellulose dengan putaran 250 Rpm, temperatur sebesar 40oC, selama 30 menit menggunakan metode vacuum infusion . Hasil pengujian menggunakan universal machine testing menghasilkan kekuatan tarik serat tanpa perlakuan sebesar 60.69 MPa dan meningkat sebesar 65.65 MPa setelah perlakuan alakali dan penambahan microcrystalline cellulose. Modulus elastisitas juga mengalami peningkatan dari 1457,11 MPa menjadi 1888,11 MPa setelah perlakuan alkali. Pengujian lentur menunjukan adanya peningkatan dengan perlakuan alkali dan penambahan microcrystalline cellulose dari 75,25  MPa menjadi 89, 68  MPaKata Kunci : Serat kenaf, microcrystalline cellulose, komposit, karakteristik Abstract The purpose of this study was to determine the characteristics of kenaf fiber which was treated with alkali and without treatment. The fiber was soaked with distilled water and sodium hydroxide at a concentration of 6%, for 2 hours, 4 hours, and 6 hours. Fibers were cut to 10 mm lengths to be prepared in composite molds. Unsaturated polyester mixed with microcrystalline cellulose with a rotation of 250 Rpm, a temperature of 40oC, for 30 minutes using the vacuum infusion method. The test results using universal machine testing resulted in fiber tensile strength without treatment of 60.69 MPa and an increase of 65.65 MPa after alkali treatment and the addition of microcrystalline cellulose. The modulus of elasticity also increased from 1457.11 MPa to 1888.11 MPa after alkaline treatment. Flexural testing showed an increase with alkali treatment and the addition of microcrystalline cellulose from 75.25 MPa to 89.68 MPaKey Word: Kenaf Fiber, microcrystalline cellulose, composite, Characteristics

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