Analisis Pengaruh Waktu Hidrolisis Terhadap Sifat Mekanis Selulosa Kristalin Dari Campuran Serbuk Gergaji Kayu Belian, Bengkirai, Jati dan Meranti
DOI:
https://doi.org/10.26418/positron.v5i2.12136Keywords:
Selulosa kristalin, Derajat kristalinitas, Kekuatan tarik, Kekuatan putus, Modulus elastisitasAbstract
Telah dilakukan penelitian untuk menganalisis pengaruh waktu hidrolisis terhadap sifat mekanis selulosa kristalin dari campuran serbuk gergaji kayu belian, bengkirai, jati dan meranti. Isolasi selulosa kristalin dari serbuk gergaji dilakukan melalui 3 tahap yaitu ekstraksi, bleaching dan hidrolisis asam. Tahap ekstraksi menggunakan larutan alkohol-benzena (1:2) dan larutan NaOH dengan Na2S. Tahap bleaching menggunakan hipoklorit 30%. Sedangkan tahap hidrolisis asam menggunakan HCl 37% dengan asam: selulosa yaitu 4:1. Selulosa kristalin dibuat dengan variasi waktu hidrolisis yaitu 30 menit, 45 menit dan 90 menit. Nilai optimum diperoleh dari hasil hidrolisis 30 menit dengan derajat kristalinitas 74,49%, kekuatan tarik 20,09 kPa, kekuatan putus 17,64 kPa dan modulus elastisitas 1,3393 MPa. Nilai derajat kristalinitas berbanding lurus dengan parameter mekanis selulosa kristalin yang dihasilkan.
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