PENGARUH JENIS PELARUT TERHADAP MODIFIKASI SELULOSA BAKTERI DENGAN SILANE Si69 SEBAGAI FILLER KARET ALAM
DOI:
https://doi.org/10.22302/ppk.wp.v44i1.1110Keywords:
filler ramah lingkungan, kompatibilitas selulosa-karet, silane coupling agent (Si69), FTIR, XRFAbstract
Karet alam banyak digunakan dalam berbagai industri, namun membutuhkan filler untuk meningkatkan sifat mekanik dan ketahanannya. Filler konvensional seperti karbon hitam dan silika memiliki kelemahan terkait dampak lingkungan dan berat jenis yang tinggi, sehingga diperlukan alternatif yang lebih ramah lingkungan. Selulosa bakteri merupakan kandidat potensial berkat kemurnian tinggi, kekuatan mekanik yang baik, dan sifat biodegradabilitasnya. Namun, perbedaan polaritas antara selulosa bakteri yang hidrofilik dan karet alam yang hidrofobik menjadi tantangan dalam aplikasinya, sehingga diperlukan modifikasi permukaan. Penelitian ini bertujuan untuk mengeksplorasi modifikasi selulosa bakteri menggunakan silane coupling agent Si69 dengan dua jenis pelarut, yaitu N,N-dimethylacetamide (DMAc) dan etanol, serta mengevaluasi efek variasi rasio selulosa bakteri terhadap silane (1/2, 1/4, 1/6, dan 1/8). Proses modifikasi dilakukan dengan mereaksikan selulosa bakteri dan silane dalam pelarut yang dipilih, kemudian hasilnya dikarakterisasi menggunakan Fourier Transform Infrared Spectroscopy (FTIR) dan X-Ray Fluorescence (XRF). Hasil FTIR menunjukkan kemunculan puncak baru pada 1242 cm⁻¹ (gugus Si–O–Si) dan 688 cm⁻¹ (gugus S–S atau C–S), sedangkan analisis XRF mengkonfirmasi keberadaan unsur silikon (Si) dan sulfur (S) pada selulosa bakteri yang telah dimodifikasi. Modifikasi dengan pelarut DMAc menghasilkan kandungan silikon dan sulfur yang lebih tinggi dibandingkan etanol, menunjukkan efektivitas modifikasi yang lebih baik. Formula optimum diperoleh pada rasio 1/8 BC/Si69 (DMAc). Studi ini memberikan dasar untuk pengembangan filler berbasis selulosa bakteri yang lebih kompatibel untuk aplikasi karet karet.
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