Electronic Theses and Dissertation

Penelitian berkaitan dengan pembuatan biofilm tapioka/PVA/gliserol/kitosan terimobilisasi komposit serat abaca yang tersalut PVA-CuNPs sebagai biofilm konduktif. Penelitian ini bertujuan untuk membuat biofilm dengan karakteristik lentur dan memiliki hambatan listrik rendah. Penelitian ini dilakukan dengan menganalisis pengaruh variasi komposisi tapioka, PVA, gliserol, serat abaca, komposit serat-Cu, dan kitosan terhadap nilai ketebalan, daya serap air, dan sifat mekanik biofilm. Sintesis CuNPs dilakukan dengan metode reduksi larutan CuSO4.5H2O menggunakan asam askorbat. CuNPs diimpregnasi pada serat yang tersalut PVA dan diambil sebagai sampel uji hambatan listrik. Pengukuran nilai hambatan listrik serat abaca yang tersalut PVA-CuNPs menggunakan metode two-probe. Pembuatan biofilm dengan metode pencampuran larutan tapioka, larutan PVA, dan gliserol dengan pengadukan menggunakan magnetic stirrer pada suhu 60-70°C. Setelah larutan homogen dituang ke dalam cetakan akrilik dan dibiarkan selama 3 hari pada suhu ruang. Hasil uji hambatan listrik menunjukkan nilai konduktivitas serat yang tersalut PVA-CuNPs lebih tinggi daripada serat abaca tanpa perlakuan yaitu berturut-turut 5,032x10-5 S/cm dan 5,568x10-5 S/cm. Hasil pengujian biofilm menunjukkan sampel T20/P80/G-Cu memiliki karakteristik paling sesuai dengan tujuan penelitian ditinjau dari nilai ketebalan, daya serap air, kuat tarik, dan elongasi berturut-turut yaitu 0,163 mm; 88,651%; 60,7 MPa; 77,31%; dan mengandung serat yang terimobilisasi CuNPs.

Kata Kunci: Biofilm, Tapioka, PVA, Gliserol, Serat Abaca, CuNPs, Komposit Serat-Cu, Konduktivitas Listrik

This research is related to the production of tapioca/PVA/glycerol/chitosan-immobilized biofilms on abaca fiber composites coated with PVA-CuNPs as conductive biofilms. This study aims to create biofilms with flexible characteristics and low electrical resistance. The research was carried out by analyzing the influence of variations in the composition of tapioca, PVA, glycerol, abaca fiber, fiber-Cu composites, and chitosan on the biofilm's thickness, water absorption capacity, and mechanical properties. CuNPs synthesis was conducted through the reduction method of CuSO4.5H2O solution using ascorbic acid. CuNPs were impregnated onto PVA-coated fibers and taken as samples for electrical resistance testing. Measurement of electrical resistance values for abaca fibers coated with PVA-CuNPs was performed using the two-probe method. Biofilm production involved the mixing of tapioca solution, PVA solution, and glycerol with stirring using a magnetic stirrer at temperatures of 60-70°C. After homogenizing the solution, it was poured into acrylic molds and left for 3 days at room temperature. The results of the electrical resistance tests indicated that the conductivity of PVA-CuNPs-coated fibers was higher than untreated abaca fibers, with values of 5.032x10-5 S/cm and 5.568x10-5 S/cm, respectively. The biofilm testing results showed that the T20/P80/G-Cu sample had the most suitable characteristics for the research objectives in terms of thickness, water absorption capacity, tensile strength, and elongation, with values of 0.163 mm, 88.651%, 60.7 MPa, 77.31%, and containing immobilized CuNPs fibers, respectively. Keywords: Biofilm, Tapioca, PVA, Glycerol, Abaca Fiber, CuNPs, Fiber-Cu Composite, Electrical Conductivity