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SINTESIS MEMBRAN KITOSAN FOSFAT DAN MEMBRAN KOMPOSIT UNTUK APLIKASI SEL BAHAN BAKAR

Synthesis of Phosphorylated Chitosan Membrane and Composite Membrane for Fuel Cell Applications

Undergraduate Theses from JBPTITBPP / 2017-09-27 11:42:36
Oleh : ANNISA RIFATHIN (NIM 10505046), S1 - Department of Chemistry
Dibuat : 2009, dengan 7 file

Keyword : fuel cells, phosphorylated chitosan, polysulfone, composite membrane

Membran kitosan dapat digunakan sebagai membran pada sel bahan bakar jenis Polymer Electrolyte Membrane Fuel Cell (PEMFC), namun konduktivitasnya lebih rendah dibandingkan Nafion. Sebagai upaya untuk meningkatkan konduktivitas kitosan dan menurunkan permeabilitas terhadap metanol, pada penelitian ini telah dilakukan fosfatasi kitosan dengan menggunakan pereaksi asam fosfat, urea, dan N,N-dimetilformamida (DMF) di dalam microwave oven dengan daya 490 Watt. Disamping itu telah dilakukan pula pembuatan membran komposit polisulfon-kitosan dan polisulfon-kitosan fosfat dengan dua metoda, yaitu pertama, metoda tekan-panas pada suhu 130oC dan 170oC dan kedua, metoda pelapisan di mana larutan kitosan dicetak di atas membran polisulfon. Membran komposit yang dibuat dengan metoda kedua memiliki gaya adesi yang lebih kuat di antara kedua polimer. Nilai konduktivitas membran kitosan fosfat lebih tinggi dan nilai permeabilitas metanol lebih kecil dibandingkan membran kitosan maupun membran komposit Hasil analisis termal menunjukkan membran komposit mempunyai ketahanan termal yang lebih tinggi dibanding kitosan terfosfatasi. Dari hasil karakterisasi berbagai jenis membran tersebut dapat disimpulkan bahwa membran kitosan fosfat memberikan kinerja yang paling baik dibandingkan membran kitosan maupun membran komposit.

Deskripsi Alternatif :

Chitosan membrane can be used as a membrane for Polymer Electrolyte Membrane Fuel Cell (PEMFC), but its conductivity is lower than Nafion. Efforts have been done in this work to increase the conductivity and to decrease the permeability towards methanol of chitosan. It has been phosphorylated using phosphoric acid, urea, and N,N-dimethylformamide (DMF) in a 490 Watt microwave oven. In addition, composite membranes of polysulfone-chitosan and polysulfone-phosphorylated chitosan have also been prepared. Two kinds of method were done, first, the hot-press method using temperatures of 130oC and 170oC, and the second one, casting chitosan solution on polysulfone membrane. The results showed that composite membranes made by the second method have stronger adhesion between the two polymers. The conductivity of phosphorylated chitosan is higher and the permeability of methanol is lower than both chitosan and composite membranes. The thermal analysis of those membranes showed that the composite membrane has higher thermal resistance than the phosphorylated chitosan. From these results it can be concluded that compared to chitosan and compiste membranes, the phosphorylated chitosan membranse provide better performances as fuel cell membranes.

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