Influence of Solvent on the Structure and Performance of Cellulose

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INFLUENCE OF SOLVENT ON THE STRUCTURE AND PERFORMANCE OF CELLULOSE ACETATE MEMBRANES Oleh: Tia Lestari NIM. 101810301012 JURUSAN KIMIA FAKULTAS MATEMATIKA DAN ILMU PENGETAHUAN ALAM UNIVERSITAS JEMBER 2014 Influence Of Solvent On The Structure And Performance Of Cellulose Acetate Membranes Zhansheng Li *, Jizhong Ren, Anthony G. Fane, Dong Fei Li, Fook-Sin Wong Institute of Environmental Science and Engineering, School of Civil and Environmental Engineering, Nanyang Technological University, Innovation Centre, Block 2, Unit 237, 18 Nanyang Drive, Singapore 637723, Singapore Received 29 April 2005; received in revised form 2 December 2005; accepted 24 December 2005 Available online 31 January 2006 ABSTRAK Proses liquid-liquid demixing selulosa asetat (CA) dalam dua pelarut non- volatil yaitu N-metil-2-pirolidon (NMP) dan -Butyrolactone (GBL) yang terkoagulasi dalam bak air. Dikarenakan solvabilitas GBL untuk selulosa asetat relatif kecil dan interaksi yang lebih tinggi terhadap air, maka sistem CA/GBL/H2O mengalami delayed liquid-liquid demixing, sedangkan CA/NMP/H2O secara isntantaneous. Kualitas pelarut dan interaksi antara non- pelarut dan pelarut menghasilkan perilaku liquid-liquid demixing dan struktur membran yang berbeda. Dengan menyesuaikan konten GBL dalam campuran pelarut, sehingga dipelajari pengaruh pelarut pada struktur membran dan kinerja secara sistematis. Struktur membran mengikuti perubahan rasio NMP/GBL. Rasio kritis NMP/GBL tampaknya menunjukkan transisi dari struktur membran dari makrovoid menjadi spons. BAB 1. PENDAHULUAN 1.1 Latar Belakang Pencelupan merupakan metode yang paling umum digunakan dalam pembuatan membran (Baker, 2004), (Nunes, 2001), dan (Witte, 1996). Suatu larutan polimer yang homogen dicetak sebagai film tipis atau hollow (berserat) dan kemudian direndam ke dalam bak koagulasi yang berisikan larutan non- pelarut. Dikarenakan pertukaran pelarut dan non-pelarut terjadi antara larutan polimer dan bak koagulasi, fase pemisahan larutan polimer diinduksikan untuk membentuk fase-fase yang kaya polimer dan kurang polimer. Kemudian proses vitrifikasi atau gelasi berlangsung untuk memperbaiki struktur membran. Struktur membran dipengaruhi oleh termodinamika dan aspek kinetik dari sistem. Meskipun proses pembentukan membran memberikan fenomena interaksi yang berbeda, telah diterima secara luas bahwa liquid-liquid demixing memainkan peran penting dalam proses ini. Umumnya, proses delayed demixing biasanya menghasilkan membran yang tebal dan padat pada lapisan atas (Top-layer) dan sub-layer dengan struktur seperti spons, sedangkan instantaneous demixing biasanya menghasilkan

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Influence of Solvent on the Structure and Performance of Cellulose

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