Inorganic and Physical Chemistry Research Division, Faculty of Mathematic and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha No. 10, Bandung 40132, Indonesia

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Synthesis of Narrow Polydispersity Block Copolymers of PtBA-PS by Novel RAFT Polymerization Technique Arcana, M.; Nagesh, K.; Rama, Ramakrisnan
Journal of Engineering and Technological Sciences Vol 36, No 1 (2004)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (242.425 KB) | DOI: 10.5614/itbj.eng.sci.2004.36.1.5


The synthesis of narrow disperse polystyrene (PS) and poly-t-butylacrylate (PtBA) was carried out by copolymerization using benzyldithiobenzoate as the chain transfer agent (CTA). Benzyl dithiobenzoate as a reversible addition-fragmentation chain transfer (RAFT) agent has high transfer coefficient in polymerization of styrene to produce PS with higher molecular weight than that of calculated, in contrary with polymerization of t-butylacrylate to produce PtBA. These results were attributed to instability the benzyl dithiobenzoate as RAFT agent under the reaction conditions. PS as a macro-CTA is not active for t-butylacrylate polymerization due to low transfer coefficient. On the other hand PtBA as the macro-CTA is active to polymerize styrene to produce PtBA-PS block copolymer with high transfer coefficient if PtBA as macro-CTA have narrow polydispersity. The RAFT agent appears to degrade over a period of time when it is left at room temperature, which was evident from the results of PtBA.
Structure and Properties of Polymers Prepared by Polymerization of 2,2-Dimethyl-1,3-Propandiol and ε-Caprolactone Monomer I Made Arcana; M. Hasan; Shinta Dewi Anggraini; Asti Ardhyo Febrianti; Aditya Ardana
Journal of Mathematical and Fundamental Sciences Vol. 41 No. 2 (2009)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/itbj.sci.2009.41.2.2


Poly(ε-caprolactone) (PCL) is very attractive synthetic polymer due to its properties, such as a high permeability, the lack of toxicity, and also biodegradability. However, it has limited application because of low melting point (60 °C), high crystallinity, and brittleness. The aim of the experiments is designed to improve the properties of PCL by formation of their polymers with 2,2-dimethyl-1,3-propandiol monomers with various chain length as a raw material to prepare poly(urethane-ester). These polymers were synthesized by a ring-opening polymerization of 2,2-dimethyl-1,3-propandiol and ε-caprolactone monomers in various composition in the presence of 1-hydroxy-3-chloro-tetraisobuthyldistanoxane as a catalyst. Polymers were characterized by analysis of functional groups (FTIR), microstructure (1H and 13C NMR), viscosity, hydroxyl number, and also melting point of polymers (DSC). Based on the structure analysis indicate that polymerization of 2,2-dimethyl-1,3-propandiol and ε-caprolactone monomers produced polymers with various molecular weights, which depend on the ratio of ε-caprolactone / 2,2-dimethyl-1,3-propandiol used in polymerization. The reactivity of CL monomer decreases to the active site of polymers with longer chain size. The melting points of polymers increase with the increasing of ε-caprolactone composition used in polymerization, whereas hydroxyl number decreases.
Journal of Engineering and Technological Sciences Vol 52, No 1 (2020)
Publisher : ITB Journal Publisher, LPPM ITB

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The polymer electrolyte membrane is a main component of lithium-ion batteries (LiBs), serving as separator and electrolyte. In this work, we prepared biopolymer electrolyte (BPE) membranes of lithium perchlorate (LiClO4)-complexed methyl cellulose (MC). Methyl cellulose (MC), a cellulose derivative, has attractive properties for use as biopolymer electrolyte. The bulkier anion size of lithium salt (LiClO4) significantly enhances the performance of biopolymer electrolyte (BPE) membranes. The fabricated biopolymer electrolyte (BPE) membranes were characterized by FTIR, EIS, tensile tester, XRD and TGA. Biopolymer electrolyte membranes with various weight percentages of LiClO4 salt (0%, 5%, 10%, 15%, and 20%) were prepared using a simple solution casting technique. Incorporation of 10% weight of LiClO4 into the MC-based host polymer was selected as optimum condition, because this yielded good conductivity (3.66 x 10-5 S cm-1), good mechanical properties (tensile strength 35.97 MPa and elongation at break 14.47%), good thermal stability (208.4 to 338.2 °C) as well as ease of preparation and low cost of production. Based on its characteristics it can be stated that the 10% LiClO4-complexed MC membrane meets the requirements as a candidate separator for lithium-ion battery application.
Isolasi Nanokristalin Selulosa Bakterial dari Jus Limbah Kulit Nanas: Optimasi Waktu Hidrolisis Anwar, Budiman; Bundjali, Bunbun; Arcana, I Made
Jurnal Kimia dan Kemasan Vol. 38 No. 1 April 2016
Publisher : Balai Besar Kimia dan Kemasan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1408.129 KB) | DOI: 10.24817/jkk.v38i1.1973


Nanokristalin selulosa (NCC) adalah bionanomaterial yang terbarukan, berkelanjutan, ramah lingkungan, dan potensi penggunaannya sangat luas. Salah satu metode untuk mengisolasi NCC dari selulosa adalah dengan hidrolisis menggunakan asam. Waktu hidrolisis adalah salah satu faktor yang sangat menentukan keberhasilan isolasi NCC disamping konsentrasi asam dan suhu hidrolisis. Penelitian ini difokuskan untuk memperoleh waktu hidrolisis optimum untuk isolasi NCC. Selulosa bakterial (BC), yang disintesis menggunakan media kultur jus limbah kulit nanas, digunakan sebagai sumber selulosa yang murah dan ramah lingkungan. Optimasi waku hidrolisis dikarakterisasi dengan stabilitas dispersi, %-hasil, dan diameter partikel rata-rata yang diukur menggunakan Particle Size Analyzer (PSA). Waktu optimum hidrolisis yang memberikan dispersi stabil dengan %-hasil terbanyak (62%) dan ukuran partikel terkecil (diameter rata-rata 41,6 nm) adalah 25 menit pada suhu dan konsentrasi asam tertentu. Analisis FTIR memperlihatkan spektrum NCC mirip dengan BC-asal dengan puncak-puncak serapan khas untuk selulosa. Sedikit pergeseran terjadi pada puncak sekitar 2900 cm−1 dan 1430 cm−1 yang disebabkan oleh adanya peningkatan derajat kristalinitas, hal ini menunjukkan pula bahwa BC telah berubah menjadi NCC. Pengamatan dengan Transmission Electron Microscopy (TEM) terhadap NCC memperlihatkan morfologi yang berbentuk jarum.