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Irwan Ginting Suka
Jurusan Kimia FMIPA, Universitas Lampung, Jl. Sumantri Brojonegoro No. 1 Bandar Lampung, 35144
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry

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Pembuatan Membran Polimer Elektrolit Berbasis Polistiren Akrilonitril (SAN) untuk Aplikasi Direct Methanol Fuel Cell Suka, Irwan Ginting; Simanjuntak, Wasinton; Dewi, Eniya Listiani
Jurnal Natur Indonesia Vol 13, No 1 (2010)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (309.762 KB) | DOI: 10.31258/jnat.13.1.1-6

Abstract

In this study, electrolyte membranes based on polystyrene acrylonitrile (SAN) for Direct Methanol Fuel Cell applicationwere prepared. The preparation was carried out in two steps. The first step was introduction of additives, silicaand zeolite, as reinforcing agent on SAN, to obtain silica-reinforced SAN membrane, specified as SAN-Si, andzeolite-reinforced SAN membranae, specified as SAN-Z. The two reinforced membranes were then subjected tosulphonation using sulphuric acid, and the sulphonated membranes are specified as S-SAN-Si and S-SAN-Z,respectively. The characteristics of the membrane were described in terms of the degree of sulphonation, ionicconductivity, methanol permeability, and percentage of swelling in water and methanol. The results obtaineddemonstrated that additives result in significant reduction of methanol crossover, as reflected by lower values ofmethanol permeability than that obtained for the membrane without additive. It was also found that zeolite functionsrelatively better than silica. For zeolite-modified membrane (S-SAN-Z) the ionic conductivity of 10.05 x 10 -6 S/cmwas achieved. The membrane also marked by methanol permeability of 0.52 x 10 -6, percentage of swelling of 5.12%in water and 2.58% in methanol. Thermal analysis using DSC technique revealed changes in glass transition fromthe original sample, in which the glass transition of the original sample, SAN, (55 0C), sulphonated SAN, S-SAN,(83.360C), silica-modified membrane S-SAN-Si (79.860C), and zeolite-modified membrane S-SAN-Z (79.290C). Additionof additive was also found to influence the surface characteristics of the membranes as revealed by SEM analysis,in which the surface changed from smooth for the original sample into rough for the reinforced samples with bothadditives.
Kopolimerisasi Grafting Campuran N-Isopropilakrilamida dan Glisidil Metakrilat pada Film Polietilen yang Diinduksi oleh Sinar Ultraviolet Suka, Irwan Ginting
Jurnal Natur Indonesia Vol 10, No 2 (2008)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (313.071 KB) | DOI: 10.31258/jnat.10.2.104-111

Abstract

Liquid phase ultraviolet irradiation was used to graft the mixtures of N-isopropylacrylamide and glycidyl methacrylateto a linear low-density polyethylene film (thickness of 30 μm) surface. Xanthone was used as photoinitiator, whichwas coated on the film surface earlier. The surface of the grafted polyethylene samples were characterized byattenuated total-reflection IR spectroscopy and scanning electron microscopy. Elemental analysis indicated thatthe NIPAAm fraction with respect to GMA in the graft copolymer increased with increasing NIPAAm ratio in thecomonomer feed solution. The reactivity ratios of NIPAAm and GMA monomers determined in the present graftcopolymerization system were found to be 0,31 ± 0,1 and 4,8 ± 0,2, respectively. It was found that the epoxy groupsof GMA-grafted chains in the NIPAAm/GMA-grafted films have the ability to react with ethylenediamine (En). Theaminated NIPAAm/GMA-grafted film had an excellent ability to adsorb cupric ion. The temperature-responsivecharacter of the resulting grafted films was evaluated by measuring the water absorbency of the grafted NIPAAm/GMA when immersed in water and/or methanol at 5 to 50 0C.
EFFECT OF MIXED SOLVENTS CONSISTING OF WATER AND ORGANIC SOLVENT ON PREPARATION OF MEDIUM-RESPONSIVE GRAFTED CELLULOSE FILM BY MEANS OF PHOTOGRAFTING Suka, Irwan Ginting
Makara Journal of Science Vol. 10, No. 2
Publisher : UI Scholars Hub

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Abstract

Cellulose having a medium-responsive function were synthesized by photografting of methacrylic acid (MAA) on regenerated cellulose film (thickness = 20 µm) at 60°C using mixed solvent consisting of water and organic solvents such as acetone and methanol. Xanthone was used as photoinitiator by coating on the film surfaces. A maximum percentage of grafting was observed at a certain concentration of organic solvent. MAA-grafted cellulose films produced showing homogeneous distribution of grafted chains, which was examined by scanning electron microscopy. The modified films also exhibit medium responsive character, it shrinks in acidic and swells in basic solution. Moreover, the grafted film exhibited the ability to absorb copper ion, which was not influenced by the solvent used in grafting processes.
KOPOLIMERISASI CANGKOK (GRAFT COPOLYMERIZATION) N-ISOPROPILAKRILAMIDA PADA FILM SELULOSA YANG DIINDUKSI OLEH SINAR ULTRAVIOLET DAN KARAKTERISASINYA Suka, Irwan Ginting
Makara Journal of Science Vol. 14, No. 1
Publisher : UI Scholars Hub

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Abstract

Co-Authors Eniya Listiani Dewi Wasinton Simanjuntak