Sunit Hendrana
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IMPROVED MALEIC ANHYDRIDE GRAFTING TO LINEAR LOW DENSITY POLYETHYLENE BY MICROENCAPSULATION METHOD Rahayu, Iman; Zainuddin, Achmad; Hendrana, Sunit
Indonesian Journal of Chemistry ARTICLE IN PRESS
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.48785

Abstract

A common graft copolymerization method usually results in a low degree of grafting due to its poor inter-component interactions. A monomer microencapsulation method should be useful to enhance the current graft copolymerization technique. The maleic anhydride (MAH) grafted with linear low-density polyethylene (LLDPE) was successfully synthesized by monomer microencapsulation without using a direct method in order to find a high degree of grafting. The results showed that the degree of grafting of the LLDPE synthesized by microencapsulation (5.9%) was higher than that achieved with the direct method (5.0%).
PENGARUH SUHU DAN TEKANAN PROSES PEMBUATAN TERHADAP KONDUKTIVITAS IONIK MEMBRAN PEMFC BERBASIS POLISTIREN TERSULFONASI. Hendrana, Sunit; Pujiastuti, Sri; Sudirman, Sudirman; Rahayu, Iman; Rustam, Yandhitra H.
Jurnal Sains Materi Indonesia Vol 8, No 3: JUNI 2007
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2007.8.3.4691

Abstract

PENGARUH SUHU DAN TEKANAN PROSES PEMBUATAN TERHADAP KONDUKTIVITAS IONIK MEMBRAN PEMFC BERBASIS POLISTIREN TERSULFONASI. Telah dilakukan pembuatan membran PEMFC berbasis polistiren tersulfonasi (sPS) dengan metode hotpres. Parameter yang divariasikan adalah suhu dan tekanan pada saat pengepresan. Membran yang dihasilkan memberikan hasil yang menunjukkan perubahan karakter membran yang berpengaruh pada sifat konduktivitas ioniknya. Analisis yang digunakan dalam pengkajian kali ini adalah Fourier Transform Infrared (FTIR), analisis kandungan gugus -SO3H, pengukuran konduktivitas ionik, dan Scanning Electron Microscope (SEM). Hasil analisis dari berbagai metode tersebut adalah suhu dan tekanan memberikan efek yang cukup berarti pada kandungan gugus -SO3H akhir dari membran yang dibuat. Analisis data menunjukkan bahwa terdapat korelasi antara rigiditas membran terhadap sifat konduktivitas ioniknya.
APPLICATION OF SULFONATED POLYSTYRENE IN POLYMER ELECTROLYTE FUEL CELL Hendrana, Sunit; Erwin, Erwin; Krisman, Krisman; Syakbaniah, Syakbaniah; Isna?im, Isna?im; Yusmeri, Yusmeri; Satria, Neti; Susilawati, Tri; Sudirman, Sudirman
Jurnal Sains Materi Indonesia Vol 20, No 1: OCTOBER 2018
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2018.20.1.5406

Abstract

APPLICATION OF SULFONATED POLYSTYRENE IN POLYMER ELECTROLYTE FUEL CELL. Sulfonated polystyrene (SPS) is polyelectrolyte solid that widely used in many aplications. In this works SPS is applied for some parts of polymer electrolyte fuel cell membrane due sulfonate group available in the structure. The investigation involve the application for membrane with addition of small molecules, i.e. benzimidazole and evaluating its microstructure and performance. Application of SPS solution as binding agent in MEA will also be presented.  The results show that when using SPS as fuel cell membrane, the additon of small molecules such as benzimidazole would modify its microstrusture as well as improve its ion conductivity. Meanwhile, some improvement still required for application of SPS solution as binding agent for preparation of Membrane Electrode Assembly or MEA.
SIFAT MEMBRAN FUELLCELL BERBASIS POLISTIRENA TERSULFONASI (SPS) DENGAN PENAMBAHAN ADITIF Hendrana, Sunit; Kartini, Rinda; Rahayu, Imam; Sudirman, Sudirman
Jurnal Sains Materi Indonesia Vol 8, No 2: FEBRUARI 2007
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2007.8.2.4803

Abstract

SIFAT MEMBRAN FUELLCELL BERBASIS POLISTIRENA TERSULFONASI (sPS) DENGAN PENAMBAHAN ADITIF. Telah dilakukan pembuatan membran fuelcell berbasis polistiren tersulfonasi (sPS) dengan penambahan aditif asam fosfomolibdat dan benzimidazol. Bahan sPS dibuat dengan metode heterogeneus sulfonation. Pembuatan membran dilakukan dengan cara hotpress. Kandungan masing-masing aditif pada membran tidak mempengaruhi proses kerusakan membran apabila membran diekspose pada suhu yang tinggi. Data pengukuran konduktifitas ionik menunjukkan bahwa penambahan additif memberikan kontribusi yang besar di dalam peningkatan sifat konduktif. Namun setiap aditif mempunyai kontribusi yang berbeda terhadap konduktifitas ionik membran, dimana aditif asam fosfomolibdat mempunyai efek yang lebih besar di dalam peningkatan konduktifitas dibandingkan dengan aditif benzimidazol.
PROSPEK DAN POTENSI MEMBRAN POLIMER UNTUK DESALINASI Hendrana, Sunit; Widuri, Noorika Retno; Sadiyatmo, Momon
Telaah Vol 32, No 1 (2014)
Publisher : Research Center for Physics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/tel.32.1.178

Abstract

Reverse osmosis (RO) dan elektrodialisis merupakan proses desalinasi yang menggunakan membran. RO adalah metode yang paling banyak digunakan untuk proses desalinasi. Perkembangan teknologi membran reverse osmosis telah mencapai maturity pada skala industri. Namun demikian, pengembangan tetap dilakukan untuk mencapai konsumsi energi minimum secara teoritis pada 50% recovery, dengan air laut sebagai sumbernya, sebesar 1.08 kWh m-3. Pengembangan membran dilakukan dengan menentukan jenis polimer yang digunakan serta metode pembuatan membrannya. Penggunaan carbon nanotube (CNT) dalam pembuatan membran untuk desalinasi RO dapat meningkatkan efektifitas membran RO. Peluang pengembangan membran untuk proses desalinasi dapat dilakukan melalui metode sulfonasi pada polimer untuk proses desalinasi dengan metode elektrodialisis.
ANALISIS KROMATOGRAFI PERMEASI GEL DARI KOPOLIMER CANGKOK RADIASI METILMETAKRILAT PADA KARET ALAM Hendrana, Sunit; Utama, Marga; Purwanto, Indratmoko Hari; Herwinami, Herwinami; Karyaningsih, Ipit
Jurnal Sains Materi Indonesia Vol 5, No 2: FEBRUARI 2004
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jusami.2004.5.2.5222

Abstract

ANALISIS KROMATOGRAFI PERMEASI GEL DARI KOPOLIMER CANGKOK RADIASI METILMETAKRILAT PADA KARET ALAM. Pencangkokan monomer metil metakrilat (MMA) pada karet alam dilakukan dengan cara iradiasi dengan menggunakan sinar-? 60Co pada total dosis 5 KGy, dengan laju dosis l KGy/jam. Kromatotagra? penneasi gel (GPC) digunakan untuk menganalisis proses pencangkokan monomer metil metakrilat ( MMA) pada karet alam. Kromatogram, data bobot molekul (BM) dan distribusi bobot molekul (DBM) GPC mengarah pada fakta bahwa reaksi homopolimerisasi MMA serta pencangkokan MMA pada karet alam merupakan reaksi yang dominan. Data tersebut juga menunjukkan bahwa adanya makroradikal karet alam dengan radikal pada ujung rantai berpengaruh pada homopolimer PMMA yang terjadi.
ROLES OF PREPARATION METHOD ON CHARACTERISTICS OF SUPRAMOLECULAR-STRUCTURED POLYMER ELECTROLYTE MEMBRANE FUEL CELL BASED ON SULFONATED POLYSTYRENE Hendrana, Sunit; Septiviani Semboor, Morina; Liamita Natanael, Christi; Rahayu, Iman; Mashadi, Mashadi; Sudirman, Sudirman
Jurnal Sains Materi Indonesia Vol 18, No 4: JULI 2017
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2017.18.4.4130

Abstract

Polymer Electrolyte Membrane Fuel Cell with supramolecular structure based on Sulfonated Polystyrene (S-PS) have been developed in Research Centre for Physics LIPI. In forming the supramolecular structure sulfonate groups in S-PS are aligned with polyethylene-graft-maleic anhydride (PE-g-MA) which carried out by dissolution of the constituent and mixing of both. The alignmentof sulfonate groups in s-PS is carried out in a liquid form.Therefore, in this study, the effect of concentration of the solution of both polymersconstituent to the alignment of the sulfonate groups and the characteristics of the membrane produced is studied. Scanning Electron Microscope (SEM) images show that all membranes prepared are rigid. Differential Scanning Calorimetry (DSC) studied show very significance differences in its crystal sizes. XRD diffraction data also support the previous results. Membrane prepared from very dilute solution having better ion exchange capacity (IEC), water uptake and ionic conductivity. Therefore, the experiments results showing that very low concentration of polymer constituent, clearly, produced better interaction of both, which agree with hyphotesis in this work where supramolecular structure can be formed by mixing two very dilute polymer solutions.
MORPHOLOGY EFFECT ON BEHAVIOUR OF PHOSPHORICACIDIN SUPRAMOLECULAR STRUCTURED POLYMER MEMBRANE FUEL CELL Hendrana, Sunit; Hartanti, Febrina Tri; Rahayu, Iman
Jurnal Sains Materi Indonesia Vol 14, No 4: JULI 2013
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2013.14.4.4380

Abstract

MORPHOLOGY EFFECT ON BEHAVIOUR OF PHOSPHORICACIDIN SUPRAMOLECULAR STRUCTURED POLYMER MEMBRANE FUEL CELL. Study on the effect of morphology on the conductivity of small molecules added polymer membrane for fuel cell has been done. The polymer electrolyte membrane fuel cell was made by constructing of supramolecular interaction between sulfonated polystyrene and polyethylene-graft-maleic anhydride. The small molecules used was benzimidazole and phosphoric acid. The addition of benzimidazole and phosphoric acid, was espected to improve to ionic conductivity. However, in this work it was observed that morphology of the membrane play vital roles in the final properties of the membrane. In other words, beside concentration of phosphoric acid the morphology affects the conductivity of polymer membrane fuel cell.