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Jurnal Teknik Kimia USU
Published by Universitas Sumatera Utara
ISSN : -     EISSN : -     DOI : -
Core Subject : Science, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering
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Articles 349 Documents
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EFFECT OF EPOXIDIZED NATURAL RUBBER AS A COMPATIBILIZER IN SILICA-FILLED STYRENE BUTADIENE RUBBER COMPOUND Indra Surya, Siswarni MZ
Jurnal Teknik Kimia USU Vol 3, No 2 (2014)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (166.05 KB) | DOI: 10.32734/jutek.v3i2.7201

Abstract

By using a semi-efficient vulcanization system, the effect of Epoxidized Natural Rubber (ENR) as a compatibilizer in silica-filled Styrene Butadiene Rubber (SBR) compound was carried out. The ENR was incorporated into the silica-filled SBR compound at 5.0 and 10.0 phr. An investigation was carried out to examine the effect of ENR on cure characteristics and tensile properties of the silica-filled SBR compound. It was found that ENR gave enhanced cure rate to the silica-filled SBR compound. ENR also exhibited a higher torque difference, tensile modulus, and tensile strength up to 10.0 phr. The study of rubber - filler interaction proved that the addition of ENR to the silica-filled SBR system improved the rubber - filler interaction.
EKSTRAKSI PIGMEN ANTOSIANIN DARI KULIT RAMBUTAN (NEPHELIUM LAPPACEUM) DENGAN PELARUT METANOL Elvi Rasida Florentina Hutapea, Laura Olivia Siahaan, Rondang Tambun
Jurnal Teknik Kimia USU Vol 3, No 2 (2014)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (339.292 KB) | DOI: 10.32734/jutek.v3i2.7314

Abstract

Rambutan fruit (Nephelium lappaceum) is a kind of tropical fruits which come from Malaysia and Indonesia. Their red coloured rinds have not used yet effectively and the red coloured may be due to anthocyanin that can be used for natural colours. The purpose of this research is to know the optimal conditions of the extraction of anthocyanin, they are particle size of rambutan rind, temperature and extraction time. Analysis of the anthocyanin use spectrophotometer UV-Vis to detect the wavelength and the absorbance of the anthocyanin. The best conditions are rambutan rind milled by blender at temperature 50 0C and extraction time for 6 hours. These conditions give the highest color intensity having 1,6103 of maximal absorbancy, 55,7659 mg/mL of anthocyanin concentration and 0,2788% of rendement.
EKSTRAKSI PIGMEN ANTOSIANIN DARI KULIT RAMBUTAN (NEPHELIUM LAPPACEUM) DENGAN PELARUT ETANOL Laura Olivia Siahaan, Elvi Rasida Florentina Hutapea, Rondang Tambun
Jurnal Teknik Kimia USU Vol 3, No 3 (2014)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (307.094 KB) | DOI: 10.32734/jutek.v3i3.7315

Abstract

Rambutan fruit (Nephelium lappaceum Linn) is a kind of tropical fruits which come from Malaysia and Indonesia. Their red coloured rinds have not used yet effectively and that coloured may be due to anthocyanin that can be used for natural colours. The purpose of this research is to know the optimal condition of the extraction anthocyanin, they are particle size of rambutan rinds, temperature and extraction time. Analysis of the anthocyanin use spectrophotometer UV-Vis to detect the wavelength and the absorbance of the anthocyanin. The best conditions are rambutan rind milled by blender and extraction time for 8 hours at 70 0 of temperature. These conditions give the highest color intensity having 1,0086 of maximal absorbancy, 120,1601 mg/mL of anthocyanin concentration  and 0,6008 % of rendement.   
KARAKTERISASI POLIMER KONDUKTIF POLIPIROL BERPENGISI SERBUK BAN UNTUK MENDETEKSI KONDUKTIVITAS MINYAK Satriaji Sudigdo, Rizky Dharmawan, Hamidah Harahap
Jurnal Teknik Kimia USU Vol 3, No 2 (2014)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (130.885 KB) | DOI: 10.32734/jutek.v3i2.7317

Abstract

Conductive polymer sensor based polypyrrole (ppy) and tire dust and 1,4-methyl-pyrrolidinone was made by using polymerization process. The polymerization process was prepared at temperature 100°C in boiling water for 30 minutes. Conductive polymer sensor is undergone several type of analysis including electrical conductivity, Scanning Electron Microscopy (SEM), Fourier Transform Infrared (FTIR),and X-Ray Diffraction (XRD). The test used some kind of oil (palm oil,corn oil, diesel, and engine oil). The conductivity test result shows that sensor-4 (contain 20 phr of tire dust) in 80°C at 30 minutes had the highest conductivity. Scanning Electron Microscopy result shows the rough surface and well dispersed of tire dust in polypyrrole/tire dust blends. The XRD analysis shows the Face Centered Cubic (FCC) crystallographic structure of the sensor. The oil conductivity test shows that the corn oil is more reactive than others.
KARAKTERISASI SENSOR POLIMER KONDUKTIF POLIANILIN BERPENGISI SERBUK BAN UNTUK MENDETEKSI KONDUKTIVITAS MINYAK Rizky Dharmawan, Satriaji Sudigdo, Hamidah Harahap
Jurnal Teknik Kimia USU Vol 3, No 2 (2014)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (131.696 KB) | DOI: 10.32734/jutek.v3i2.7318

Abstract

Conductive polymer sensor with varying amounts of poly aniline and tire dust and 1.4-methyl-pyrrolidinone as solvent using polymerization process have been developed. The polymerization process was prepared at temperature 100o C in the boiling water at 30 minutes. Conductive polymer sensor¬ is undergone several type of the analysis including electrical conductivity, Scanning Electron Microscope, Fourier Transform Infra-Red (FTIR), X-Ray Diffraction (XRD). The test used some kind of oil (palm oil, corn oil, diesel oil, and engine oil). The result showed that the highest electrical conductivity for the sensor-4 (20 per hundred resin of the tire dust) at 80oC for 30 minutes. Scanning electron microscope result shows rough surface and well dispersed of the tire dust in poly aniline / tire dust conductive blends. The analysis of X-RD shows the face center cubic (FCC) crystallographic structure of the sensor. The optimum of the electrical conductivity of the sensor was applied to detect the palm oil. The sensor given response towards palm oil (Neptune) compered to corn oil, diesel oil, and engine oil.
PENGARUH UKURAN PARTIKEL DAN KOMPOSISI TERHADAP SIFAT KEKUATAN BENTUR KOMPOSIT EPOKSI BERPENGISI SERAT DAUN NANAS Syahrinal Anggi Daulay, Fachry Wirathama, Halimatuddahliana
Jurnal Teknik Kimia USU Vol 3, No 3 (2014)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (462.527 KB) | DOI: 10.32734/jutek.v3i3.7350

Abstract

This research was aimed to investigate the effect of pineapple leafs particle size and pineapple leaf fiber composition of the impact strength of epoxy composites filled with pineapple leaf fibers. The composites were made by hand lay up method by mixing epoxy and pineapple leaf fiber with particle size variation of 30 mesh, 40 mesh, 70 mesh, 100 mesh, and volume fraction ratio between filler and matrix 5/95, 10/90, 15/85 (v/v). Mechanical properties wich tested was impact strength and  supported with SEM analysis. The results obtained show that the addition pineapple leaf fiber as filler in epoxy composites generally increase the impact strength of the composites, with best performance shown by 100 mesh particle size variation with ratio 90/10 (v/v) which from SEM analysis show that this variation having better filler distribution.
JTK USU Journal Management
Jurnal Teknik Kimia USU Vol 3, No 3 (2014)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (6.381 KB) | DOI: 10.32734/jutek.v3i3.7803

Abstract

JTK USU
STUDI SOLIDIFIKASI POLIETERSULFON DALAM PELARUT N-METIL-2-PIRROLIDON DENGAN ADITIV POLYVINYL PYRROLIDONE DAN 2-(METHACRYLOYLOXY) ETHYL PHOSPHORYL CHLOLINE Nasrul Arahman, Sri Aprilia, Teuku Maimun
Jurnal Teknik Kimia USU Vol 3, No 3 (2014)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (207.558 KB) | DOI: 10.32734/jutek.v3i3.7806

Abstract

In membrane preparation process via phase inversion method, the morphology of fabricated membranes are determined by composition and concentration of polymer, solvent, and non-solvent. The basic knowledge of the appropriate composition of those components are needed by cloud point experiment. In this work, the study on cloud point experiment have been done to investigate the solidification process of polymer system of polyethersulfone (PES) and 2-(methacryloyloxy) ethyl phosphoryl chloline (MPC) in N-methyl-2-pirrolidon (NMP) via phase inversion technique. Hydrofilik polymer MPC were used as a membrane modifying agent (MMA) in order to modify the surface property of fabricated membrane. In sum, addition of PVP and MPC into polymer solution brought about reducing amount of non-solvent necessary  to obtain the cloud point of solution.
PENGARUH RASIO EPOKSI/AMPAS TEBU DAN PERLAKUAN ALKALI PADA AMPAS TEBU TERHADAP KEKUATAN BENTUR KOMPOSIT PARTIKEL EPOKSI BERPENGISI SERAT AMPAS TEBU Akhmad Nadji Shabiri, Rizky Salaam Ritonga, M. Hendra S. Ginting
Jurnal Teknik Kimia USU Vol 3, No 3 (2014)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (216.062 KB) | DOI: 10.32734/jutek.v3i3.7932

Abstract

This study was aimed to determine the effect of alkali treatment and fiber composition on the impact strength properties of epoxy composites filled with bagasse fiber. Composites are made by hand lay-up method by mixing epoxy and bagasse fiber with variation of volume ratio between matrix and filler are 100/0, 70/30, 60/40, and 50/50 (v / v) and the concentration of NaOH slolution in the alkali treatment are 0% , 1%, 2%, and 3%. Mechanical propertie tested was impact strengthand analized  by SEM analysis. The results obtained from this study was the maximum impact strength value obtained of the composite was on the composition 70:30 with 2% NaOH concentration was 8,005 kJ/m2.
PENGARUH PENAMBAHAN AMMONIUM SULFAT (NH4)2SO4 DAN WAKTU PERENDAMAN BUFFER FOSFAT TERHADAP PEROLEHAN CRUDE PAPAIN DARI DAUN PEPAYA (CARICA PAPAYA, L) Mitha Alviyulita, Pinta Rizki Mala Hasibuan, Farida Hanum
Jurnal Teknik Kimia USU Vol 3, No 3 (2014)
Publisher : Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (241.159 KB) | DOI: 10.32734/jutek.v3i3.8133

Abstract

Papaya leaves is a plant that rich in benefits. Papaya leaves contains papain enzyme which is a protease enzyme that very helpful for the industry. This study aims to determine the effect of the saturation level of ammonium sulphate (NH4)2SO4 and immersion time with phosphate buffer to get yield of protease from crude papaya. In this study varied immersion time with phosphate buffer is 0, 12, 24, and 36 hours and the saturation level of ammonium sulphate (NH4)2SO4 is 40, 50, 60, 70, 80, and 90 %. Analysis of protease activity was performed using UV spectrophotometer to measure the wavelength and absorbance values​​. The highest value of the protease activation (132,98% unit/ml) was obtained during 36 h of immersion time in phosphate buffer with 60% concentration of ammonium sulphate (NH4)2SO4. The results found on 36 h of immersion time in  90% of ammonium sulphate concentration were the highest for rendement and water content value of 37,62 and 65,70%, respectively.

Page 8 of 35 | Total Record : 349

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