scholarly journals Desain dan Manufaktur Tabung Gas Komposit Karbon dengan Metode Wet Bladder Compression Moulding

2021 ◽  
Vol 2 (2) ◽  
pp. 6
Author(s):  
Aditya Nugraha ◽  
Gesang Nugroho
Keyword(s):  
Compression Moulding ◽  
Manual Test

Penggunaan material komposit semakin beragam seiring dengan kemajuan teknologi di berbagai bidang. Serat karbon merupakan material komposit yang banyak digunakan karena memiliki sifat mekanik yang baik, tahan korosi, memiliki rasio kekuatan terhadap berat jenis yang tinggi. Salah satu aplikasi penggunaan material komposit serat karbon yang sangat terbuka peluang pengembangannya adalah untuk tabung gas. Penelitian ini akan menyajikan desain, proses manufaktur, dan pengujian tabung gas komposit. Proses desain meliputi desain tabung gas komposit, desain cetakan, dan desain bladder. Tabung gas komposit terbuat dari serat karbon dan matriks resin epoxy sebanyak 6 lapis pada dinding tabung. Proses manufaktur dilakukan dengan metode wet bladder compression moulding yaitu dengan menggunakan dua buah mould dari material fiberglass bagian atas dan bawah, dan dengan menggunakan bladder atau kantung bertekanan dari latex untuk menekan material komposit. Uji hidrostatis dilakukan menggunakan manual test pump untuk menguji kekuatan tabung. Hasil pengujian menunjukkan tabung gas komposit serat karbon dapat menahan tekanan hidrostatis  hingga 18 bar.

Effect of Cobalt Stearate and Vegetable Oil on Uv and Biodegradation of Linear Low-Density Poly(Ethylene)-Poly(Vinyl Alcohol) Blends

2011 ◽  
Vol 2 (4) ◽  
pp. 131-148 ◽  
Author(s):  
Francis Vidya ◽  
Subin S. Raghul ◽  
Sarita G Bhat ◽  
Eby Thomas Thachil
Keyword(s):  
Vegetable Oil ◽  
Vinyl Alcohol ◽  
Water Soluble ◽  
Poly Vinyl Alcohol ◽  
Low Density ◽  
Compression Moulding ◽  
Melt Mixing ◽  
Degradation Behaviour ◽  
Moulding Process ◽  
Poly Ethylene

The main objective of this study was to enhance the rate of UV and biodegradation of polyethylene by incorporating biodegradable materials and prooxidants. Prooxidants such as transition metal complexes are capable of initiating photooxidation and polymer chain cleavage, rendering the product more susceptible to biodegradation. In this work, the effect of (1) a metallic photoinitiator, cobalt stearate, and (2) different combinations of cobalt stearate and vegetable oil on the photooxidative degradation of linear low-density poly(ethylene)-poly(vinyl alcohol) (LLDPE/PVA) blend films has been investigated. For this, film-grade LLDPE was blended with different proportions of PVA. PVA is widely used in the industrial field, and recently it has attracted increasing attention as a water-soluble biodegradable polymer. Cobalt stearate and vegetable oil were added to the blends as prooxidants. The blends were prepared by melt mixing in a Thermo HAAKE Polylab system. Thin films containing these additives were prepared by a subsequent compression moulding process. The effect of UV exposure on LLDPE/PVA films in the presence as well as absence of these additives was investigated. Tensile properties, FTIR spectra, and scanning electron microscopy (SEM) were employed to investigate the degradation behaviour. It was found

scholarly journals Functional Properties and Molecular Degradation of Schizostachyum Brachycladum Bamboo Cellulose Nanofibre in PLA-Chitosan Bionanocomposites

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 2008
Author(s):  
Samsul Rizal ◽  
N. I. Saharudin ◽  
N. G. Olaiya ◽  
H. P. S. Abdul Khalil ◽  
M. K. Mohamad Haafiz ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Moisture Content ◽  
Polymeric Materials ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Thickness Swelling ◽  
Compression Moulding ◽  
Ft Ir ◽  
Degradation Properties

The degradation and mechanical properties of potential polymeric materials used for green manufacturing are significant determinants. In this study, cellulose nanofibre was prepared from Schizostachyum brachycladum bamboo and used as reinforcement in the PLA/chitosan matrix using melt extrusion and compression moulding method. The cellulose nanofibre(CNF) was isolated using supercritical carbon dioxide and high-pressure homogenisation. The isolated CNF was characterised with transmission electron microscopy (TEM), FT-IR, zeta potential and particle size analysis. The mechanical, physical, and degradation properties of the resulting biocomposite were studied with moisture content, density, thickness swelling, tensile, flexural, scanning electron microscopy, thermogravimetry, and biodegradability analysis. The TEM, FT-IR, and particle size results showed successful isolation of cellulose nanofibre using this method. The result showed that the physical, mechanical, and degradation properties of PLA/chitosan/CNF biocomposite were significantly enhanced with cellulose nanofibre. The density, thickness swelling, and moisture content increased with the addition of CNF. Also, tensile strength and modulus; flexural strength and modulus increased; while the elongation reduced. The carbon residue from the thermal degradation and the glass transition temperature of the PLA/chitosan/CNF biocomposite was observed to increase with the addition of CNF. The result showed that the biocomposite has potential for green and sustainable industrial application.

The effects of adding carbon nanotubes to the mechanical and tribological properties of a carbon fibre reinforced polyether ether ketone composite

2009 ◽  
Vol 223 (11) ◽  
pp. 2501-2507 ◽  
Author(s):  
J Li ◽  
L Q Zhang
Keyword(s):  
Carbon Nanotubes ◽  
Wear Resistance ◽  
Carbon Fibre ◽  
Vinyl Ester ◽  
High Wear Resistance ◽  
Compression Moulding ◽  
Mechanical And Tribological Properties ◽  
Polyether Ether Ketone ◽  
Carbon Nano Tubes ◽  
Ether Ketone

The main objective of this article is to develop a high wear resistance carbon fibre (CF)-reinforced polyether ether ketone composite with the addition of multi-wall carbon nano-tubes (MWCNT). These compounds were well mixed in a Haake batch mixer and compounded polymers were fabricated into sheets of known thickness by compression moulding. Samples were tested for wear resistance with respect to different concentrations of fillers. Wear resistance of a composite with 20 wt% of CF increases when MWCNT was introduced. The worn surface features have been examined using a scanning electron microscope (SEM). Photomicrographs of the worn surfaces revealed higher wear resistance with the addition of carbon nanotubes. Also better interfacial adhesion between carbon and vinyl ester in a carbon-reinforced vinyl ester composite was observed.

Prioritizing manual test cases in rapid release environments

2016 ◽  
Vol 27 (6) ◽  
pp. e1609 ◽  
Author(s):  
Hadi Hemmati ◽  
Zhihan Fang ◽  
Mika V. Mäntylä ◽  
Bram Adams
Keyword(s):  
Test Cases ◽  
Rapid Release ◽  
Manual Test

Compression Moulding of Rubber Powder from Exhausted Tyres

2012 ◽  
Vol 51 (4) ◽  
pp. 340-344 ◽  
Author(s):  
Carmine Lucignano ◽  
Alessandro Gugliemotti ◽  
Fabrizio Quadrini
Keyword(s):  
Compression Moulding ◽  
Rubber Powder

scholarly journals A new, Modern, COST-Saving micro/macro method for the determination of serum fructosamine

2000 ◽  
Vol 48 (3) ◽  
pp. 285-291 ◽  
Author(s):  
Klára Oppel ◽  
L. Bárdos ◽  
A. Ferencz ◽  
Hajnalka Lakner ◽  
Judit Simon ◽  
...  
Keyword(s):  
Diabetic Control ◽  
Test Tube ◽  
Farm Animals ◽  
Human Blood Plasma ◽  
Plasma Samples ◽  
Time Saving ◽  
Serum Fructosamine ◽  
One Year ◽  
Manual Test

Serum/plasma fructosamine (SeFa) concentration is a reliable indicator used in human diabetic control. Tests for monitoring the carbohydrate/energy metabolism of (farm) animals are less commonly performed in veterinary laboratories, since most of the reliable determinations, both automated and manual, are relatively expensive. The aim of this study was to develop a precise, money- (and time-) saving automated micro method for measuring SeFa. ELISA microplates (20 µL samples and 200 µL reagents) and an automatic microplate autoreader were used. The classical nitroblue tetrazolium (NBT) stain reagent solution of Johnson et al. (1982) was modified using a SIGMA reagent to render it stable for up to one year. SeFa concentrations measured by the new method in 30 human blood plasma samples were compared with values obtained by the standard (generally used) LaRoche kit procedure. Fifteen cow, 13 dog and 18 chicken plasma samples were assayed by the new automated ‘micro’ method as well as by the manual test tube ‘macro’ method commonly used earlier. The modified reagent was applied for both methods. The coefficient of correlation (r) between the results obtained by the two methods was consistently between 0.94 and 0.98 (p < 0.001).

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