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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Elastomers and Composites
Journal Basic Information
Journal DOI :
The Rubber Society of Korea
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Volume & Issues
Volume 45, Issue 4 - Dec 2010
Volume 45, Issue 3 - Sep 2010
Volume 45, Issue 2 - Jun 2010
Volume 45, Issue 1 - Mar 2010
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Effects of Sizing Treatment of Carbon Fibers on Mechanical Interfacial Properties of Nylon 6 Matrix Composites
Park, Soo-Jin ; Choi, Woong-Ki ; Kim, Byung-Joo ; Min, Byung-Gak ; Bae, Kyong-Min ;
Elastomers and Composites, volume 45, issue 1, 2010, Pages 2~6
The sizing treatments of PAN-based carbon fiber surfaces were carried out in order to improve the interfacial adhesion in the carbon fibers/nylon6 composite system. The parameter to characterize the wetting performance and surface free energy of the sized fibers were determined by a contact angle method. The mechanical interfacial properties of the composites were investigated using critical stress intensity factor (
). The cross-section morphologies of sized CFs/nylon6composites were observed by SEM. As the experimental results, it was observed that silane-based sizing treated carbon fibers showed higher surface free energies than other sizing treatments. In particular, the KIC of the sizing-treated carbon fibers reinforced composites showed higher values than those of untreated carbon fibers-reinforced composites. This result indicated that the increase in the surface free energy of the fibers leads to the improvement of the mechanical interfacial properties of carbon fibers/nylon6 composites.
Production of Acetylene Black/silica Composite Particles by Adsorption of Polyethylenimine
Lee, Jeong-Woo ; Park, Jung-Hwan ; Shim, Sang-Eun ;
Elastomers and Composites, volume 45, issue 1, 2010, Pages 7~11
The acetylene black/silica composite particles were prepared by a simple and fast method using polyethylenimine (PEI) as a coupling agent. The composite particles were produced via the following two steps; adsorption of PEI on the surface of acetylene black particles and synthesis of silica by sol-gel process. The morphology of the composite particles was a core-shell, and a large number of micropores was created after silica was synthesized on the acetylene black surface.
Influence of Hydrophobic Silica on Physical Properties of Epoxy Nanocomposites for Epoxy Molding Compounds
Kim, Ki-Seok ; Oh, Sang-Yeob ; Kim, Eun-Sung ; Shin, Hun-Choong ; Park, Soo-Jin ;
Elastomers and Composites, volume 45, issue 1, 2010, Pages 12~16
In this work, the effect of hydrophobic treated silica on the water absorption, thermal stabilities, and mechanical properties of the epoxy nanocomposites were investigated as a function of the silica content. As filler, fumed silica treated by dimethyldichlorosilane was used. It was found that the silica was well dispersed in the epoxy resins by the melt-mixing method with the addition of a silane coupling agent. The water absorption of the nanocomposites decreased with an increase of the silica content due to the effect of hydrophobic treated silica. The thermal properties, such as thermal degradation temperature, glass transition temperature (
), and coefficient of thermal expansion (CTE), of the nanocomposites were improved by the addition of silica. Furthermore, the mechanical properties of the nanocomposites, that is, the tensile strength and modulus, were enhanced with increasing silica content. This was attributed to the physically strong interaction between silica and epoxy resins.
Thermal and Electrical Properties of PS/MWCNT Composite Prepared by Solution Mixing: Effect of Surface Modification of MWCNT
Park, Eun-Ju ; Lee, Jeong-Woo ; Jung, Dong-Soo ; Shim, Sang-Eun ;
Elastomers and Composites, volume 45, issue 1, 2010, Pages 17~24
Herein, the effect of the dispersion uniformity of the multi-wall carbon nanotube (MWCNT) on the thermal and electrical conductivity of polystyrene (PS)/MWCNT composite was investigated. The PS/MWCNT composites were prepared by solution mixing from dispersions of various MWCNTs in PS/tetrahydrofuran (THF) solution. Three types of MWCNTs were used; pristine MWCNT, hydroxyl functionalized MWCNT, which was functionalized with
in the presence of a phase transfer catalyst at room temperature, and pristine MWCNT with BYK-9077 as a dispersant. It was found that the stable dispersion state of MWCNT in PS/THF solutions significantly improved the thermal and electrical conductivity of the ultimate composites. It is noted that the thermal and electrical conductivity of PS/3 wt% pristine MWCNT composite with BYK-9077 were about 9.4 and 30~50% higher than those of PS/3 wt% pristine MWCNT composite, respectively.
Preparation of Carbon-
Composites by Using Different Carbon Sources with Titanium n-Butoxide and Their Photocatalytic Activity
Chen, Ming-Liang ; Zhang, Feng-Jun ; Zhang, Kan ; Meng, Ze-Da ; Oh, Won-Chun ;
Elastomers and Composites, volume 45, issue 1, 2010, Pages 25~31
We used activated carbon (AC), activated carbon fiber (ACF) and multi-walled carbon nanotube (MWCNT) as carbon sources and titanium n-butoxide as titanium source to prepare carbon-
composites. For characterization their properties, scanning electron microscopy (SEM), transmission electron microscopy (TEM), BET surface area, X-ray diffraction (XRD) and energy dispersive X-ray analysis (EDX) were used. And the photoactivity of the carbon-
composites, under UV irradiation, was tested using the fixed concentration of methylene blue (MB,
) in aqueous solution. After UV irradiation for a certain time, the concentration of MB solution was determined by UV-vis absorption spectroscopy.
Study on the Oil Seal Application Using Polytetrafluoroethylene Composites
Ha, Ki-Ryong ; Lee, Jong-Cheol ; Lee, Young-Seok ;
Elastomers and Composites, volume 45, issue 1, 2010, Pages 32~39
The mechanical properties of PTFE 100%, PTFT 90% + carbon black 10%, PTFE 85% + glass fiber 15%, PTFE 80% + glass fiber 15% + molybdenum disulfide (
) 5%, PTFE 75% + glass fiber 25%, and PTFE 75% + carbon black 18% + graphite 7% composites were investigated in this study. The differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to examine the heat of fusion(
) and thermal stability of the composites. Also, the wear surface and wear volume of PTFE lip seal were examined using the durability test. Wear surface was observed using scanning electron microscope (SEM). It was found that the hardness, wear resistance and durability were enhanced by adding glass fiber and molybdenum disulfide into pure PTFE, but tensile strength and elongation were decreased. According to the experimental results, the composite (PTFE + 15% glass fiber + 5% molybdenum disulfide) showed the best properties for applying to oil-seal among six types of PTFE composites.
Effect of Fiber Orientation on Ionic Conductivity of Electrospun Polyimide Nanofibers Mats
Huh, Yang-Il ; Kim, Young-Hee ; Ahn, Jou-Hyeon ; Lee, Hong-Ki ; Nah, Chang-Woon ;
Elastomers and Composites, volume 45, issue 1, 2010, Pages 40~43
In this study, polyimide(PI) nanofibers mats were prepared by electrospinning and three different fiber morphologies of random, uniaxial, and biaxial orientation were prepared by controlling the speed of drum-shaped collector and other parameters. The SEM studies reveal that the aforesaid morphologies were obtained on the nano-fibrous mats prepared. The ionic conductivity was measured using an in-plane type conductivity tester for the PI mats soaked in the mixture of 1M lithium trifluoro-methane-sulfonate and tetra-ethylene glycol dimethyl ether. The ionic conductivity was surprisingly higher for the biaxial PI mats. For the uniaxially-oriented mats, the ionic conductivity was found to be higher in the parallel direction compared to the perpendicular direction of the fiber orientation. A curious cyclic fluctuation was found in the ionic conductivity with time. The observed behavior was explained by considering the distance between fibers and transport speed of ions used in this study.
Effects of Environmental Factors such as Temperature and Ozone Concentration on the Properties of BR/Crystalline Rubber Blend
Park, Chan-Young ; Lee, Won-Kee ; Min, Seong-Kee ;
Elastomers and Composites, volume 45, issue 1, 2010, Pages 44~50
The butadiene rubber(BR) blends with chloroprene rubber(CR) were prepared by mechanical mixing method. Cure characteristics, mechanical properties, ozone resistance properties and dynamic mechanical properties were subsequently examined. The properties of ozone resistance of pure BR was significantly improved through blending with 50 wt% CR. Dynamic characteristics determined from a Rheovibron generally showed two glass transition(
) for the entire blends,
peak monotonically shifted toward the higher temperature with the increasing content of CR. Optimum cure time of compound was significantly lengthened with loading of CR.
Preparation and Characterization of Cellulose Nano-Whiskers Extracted from Microcrystalline Cellulose by Acid Hydrolysis
Jeong, Hae-Deuk ; Yoon, Chang-Rok ; Lee, Jong-Hyeok ; Bang, Dae-Suk ;
Elastomers and Composites, volume 45, issue 1, 2010, Pages 51~57
Cellulose nanowhiskers (CNW) gamered increasing interest for their remarkable reinforcement of polymer composites. In this work, we were to produce cellulose whiskers from commercially available microcrystalline cellulose (MCC) by acid hydrolysis with sulfuric and hydrochloric acids. Electron microscopy found that each acid produced sililar cellulose crystals of diameters ranging from 20 to 30 nm and lengths ranging from 200 to 300 nm. Moreover, all samples showed remarkable flow birefringence through crossed polarization filters. Conductometric titration of CNW suspensions revealed that the sulfuric acid treated sample had a surface charge of between 140.00 mmol/kg and 197.78 mmol/kg due to sulfate groups, while that of the hydrochloric acid treated sample was undetectable. Thermogravimetric analysis showed that the thermal decomposition temperature and apparent activation energy (evaluated by Broido's method at different stages of thermal decomposition.) of H1-CNW - prepared by hydrolysis with hydrochloric acid - was higher than those of S1-CNW and S2-CNW - prepared by hydrolyzing MCC with sulfuric acid.