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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 47, Issue 4 - Dec 2012
Volume 47, Issue 3 - Sep 2012
Volume 47, Issue 2 - Jun 2012
Volume 47, Issue 1 - Mar 2012
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Preparation and Property of Flexible/Stretchable Electrodes
Lee, Gi-Bbeum ; Nah, Changwoon ;
Elastomers and Composites, volume 47, issue 4, 2012, Pages 272~281
DOI : 10.7473/EC.2012.47.4.272
Flexible/stretchable electronics have recently focused, since their applications extend to emerging flexible displays, sensors, dielectric elastomer actuator and generators, and smart surgical tools. Flexible/stretchable electrodes should be synchronized with employing mechanical deformations of either flexing or stretching modes. Thus, the research area is one of the tough subjects, since the electrodes should keep their basic functions of electrodes under various mode of mechanical deformations. In this review, we discuss the recent development in the preparation and properties of such flexible/stretchable electrodes.
Photo-responsive Smart Polymer Materials
Yu, Jong-Su ; Lee, Seong-Yun ; Na, Hee-Yeong ; Ahn, Tae-Jung ; Kim, Hyun-Kyoung ;
Elastomers and Composites, volume 47, issue 4, 2012, Pages 282~291
DOI : 10.7473/EC.2012.47.4.282
Control of shape/volume, mechanical, optical, electrical, and chemical switching of materials by external stimuli such as light, temperature, pH, electric field, and pressure has attracted great attention. Among these materials, photo-responsive materials containing photochromic compounds such as azobenzene, spiropyran, and cinnamic acid groups have been the subject of intense interest in recent years. In this review, we describe the recent progress in the area of azobenzene containing polymer materials that can convert light energy into mechanical energy directly. Especially we focus our attention on light-driven actuators such as artificial muscle, motor, and valve. We summarize the photomechanical effects in liquid crystal elastomer, amorphous polymer, monolayer, and supramolecules containing azobenzene, respectively.
Electrochemical Properties of Activated Carbon Capacitor Adopting a Proton-conducting Hydrogel Polymer Electrolyte
Latifatu, Mohammed ; Kim, Kwang Man ; Kim, Yong Joo ; Ko, Jang Myoun ;
Elastomers and Composites, volume 47, issue 4, 2012, Pages 292~296
DOI : 10.7473/EC.2012.47.4.292
An electric double-layer capacitor (ELDC) of activated carbon electrode is prepared using a proton-conducting hydrogel polymer electrolyte, which is composed of poly(vinyl alcohol), silicotungstic acid,
, and deionized water. A solid film by evaporating the hydrogel polymer electrolyte is also prepared for comparison. The hydrogel polymer electrolyte also acts as a separator with the thickness of about
and the room-temperature ionic conductivity of
. The EDLC containing the symmetric electrodes of activated carbon shows the specific capacitance of
with a good cycle life, implying that the hydrogel polymer electrolyte is very promising for use in EDLCs.
Foaming Behavior, Structure, and Properties of Rubber Nanocomposites Foams Reinforced with Zinc Methacrylate
Basuli, U. ; Lee, G.B. ; Jang, S.Y. ; Oh, J. ; Lee, J.H. ; Kim, S.C. ; Jeon, N.D. ; Huh, Y.I. ; Nah, C. ;
Elastomers and Composites, volume 47, issue 4, 2012, Pages 297~309
DOI : 10.7473/EC.2012.47.4.297
Different amounts of foaming agents were employed in natural rubber(NR)/butadiene rubber(BR) blends to understand the foaming behavior in presence of nano-reinforcing agent, zinc methacrylate (ZMA). The ZMA greatly improved most of the mechanical properties of the rubber foams, however it did not show considerable effect on the cell morphology, such as cell size, density and porosity. It was also observed that the foaming agent concentration affected all the mechanical parameters. When the content of foaming agent was increased, the number of foams was increased leading to a decrease in density of the compounds. But the size and distribution of foams remained unchanged with increased foaming agent. The effect of high styrene-butadiene rubber (HSBR) was also studied. The size of cells became smaller and the cell uniformity was improved with increasing HSBR. The foam rubber compounds showed much efficient energy absorbing capability at higher strains.
Effects of Plasma Treatment on Mechanical Properties of Jute Fibers and Their Composites with Polypropylene
Huh, Yang Il ; Bismark, Mensah ; Kim, Sungjin ; Lee, Hong Ki ; Nah, Changwoon ;
Elastomers and Composites, volume 47, issue 4, 2012, Pages 310~317
DOI : 10.7473/EC.2012.47.4.310
A jute fiber surface was modified with argon gas in a cylinder type RF plasma generator to enhance the interfacial bond strength and to optimize the plasma treatment condition. The plasma power, gas pressure, and treat time were varied to figure out any effect of those parameters on the morphology and mechanical strength of jute fibers, and the interfacial bond strength for a model composite with polypropylene resin. As the severity of plasma treatment was increased, the surface of jute fibers became rougher. Gas pressure was less effective in roughening of the surface compared with those of treat time and plasma power. Approximately 25% drop in tensile strength of jute fibers was observed for the parameters of treat time and plasma power, while little deterioration was found for gas pressure, with increasing the severity. Based on the interfacial shear strength (IFSS), the optimum plasma treatment condition was determined to be treat time of 30 s, plasma power of 40 W, and gas pressure of 30 mTorr.
Study on Thermal and Physical Properties of One-component Curable Hybrid Polyurethane Elastomer
Mok, Dong Youb ; Kim, In-Soo ; Kim, Dong Ho ; Kim, Gu Ni ;
Elastomers and Composites, volume 47, issue 4, 2012, Pages 318~328
DOI : 10.7473/EC.2012.47.4.318
In this study, the one-component curable polyurethane resin was manufactured using blocked isocyanate and hybrid technology. To prepare the one-component curable hybrid polyurethane, silica hybrids including hydroxyl group was synthesized, and the size, shape and distribution of hybrid particle in polyurethane resin were confirmed. Then the dissociation property, mechanical property and molding property of blocked isocyanate were investigated. The dissociation property of blocked isocyanate in one-component curable polyurethane became better as the heating temperature and treatment time increased. The synthesized silica hybrid had spherical appearance and size of 23~27 nm in diameter, and it was observed that the hybrid particles were homogeneously distributed in polyurethane structure. In the case of hybrid polyurethane, the mechanical property, anti-abrasion and thermal property were higher than those of general polyurethane, and it was observed that the mechanical property was maintained when the plasticizer was introduced.
Effects of the Chain Length of High α-olefins on the Terpolymerization
Kim, Tae-Wan ; Lee, Jun Chul ; Park, No-Hyung ; Kim, Hyun Ki ; Cho, Ur-Ryong ; Kim, Dong Hyun ;
Elastomers and Composites, volume 47, issue 4, 2012, Pages 329~335
DOI : 10.7473/EC.2012.47.4.329
In this study, we synthesized poly(ethylene-ter-high
-olefin-ter-p-methylstyrene) using Zr metallocene catalyst/borate type cocatalyst system. Various effects of the high
-olefin (1-hexene, 1-octene, 1-decene, and 1-dodecene) were observed. The structure and composition of the terpolymers were characterized using
NMR. Catalytic activity, polymer yield, molecular weight and molecular weight distribution were analyzed according to the chain length of high
-olefin. We determined morphology, crystallinity and thermal properties of the terpolymers.
A Study on the Stress Measurement in a Plastic Product using Chemical Cracking Method
Won, S.T. ; Kim, T.B. ; Lee, S. ; Won, J.M. ; Cha, K.H. ; Lyu, M.Y. ;
Elastomers and Composites, volume 47, issue 4, 2012, Pages 336~340
DOI : 10.7473/EC.2012.47.4.336
Residual stress in the injection molded part is originated from thermal shrinkage and shear stress during injection molding process. There are many measurement methods of residual stress in the plastic part. Residual stress in opaque products can be measured by chemical cracking test. This method enables the solvent and specimen to react and to cause cracks. Cracks developed according to the level of residual stress. Thus the stresses in plastic part can be quantitatively measured by counting the number of cracks or measuring the size of cracks. Relationship between stress and number of cracks in a plastic specimen has been investigated in this study. Bergen jig was used to give a strain in the specimens those were molded using PC/PBT and PC/ABS. Solvent for the chemical cracking test was prepared using tetrahydrofuran and methyl alcol with the ratio of 1 to 3. Stresses in the specimen can be calculated by strains those were imposed by Bergen jig. Cracks were developed for stress higher than certain level. The number of cracks increased by second order function for stress.
A Study on the Molding Characteristics of Injection Compression Molding Through Computer Simulation
Chun, Y.H. ; An, H.G. ; Lyu, M.Y. ;
Elastomers and Composites, volume 47, issue 4, 2012, Pages 341~346
DOI : 10.7473/EC.2012.47.4.341
Injection molding is one of the widely used polymer processing operations. It is being used for not only conventional injection molding but gas injection molding, water injection molding, and injection compression molding. Injection compression molding involves injection and compression operation, and it gives uniform physical property and high dimensional quality of product. In this study, injection compression characteristics for various product shapes have been investigated by computer simulation. Product containing side wall showed not much effective in injection compression molding since wall thickness direction was perpendicular to the compression direction. Uniform and low shrinkage was observed in injection compression molding comparing conventional injection molding. Subsequently injection compression molding can be used for molding precise product. Optimal injection compression molding condition was obtained using design of experiment for plastic lens and the results were compared with conventional injection molding.
A Study on the Comparison of two and Three Dimensional Computer Simulations in Injection Molding
Park, Jae Woong ; Ahn, Ji Hye ; Park, Yong Min ; Lyu, Min-Young ;
Elastomers and Composites, volume 47, issue 4, 2012, Pages 347~354
DOI : 10.7473/EC.2012.47.4.347
There exist many merits in designing products and setting operational condition when computer aided engineering (CAE) is adopted in injection molding process. CAE also gives increasing efficient of molding, reducing developing time of product, and maintaining high quality products. Specially, it suggests design guidelines for new products and reducing wasting time to get steady state. Two and three dimensional computer simulations are available in injection molding and those results are somewhat different. However there are no guidelines for 2D and 3D computer simulations in using CAE in injection molding even though it is widely used in plastic industry. In this study, two and three dimensional computation results were compared for various part thickness, part shape, and number of finite element. Subsequently computational results were compared with experimental data such as pressure and temperature. The guidelines in two and three dimensional CAE analysis have been suggested through this study.
Preparation and Flame Retardancy of Poly(benzoxazole imide) Having Trifluoromethyl Group in the Main Chain
Yeom, Jin-Seok ; Choi, Jae-Kon ; Lee, Chang-Hoon ;
Elastomers and Composites, volume 47, issue 4, 2012, Pages 355~363
DOI : 10.7473/EC.2012.47.4.355
A series of poly(hydroxyamide)s (PHAs) having trifluoromethyl group were prepared by direct polycondensation of aromatic diimide-dicarboxylic acids with 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane by thionyl chloride and triethyl amine in N-methyl-2-pyrrolidinone (NMP). The PHAs exhibited inherent viscosity in the range of 0.54-0.96 dL/g at
in DMAc solution. All PHAs were readily soluble in a variety of organic solvents, whereas the polybenzoxazoles (PBOs) were quite insoluble except partially soluble in sulfuric acid. PHAs were converted to PBOs by thermal cycling reaction with heat of endotherm. The maximum weight loss temperature of the PHAs occurred in the range of
. The PBOs showed relatively high char yields in the range of 47-59%. Pyrolysis Combustion Flow Calorimeter (PCFC) results of the PBOs showed 12-19 W/g heat release rate (HRR), and 2.7-3.6 kJ/g total heat release (total HR). The HRR of PBO 1 showed the lowest value of 12 W/g, which was 37% lower than that of PBO 3 (19 W/g).