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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
Editor in Chief :
Volume & Issues
Volume 37, Issue 3 - Sep 2002
Volume 37, Issue 2 - Jun 2002
Volume 37, Issue 1 - Mar 2002
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Miscibility and Properties of Ethyl-Branched Polyethylene/Ethylene-Propylene Rubber Blends (II)
Cho, Ur-Ryong ;
Elastomers and Composites, volume 37, issue 2, 2002, Pages 79~85
Ethyl-branched polyethylene [PE(2)] containing 2mole% ethyl branch and three ethylene-propylene rubbers (EPR's) having the same ethylene(E)-propylene(P) molar ratio(E/P=50/50) with different stereoregularity, that is, random EPR (r-EPR), alternating-EPR (alt-EPR) and isotactic-alternating-EPR (iso-alt-EPR) were mixed for the investigation or their properties depending on the stereoregularity. Crystallinity of the prepared blends decreased with increasing content of amorphous EPR because of a decrease in both the degree of annealing and kinetics of diffusion of the crystallizable polymer content. With blend composition, crystallinity was reduced with the stereoregularity in EPR. The thermodynamic interaction parameter(x) for the three blend systems approximately equals to zero near the melting point. These systems were determined to be miscible on a molecular scale near or above the crystalline melting point or the crystalline PE(2). From the measurement of
, the behavior of PE(2) is mainly due to a diluent effect of EPR component. The spherulite size measured by small angle light scattering (SALS) technique depended upon blend composition, and stereoregularity of EPR. The size of spherulite was enlarged with the content of rubbery EPR and the decrease of stereoregularity in EPR.
Crack and Cutting Resistance Properties of Natural Rubber(NR) Compounds with Silica/Carbon Black Dual Phase Filler
Son, Woo-Jung ; Cho, Ur-Ryung ; Kim, Won-Ho ;
Elastomers and Composites, volume 37, issue 2, 2002, Pages 86~98
The application of silica/carbon black dual phase fillers to natural rubber(NR) compound was investigated. When the amounts of filler content were restricted to 60phr, the optimum ratio of dual phase fillers were 25phr/35phr of silica/carbon black. It was found that these new fillers give better overall performance in comparison with carbon black in tear strength, crack resistance, and cutting resistance. Also the thermal degradation resistance of NR vulcanizates which were filled with dual phase fillers was better than that of the carbon black. Dual phase fillers filled NR vulcanizates showed better viscoelastic properties, like tan
, for the wet skid resistance and rolling resistance of motor vehicle tires.
Filler-Elastomer Interactions. 6. Influence of Oxygen Plasma Treatment on Surface Properties of Carbon Blacks
Cho, Ki-Sook ; Zoborski, M. ; Slusarski, L. ; Park, Soo-Jin ;
Elastomers and Composites, volume 37, issue 2, 2002, Pages 99~106
In this work, the surface properties and mechanical interfacial properties of the carbon blacks treated by oxygen plasma were investigated. The surface properties of carbon black by oxidation process of oxygen plasma were studied in acid-base surface value, zeta potential, and X-ray photoelectron spectroscopy (XPS). And their mechanical interfacial properties of the carbon black/rubber composites were evaluated by the composite tearing energy (
). As a result, it was found that the introduction rate of oxygen-containing polar functional groups, such as carboxyl, hydroxyl, lactone, and carbonyl groups, onto the carbon black surfaces was increased by increasing the plasma treatment time. It revealed that the polar rubber, such as acrylonitrile butadiene rubber (NBR), showed relatively a high degree of interaction with oxygen-containing functional groups of the carbon black surfaces, resulting in improving the tearing energy (
) of the carbon black/acrlyonitrile butadiene rubber composites.
Prediction of Useful Life by Heat Aging of Motor Fan Isolating Rubber
Kim, W.S. ; Woo, C.S. ; Cho, S.J. ; Kim, W.D. ;
Elastomers and Composites, volume 37, issue 2, 2002, Pages 107~114
This paper discusses the accelerated heat aging tests were carried out to predict the useful life of EPDM isolating rubber components of ventilation fan motor for clean room. 20% compression set results changes as the threshold are used for assessment of the useful life and the time to threshold value were plotted against reciprocal of absolute temperature to give the Arrhenius plot. The useful life at variable temperatures and activation energy are obtained from the Arrhenius relationship. An accelerated test program to assess useful life can be represented an appreciable investment in time was designed. We also considered the effect of antioxidant agents.
Electrical and Mechanical Properties of Silicone Rubber for High Voltage Insulation
Lee, J.H. ; Ji, W.Y. ;
Elastomers and Composites, volume 37, issue 2, 2002, Pages 115~123
This study was carried out to investigate the influences or the vinyl content of polydimethylsiloxane(PDMS) and type of silica on the electrical and mechanical properties of silicone rubber far high voltage insulation. When the content of vinyl group was increased, cross-linking density and hardness were increased, and tensile strength, volume resistivity and tracking resistance were improved. The mechanical and electrical properties of silicone rubber reinforced with fumed silica were higher than those of silicone rubber reinforced with precipitated silica. It was found that the electrical and mechanical properties of silicone rubber were influenced greatly by the water contents of silica.
Depolymerization of waste Poy(butylene terephthalate) by saponification
Yoo, Ji-Hwan ; Na, Sang-Kwan ; Hong, Wan-Hae ; Kim, Jung-Gyu ;
Elastomers and Composites, volume 37, issue 2, 2002, Pages 124~133
Waste PBT powder was depolymerized by saponification under the mild temperature conditions(
) and atmospheric pressure. In depolymerization of PBT, sodium hydroxide was more effective than potassium hydroxide. The depolymerization increased with increasing reaction temperature and decreasing particle size. The reaction kinetics of depolymerization could be expressed by the shrinking unreacted core model without product layer, in which the surface reaction was a rate determining step. The activation energy was 98.1 KJ/mol. The recovery ratio of the TPA obtained from the depolymerized PBT particles of 85.1 and
for 6 hours was about 95%.