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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 39, Issue 4 - Dec 2004
Volume 39, Issue 3 - Sep 2004
Volume 39, Issue 2 - Jun 2004
Volume 39, Issue 1 - Mar 2004
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Frequency Dependency of Electrical Property Stabilization during Vulcanization of Modified NR/IR Blends
Ahn, Won-Sool ;
Elastomers and Composites, volume 39, issue 3, 2004, Pages 179~185
Frequency dependency or electrical property stabilization during vulcanization of modified NR/IR composite materials was studied using in-situ electrical property measuring technique. Volume resistivity(p) before and after vulcanization reaction of the sample was measured as the function or frequency in the range or 1Hz to 10kHz at reaction temperatures of 130, 140, 150, and
, respectively. A double stabilization mode of frequency dependency was observed, in which a slow stabilization process of p to a value of ca.
occurred after a drastic initial decrease from ca.
. In addition, notable temperature dependencies of p values were also observed before and after vulcanization reaction, that is, p values at 130 and
after vulcanization were observed as about 1/3 of those values before vulcanization. All the observed facts were considered as the results from the interaction between the electrode and the bulk sample materials, i.e., electronic charge-discharge, and from the structure change of samples including CB rearrangement by the vulcanization.
The Effects of Baldness on the Compression-Rebounding Properties of Shoe Midsole
Park, Cho-Cheol ;
Elastomers and Composites, volume 39, issue 3, 2004, Pages 186~192
Compression and rebounding properties of IP(injection phylon), PH(phylon) and PU(polyurethane) foams were studied. The compression stress, rebounding stress, loss compression energy and storage compression energy of foams were decreased with increasing hardness of foams. The compression stress, loss compression energy of IP foams were lower than those of PH and PU. Rebounding stress and storage compression energy of PU foams were higher than those of IP and PH. The compression stress and rebounding of PH foam were lower than those of IP and PU.
The Prediction of Phase Morphology of Injection Molded Polymer Blends
Son, Young-Gon ;
Elastomers and Composites, volume 39, issue 3, 2004, Pages 193~208
Morphology of injection molded polymer blend was investigated by experimental and theoretical approach. In experiments, the effects of injection speed and injection temperature on the morphology of injection molded MPPO/Nylon 6 blend were investigated. The morphology distribution across the part thickness was clearly observed in injection molded blend. We could observe several distinct regions across the thickness of molded part: skin layer, subskin layer and core region. The skin layer where the dispersed phase is fine and highly deformed to the flow direction is observed to be located near the part surface. The subskin layer located at inner region of the skin layer also observed. In the subskin layer, the dispersed phase is coarser than that of skin layer and deforms to the flow direction. Based on the experimental results, the calculation scheme to predict the morphology of injection molded polymer blend was suggested. The morphology of injection molded polymer blend could be predicted in corporation with the result of flow analysis obtained from commercial software for injection molding process and the theory of drop behavior under the flow. The suggested calculation scheme could predict the effect of injection conditions on the morphology of injection molded parts.
Synthesis and Characteristics of Cationic Polyurethane-Acrylates as a Retention Aid
Han, Chul ; Kim, Doo-Won ; Yoon, Doo-Soo ; Kim, Sun ; Hong, Wan-Hae ; Kim, Jung-Gyu ;
Elastomers and Composites, volume 39, issue 3, 2004, Pages 209~216
Two types of polyurethane-acrylate polymer were synthesized by reaction of 2-hydroxyethyl methacrylate(HEMA), acrylamide(AA), and polyurethane prepolymer. Water-soluble cationic polyurethane/acrylate retention aids were prepared by using polyurethane-acrylate, benzyl chloride and distilled water. The retention, drainage and strength properties of the retention aids were investigated. The retention of cationic polyurethane/acrylate type retention aids maintained around 70 % regardless of nm. COD value of white water was much reduced by adding the retention aids to it. Drainage property was also improved by addition of the retention aids. In addition, specific compression strength of the paper was improved a little by addition of the retention aids. PU-HEMA type showed better performance than PU-AA in terms of compression strength of the paper.
On the Properties of TLCP/PBT Blends Prepared by In Situ Polymerization in PBT Solution
Choi, Jae-Kon ; Park, Il-Soo ; Kim, Sun ; Choi, Yoo-Sung ; Lee, Eung-Jae ; Jo, Byung-Wook ;
Elastomers and Composites, volume 39, issue 3, 2004, Pages 217~227
A new thermotropic liquid crystalline polymer(TLCP) containing a triad aromatic ester type mesogenic unit and butylene terephthalate unit(BT) in the main chain was synthesized by polycondensation reaction. The TLCP synthesized showed nematic mesophasic behavior and its transition temperature from solid to mesophase was
. The TLCP/PBT blends were prepared by in-situ polymerization in PBT solution and characterized by differential scanning calorimeter(DSC), thermogavimetric analyzer(TGA), scanning electron microscope(SEM), x-ray diffractometer(XRD), and dynamic mechanical thermal analyze, (DMTA). The blends showed well dispersed TLCP phases with domain sizes
in the PBT matrix. As the increasing TLCP content from 5 to 20 wt%,
values of pure PBT in the blend were increased because TLCP acts as a nucleating agent in the PBT matrix. The mechanical properties of the blends depended on the TLCP contents because the TLCP acted effectively as a reinforcing material in the PBT matrix. The blends showed good interfacial adhesion between the TLCP phase and PBT matrix.The blends prepared by in-situ polymerization showed higher mechanical properties and well dispersed TLCP domains than those of the blends prepared by melt blending.
Viscoelastic Modeling of Automotive Bushing for Axial Mode
Lee, Seong-Beom ; Lee, Su-Young ;
Elastomers and Composites, volume 39, issue 3, 2004, Pages 228~233
A bushing is a device used in automotive suspension systems to reduce the load transmitted from the wheel to the frame of the vehicle. A bushing is a hollow cylinder, which is bonded to a solid steel shaft at its inner surface and a steel sleeve at its outer surface. The relation between the force applied to the shaft and the relative deformation of a bushing is nonlinear and exhibits features of viscoelasticity. Since a force-displacement relation for bushings is important for multibody dynamics numerical simulations, the relation is expressed in terms of a force relaxation function and a method of determination by experiments on bushings has been developed. For the nonlinear viscoelastic axial response, Pipkin-Rogers model, the direct relation of force and displacement, has been derived from experiment. It is shown that the predictions by the proposed force-displacement relation are in very good agreement with the experimental results.
Electrical Properties and Characterization of 3-Methylthiophene Impregnated Polyurethane films
Choi, Sei-Young ; Choi, Kyo-Chang ; Lee, Eun-Kyoung ;
Elastomers and Composites, volume 39, issue 3, 2004, Pages 234~243
The elastomeric and conductive polyurethane (PU) films were prepared by poly(propylene glycol) (PPG), toluene 2,4-diisocyanate, 3-methylthiophene (3-MT) at various preparation conditions, such as the reaction time, the
concentration, the weight ratio of the 3-MT to PU and the reaction temperature for the diffusion-oxidative reaction. The conductive poly (3-methylthiophene) (PMT) layers via the diffusion-oxidative reaction of 3-MT and ferric chloride were formed by immersing the film in organic solution of
/ethyl acetate. The preparation conditions greatly affected the electrical conductivity of the 3-MT/PU composite. The effects of the reaction time and temperature on morphology and surface free energy were investigated by scanning electron microscopy (SEM) analysis and contact angle measurement, respectively. The conductivity of the composite was as high as 42 S/cm.