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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Elastomers and Composites
Journal Basic Information
Journal DOI :
The Rubber Society of Korea
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Volume & Issues
Volume 46, Issue 4 - Dec 2011
Volume 46, Issue 3 - Sep 2011
Volume 46, Issue 2 - Jun 2011
Volume 46, Issue 1 - Mar 2011
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Structural and Physical Properties of Reflective Sheets Prepared by Using Glass Beads
Lim, Du-Hyun ; Lee, Min-Ho ; Heo, Min-Yeong ; Ahn, Jou-Hyeon ; Park, Jin-Woo ; Yu, Ji-Hyun ; Kim, Jong-Seon ; Ryu, Ho-Suk ; Ahn, Hyo-Jun ; Kim, Ik-Hwan ;
Elastomers and Composites, volume 46, issue 4, 2011, Pages 277~283
In this study, engineering grade and high intensity reflective sheets were prepared with glass beads and their reflection performance and physical properties were investigated. The reflective sheets prepared by using glass beads are divided into enclosed or encapsulated lens type, depending on whether the glass beads are open in air or not. Because of an extra layer on the glass bead surface, the enclosed lens type reflective sheets show very little change in the properties by bad weather conditions, compared to encapsulated lens type reflective sheets. Optimization of the amount of glass beads on the surface was carried out, which determines the retroreflective properties. Enclosed and encapsulated lens type reflective sheets with various colors were prepared and their coefficients of retroreflection were determined. The encapsulated type reflective sheet with white color shows a coefficient of retroreflection of
, which is higher than the enclosed type (
). Effect of washing on the reflective property and adhesive power of the reflective sheets was investigated, and it is found that the number of glass beads decreased with washing and the aluminum layer deposited was damaged extensively in the encapsulated lens type reflective sheets.
Preparation and Physical Properties of Diamond Grade Reflective Sheets Using Microprism
Lee, Min-Ho ; Lim, Du-Hyun ; Heo, Min-Yeong ; Ahn, Jou-Hyeon ; Park, Jin-Woo ; Yu, Ji-Hyun ; Kim, Jong-Seon ; Ryu, Ho-Suk ; Ahn, Hyo-Jun ; Kim, Ik-Hwan ;
Elastomers and Composites, volume 46, issue 4, 2011, Pages 284~289
Prismatic reflective sheets were prepared using microprisms, and their retroreflection and structural properties were investigated and compared with encapsulated lens type reflective sheets based on glass beads. As prepared, the prismatic reflective sheets show well arranged array of microprisms. The arrangement of glass beads in encapsulated lens type reflective sheets is also found to be uniform without any cracks. However, during the coating process of the PET layer, the beads are coming out and the gaps are formed due to the application of high pressure. Even though the preparation method for reflective sheets based on microprisms is similar to that of reflective sheets based on glass beads, the method is relatively simple and cost effective, and also needs less time. Prismatic reflective sheets show higher coefficient of retroreflection from all entrance angles compared to reflective sheets based on glass beads. The results prove that the prismatic reflective sheets can be used for preparing the traffic sign boards to secure a clear view.
Study on the Solvent Effect in the Coating of Conductive Polythiophene Derivative
Pak, Na-Young ; Lee, Seong-Min ; Chung, Dae-Won ;
Elastomers and Composites, volume 46, issue 4, 2011, Pages 290~294
The surface resistance of poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT/PSS), which has appeared to be one of the most successful conductive polymers, is affected by the solvent. In this paper, pellet-type PEDOT/PSS was suspended in
, ethanol (EtOH), ethylene glycol (EG) or dimethylsulfoxide (DMSO), and coated on PET film. The surface resistances of the films made from EG or DMSO suspension were observed to be lower, nearly by 2 orders of magnitude, than that made from
suspension. No significant difference among four kinds of films was observed when the thermal properties and chemical structures were investigated by TGA and XPS, respectively. However, particle size of PEDOT/PSS was in the range of
in EG or DMSO, on the other hand, less than
. It is considered that the particle size of PEDOT/PSS in the suspension plays an important role for the surface resistance.
Synthesis and Thermal Properties of Aromatic Polyhydroxyamides Containing Imide Ring in the Main Chain
Wee, Doo-Young ; Choi, Jae-Kon ; Lee, Chang-Hoon ;
Elastomers and Composites, volume 46, issue 4, 2011, Pages 295~303
A series of new aromatic polyhydroxyamides (PHAs) containing imide ring were prepared by direct polycondensation reaction of imide-diacids and two types of bis(o-aminophenol)s including 3,3'-dihydroxybenzidine and 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane. The polymers were characterized by FT-IR, FT-NMR, DSC and TGA. The inherent viscosities of the PHAs measured at
in DMAC solution were in the range of 0.49-1.13 dL/g. PHA 2 and 3, except PHA 1, were soluble in polar solvents such as DMAc, DMF and NMP. PHA 4, 5, and 6 containing 6F group showed a higher solubility in less polar solvents. But the polybenzoxazoles (PBOs,) were insoluble in a variety of solvents except partially soluble in sulfuric acid. The PBO 1, 2 and 3 showed maximum weight loss temperature in the range of
and relatively high char yields in the range of 57.4-61.9 % under a nitrogen atmosphere. These results suggested that the introduction of imide or diimide ring in the main chain was effective in improving the thermal stability of PHAs and PBOs.
Preparation of Reactive Poly(ethylene-ter-1-hexene-ter-divinylbenzene) using Metallocene Catalysts
Kim, Dong-Hyun ;
Elastomers and Composites, volume 46, issue 4, 2011, Pages 304~310
In this study, we prepared poly(ethylene-ter-1-hexene-ter-divinylbenzene) using briged rac-
metallocene catalysts. Bridged rac-
catalyst showed relatively good results compared with unbridged one. When cocatalyst/catalyst molar ratio was 3000, catalytic activity indicated more than 8000(kg of polymer/
) which was very remarkable value. As a polymerization time increased, the weight-average molecular weight of the terpolymer gradually increased to some degree. In the case of a polymerization time of 50 minutes, the state of the terpolymer became amorphous. The range of the weight-average molecular weight and the densities of the terpolymer was 110,000~200,000 and
, respectively. The thermal properties and the structure of the terpolymer were also identified.
The Effect of Orientation of Magneto-responsible Particles on the Transmissibility of Magneto-rheological Elastomer
Lee, Joo-Hwan ; Chung, Kyung-Ho ; Yoon, Ji-Hyun ; Oh, Jae-Eung ; Kim, Min-Soo ; Yang, Kyung-Mo ; Lee, Seong-Hoon ;
Elastomers and Composites, volume 46, issue 4, 2011, Pages 311~317
The neodymium magnet inserted mold was proposed to orient magneto-responsible particles efficiently. The anisotropic magneto-rheological elastomer(MRE) was prepared using the new mold and the optimum amounts of the particles was 30 vol.%. As the orientation of particles was increased, the tensile strength of MRE was decreased, while the hardness of MRE was increased. It was found that the MRE containing 30 vol.% of magneto-responsible particles showed the maximum magneto-rheological effect. The ratio of shear modulus shift was 59% at the input current of 3 A. The transmissibility of MRE was decreased with increasing the input current and loading amounts of magneto-responsible particles. Therefore, the damping property of MRE could be improved by preparing the anisotropic MRE.
Mechanical Properties of Polyethylene/Polypropylene/Waste Tire Rubber Powder Composites
Choi, Jeong-Su ; Park, Cha-Cheol ;
Elastomers and Composites, volume 46, issue 4, 2011, Pages 318~323
To recycle the waste tire rubber powder, rubber powder composite for waterproof sheet was prepared, and analyzed the effect of the kind of resin and the amount of crosslinking agent on the mechanical property of the composites. The elongation-at-break of the PE composite increased more than 3 times as EPDM was added into rubber composites. As the content of the crosslinking agent increased, the tensile strength of composite increased as well. When recycled polypropylene was used, the increase in composite's tensile strength was more than 3 times. Therefore to use the recycled PP in composite is more effective rather than PP in term mechanical properties.
A Study on the Friction and Anti-abrasion Properties of Rubber Blends for Shoes Outsole
Pyo, Kyung-Duk ; Park, Cha-Cheol ;
Elastomers and Composites, volume 46, issue 4, 2011, Pages 324~328
Blends were prepared by mixing BR, SBR and NBR to CIIR, which is used for outsole, at various mixing ratio, and effect of the mixing ratio on abrasion resistance and coefficient of friction was analyzed. CIIR interferes the crystalline formation of BR in BR/CIIR blends and this could be one of the factors that rapidly decreases abrasion resistance of BR/CIIR blends.
peak area of CIIR/BR blends decreased as the amount of BR present in the blends increased, and similarly, the coefficient of friction tended to decrease. Stress relaxation rate and rebound resilience of CIIR/BR blends decreased with increasing BR content, and it was presumed that their rebound resilience was affected by stress relaxation rate.
Cure Characteristics, Physical Properties and Ozone Resistance of Butyl Rubber and EPDM Rubber Blends
Park, Chan-Young ; Hwang, Young-Bea ;
Elastomers and Composites, volume 46, issue 4, 2011, Pages 329~334
In general, butyl rubber(IIR : isobutylene isoprene rubber) has excellent gas permeability resistance and impact absorbance property as low resilience elastomer. In this experiment butyl rubber blends with EPDM(ethylene propylene diene monomer) were prepared by mechanical mixing method. Curing behavior, physical properties and ozone resistance etc. were subsequently examined. Measurement results of gas transmission rate test shows that butyl rubber contents above 50 wt% showed significant decrease in gas permeability resistant property. However, in butyl rubber/EPDM blend, EPDM contents above 25 wt% indicates no surface change due to improvement of ozone resistance under the condition of 50 pphm,
, 120 hrs.
A Study on the Manufacturing, Mechanical Properties,Abrasion Resistance, and Slow Crack Growth Resistance of the Recycled Polyethylene/Fly Ash Composites
Kye, Hyoung-San ; Shin, Kyung-Chul ;
Elastomers and Composites, volume 46, issue 4, 2011, Pages 335~342
The virgin and recycled polyethylene composites with various ratio of fly ash were manufactured by using a fully intermeshing co-rotating twin screw extruder for the reuse of fly ash from power plant and post-consumed polyethylene. Fly ash were blended with virgin HDPE and recycled polyethylene at the weight fraction of 0 to 40 wt.%. Mechanical properties such as yield strength, abrasion resistance, and slow crack resistance were measured with ISO and ASTM standards. The experimental results for the various composites showed that the elongation at break and the yield stress of the composites decreased with increasing fly ash contents. Generally, the abrasion resistance of PEs decreased with increasing sandpaper grits but the abrasion resistance of the composites increased with fly ash content at finer abrasive surface. The slow crack growth resistance of virgin HDPE, recycled JRPE and the JRPE composite showed higher slow crack growth resistance up to 50% of load at notch depth of 20% and 30%, but KRPE and the KRPE composite showed much lower resistance than virgin HDPE, JRPE and the JRPE composite. Time to break, measured with NCLS test method, of all PEs and the composites satisfies the regulation of Korean Industrial Specification for sewer pipe and support application.
Synthesis of Polyurethane Foam/Organonanoclay/Phosphates Composites and its Characterization
Park, Kyeong-Kyu ; Lee, Sang-Ho ;
Elastomers and Composites, volume 46, issue 4, 2011, Pages 343~351
We prepared polyurethane foam/cloisite30B/phosphates composites and characterized their rise time, density, cell morphology, and thermal properties. The composites were synthesized with polyadipatediol-cloisite30B composite (f=2.0), polyether-polyol (f=4.6), polymeric 4,4-diphenyl methane diisocyanate (f=2.5), and D-580 (phenyl polyoxyalkenyl phosphate). As a blowing agent, cyclopentane and distilled water were used at various concentrations of D-580 from 0 to 2.81 wt%. The rise times of PUF/Closite30B/Phosphate composites blown with distilled water were faster than those blown with cyclopentane by 30%. The composites blown with cyclopentane had spherical-shape cells and the cell diameter was decreased with increasing D-580 wt%. While
of the composites blown with cyclopentane linearly decreased with increasing the D-580 content, the
of the composites blown with distilled water increased with the D-580 content. All PUF/Closite30B/Phosphate composites began to decompose from
. The composites blown with cyclopentane showed the second thermal decomposition at temperatures higher than
. The thermal stability of all composites increased with the D-580 content. The effect of D-580 on the thermal stability of the composites was measured higher at the composites blown with distilled water.