• Title/Summary/Keyword: EPDM rubber

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Preparation of conductive EPDM rubber sheets by electroless Ni-plating for electromagnetic interference shielding applications (무전해 Ni 도금법을 이용한 전자파 차폐용 도전성 EPDM 고무의 제조)

  • Lee, Byeong Woo;Cho, Soo Jin;Yang, Jun Seok
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.25 no.5
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    • pp.193-198
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    • 2015
  • In the study, electroless Ni-plating on flexible ethylene-propylene-diene-monomer (EPDM) rubber sheets for the application of an insert block for shielding electromagnetic interference of multi cable transit (MCT) systems was investigated. Ni crystallinity and adhesion have been found to vary with processing parameters such as pH and temperature of the plating bath. It was shown that Ni-films having the high crystallinity and optimum electric conductivity were obtained on EPDM rubber sheets under pH 7 and 8 at $60{\sim}70^{\circ}C$. The conductive Ni-plated EPDM rubber prepared at pH 7 at $70^{\circ}C$ showed the enhanced adhesion and electric conductivity, and the high electromagnetic interference shielding effect in the 400 MHz~1 GHz range.

Electrochemical Properties of HRP Immobilized Biosensor bound with EPDM (EPDM으로 결합된 HRP 고정 바이오센서의 전기화학적 특성)

  • Yoon, Kil-Joong
    • Elastomers and Composites
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    • v.42 no.2
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    • pp.112-118
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    • 2007
  • An HRP immobilized carbon paste electrode, which was bound by EPDM, was newly fabricated and its electrochemical properties were investigated for the purpose of validating the new possibility for the practical use of biosensor. In the experimental range of substrate concentration, Lineweaver-Burk plot of the signal showed a good linearity. This means that HRP was embedded effectively to preserve its identity in the bulk of composite electrode materials and EPDM is a recommendatory binder. When the electrode was run at low operating potential($0.0\sim-1.0$ V vs. Ag/AgCl), it showed a high sensitivity and a good reproducibility. Especially the mechanical stability of the dried rubber was a remarkable breakthrough to get over a difficulty in putting the carbon-paste electrode bound with silicon oil to real use.

Effect of Degree of Interfacial Interlinking on Adhesive Strength and Fracture Morphology of Rubber Layers (고무층간 가교정도가 접착강도 및 파괴형태에 미치는 영향)

  • Kim, Hyeon-Jae;Kaang, Shin-Young;Nah, Chang-Woon
    • Elastomers and Composites
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    • v.34 no.1
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    • pp.31-44
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    • 1999
  • Interfacial adhesive strength between the fully-crosslinked and partially-crosslinked rubber layers were Investigated at the temperature range of $30{\sim}120^{\circ}C$ for four different rubbers(NR, SBR, EPDM, BIMS). The surfaces of interfacial failure were also investigated using a scanning electron microscopy(SEM). The physical interlinking played a major role in the adhesive strength between the fully-crosslinked rubber layers. When a partially-crosslinked rubber layer was bonded to the fully-crosslinked one, the chemical as well as the physical interlinking affected the adhesive strength. NR showed a "interfacial knotty tearing" pattern, while EPDM showed a typical "cross-hatched" one when the adhesive strength approached to the cohesive tear strength of each material.

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Studies on Incombustibility Improvement of EPDM Rubber with $Al(OH)_3$ and $Sb_2O_3$ ($Al(OH)_3$$Sb_2O_3$의 첨가에 따른 EPDM계 고무의 난연성 향상 연구)

  • Kim, Jin-Yong;Lee, Won-Bok;Lim, Dae-Hyun;Suh, Hyuk;Rhee, Young-Woo
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2009.11a
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    • pp.449-452
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    • 2009
  • In order to improve incombustibility of EPDM(Ethylene propylene diene monomer)-based rubber, inorganic materials as $Al(OH)_3$ and $Sb_2O_3$ were added. The mechanical and thermal properties have been measured for vulcanized rubber loaded with different concentrations of $Al(OH)_3$ and $Sb_2O_3$. As inorganic material contents increases from 5phr to 30phr, the specific gravity and hardness increase while elongation at break decreases. This study performed incombustibility test and thermal analysis through TGA(Thermogravimetric Analyzer). As a results, incombustible and thermal properties of EPDM-based rubber were improved as $Al(OH)_3$ and $Sb_2O_3$ contents increase.

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A Study on the Manufacturing of Cellular RubBer Products with NR, SBR, NBR EPDM EPDM (NR, SBR, NBR 및 EPDM 발포(發泡)고무의 제조연구(製造硏究))

  • Choi, Sei-Young;Paik, Nam-Chul
    • Elastomers and Composites
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    • v.16 no.1
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    • pp.3-13
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    • 1981
  • The purpose of this dissertation is to study the physical properties of cellular rubber products for industrial use. Vulcanization characteristics were investigated by usingcure curve that had obtained by means of Rheometer. The results of physical properties, vulcanization characteristics and foaming states are as follows. 1. The test results for vulcanization characteristics of NR compounds indicated that in the recipe R-1. When accelerator D is used, the optimum conditions of vulcanizate are obtained, while formula R-2 and R-3 have shown higher torgue at curing time, $1{\sim}2$ minutes. Cellular rubber product test in terms of compression set and compression deflection has also met the requirements of SAE. 2. For SBR compounds, S-1 formula was the best in terns of vulcanization characteristics, and for the blowing structure of cellular rubber products, formula S-3 in which accelerator M is added was fair. All other test results, such as compression set and compression deflection properties met SAE requirements. 3. NBR compound (N-1) including accelerator TT was the best in terms of vulcanization characteristic and also blowing structure. All other properties listed above met requirements, particulary for oil resistance test. 4. In the test of EPDM compounds, when mixed accelerator, M and TT, is used(formula E-1) the best results were obtained. Since EPDM is hydrocarbon elastomer, oil resistance test failed. All other properties met the requirement specified in SAE.

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A Study on Composites of Ethylene-Vinyl Acetate Copolymer and Ethylene-Propylene-Diene Rubber with Aluminum Hydroxide as a Fire Retardant

  • Lee, Yu Jun;Lee, Su Bin;Jung, Jae Young;Lee, Dam Hee;Cho, Ur Ryong
    • Elastomers and Composites
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    • v.51 no.2
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    • pp.93-98
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    • 2016
  • The composites of EVA/EPDM including aluminum trioxide (ATH) as a fire retardant were manufactured for the purpose of improving low temperature property and flame resistance in the rubbery materials. The ratio of EVA to EPDM didn't affect the flame resistance of the rubber composites. The addition of ATH resulted in increase of the flame resistance. In the evaluation of the cold resistance, the increasing EPDM content showed enhancement of cold resistance in the composites due to increasing low Tg EPDM. It was found out that tensile strengths of the composites showed a maximum value at 100 phr of ATH by reinforcing effect, but a minimum value at 200 phr of ATH owing to slippage between the flame retardant by the external stress. In the measurement of solvent resistance in tetrahydrofuran, the increasing ATH content yielded enhancement of solvent resistance by reducing swelling of the composite, and increasing EPDM content also resulted from increase of the solvent resistance by reduction of polarizability as well as increase of crosslink in the composites.

Studies on the Ozone Resistance and Physical Properties of SBR/EPDM Blend Compound due to EPDM Content Variation (EPDM 함량 변화에 따른 SBR/EPDM 블렌드 혼합물의 내오존성과 물리적 성질에 관한 연구)

  • Ha, Ki-Ryong;Lee, Jong-Cheol;Kim, Tae-Geun;Hwang, Ki-Seob
    • Elastomers and Composites
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    • v.43 no.1
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    • pp.8-17
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    • 2008
  • Styrene-butadiene rubber(SBR) has good abrasion resistance, miscibility, and anti-vibration property. however, it is easily damaged by ozone and swelled by hydrocarbon fluids because of unsaturation part in main chain, that causes loss of visco-elasticity and reduction of product's life cycle. Therefore, object of this study is to cope with this problem. SBR is blended with various proportion of ethylene-propylene-diene terpolymer(EPDM), which has excellent ozone and oxygen resistance, to improve physical properties and ozone resistance, and diverse analytical techniques are used to measure morphology, glass transition temperature$(T_g)$, ozone-resistance, degradation temperature, static spring constant, hardness for considering a suitability for anti-vibration industrial product. We found that the blend consisting of SBR 70% and EPDM 30% showed no crack after ozone test and good miscibility between SBR and EPDM from this study.

Effect of Chromium Chloride on the Mechanical and Dielectric Properties of EPDM Rubber

  • Salem, M.A.;Khaled, M.A.;Hussein, A.M.;Elway, E.
    • Macromolecular Research
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    • v.11 no.4
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    • pp.256-259
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    • 2003
  • Measurements of Young's modulus, dielectric loss and a.c. conductivity have been carried out on EPDM rubber samples loaded with different concentrations of $CrCl_3$ (0,2,4 and 6 phr). The values of Young's modulus was found to be linearly dependent on the $CrCl_3$ content. Variation of the dielectric loss with temperature showed that $CrCl_3$ may act as plasticizer. However, at higher frequencies the dielectric loss was found to be independent of frequency and the rubber samples may behave as non-polar dielectric. Investigations of the a.c conductivity suggested that the conduction in these rubber samples can be described by small polaron tunneling. In addition, conductivity was found to increase with $CrCl_3$ content.

Influence of Inorganic Filler on Properties of EPDM Compounds (무기 충전제가 EPDM 배합물의 특성에 미치는 영향)

  • Choi, Sung-Seen;Kim, Ok-Bae
    • Elastomers and Composites
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    • v.46 no.2
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    • pp.138-143
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    • 2011
  • EPDM compounds and vulcanizates containing inorganic filler such as talc, calcium carbonate, or clay as well as carbon black were prepared, and the influence of inorganic filler on properties of the EPDM compounds and vulcanizates were investigated. The bound rubber contents did not significantly increase even though the inorganic filler was added. There were big aggregates in the EPDM samples with high loading inorganic filler. By adding the inorganic filler, the cure times tended to increase and the delta torque decreased. The modulus were on the whole decreased, whereas the elongation at break, tensile strength, and tear strength were increased by adding the inorganic filler. The decreased modulus and increased elongation at break can be explained with the decreased delta torque, the increases of tensile strength and tear strength can be explained with the increased elongation at break. By adding the inorganic filler, level of reinforcing in the EPDM compounds did not increase and the crosslink density decreased.

Electrochemical Combined-Stress Degradation Test and Failure Mechanisms of EPDM Rubber for Automotive Radiator Hoses (자동차 냉각기 호스용 EPDM 고무의 전기화학적 복합노화시험 및 고장메커니즘)

  • Kwak, Seung Bum;Choi, Nak Sam;Shin, Sei Moon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.37 no.1
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    • pp.1-8
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    • 2013
  • Coolant rubber hoses for automotive radiators can degrade under thermal and mechanical loadings and thus fail owing to the influences of locally formed electricity. In this study, an advanced test method was developed to simulate the failure of a rubber hose. The aging behavior of carbon-black-filled ethylene-propylene diene monomer (EPDM) rubber used as a radiator hose material under a combination of electrochemical stresses and tensile strain was analyzed. The changing behaviors of the current and the resistance as a function of the aging time were analyzed in consideration of the tensile strain, voltage, and aging temperature. Sectioned specimens clarified the failure mechanisms of the aged skin layer under the combined electrochemical stresses.