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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 46, Issue 4 - Dec 2011
Volume 46, Issue 3 - Sep 2011
Volume 46, Issue 2 - Jun 2011
Volume 46, Issue 1 - Mar 2011
Selecting the target year
Trends of Technologies for High Performance Polymer Barriers against Radiation
Lee, Gi-Bbeum ; Park, Sung-Eun ; Kim, In-Woo ; Jeong, Kwang-Un ; Lee, Hong-Ki ; Nah, Chang-Woon ;
Elastomers and Composites, volume 46, issue 2, 2011, Pages 94~101
The conventional radiation barriers may show some disadvantages such as heavy weight and possibility of poisoning human bodies because they are composed of lead plates or resin plates containing large amounts of lead powders. Another disadvantage may be direct penetration of radiation through small pin holes. In this article, technologies of multi-layered polymer barriers against radiation, which has been extensively focused recently, will be introduced. A new concept of radiation protection as well as improving endurance with employing nano-layered inorganic particles is introduced.
High Performance Barrier Technologies for Tire Innerliner
Kang, Yong-Gu ; Lee, Seong-Peal ; Han, Min-Hyun ;
Elastomers and Composites, volume 46, issue 2, 2011, Pages 102~111
The innerliner for a tire has excellent impermeability, air retention and good flex properties. The innerliner offers a role to improve performance parameter, such as air retention and tire durability that is of praricular importance for commercial tires. In order to improve the gas barrier properties of a innerliner, most of the innerliner rubbers, such as a halogenated butyl rubber(HIIR), brominated poly(isobutylene-co-isoprene)(BIIR), brominated polyisobutylene-co-paramethylstyrene(BIMS) are used as nanocomposites with nano fillers such as silicates, graphite etc. Innerliners based on nanocomposites may allow gauge adjustments and permeability reductions with potential improvement in tire durability. This article discusses potential innerliner permeablity reduction and compounding parameters on the properties of nanocomposite based innerliners.
Organic-Inorganic Hybrid Materials Technology for Gas Barrier
Kim, Ki-Seok ; Pa가, Soo-Jin ;
Elastomers and Composites, volume 46, issue 2, 2011, Pages 112~117
Recently, high growth potential of barrier materials industry including high performance packing materials was expected with increasing the national income and well-being culture. As high barrier materials, polymer nanocomposites have considerable attractions due to their excellent physical properties compared to conventional composite materials. In general, polymer nanocomposites were consisted of polymer matrix and inorganic fillers, such as layered silicate, carbon nanotubes, and metal- or inorganic nanoparticles. Among these materials, layered silicate which was called as the clay was usually used as nano-fillers because of naturally abundant and most economical and structural properties. Clay-reinforced polymer nanocomposites have various advantages, such as high strength, flammability, gas barrier property, abrasion resistance, and low shrinkage and used for automotive and packing materials. Therefore, in this paper, we focused on the need of gas barrier materials and materials-related technologies.
Technique Status of Carbon Fibers-reinforced Composites for Aircrafts
Kim, Ki-Seok ; Park, Soo-Jin ;
Elastomers and Composites, volume 46, issue 2, 2011, Pages 118~124
Recently, the need of new materials which have excellent physical properties and functional characteristics has been increased in all industries. In particular, body weight reduction via new materials in aerospace industry was significantly emphasized by the requirement of environmental protection through the fuel savings and reduction of greenhouse gas, i.e., carbon dioxide(
). Also, for various applications, the development of high performance custom materials with excellent physical properties was the current primary goal of materials science and technology. In this respect, carbon fiber-reinforced composites were the most candidates among the various materials. Indeed, carbon fiber-reinforced composites have been lately used as essential materials for the weight reduction of aircraft and the demand has increased remarkably. Therefore, in this paper, we focused on the need of carbon fiber composites in the fields of aircraft and technique status.
Concentration Effects on Improved Mechanical Properties of Chopped Kenaf Fiber Filled Polypropylene Composite
Oh, Jeong-Seok ; Lee, Seong-Hoon ; Kim, Kwang-Jea ;
Elastomers and Composites, volume 46, issue 2, 2011, Pages 125~131
The effects of chopped kenaf fiber concentration on mechanical property of polypropylene (PP) composite are investigated. The addition of kenaf increased the tensile strength, flexural modulus, impact strength, specific gravity, and HDT, while decreased the elongation%, flexural strength, and melt flow index. The increase of mechanical properties is due to increased surface area contacting between fiber and polymer matrix and fiber-fiber interaction. Volatile extractives in the kenaf seemed to decrease the interfacial adhesion between kenaf surface and PP.
Thermal Aging Behavior of H-NBR/NBR Blend
Choi, Won-Seok ; Kim, Gun-Wan ; Do, Je-Sung ; Yoo, Myung-Ho ; Ryu, Sung-Hun ;
Elastomers and Composites, volume 46, issue 2, 2011, Pages 132~137
In the present investigation, thermal aging behavior of H-NBR/NBR blend with various H-NBR content was investigated. Mixture of dicumyl peroxide and sulfur were used as a curing agent. The influence of the thermal aging of the H-NBR/NBR blends on the solid state properties such as tensile strength, elongation at break, hardness and abrasion resistance was investigated. Tensile strength was increased with increasing H-NBR content, while abrasion resistance was decreased. Both elongation at break and hardness were not affected by the addition of H-NBR. The properties such as hardness, tensile strength and elongation at break of the aged samples were lower than unaged samples. However, the rate of deterioration of those properties was decreased by increasing the H-NBR content, which indicated that improved thermal aging behavior was obtained by the addition of H-NBR. Abrasion loss was increased with increasing aging time, but it became less by the addition of H-NBR addition.
Influence of Inorganic Filler on Properties of EPDM Compounds
Choi, Sung-Seen ; Kim, Ok-Bae ;
Elastomers and Composites, volume 46, issue 2, 2011, Pages 138~143
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.
Effect of Cure System on the Life-time of Hydrogenated NBR O-ring using Intermittent Compression Stress Relaxation(CSR)
Lee, Jin-Hyok ; Bae, Jong-Woo ; Kim, Jung-Su ; Hwang, Tae-Jun ; Choi, Yu-Seok ; Baek, Kwang-Sae ; Jo, Nam-Ju ;
Elastomers and Composites, volume 46, issue 2, 2011, Pages 144~151
Intermittent CSR testing was used to investigate the degradation of a hydrogenated NBR(HNBR) O-rings, and also the prediction of its life-time. The cure system of HNBR O-ring was controlled as sulfur cure and peroxide cure system. An intermittent CSR jig was designed taking into consideration the O-ring's environment under use. The testing allowed observation of the effects of friction, heat loss, and stress relaxation by the Mullins effect. Degradation of O-rings by thermal aging was observed between 100 and
. In the temperature range of
, O-rings showed linear degradation behavior and satisfied the Arrhenius relationship. The activation energy of HNBR-S was about 70.6 kJ/mol. From Arrhenius plots, predicted life-times of HNBR-S O-ring were 31.1 years and 33.7 years for 50% and 40% failure conditions, respectively. In case of HNBR-P, the activation energy was about 72.1kJ/mol, and predicted life-times were 34.0 years and 36.5 years for 50% and 40% failure conditions, respectively. The peroxide cure system showed slower degradation rate and higher activation energy than the sulfur cure system.
Effects of CR Contents on Rubber Vulcanization and Mechanical Properties of NR/CR Blends
Ahn, Won-Sool ; Park, Dong-Ryul ;
Elastomers and Composites, volume 46, issue 2, 2011, Pages 152~157
Effects of CR contents in NR/CR blends on the vulcanization kinetics and miscibility were studied by dynamic DSC and TGA, as well as the mechanical properties. While the vulcanization activation energy showed a constant value of
kcal/mol regardless of CR contents, reaction rate, however, was observed to be somewhat lowered at increased CR contents. Partial miscibility was found between NR and CR phases at lower CR content of 3 wt%, but immiscibility was observed at higher CR content of 21 wt%. Mechanical properties were also affected by this miscibility, showing linear increase of compression set but decrease of tensile strength with CR contents in the blends.
Study on Type of Different Polyols for Physical Properties of Polyurethane Foam Under Sea Water
Kim, Sang-Bum ;
Elastomers and Composites, volume 46, issue 2, 2011, Pages 158~163
Rigid polyurethane foam (PUF) was synthesized with different contents of aliphatic polyester polyol, aromatic polyester polyol and aliphatic polyether polyol to know change of properties under sea water. UTM(universal testing machine), DSC(differential scanning calorimetry), hardness meter and FT-IR(Fourier transform spectroscopy) were used to study the PUF`s physical properties under sea water. Compressive strength and hardness of PUF decreased with increasing the content of aromatic polyester polyol under sea water as aging. According to the results of IR spectral analysis, reduction of urethane and urea peak was found and allophanate and biuret peak increased. Although glass transition temperature of PUF increased, mechanical properties of PUF decreased under sea water, because PUF gets brittle when crosslink density increase.
A Study on Improvement of Fire-resistant and Flame-retardant Properties of Silicone Rubber Composites Containing Perlite
Lee, Byung-Gab ; Lee, Jong-Hyeok ; Bang, Dae-Suk ; Won, Jong-Pil ; Jang, Il-Young ; Park, Woo-Young ; Jhee, Kwang-Hwan ;
Elastomers and Composites, volume 46, issue 2, 2011, Pages 164~170
In this study, silicone rubber filled with environmentally-friendly perlite was prepared by mechanical mixing in order to improve thermal properties, such as heat and fire resistances. We found that the properties of silicone rubber composites depended on perlite concentration by various characterization methods. Thermogravimetric analysis(TGA) indicated that the initial degradation temperature of silicone/perlite composite was higher than that of pristine silicone rubber. The gas torch test showed that the opposite side temperature of composite materials was remarkably low as compared to that of pristine silicone rubber. In addition, the composites containing 5 wt% and 10 wt% of perlite showed remarkable thermal stability at elevated temperatures according to the results of both fireproof furnace tests under the RABT condition and carbonization furnace tests. The images from a scanning electron microscope(SEM) showed the degree of dispersion of perlite in silicone rubber. Finally, it was confirmed that limited oxygen index(LOI) was increased with perlite concentration.