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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 48, Issue 4 - Dec 2013
Volume 48, Issue 3 - Sep 2013
Volume 48, Issue 2 - Jun 2013
Volume 48, Issue 1 - Mar 2013
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Recovery Behaviors of Natural Rubber Composites Thermally Aged in Altering Medium Systems of Air and Water
Choi, Sung-Seen ; Kim, Ok-Bae ;
Elastomers and Composites, volume 48, issue 3, 2013, Pages 181~189
DOI : 10.7473/EC.2013.48.3.181
Unfilled, carbon black-filled, and silica-filled natural rubber (NR) composites were aged with a circular deformation at
and the recovery behaviors were investigated. The samples were aged under the altering aging medium systems of air and distilled water every day for 10 days. The order of the recoveries according to the filler systems was unfilled > silica > carbon black. The recoveries of the samples aged in the air to water altering system were greater than those of the samples aged in the water to air altering system. The initial aging medium dominantly influenced the deformation level.
A Study on Polyurethane Adhesive Based Polyester Polyol Polymerized from Sebacic Acid
Jin, Kyung Ho ; Kim, Min Su ; Cho, Ur Ryong ;
Elastomers and Composites, volume 48, issue 3, 2013, Pages 190~194
DOI : 10.7473/EC.2013.48.3.190
In this study, sebacic acid made from castor oil was used as monomer with isophthalic acid and glycols for polyester polyol synthesis. Polyurethane adhesive was synthesized from the various polyester polyol. From the result of adhesion strength test, polyester polyol made from sebacic acid showed better adhesive force than that of adipic acid due to higher cohesive energy. Branched glycol containing methyl group represented better adhesion than linear glycol. In the chain extender, adhesion strength increased going from PG, EG, BD. From the measurement of TGA, BD showed the best heat stability, and followed by PG, EG. Glass transition temperature increased in the order PG, EG, BD by the result of DMA.
Thermoplastic Polyurethane (TPU)/Ethylene-Propylene-Diene Monomer Rubber (EPDM) and TPU/Polybutadiene Rubber (BR) Blends for the Application of Footwear Outsole Materials
Kim, Ji-Hoo ; Kim, Gue-Hyun ;
Elastomers and Composites, volume 48, issue 3, 2013, Pages 195~200
DOI : 10.7473/EC.2013.48.3.195
The main objective of this study is to improve abrasion resistance and wet slip resistance of thermoplastic polyurethane (TPU) by blending with ethylene-propylene-diene monomer rubber (EPDM) or polybutadiene rubber (BR) for the application of the footwear outsole materials. With addition of 10 wt% of EPDM or BR, TPU/EPDM and TPU/BR blends exhibited higher NBS abrasion resistance, tensile properties and wet slip resistance than TPU. However, with further increasing content of EPDM and BR, abrasion resistance and tensile properties of the blends decreased. Improvement in abrasion resistance and tensile properties with 10 wt% of addition of EPDM or BR may be due to better microphase separation of TPU.
Physical Properties of the Silica-Reinforced Tire Tread Compounds by the Increased Amount of Vulcanization Agents
Seo, Byeongho ; Kim, Ki-Hyun ; Kim, Wonho ;
Elastomers and Composites, volume 48, issue 3, 2013, Pages 201~208
DOI : 10.7473/EC.2013.48.3.201
In this study, effect of different amounts of sulfur and vulcanization accelerators in the acrylonitrile styrene-butadiene rubber (AN-SBR)/silica compounds on the properties of tire tread compound were studied. As a result, cure rate and degree of cross-linking of the compounds were increased due to enhanced cross-linking reactivity by the increased amounts of sulfur and vulcanization accelerators. Also, abrasion resistance and the mechanical properties such as hardness and modulus of the compounds were improved by enhanced degree of cross-linking of the compounds. For the dynamic properties, tan
was increased due to the increase of glass transition temperature (
) by enhanced degree of cross-linking of the compound, and tan
was decreased. Initial cure time (
) showed the linear relationship with tan
. This result is attributed that reduced initial cure time (
) of compounds by applying increased amount of curatives can form cross-linking in early stage of vulcanization that may suppress development of filler network. This result is verified by observation on the surface of annealed compounds using AFM (atomic force microscopy). Consequently, decreased initial cure time is considered a very important parameter to reduce tan
through reduced re-agglomeration of silica particles.
A Study on the Reduction of VOCs Generated from Vehicle Interior Parts and Materials Using Visible-light Responsive Photocatalyst
Choi, Sei-Young ; Yang, Seung-Gi ;
Elastomers and Composites, volume 48, issue 3, 2013, Pages 209~215
DOI : 10.7473/EC.2013.48.3.209
On this study, visible-light responsive photocatalyst prepared by sol-gel method was evaluated the effect of the reduction of volatile organic compounds (VOCs) occurred in vehicle interior and its property was examined. According to UV/visible result, visible-light responsive photocatalyst was found that the UV-visible peak is red shift at 420nm, is sensitive in the visible light region. With vehicle interior parts and materials coated visible-light responsive photocatalyst, VOCs was measured by GC/MS. Measuring the VOCs generated from vehicle interior parts and materials, the reduction of VOCs was confirmed.
A Study on the Phase Separation and Mechanical Properties of Wood Flour-Polypropylene Composites
Lee, Kyoung Hee ; Byon, Sungkwang ;
Elastomers and Composites, volume 48, issue 3, 2013, Pages 216~220
DOI : 10.7473/EC.2013.48.3.216
The phase separation in Wood Flour-Polymer Composite (WPC) was investigated and the reasons for change in mechanical properties with the content of wood flour were explored. The wood flour-polypropylene composite samples with different wood flour contents were prepared. From differential scanning calorimetry (DSC) thermograms of WPC samples, the trend of crystallinity and melting temperature (
) were analyzed. The crystallinity and melting temperature increased and then decreased as the content of wood flour increased. From these results, it was confirmed that at the low wood flour content the wood flours were dispersed into the polypropylene matrix but at the high wood flour content, the phase separation between polymer and wood flour phases appeared. The tensile strength of WPC samples was continuously decreased with the increase of wood flour content. At a low wood flour content, the low interfacial bonding and the decrease in crystallinity were the main reasons for the decrease in tensile strength with the increase of wood flour content. At a high wood flour content, the decrease in tensile strength resulted from the interfacial defects between the polymer and wood flour phases. The impact strength of the WPC sample showed the maximum behavior with the content of wood flour. At a low wood flour content, the impact strength was enhanced owing to the decrease in brittleness, which results from the decrease in crystallinity. At a high wood flour content, however, the impact strength decreased due to phase separation.
A Study on the Volatile Organic Compounds Analysis Method for Visible Light-Responsive Photocatalyst Treated Vehicle Interior Materials
Choi, Sei Young ;
Elastomers and Composites, volume 48, issue 3, 2013, Pages 221~224
DOI : 10.7473/EC.2013.48.3.221
In this study, VOC analysis method of vehicle interior materials and parts treated to visible-light responsive photocatalyst was tested by sample bag filled with air instead of nitrogen. As a result, when analyzed VOC of vehicle interior materials and parts, sample bag filled with the nitrogen was not confirmed of effect reducing VOCs and formaldehyde. However, VOCs and formaldehyde of sample bag that was filled with air instead of nitrogen, decreased significantly. Reaction effect for visible light-responsive photocatalyst was confirmed that sample bag of vehicle interior materials and parts should be filled with air instead of nitrogen.
Improvement of Abrasion and Debris on Styrene-Butadiene-Styrene Block Copolymer with Carboxylated SBR Latex and Zinc Oxide
Lee, Jin Hyok ; Bae, Jong Woo ; Kim, Jung Su ; Yoon, Yoo-Mi ; Jo, Nam-Ju ;
Elastomers and Composites, volume 48, issue 3, 2013, Pages 225~231
DOI : 10.7473/EC.2013.48.3.225
In this study, we observed the effect of carboxylated SBR latex and zinc oxide on styrene-butadiene-styrene( SBS) composites for improving abrasion and debris. SBS composite, which added only silica, showed poor mechanical properties, NBS abrasion, and debris, caused by strong filler-filler interaction of silica. In case of adding carboxylated SBR latex, mechanical properties, NBS abrasion and debris of SBS composite were improved. Because of carboxyl group of carboxylated SBR latex interacted with silanol group of silica. Both carboxylated SBR latex and zinc oxide were added, SBS composite showed highest mechanical properties, NBS abrasion, and debris by forming ion cluster between carboxylated SBR latex and zinc oxide. By FT-IR analysis, ion clusters were confirmed that observed zinc carboxylated group stretch peak at
range. SBS composite, SC-4, showed excellent mechanical properties ; tensile strength
, elongation 936%, tear strength 59.4kgf/cm ; and excellent abrasion characteristics ; NBS abrasion 338%. Also, debris of SC-4 was minimized and showed wave-shape in fracture surface.
Study on Self-Healing Asphalt Containing Microcapsule
Kwon, Young-Jin ; Hong, Young-Keun ;
Elastomers and Composites, volume 48, issue 3, 2013, Pages 232~240
DOI : 10.7473/EC.2013.48.3.232
Microcapsules having healing agent were prepared in which 2,6-dimethylphenol (DMP) as a healing agent forms the core and melamine/formaldehyde resin forms the shell. Microcapsule-contained asphalts showed better mechanical properties than non-contained ones. And as the rest time passed the impact strength of microcapsule-contained asphalt was getting higher than that of asphalt without the microcapsule. As the rest time of 15 days passed, the original strength was restored. This tells that microcapsule-contained asphalt had the ability of self-healing. X-ray photos proved that DMP on asphalt fracture surface, which were burst out of the microcapsules when cracks occurred on asphalt, were polymerized to polyphenyleneoxide and this PPO covered the crack and healed the damage.
Mechanical Properties of Polyurethane Foam Prepared from Prepolymer with Resin Premix
Kim, Tae Sung ; Park, Chan Young ;
Elastomers and Composites, volume 48, issue 3, 2013, Pages 241~248
DOI : 10.7473/EC.2013.48.3.241
Polyester type polyurethane foam has low hydrolysis resistance. It was overcome with addition of acrylic polyol by quasi prepolymer method. Tensile strength and hardness of polyurethane foam contained acrylic polyol was increased with increasing of acrylic polyol contents. But split tear strength and tear strength was slightly changed. Hydrolysis resistance of polyurethane foam was measured by loss % of tensile strength. It was improved with increasing of acrylic polyol contents from 25.5g to 102g.