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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 49, Issue 4 - Dec 2014
Volume 49, Issue 3 - Sep 2014
Volume 49, Issue 2 - Jun 2014
Volume 49, Issue 1 - Mar 2014
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Melt Grafting of EPDM and Itaconic Acid: Effect of Reaction Conditions and Initiator Type/Concentration
Kim, Ki-Jae ; Bae, Jong-Woo ; Kim, Jung-Soo ; Lee, Jin-Hyok ; Kim, Gu-Ni ; Oh, Sang-Taek ; Kim, Wonho ;
Elastomers and Composites, volume 49, issue 3, 2014, Pages 181~190
DOI : 10.7473/EC.2014.49.3.181
Melt grafting of itaconic acid (IA) onto an ethylene-propylene-diene terpolymer (EPDM) with various organic peroxide initiators was performed. Finding the optimum mixing conditions and concentration of ingredients is critical for effective grafting and optimum properties of grafted materials. This study focused on the effects of mixing conditions (temperature and time), initiator type/concentration and monomer concentration on the grafting degree and efficiency, melt flow index, and gel content of EPDM-g-IA. The initiator, 2,5-dimethyl-2,5-di(tert-butyl peroxy)-hexane (T-101), appeared to meet for the best grafting degree (1.91%). The grafting degree increased markedly by increasing the amounts of monomer IA and initiator T-101. The grafting degree also increased by increasing mixing temperature and time. The optimum monomer and initiator concentrations and reaction temperature and time were found to be about 5wt%/0.05wt% and
/15min, respectively. It was found that the physical properties of EPDM-g-IA were higher than those of the pristine EPDM.
Studies on Slip and Mechanical Properties of Thermoplastic Polyurethane Elastomer with Carboxylic acid and Nano zinc oxide
Shin, Hyun Deung ; Kim, Dong Ho ; Kim, Gu Ni ;
Elastomers and Composites, volume 49, issue 3, 2014, Pages 191~198
DOI : 10.7473/EC.2014.49.3.191
We synthesized thermoplastic polyurethane elastomer(TPU) with acid group and nano zinc oxide, and characterized their mechanical properties, thermal properties, contact angle and grip property. The effects of the zinc oxide content and size on the physical property of TPU were investigated. When the nano zinc oxide was introduced in TPU with acid group, it had excellent mechanical properties and grip by formation of hydrogen and ionic bonding. The wet slip of TPU with zinc oxide was increased continuously as ionization rate increased due to increase of hydrophilicity and ionic interaction, and mechanical properties were increased with increasing ionization rate up to 50%.
The Effect of Crosslinker Type on Adhesion Properties of Transparent Acrylic Pressure Sensitive Adhesives for Optical Applications
Baek, Seung-Suk ; Jang, Se-Jung ; Hwang, Seok-Ho ;
Elastomers and Composites, volume 49, issue 3, 2014, Pages 199~203
DOI : 10.7473/EC.2014.49.3.199
Terpolymer syrups were photopolymerized from 2-ethylhexyl acrylate, 2-hydroxylethyl acrylate and isobornyl acrylate to prepare acrylic pressure sensitive adhesives (PSAs). After polymerization, various crosslinkers as 1,6-hexanediol diacrylate (HDDA), poly (ethylene glycol) diacrylate (PEGDA, Mn = 250, 575, and 700) were added and then UV-irradiated to prepare the semi-IPN type PSAs. Their adhesion performance and storage modulus (G') were strongly dependent on their chemical structure and molecular weight of the crosslinkers. Optical properties such as transmittance (> 92.5 %), haze (< 1.0 %) and color-difference (< 0.3) of PSAs samples were not affected by crosslinker types used in this study.
Synergic Effect of Clay on the Mechanical and Electrical Properties of SWCNT/Epoxy Composites
Choi, Won Seok ; Ryu, Sung Hun ;
Elastomers and Composites, volume 49, issue 3, 2014, Pages 204~209
DOI : 10.7473/EC.2014.49.3.204
-MMT) was introduced into single wall carbon nanotube (SWCNT)/epoxy composite to investigate the effect of MMT size and MMT/SWCNT ratio on the mechanical and electrical properties of composite. Three different sizes of MMTs were used and all were found to function as effective dispersion aids for SWCNTs. Mechanical properties of SWCNT/epoxy composite increased with MMT content; tending to decrease once the MMT content reached a critical level. However, the surface electrical resistance decreased with increasing MMT content and tended to increase after the critical content was reached. Critical MMT/SWCNT ratio for maximum mechanical properties and minimum electrical resistivity was strongly dependent on the MMT size. Critical MMT/SWCNT ratio was decreased with MMT size.
Effect of Liquid Isoprene Rubber on the Adhesion Property of UV Curable Acrylic Pressure-Sensitive Adhesive
Lee, Jiye ; Chung, Kyungho ;
Elastomers and Composites, volume 49, issue 3, 2014, Pages 210~219
DOI : 10.7473/EC.2014.49.3.210
In this study, the acrylic pressure sensitive adhesive (PSA) for the optical functionality sheet was prepared by blending liquid isoprene rubber. The acrylic PSA was synthesized with butyl acrylate, acrylic acid, 2-ethylhexyl acrylate and 2-hydroxyethyl methacrylate. Toluene was used to a solvent for polymerization. Liquid isoprene rubber (LIR-50) was blended with the acrylic PSA and blend ratio was 0 ~ 50 wt%. According to the results, the adhesive transfer, which was the big problem of acrylic adhesive, was reduced with the addition of LIR-50. The secondary bonding of LIR-50 with substrate did not occurred due to absence of polar group in LIR-50. The peel strength and adhesive transfer were decreased by UV curing and the degreed of decrease depended on the amounts of photoinitiator and UV irradiation time. On the other hand holding power increased drastically by increasing amounts of photoinitiator and UV irradiation time.
Computer Simulation of Rubber Flow for Mold Profile in Rubber Shaping Process
Lee, Dan Bi ; Lee, Min A ; Choi, Sung Hyun ; Lyu, Min-Young ;
Elastomers and Composites, volume 49, issue 3, 2014, Pages 220~224
DOI : 10.7473/EC.2014.49.3.220
The tire tread is contacted with road surface directly. It gives significant effect on the breaking conditions, traction, noise and so on. The tread having grooves with complex geometry is molded by shaping process. The flow behavior of tread rubber in a mold affects the quality of the tread and it leads to the running performance of automobile. In this study, the flow behavior of rubber in shaping process has been investigated by computer simulation. The objective of flow simulation is the design of tread shape based on the contact of rubber on the mold surface and flow behavior of rubber. Different sequences of contact of rubber on the mold surface and flow behavior of rubber are observed according to the shape of tread on the mold surface. It was verified that the shape of tread gives significant effect on the flow behavior of rubber. Different flow behaviors of rubber and sequential contact of rubber to the mold surface were observed according to the shape of tread on the mold surface. Therefore, we have identified that the shape of tread give a change in the flow behavior of rubber.
Preparation of PP-g-IA and its Compatibilizing Effects in PP/EVOH Blends
Kim, Jung Soo ; Jang, Ji-Hoon ; Jeon, Dong-Gyu ; Kim, Dong Hyun ;
Elastomers and Composites, volume 49, issue 3, 2014, Pages 225~231
DOI : 10.7473/EC.2014.49.3.225
In this study, we used polypropylene grafted with itaconic acid (PP-g-IA) as a compatibilizer to prevent phase separation phenomenon which occurs upon blending polypropylene (PP) and ethylene-vinyl alcohol copolymer (EVOH). A compatibilizer was prepared using graft copolymerization of itaconic acid (IA) onto PP where input ratio of IA was 1, 2, 5, and 10 wt.%. To confirm the structure of PP-g-IA and the graft ratio of IA onto PP, we used
NMR and FT-IR. We tested the compatibilizer which has highest graft ratio of 1% in immiscible PP/EVOH blends. The morphologies of PP/PP-g-IA/EVOH blends were analyzed by SEM. Thermal and mechanical properties of the blends were analyzed by DSC and UTM. PP-g-IA enhanced the interfacial adhesion of PP and EVOH copolymer.
Preparation of Monodisperse Poly(Acrylic acid) with a Water-Soluble Initiator by Solution Polymerization in Aqueous Phase
Park, Moonsoo ; Kim, Yeji ;
Elastomers and Composites, volume 49, issue 3, 2014, Pages 232~238
DOI : 10.7473/EC.2014.49.3.232
Solution polymerization was conducted with water-soluble acrylic acid (AA) as a monomer and potassium persulfate (KPS) as an initiator at a selected temperature between
with water as a reaction medium. When the ratio between AA and water was reduced or initiator concentration increased, molecular weights decreased. An increase in the reaction temperature produced lower molecular weights. The polydispersity index was close to 1.5 in most of the reactions. An increase in the stirring speed up to 400 rpm led to a progressive increase in molecular weights. When the stirring speed reached 800 rpm, however, we found that both the number and weight average molecular weights decreased. The glass transition temperature was nearly independent of moelcular weights and determined to be between
Characterization and Formation of Chemical Bonds of Silica-Coupling Agent-Rubber
Ko, Eunah ; Choi, Sung-Seen ;
Elastomers and Composites, volume 49, issue 3, 2014, Pages 239~244
DOI : 10.7473/EC.2014.49.3.239
Reaction between silica and silane coupling agent without solvent was investigated using transmission mode Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TGA). Bis[3-(triethoxysilylpropyl) tetrasulfide] (TESPT) was used as a silane coupling agent. After removing the unreacted TESPT, formation of chemical bonds was analyzed using FTIR and content of reacted TESPT was determined using TGA. Content of the coupling agent bonded to silica increased with increase in the coupling agent content, but the oligomers were formed by condensation reaction between coupling agents when the coupling agent was used to excess. In order to identify bonds formed among silica, coupling agent, and rubber, a silica-coupling agent-BR model composite was prepared by reaction of the modified silica with liquid BR of low molecular weight and chemical bond formation of silica-coupling agent-BR was investigated. Unreacted rubber was removed with solvent and analysis was performed using FTIR and TGA. BR was reacted with the coupling agent of the modified silica to form chemical bonds. Polarity of silica surface was strikingly reduced and particle size of silica was increased by chemical bond formation of silica-coupling agent-BR.
Effect of PPG, MDI, 2-HEMA and butyl acrylate content on the properties of polyurethane adhesive
Park, Chan Young ;
Elastomers and Composites, volume 49, issue 3, 2014, Pages 245~252
DOI : 10.7473/EC.2014.49.3.245
FT-IR measurement and the physical properties of polyurethane adhesive prepared from the polyol, isocyanate, 2-HEMA and other acrylate monomers were examined. The softening point, viscosity, adhesion strength and mechanical properties of the PU adhesives were reviewed by Ring and Ball method, Brookfield viscometer and universal test machine, respectively. Results revealed that increment of both PPG amount and butyl acrylate content decreased softening point, adhesion strength, tensile strength and 100% modulus. However as 2-HEMA and MDI content increased the mechanical properties including tensile strength, 100% modulus increased, and also the viscosity and NCO content increased.