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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 33, Issue 5 - Dec 1998
Volume 33, Issue 4 - Oct 1998
Volume 33, Issue 3 - Jul 1998
Volume 33, Issue 2 - May 1998
Volume 33, Issue 1 - Mar 1998
Selecting the target year
Studies on the Physical Properties of Synthetic Rubber Blends Containing Rein-forcing Fillers
Go, Jin-Hwan ; Lee, Seog ;
Elastomers and Composites, volume 33, issue 4, 1998, Pages 231~237
In order to investigate the physical properties of rubber blend compound, this experiment was carried out on the cure rate, loss tangent, reinforcement and abrasion properties of S-SBR (solution styrene-butadiene rubber) blends containing silane coupled silica and E-SBR (emulsion styrene-butadiene rubber) blends containing carbon black as a model compound. E-SBR blend showed the highest total bound rubber(TBR), while S-SBR blends showed constant TBR level regardless of rubber type. Rapid cure rate was achieved when the styrene and vinyl content of rubber microstructure decreased and TBR content of rubber compounds increased. The modulus as the index of rubber reinforcement showed the linear relation with TBR content. The large amount of PICO loss was observed when the styrene and vinyl content of rubber microstructure increased, while the small amount of PICO loss was observed when the ratio of bu-tadiene increased in the S-SBR blends with silane copuled silica. The high loss tangent at
, the low loss tangent at
, and the large difference of loss tangent were shown in the S-SBR blends with high styrene content compared to E-SBR blend.
Electrical Degradation Properties of EPR Cable Partially Irradiated by
Lee, Sung-Ill ;
Elastomers and Composites, volume 33, issue 4, 1998, Pages 238~245
In this paper, the electric property was investigated for insulation diagnosis of radiation of EPR electric power cables by partially irradiation with
rays. As the rate of radiation increased from 100Mrad to 200Mrad, charging current and discharging current were increased from
(A). In addition, we found charging current and discharging current of cables subjected to 50% and 16.7% irradiation changed the length of the part 1/2 to 1/6 as in comparison with cables degraded by 100% irradiation. For 22m and 66m of cables which had not been degraded yet, we realized the value of charging current and discharging current of 66m cables is three times higher than 22m cables. From these results, it is demonstrated that the possibility of utilizing charging current and discharging current as the diagnosis method of insulation degradation with irradiating EPR cables by
Electrical Conduction and Resistance Characteristics of Styrene Butadiene Rubber (SBR) Composites Containing Carbon Black
Kim, Do-Hyun ; Lee, Jung-Hee ; Sohn, Ho-Soung ; Lee, Kyung-Won ;
Elastomers and Composites, volume 33, issue 4, 1998, Pages 246~254
In order to investigate the characteristics of resistance and conduction of vulcanized styrene butadiene rubber (SBR)/ carbon black (CB) composites, surface/ volume resistivity, point to point resistance, decay time, and electrical conduction experiments with four different kinds of non-conductive carbon black were measured. When about 50phr of carbon black were loaded in SBR, all resistivites suddenly decreased and critical region (Rc) was shown. Current densities of SBR/CB composites showed critical point (Pc) and increased with the electric fields. Electrical conduction mechanisms of SBR/CB composites could be considered as the ohmic conduction at low electric fields and the space charge limited conduction (SCLC) at high electric fields, respectively.
Continuous Polymerization and In-Situ Blends of Lauryl lactam-EPDM
Kye, Hyoung-San ;
Elastomers and Composites, volume 33, issue 4, 1998, Pages 255~266
One-step continuous reactive blend with EPDM is investigated using a modular intermeshing corotating twin screw extruder This was performed via anionic polymerization mechanism. Mechanical properties were characterized and compared with mechanical blends.
Adhesion Properties of Moisture-Curable Polyurethane Hotmelt
Kim, Jae-Beum ; Chung, Kyung-Ho ; Chun, Young-Sik ; Jung, Jin-Soo ; Chang, Young-Wook ;
Elastomers and Composites, volume 33, issue 4, 1998, Pages 267~273
Isocyante terminated urethane prepolymers were synthesized by the reaction of 4,4'-dimethyl phenyldiisocyanate(MDI) and ester type polyols such as ethylene glycol/ butanediol adipate(EBA), neopentylglycol/butanediol adipate (NBA) and hexanediol adipate (HA) . All of the NCO-terminated urethane prepolymers are solid at room temperature, but they become mobile enough to be disposed onto a substrate upon heating about
. Subsequently, they are solidified and cured through the reaction with moisture. Tensile behavior of the ore-thane hotmelt exhibits characteristic features depending on the type of polyol. The adhesive strength determined by single lap shear joint is higher in order of HA, NBA and EBA based ore thane hotmelt, which can be correlated with the magnitude of breaking energy of the cured films. The failure mode are cohesive for all cases and the adhesive strength increases as the test is performed faster. This indicates that the strength of the adhesive joint is primarily dependent upon the bulk properties of the adhesives.
A Study on the Vulcanization Characteristics of SBR/BR Blends Containing Reinforcing Fillers
Lee, Seag ;
Elastomers and Composites, volume 33, issue 4, 1998, Pages 274~280
Order of reaction, rate constant, activation energy for vulcanization reaction, crosslinking density, and elastic constant of the network produced by sulfur curing were investigated on the SBR/BR blends containing silica and carbon black under same cure system. The reaction order was shown to be first order regardless of filler types. The carbon black filled rubber compounds showed higher rate constant compared to silica filled compounds. But activation energy appeared to be same regardless of filler type and rubber blend ratio. The crosslinking density and elastic constant is higher in the carbon black filled compound compared to silica filled compounds because of strong interaction between rubber and carbon black. On the other hand, crosslinking density and elastic constant were decreased with increasing the butadine rubber content in rubber blends. From the comparison of combined sulfur content in the vulcanized rubber, sulfur content in the silica filled compound become constant 20min later after reaction initiates but sulfur content in the carbon black filled compound become constant 10min later after reaction starts. The silica compound has a longer induction time (
) and optimum cure time(
) compared to those of the carbon black filled compound.
A Study of the Effect of Degree of Cure on the Physical Properties of Rubber Compounds
Kim, Hyeon-Jae ; Kaang, Shin-Young ; Nah, Chang-Woon ;
Elastomers and Composites, volume 33, issue 4, 1998, Pages 281~289
Tensile properties including Young's modulus and tear strength were measured for four different rubber compounds; natural rubber(NR), styrene-butadiene copolymer(SBR), ethylene-propylene diene monomer (EPDM), and brominated isobutylene-p-methyl-styrene copolymer(BIMS) as a function of temperature and degree of cure. To see the effect of over cure, a measurement was made of the tensile strength and swelling behavior of the over-cured rubber compounds. Young's modulus, E, was found to have linear dependency on the degree of cure for all rubber compounds. EPDM and BIMS showed the highest and lowest slopes, respectively. The slope of NR and SBR lay between EPDM and BIMS. Tear strength, Gc, decreased in the order of NR>BIMS>SBR>EPDM. As the cure time was extended the degree of cure of NR and SBR decreased, while that of BIMS increased. EPDM showed little change in the degree of cure.
Study on an Elastic and Permeable Pavement using Scrap Tire
Um, Jun-Gil ; Chung, Kyung-Ho ; Choo, Kang ; Hong, Young-Keun ;
Elastomers and Composites, volume 33, issue 4, 1998, Pages 290~296
Recycling of waste tire has been limited and very simple, few applications have been observed. This study introduces a new elastic and permeable pavement made of scrap tire. Experimental results showed that key factors affecting the compressive strength were the size of scrap tire, size of aggregate, amounts and property of binder. Also, the water permeability depended on the size of aggregate and scrap tire. The compressive strength and water permeability of the samples were 1.4 and 116 times higher than those of the conventional porous cement concrete, respectively.