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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 35, Issue 4 - Dec 2000
Volume 35, Issue 3 - Sep 2000
Volume 35, Issue 2 - Jun 2000
Volume 35, Issue 1 - Mar 2000
Selecting the target year
Characterization of NR Vulcanizates Cured by Both Sulfur and Resole
Choi, Sung-Seen ;
Elastomers and Composites, volume 35, issue 4, 2000, Pages 261~271
Physical properties of NR vulcanizates cured by both sulfur and resole were studied. Cure characteristics of the compounds were also investigated. Two types of resoles with different molecular weight distributions were employed. The scorch time of the NR compound containing the resole with a low molecular weight distribution was shorter than that of the compound containing the resole with a high one. Crosslink densities of the NR vulcanizates with a high resole content after the thermal aging at
decreased, while that of the vulcanizate without resole after the thermal aging at
increased. Though crosslink densities of the NR vulcanizates with a high resole content decreased with increasing the aging time, the moduli increased while the tensile strength and tear strength decreased.
Analysis of Environmental Process for Commercial Rubbers using Thermal Degradation
Kim, Won-Il ; Lee, Seung-Bum ; Hong, In-Kwon ;
Elastomers and Composites, volume 35, issue 4, 2000, Pages 272~280
The experimental kinetics was analyzed for commercial rubbers such as NR, IR, BR, SBR 1500, and SBR 1700. Kinetic analysis for the commercial rubbers was performed using a thermogravimetric method, which the activation energies of NR obtained by Kissinger, Friedman, ana Ozawa's method were 195.0, 198.3, and 186.3 kJ/mol, respectively. whereas that of SBR 1500 were 246.4, 247.5, and 254.8 kJ/mol, respectively. It was shown that the yield of pyrolytic oil was generally increased with increasing the final temperature. Considering the effect of heating rate. it was found that the yield of pyrolytic oil was not consistent for each sample. The number average molecular weight of pyrolitic oil of SBR 1500 was in the range of 740-2486. The calorific value of SBR 1500 was 39-40 kJ/g, and it might be a considerable energy potential although it was lower than the conventional fuel such as kerosene, diesel, light fuel, and heavy fuel.
Synthesis and Physical Properties of Waterborne Polyurethane Microgels
Kim, Kong-Soo ; Kim, Tae-Kyung ; Oh, Geul-Jung ; Kim, Sang-Ki ;
Elastomers and Composites, volume 35, issue 4, 2000, Pages 281~287
Waterborne polyurethane(PU) microgel dispersions were synthesized with different mole ratio of polytetramethylene glycol(PTMG) to dimethylol propionic acid(DMPA). Particle size distribution, thermal and mechanical properties of the PU microgels were investigated. Particle size of the microgels was distributed in the range of
and decreased with increasing the mole ratio of DMPA and 1,2,6-hexanetriol. Glass transition temperature and melting temperature of the microgels were in the range of
respectively. Tensile strength and elongation of the PU microgel films were maximum in the case of 60/40 mole ratio of PTMG/DMPA.
Devulcanization of Vulcanized EPDM Rubber by a Chemical Method
Moon, Jae-Ho ; Kim, Yang-Soo ;
Elastomers and Composites, volume 35, issue 4, 2000, Pages 288~295
It has been tried to decrease the crosslink density of vulcanized EPDM (ethylone-propylene-diene terpolymer) rubber through a chemical devulcanization treatment. Phase transfer catalyst, alkali metal (i.e., sodium), and triphenylphosphine have been used as a chemical agent ul the devulcanization treatment. Also it has been estimated the effect of the devulcanization treatment in the case of utilization of 2-butanol as a devulcanization reaction solvent. In the devulcanization treatment using quaternary ammonium salt as a phase transfer catalyst. the devulcanization effect has been studied with the variation of catalyst molecular weight and the choice of bromide or chloride cation. In the devulcanization treatment using sodium, it has been estimated the devulcanization treatment effect depending upon the variation of reaction variables such as amount of sodium used, reaction temperature, pressure of hydrogen gas, which is used as a reaction environment. The
value (number average molecular weight between two crosslink points) has been experimentally estimated by the equilibrium swelling method and it is quantitatively related to the crosslink density. The estimation of devulcanization effect for vulcanized EPDM rubber has been carried out by the comparison of the
values between the untreated and the treated specimens.
The Effect of Low Temperature Plasma Treatment Condition on the Peel Strength of EVA Foam for Shoe Mid-sole
Park, C.C. ; Park, C.Y. ;
Elastomers and Composites, volume 35, issue 4, 2000, Pages 296~302
The surfaces of injection and pressure-molded sheets of poly(ethylene-covulylacetate)(EVA) foams used for shoe mid-sole were treated with low temperature plasma to improve adhesion with a water-based polyurethane adhesives. Several experimental variables were considered, such as radio frequency power, treating time, type of gas. gas flow, and distance between electrode and sample. The modificated surface by plasma treatment were characterized using contact angle meter, scanning electron microscopy(SEM), universal testing machine(UTM). Adhesion was tested by T-peel tests of treated EVA foams/polyurethane adhesive joints. The treatment in the low temperature plasma produced a noticeable decrease in contact angle. The peel strength of EVA foams treated with plasma was increased with plasma treating time, and gas flow.
A Study on the Low Temperature Retraction of NR
Yun, Jun-Ho ; Kim, Tae-Ho ;
Elastomers and Composites, volume 35, issue 4, 2000, Pages 303~310
Low temperature retraction characteristics were investigated on the cured natural rubber with various ratios of crosslinking agents, filler and additives. The cured natural rubber product was elongated about 200% at
for 24 hours and then retracted. In a definite range, the retraction was increased as the sulfur to accelerator ratio increased and as the filler contents decreased. The retraction was maximum for a definite range of amount of accelerators, plasticizer and activator. Adding some peroxide additively retraction characteristics improved and curing time got longer.