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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
The Study on the Dependence of Cure Condition for Reinforcing Filler
Lee, Seag ;
Elastomers and Composites, volume 33, issue 2, 1998, Pages 75~82
The purpose of this experimental study was to investigate the effects of vulcanization condition on the properties of reinforced rubbers. Rubber reinforcing ability of carbon black was more efficient than other fillers, but tensile properties were not affected by vulcanization condition while vulcanization condition affected the physical properties of rubber compounds with silica and silane treated slica. It was found that silica and silane treated silica filled rubber compounds showed good dynamic properties, rebound, heat build-up, 0 and
compared with carbon black filled rubber compounds. Carbon black filled rubber compounds were higher than silica and silane treated silica filled rubber compounds in total crosslinking density by vulcanization condition. By analysis of crosslinking type, polysulfide crosslinking was the highest in the carbon black filled rubber compounds with decreasing the ratio of sulfur to accelerator, monosulfide crosslinking was the highest in the silane treated silica filled compounds with in-creasing the ratio of sulfur to accelerator.
A Study on the Viscous Properties of Polyvinyl Acetate Emulsion Mixed with SBR, Polyurethane and Epoxy Latex
Choi, Sang-Goo ; Suh, Won-Dong ; Park, In-Suk ;
Elastomers and Composites, volume 33, issue 2, 1998, Pages 83~92
SBR latex, polyurethane latex and epoxy latex were mixed with polyvinyl acetate emulsion in 0~15% (wt.%). For the mixtures, the viscous properties were examined. The viscosity was influenced by the dispersed phase and the chain structures of polymer, and decreased with the rising of temperatures. The viscosity was increased with mixing of epoxy latex, but decreased with addition of SBR latex or polyurethane latex. Thixotropic index was influenced on the size of micelle and hydrogen bond. The thixotropic index was increased with mixing of epoxy latex or polyurethane latex within 5%, but keep up equality over that. The thixotropic index was decreased with mixing of SBR latex within 5%, but keep up equality over that. The relative viscosity were influenced on the activity of molecule and the interference of dispersed phases, was increased with the rising of temperatures. The relative viscosity was decreased with mixing of epoxy latex, but increased with mixing of SBR latex or polyurethane latex.
Optimum Curing and Full-out Velocity in the Rubber Extrusion Process for Electric Cable Manufacture
Kim, Duk-Joon ; Choi, Sang-Soon ; Kim, Tae-Ho ;
Elastomers and Composites, volume 33, issue 2, 1998, Pages 93~102
In electric cable industries, the curing extent of the rubber materials covering the electric cores gives an significant effect on their final performance. The curing extent of rubber is controlled mostly by pull-out velocity of cable in the extrusion process. The final curing extent may be different for different radial positions inside the rubber because of the non-uniform temperature distributions during the curing process. In this contribution, the prediction of curing extent distribution throughout the radial direction of rubber is represented when the cable is passing through the steam curing zone with a fixed pull-out velocity. The prediction of the optimum pull-out velocity for the desired curing extent distribution is also reported. The steady-state heat balance was developed for the curing and cooling processes in which the pull-out rubber was cured by high temperature steam and then cooled by ambient water. A few essential material properties such as density, specific heat, and thermal conductivity were measured to analyze the temperature distribution during the curing and cooling processes. The times to reach 90% curing extent at varying temperatures were measured and used to determine the final cure extent distribution inside the rubber.
Post-operating Techniques for Non-toping Vulconization Process of Electric Cable Sheath in Autoclave
Kim, Duk-Joon ; Choi, Sang-Soon ; Kim, Tae-Ho ;
Elastomers and Composites, volume 33, issue 2, 1998, Pages 103~109
The determination method of successful operation conditions to control the temperature and pressure in autoclave after non-taping vulcanization process was represented. Heat and mass balances were constructed to predict the mass flow rates of air, steam, and condensed water into or from autoclave when the temperature and pressure in the autoclave were to be controlled in the desired profiles. The balance equations were solved by appropriate mathematics, and the solution was applied to an autoclave system where the temperature and pressure were linearly decreased. The resulting solutions were illustrated in graphs.
Polydispersity and Particle Size Distribution of Polystyrene Latex Prepared by Ultrasound Induced Emulsion Polymerization
Kim, Won-Il ; Hong, In-Kwon ;
Elastomers and Composites, volume 33, issue 2, 1998, Pages 110~116
A new technology was introduced to the emulsion polymerization. It is the ultrasonic activation method which replaced a chemical initiator and the environmentally benign process. In this study, free radicals were produced by a pulse type ultrasound energy irradiation, then polystyrene latex was polymerized without chemical initiator. With ultrasonic energy density, the degree of polymerization, average molecular weight, and particle size were increased, but the polydispersity index for the molecular weight and the particle size were decreased. The optimum condition of emulsifier concentration and temperature was found to be 1.0 wt.% SDS and
, respectively. As a result, the emulsion polymerization process without chemical initiator was proved to be comparable to common latex properties such as average molecular weight, molecular weight distribution, particle size, etc.