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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
Effects of Vulcanization Type end Temperature on Physical Properties of Natural Rubber Compounds
Rhee, John-M. ; Yoon, Chan-Ho ; Huh, Yang-Il ; Han, Seung-Cheol ; Nah, Chang-Woon ;
Elastomers and Composites, volume 35, issue 3, 2000, Pages 173~179
Cure characteristics. tensile properties, and dynamic properties were investigated on the carbon black-filled natural rubber compounds, in which three typical vulcanization types conventional vulcanization(Conv), semi-efficient(Semi-EV), and efficient(EV) vulcanizations were used. The effects of vulcanization temperature on both the mechanical property and aging resistance of rubber compounds were also investigated. The Conv cure system showed a slightly slower rate of vulcanization than those of Semi-EV and EV ones. On the other hand, it showed a higher value in the maximum torque of cure curve. Higher tensile moduli were observed in Conv system than those in Semi-EV and EV ones, while lower elongation at break were obtained in Conv one. The tensile strength at break were found to be about the same for three cute systems. Hardness, modulus, and tensile strength decreased with increasing the vulcanization temperature, and the degree of changes in the properties was found to be smaller for EV and Semi-EV systems than that in Conv one. The EV system was found to be superior in thermal-aging resistance to Conv one.
]-filled Rubber Composite
Park, Jong-Il ; Kang, Dong-Heon ; Kang, Suck-Choon ; Chung, Kyung-Ho ; Hong, Young-Keun ;
Elastomers and Composites, volume 35, issue 3, 2000, Pages 180~187
For the purpose of developing a new type of frictional material using scrap rubber in which rubber makes continuous phase, potassium titanate(
) was synthesized and added to rubber matrix. Needle-typed
powders were obtained through the flux method using KCI salt and excess
. It was also found that the powders should be surface-treated to enhance adhesion and 10 phr of epoxy be added for the physical properties of the rubber composite.
A Study on the Preparation of NBR/Polypyrrole Conducting Composites and Their Electrical Properties
Jung, Mi-Ok ; Huh, Yong-Il ; Lee, Wan-Jin ;
Elastomers and Composites, volume 35, issue 3, 2000, Pages 188~195
The conducting composites were prepared by emulsion polymerization with poly (acrylonitrile-co-butadiene) (NBR) as a matrix and polypyrrole (PPY) as a conducting polymer. Among several surfactants, the electrical conductivity of the composite which was polymerized by dodecyl sodium sulfate (DSS) was the best. The film of composite was prepared by compression molding. The electrical conductivity was measured by 4 probes method as a function of PPY and temperature. When the content of PPY was 25 wt%, the electrical conductivity of composite was increased up to 1.17 S/cm. The percolation threshold showed at the vicinity of 15 wt% PPY content.
The Physical Properties of Ethylene Vinylacetate Emulsion Mixed with SBR, Urethane, Epoxy and Acryl Latex
Suh, Won-Dong ;
Elastomers and Composites, volume 35, issue 3, 2000, Pages 196~204
SBR, polyurethane, acryl and epoxy latex were separately mixed with ethylene -vinylacetate emulsion(EVA) in the range of
. For the mixtures, the various physical properties such as defoamerability, mechanical property, and water resistance were experimentally examined. The excellent defoamer was BYK-021 and the appropriate use of it was 0.3 phr for the total components. The shrinkage of compounds was influenced by the compatability of resins and the formation of voids. The mechanical properties was related to the cohesive force of resin particles, the coagulation of cement particles and the co-bonding of resin particles with cement particles. Mixing latex separately showed better properties then non-mixing in the shrinkage ratio, flexural strength, adhesive strength, and impact strength. The water resistance of composites mixed with cement was worse than that of EVA resin.
A study on the Synthesis end Properties of Polyurethane Resin Based on PPG as a Glycol
Yoo, Kil-Sang ; Choi, Sang-Goo ;
Elastomers and Composites, volume 35, issue 3, 2000, Pages 205~214
The polyurethane resin was prepared by the reaction of tolylenediisocyanate(TDI) and polypropyleneglycol(PPG). Physical properties of the resin were investigated experimentally. Charging catalyst before TDI-dropping induced the rapid increase of viscosity. On the other hand, charging catalyst after TDI-dropping resulted in mild stability without immoderate generation of heat on reaction. The use of phosphoric acid as catalyst led to low viscosity by restraining side-reaction such as forming of branch-chain, buret reaction and allopanate reaction, but it showed low cross-link density and slow drying. The curing speed was more influenced by structures of molecules rather than NCO/OH ratio. Including PPG 400 over 30 wt % showed excellent adhesive strength due to increase of crosslink density.
Cure Characteristics of Carbon Block-Filled Rubber Compounds Composed of NR, SBR, and BR
Choi, Sung-Seen ;
Elastomers and Composites, volume 35, issue 3, 2000, Pages 215~226
Cure characteristics of carbon black-filled rubber compounds with different rubber composition were studied using a rheometer. The carbon black-filled rubber compounds with single, binary, and ternary rubber compositions of natural rubber (NR), styrene-butadiene rubber (SBR), and butadiene rubber (BR) were used. Delta-torques of the NR/BR- and SBR/BR-based compounds with a high BR content were higher than those of the single rubber-based compounds. For ternary rubber-based compounds, the delta-torques of the compounds were lower when the difference in the rubber content ratios was small than when it was big. Scorch and optimum cure times of the rubber compounds became shorter by increasing the content of NR in the compounds while those became longer by increasing the SBR content. Cure rates of the rubber compounds increased with a decrease of the SBR content in the rubber compounds. Reversion ratios decreased with an increase of the SBR content in the rubber compounds.
Studies on Recycling of Waste Polyurethane ( II )
Lee, Hyung-Kyu ; Hwang, Sung-Hyuk ; Kim, Jin-Kuk ;
Elastomers and Composites, volume 35, issue 3, 2000, Pages 227~235
This study focused on the recycling technology and application of waste polyurethane scrap(
) and waste urethane form from the footware scrap. Firstly we suggest the waste polyurethane can be used as a component of medium for hydroponic rose culture. Secondly, recycled thermoplastic polyurethane(RTPU) was produced and blended it with high impact polystyrene(HIPS). And also, in order to extend application of recycling field, the former was produced with adding the amine foaming agent to RTPU/HIPS alloy. The main purpose of this study is to diverse of the recycling of the waste polyurethane.