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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
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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
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Computer Simulation of Deformation Behavior of the Rubber Diaphragm
Cho, Seong-Do-Seong ; Kim, Wan-Doo ;
Elastomers and Composites, volume 35, issue 1, 2000, Pages 4~11
A rubber diaphragm is a critical element of accumulators. The material of a diaphragm is nitrile rubber so as to recover and adjust the large deformation under external pressure fluctuation. The performance of accumulators is influenced by the deformation behaviors of the diaphragm. A large deformation behavior of the diaphragm has been investigated using the commercial finite element program MARC K7.1. The several elastic moduli have been used in linear analysis and Ogden's coefficients have been used in non-linear analysis. As a result, it has been shown that the deformation behavior with a elastic modulus of
is similar to the behavior of non-linear analysis. And, the modified diaphragm shape to reduce the stress concentration has been proposed.
A Study on the Mechanical Properties of Water Soluble Curing Agent and Epoxy Resins
Kim, Yong-Ho ; Lee, Kwang-Won ; Kwak, Young-Chae ;
Elastomers and Composites, volume 35, issue 1, 2000, Pages 12~18
With growing concerns of environment and due to strengthening the government regulations on volatile organic compounds(VOC) the coatings industries are developing new technologies to reduce the amount of VOC released from coatings. In this study. a water soluble curing agent of amino-epoxy adduct was synthesized and its structure was identified by FT-IR, GPC and TG/DTA. The mechanical properties of the new curing agent in combination of KER-828 and KER-500 were investigated respectively. As an experimental result, the drying time of KER-828 was faster than that of KER-500 but the adhesion and impact strength of KER-500 was better than that of KER-828.
Fundamental Study for Developing Silicone Rubber Impression Material
Oh, Young-Il ; Han, Kyung-A ; Kim, Kyung-Nam ; Cho, Lee-Ra ; Chung, Kyung-Ho ;
Elastomers and Composites, volume 35, issue 1, 2000, Pages 19~28
The fundamental study of additional silicone impression material has been performed by comparing the other import products. In order to estimate the possibility of usage of the impression material developed in this study, the several techniques such as IR, EDX, DSC, TGA, rubber rheometer, and contact angle measurement were used. According to the results, there were not any product satisfying all properties required in the impression material. The impression material developed in this study showed best mechanical properties among the all impression materials. However. the wetting property should be studied more by an introduction of a hydrophilic surfactant or modification of a base polymer.
Computer Simulation Studies of the Conformations of Polymeric Systems Near Surfaces as a Basic Research of the Elastomer
Kim, Myung-Yul ; Park, Yung-Hoon ;
Elastomers and Composites, volume 35, issue 1, 2000, Pages 29~37
In this study as a basic research of the elastomer, we show the results of the behavior of the two different chain length polymers in the melt confined between two impenetrable planes. The cubic lattice simulations are conducted in the canonical ensemble with a method that is a combination of reptation and crackshaft bond flip motions. A total of 680 chains which are 544 short chains comprising 10 beads and 136 long chains comprising 160 beads were placed in 20 lattice layers. It was assumed that there is no energetic interactions between covalently connected beads. while all other neighbors will interact with a truncated 6-12 Lennard-Jones potential. From the analysis of the simulation results, it was shown that purely entropic effects caused the shorter chains to partition preferentially to the surface. We also showed that the center of mass density of the shorter chains shows maximum near the surface. This is the opposite phenomena when compared to that of the longer chains. However, the segments of the shorter and the longer chains did not display any significant changes in bond order.
Migration Behaviors of Antiozonants in Triblend Vulcanizates of NR, SBR, and BR
Choi, Sung-Seen ;
Elastomers and Composites, volume 35, issue 1, 2000, Pages 38~45
Influence of rubber composition on migration of antiozonants to the surface in ternary rubber-based vulcanizates composed of natural rubber (NR) styrene-butadiene rubber (SBR), and butadiene rubber (BR) was studied. Of the three rubbers, contents of two rudders were same and only the other one content was different (variable rubber) IPPD and HPPD were employed as antiozonants. Migration experiments were performed at
for 21 days and outdoors for 4 months. Migration rates of the antiozonants increase by increasing the content ratio of the variable rubber in the vulcanizares from NR/SBR/BR=1/1/0.2 to 1/1/1 and then decrease with an increase of the content ratio of the variable rudder from 1/1/1 to 1/1/5. Migration behaviors of the antiozonants in the ternary rudder-based vulcanizates depending on the rubber composition were explained by the intermolecular interactions between rubber and antiozonant, by the solubility difference of the antiozonants for the rubbers, and by the interface formed between dissimilar rubbers in the triblends.
Miscibility Improvement in PP and EPDM Blends via Introducing Specific Interaction
Cho, Young-Wook ; Go, Jin-Hwan ; Lee, Won-Ki ; Lee, Jin-Kook ; Cho, Won-Jei ; Ha, Chang-Sik ;
Elastomers and Composites, volume 35, issue 1, 2000, Pages 46~52
Miscibility improvement between polypropylene(PP) and ethylene-propylene-diene-terpolymer (EPDM) was studied by introducing specific interaction into both polymers. PP was modified by grafting maleic anhydride(MAH) onto backbone, leading to MAH-grafted PP(PP-g-MAH). Sulfonated EPDM ionomer neutralized with bivalent zinc cation(ZnSEPDM) was used as one component. The blends of PP-g-MAH and ZnSEPDM were prepared at
in Brabender Roller Mixer. Fourier transform-infrared(FT-IR) spectroscopic and dynamic mechanical studies have been performed to investigate the miscibility. FT-IR spectral peak corresponding to carbonyl group in PP-g-MAH and that to sulfonate group in ZnSEPDM were shifted to lower and higher frequency with increasing ZnSEPDM content, respectively, in the blends. Glass transition temperature of ZnSEPDM was increased up to 70wt.% of ZnSEPDM, and again decreased above 70wt.%. It can be concluded from the shift of FT-IR characteristic peaks and the changes of glass transition temperatures that the miscibility between PP and EPDM was improved via introducing specific interaction, i.e., dipole-ion interaction.
Surface Modification of Steel Tire Cords via Plasma Etching and Plasma Polymer Coating : Part I. Adhesive properties
Kang, H.M. ; Chung, K.H. ; Kaang, S. ; Yoon, T.H. ;
Elastomers and Composites, volume 35, issue 1, 2000, Pages 53~62
Zinc plated steel tire cords were treated with RF plasma polymerization coating of acetylene or butadiene in order to enhance adhesion to rubber compounds. Plasma polymerization was carried out as a function of plasma power, treatment tune and gas pressure. In order to maximize adhesion, argon plasma etching was performed, with carrier gas such as argon, nitrogen and oxygen, while the adhesion of tire cords was evaluated via TCAT. Best results were obtained from a combination treatment of argon etching (90 W. 10 min, 30 mTorr) and acetylene plasma polymerization coating (10 W, 30 sec, 30 mTorr) with argon carrier gas (25/5:acetylene/argon). These samples exhibited a pull out force of 285N which is comparable to that obtained from the brass plated tire cords (290N).
Surface Modification of Steel Tire Cords via Plasma Etching and Plasma Polymerization Coating : Part II. Characterization
Kang, H.M. ; Chung, K.H. ; Kaang, S. ; Yoon, T.H. ;
Elastomers and Composites, volume 35, issue 1, 2000, Pages 63~70
Zinc plated steel tire cords were subjected to RF plasma etching of argon, followed by plasma polymerization coating of acetylene or butadiene in order to enhance adhesion to rubber compounds. Plasma polymerization was carried out under optimized conditions of 10 W, 30 sec, 30 mTorr for acetylene and butadiene gas, while plasma etching was performed at 90W, 10min and 30mTorr. The adhesion of tire cords was evaluated via Tire Cords Adhesion Test (TCAT) and the failure surfaces of the tested samples were analyzed by SEM. Polymer coating by plasma polymerization was also characterized by FT-IR, Alpha-Step and dynamic contact angle analyzer in order to elucidate the adhesion mechanism.