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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 37, Issue 3 - Sep 2002
Volume 37, Issue 2 - Jun 2002
Volume 37, Issue 1 - Mar 2002
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Mechanical Properties of PVC Complexes Using Waste-Gypsum (I)
Ho, Dong-Su ; Park, Young-Hoon ; Nah, Jae-Woon ; Choi, Chang-Yong ; Kim, Myung-Yul ;
Elastomers and Composites, volume 37, issue 1, 2002, Pages 7~13
In this study, mechanical properties of PVC complexes containing the gypsum (Namhae Chemical Co.) which contains phosphte, CaO, etc., Pb-species stabilizer, and
were investigated as a function or the content. As a result, mechanical properties increased when the gypsum was mixed with PVC at the extent of 8.46wt%. From this result, it is suggested that the gypsum containing phosphate and CaO is compatible with PVC. Thermogravimetric analysis(TGA) showed that pyrolysis started about at
, and residual weight(%) increased with the amount of the gypsum, and differential scanning calorimetry (DSC) showed that
had the maximum and minimum value respectively when the gypsum was mixed with PVC at the extent of 8.46wt%. Comparing all the results, both mechanical and thermal properties of PVC complex were improved. The X-ray diffraction measurement also showed their blonds and structures.
Influence of Mixing Procedure on Properties of Rubber Compounds Filled with Both Silica and Carbon Black
Joo, Chang-Whan ; Kim, Dong-Chul ; Choi, Sung-Seen ;
Elastomers and Composites, volume 37, issue 1, 2002, Pages 14~20
Silica-filled rubber compound needs longer mixing time compared to carbon black-filled one since it has poor dispersion or the filler. Influence of the mixing procedure on the properties of natural rubber compound filled with both silica and carbon black was studied. The discharge temperature of the master batch (MB) mixing was
. The mixing time was longer when silica and carbon black were loaded separately than when loaded simultaneously. The mixing time was longer when silica was loaded first than when carbon black is loaded first. The compounds prepared by one MB step (conventional mixing) were compared with the compounds prepared by two MB steps (two-step mixing). Scorch times of the two-step mixing compounds were longer than those by the conventional mixing ones. Bound rubber contents of the formers were lower than those of the tatters. The two-step mixing vulcanizates had longer elongation at break, higher tensile strength, and better fatigue life.
Preparation of Methyl methacrylate/styrene Core-shell Latex by Emulsion Polymerization
Kang, Don-O ; Lee, Nae-Woo ; Seul, Soo-Duk ; Lee, Sun-Ryong ;
Elastomers and Composites, volume 37, issue 1, 2002, Pages 21~30
Core-shell polymers of methyl methacrylate/styrene pair were prepared by sequential emulsion polymerization in the presence of sodium dodecyl benzene sulfonate(SDBS) as an emulsifier using ammonium persulfate(APS) as an initiator. The characteristics of these core-shell polymers were evaluated. Core-shell composite latex has the both properties of core and shell components in a particle, where as polymer blonds or copolymers show a combined properties from the physical properties or two homopolymers. This unique behavior of core-shell composite latex can be used in many industrial fields. However, in preparation of core-shell composite latex, several unexpected phenomina are observed, such as, particle coagulation, low degree of polymerization, and formation of new particles during shell polymerization. To solve the disadvantages, we studied the effects of surfactant concentrations, initiator concentrations, and reaction temperature on the tore-shell structure or PMMA/PSt and PSt/PMMA. Particle size and particle size distribution were measured by using particle size analyzer, and the morphology of the core-shell composite latex was observed by using transmission electron microscope. Glass transition temperature(
) was also measured by using differential scanning calorimeter. To identify the core-shell structure, pH of the composite latex solutions were measured.
Study for Reducement of Polymerization Time and Improvement of Stability in Manufacturing Carboxylated Styrene-butadiene Latex
Cho, Ur-Ryong ;
Elastomers and Composites, volume 37, issue 1, 2002, Pages 31~38
Polymerization of carboxylated styrene-butadiene latex takes longer time than that of acrylic emulsion due to delocalization of radical in butadiene unit having conjugated double bond. A latex stability is the most important properties owing to use intact without separating polymer from base latex. For reducing polymerization time without decreasing any properties of latex, carbon tetra-chloride which has been used as the most popular chain transfer agent was replaced to combination of tert-dodecylmercaptane and
-methylstyrene dimer. The replacement yielded reducement or 2 hr in polymerization time. In the increment step, charge amount of acrylic acid was limited to 0.3 part to restrain viscosity enhancement. Just after initial step, addition of 0.1 part acrylamide prevent polymer chain from diffusing between two region followed by giving hardness and final good adhesive force to latex particles.
Synthesis and Properties of Linear and Crosslinkable Polyurethane Elastomers
Choi, Sung-Ro ; Lee, Su-Min ; Kim, Hyun-Min ;
Elastomers and Composites, volume 37, issue 1, 2002, Pages 39~48
Linear and crosslinked polyurethane dispersions were synthesized with 2,4-toluene diisocyanate, dimethylol propionic acid, polyoxypropylene glycol and polyoxypropylene glycerin. The structures of these polyurethanes were characterized by
and FT-IR and the properties were measured with DSC, TGA, Instron and AFM etc. In case of linear polyurethane dispersion, the particle size, viscosity and glass transition temperature of polyurethanes increased with higher molecular weight of polyol and the degree of crosslinking. The crosslinked polyurethanes which contains more than 15% of polyoxypropyleneglycerin didn't from dispersion, when mixtures by polyoxypropyleneglycol and polyoxypropyleneglycerin were used as polyols. Thus, we synthesized crosslinked polyurethanes with 5%, 8%, 13% and 15% weight percents of polyoxypropylene glycerin as polyol mixtures.
Surface Composition Change of UV/Ozone Modified Polypropylene
Kim, J.I. ; Ryu, S.H. ;
Elastomers and Composites, volume 37, issue 1, 2002, Pages 49~56
Polypropylene is oxidized with UV/ozone as a function of UV treatment time and ozone flow rate and its surface characteristics are investigated using contart angle measurements and XPS. The aging behavior of oxidized surface is investigated under air, water and ethylene glycol as the aging media. Adhesion strength is also investigated using a lap shear test. Polar surface energy increases with increasing UV/ozone treatment time as well as ozone flow rate. No polar surface energy change is observed under water aging, while under air aging it decreases significantly within 2-3 days and reaches the close value as that of the untreated PP. Adhesion strength increases with increasing UV/ozone treatment time as well as ozone flow rate.