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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 36, Issue 4 - Dec 2001
Volume 36, Issue 3 - Sep 2001
Volume 36, Issue 2 - Jun 2001
Volume 36, Issue 1 - Mar 2001
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Preparation and Characterization of Removal-type Acrylic Pressure-Sensitive Adhesive
Seo, Young-Ok ; Seul, Soo-Duk ;
Elastomers and Composites, volume 36, issue 4, 2001, Pages 225~236
In order to improve the properties of the copolymer and the terpolymer that was used as removal-type pressure sensitive adhesive(PSA), we synthesized quaterpolymer with the variation of the types of monomer, initiator, and solvent, and concentration, the monomer/solvent ratio, reaction temperature and time. and determined the properties of this adhesive: the viscosity, molecular weight, conversion, solid content and structure of polymer. The prepared polymer was crosslinked by changing the type of crosslinking agent and concentration, and then we investigated the characteristics or adhesive such as peel adhesion, shear adhesion, heat resistance, weathering resistance and peel adhesion to aging. The optimum performance of RA/2- EHA/MMA/2-HEMA as a PSA were obtained when benzoyl peroxide was used as an initiator with the reactant mixture consisted of 80% BA and 2-EHA, 15%, MMA, and 5% 2-HFMA. The optimum reaction temperature and time were
and 8 hours, respectively. For BA/2-EHA/MMA/AA, the optimum performance was obtained when the polymerization was performed at the monomer composition of 80% BA/2-EHA, 15% MMA, and 5% AA. BPO was used as initiator and the optimum reaction temperature and time were identical to those of BA/2-EHA/MMA/ 2-HEMA. Isocyanate and melamine were used to crosslink BA/2-EHA/MMA/2-HEMA and BA/2-EHA/MMA/AA, respectively. No effect on the type of cross-linking agent on the peel adhesion was observed with aging. The quarterpolymers crosslinked with melamine left residues on the counter surface after weathering resistance test, while the polymers crosslinked with isocyanate did not.
Influence of Silane Coupling Agent Treatments on Physical Properties of Rubbery Materials
Woon, Jin-Bok ;
Elastomers and Composites, volume 36, issue 4, 2001, Pages 237~245
A study was made on the chemical treatment of silica and silane coupling agents, bistriethox ysilylpropyltetrasulfide(Si 69) and
-mercaptopropyltrimethoxy silane (MPS) for reinforcement of silica formulation. The effects of chemical treatment method and the most popular two coupling agents were examined. The results clearly indicate that the wet method, coupling agent is combined chemically with the silica prior to mixing, has more dispersion, wetting ability, dynamic properties and stability than the dry method, coupling agent is premixed directly with the silica. The mixing was done using a bench-type kneader having two mixing cam and a two-roll mill, under approximately similar conditions. The physical properties of SBR vulcanizates give rise to marked improvements by addition of Si 69 and MPS in comparison with without silane coupling agents. The optimum amount of Si 69 and MPS was 2 w/w% by experiments in the dry method but was 4 w/w% by EA and TGA analysis in the wet method.
Stabilization of Chlorosulfonated Polyethylene (CSM) Rubber Emulsion with Surfactant Mixture
Lee, Eun-Kyoung ; Choi, Seo-Young ; Park, Soo-Jin ;
Elastomers and Composites, volume 36, issue 4, 2001, Pages 246~254
In this work, the stabilization of chlorosulfonated polyethylene (CSM) rubber emulsion with surfactants, i.e., nonionic (Span 60) or anionic (Sodium laurylsulfate, SLS) surfactants, was investigated. The phase inversion emulsification by interfacial chemical characteristics was used to emulsify the CSM rubber. As a result, the emulsion phase separation was observed in the case of any single surfactant. However, there was no phase separation in the mixture of Span 60 and SLS in the context of emulsion droplet size tests and rheological behaviors. The droplet size decreases by increasing the surfactant mixture, resulting in increasing the viscosity. The viscosity and shear stress determined from shear rate show a shear thinning and yield behaviors. It was then found that the emulsion stabilization can be improved using the phase inversion emulsification method and surfactant mixture.
Temperature Effect on Tensile Strength of Filled Natural Rubber Vulcanizates
Ko, Young-Chon ; Park, Byung-Ho ;
Elastomers and Composites, volume 36, issue 4, 2001, Pages 255~261
This study was related with the effect of elevated temperature on the tensile strength of edge-cut samples. There was a different tensile strength behavior of uncut samples and pre-cut samples under different test temperatures. Tensile strength of uncut sample decreases with increasing test temperature. When pro-cut size(C) is larger than critical cut size(
), tensile strength or pre-cut specimen at
is higher than that of pre-cut specimen at room temperature (RT). Test specimens under
condition exhibited more secondary cracks at the crack tip region compared to room temperature conditions. However, secondary cracks of pre-cut specimens are not clearly developed at
. Differences in tensile strength induced by different test temperature seem to be responsible for the strain-induced crystallization and micro-cracking patterns.
Preparation and Properties of Insulating Rubber Gloves for Safety Protection
Kim, Kong-Soo ; Cho, Suk-Hyung ; Kim, Sang-Ki ;
Elastomers and Composites, volume 36, issue 4, 2001, Pages 262~267
Insulating rubber gloves with antibacterial and withstand voltage properties were prepared by blending the natural rubber latex(NRL), waterborne polyurethane(PU) and 4N-chitosan. Tensile strength of rubber glove increased with increasing amount of PU, and elongation decreased. The property of withstand voltage of rubber gloves improved with increasing leaching time, and the rubber gloves showed insulating capability of 10000V at leaching time of 3 hours. Little bacteria existed after 4N-chitosan was added to rubber gloves.
A Study on the Properties of Two-Component Type Polyurethane Resins Mixing Polyol and 4,4'-diphenyl Methane Diisocynate
Lee, Bum-Chuli ; Choi, Sang-Goo ;
Elastomers and Composites, volume 36, issue 4, 2001, Pages 268~277
The MDI(4,4'-diphenyl methane diisocyanate) was mixed with PPG, PEG and trimethylolpropane(TMP) respectively to prepare polyurethane resin. The various physical properties were measured for the mixtures. The gel-time was shortened by adding of PEG and TMP The molecular weight made a greater influence on the gel-time than the number of functional groups. The NCO-OH reaction was more active and faster than the NCO-NCO reaction. The hardness was influenced by crosslinking-density and molecular structure. The NCO-OH reactions yielded the flexible films and the NCO-NCO reactions yielded the brittle films. The increase of crystallinity and shrinkage induced the low adhesion ratio but the adding of TMP induced the high adhesion ratio. The flame-retardancy was influenced by quantity and kinds of flame-retardant. IXOL B-251 was the most excellent among the flame-retardants employed in this study. TCCP was partially separated because of the lack of solubility.