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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
The Polymer Society of Korea
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Volume & Issues
Volume 34, Issue 6 - Nov 2010
Volume 34, Issue 5 - Sep 2010
Volume 34, Issue 4 - Jul 2010
Volume 34, Issue 3 - May 2010
Volume 34, Issue 2 - Mar 2010
Volume 34, Issue 1 - Jan 2010
Selecting the target year
Transport Properties of Fluorinated Polyimide/PMMA-g-Silica Nanocomposite Membrane
Kwon, Yu-Mi ; Im, Hyun-Gu ; Kim, Joo-Heon ;
Polymer Korea, volume 34, issue 1, 2010, Pages 1~7
To enhance the transport properties of gas separation membrane, we prepared 6FDA-6FpDA based polyimide membrane with PMMA-graft-silica nanoparticles. The silica was grafted PMMA which is miscible with 6FDA-based polyimide after surface treatment by 3-methacryloxypropyltrimethoxysilane (
-MPS). The untreated silica/6FDA-6FpDA membrane showed greater permeability and less selectivity than PMMA-g-silica/6FDA-6FpDA due to its low dispersion. The transport properties of PMMA-g-silica/6FDA-GFpDA membrane were measured as a function of filler concentration. These membranes were evaluated using pure gases (He,
). The increase in permeation was attributed to changes in the free volume distribution until 1 wt%. After 1 wt%, the permeability was decreased by excess silica which decreased effective area in polymer matrix. The selectivity was decreased with increasing permeability on the whole. However, the selectivity of
showed more enhance value.
Effects of Chain Extender and Inorganic Filler on the Properties of Semi-Rigid Polyurethane Foams
Cha, Gook-Chan ; Song, Jeom-Sik ; Lee, Suk-Min ; Mun, Mu-Seong ;
Polymer Korea, volume 34, issue 1, 2010, Pages 8~13
The physical properties of polymeric foams depend on the density of foams, physical properties of base polymers, the content of open cells, and cell structures including the size and its distribution, the shape of cell, and the thickness of skin layer. The foam density is affected by the chemistry of raw materials, the concentration of crosslinking agent and the blowing agent as well as the operating parameters during production process. In this study, the basic formulations of foams are composed of polyester polyol, MDI, amine catalyst, tin catalyst, silicone surfactant, and water. Cross-linking density of polyurethane was increased by using chain extenders. Also, the mechanical properties of polyurethane foam were improved by using the inorganic fillers (silica 1,2 and talc 1,2) having different
contents and particle sizes. We investigated the properties of modulus, tensile strength, compressive strength and hardness of foams obtained by changing kind of inorganic filler and chain extender, and observed the distribution of inorganic filler as well as variation of cell size within the foams by electron microscopy.
Improvement in Inorganic Affinity of Acrylic Materials for Conservation Treatment of Stone Cultural Assets
Kim, Youn-Cheol ; Kim, Un-Young ; Kim, Hyung-Joong ;
Polymer Korea, volume 34, issue 1, 2010, Pages 14~19
Applying acrylic silane monomer for determent of weathering damage of stone cultural assets from various sources was investigated to improve inorganic affinity of polymer impregnated to the stone for conservation treatment using impregnation of acrylic polymers under pressure. Radical polymerization was carried out with various mixture ratios of methacrylate (MMA), as the base monomer, and vinyl trimethoxy silane (VTMS). Subsequently, according to the changes of glass transition temperatures, average molecular weights, and storage moduli of the obtained copolymers, the case of adding 1 wt% of benzoyl peroxide, polymerization for 8 hrs, and mixing 5 mol% of VTMS to MMA was the optimum condition of monomer ratio and polymerization. Practically, fresh granites collected in domestic site and weathered stones were treated by following the obtained result above, and then, the moisture absorption, impact, acid resistance, and adhesion properties of the treated stones were compared to those of the corresponding stones treated with MMA only. It was found that those properties of the stones treated with PMV5 were considerably improved.
Radiolytic Preparation and Characterization of Poly(styrene sulfonic acic)-grafted ETFE Membranes
Ko, Beom-Seok ; Kang, Sung-A ; Fei, Geng ; Jeun, Joon-Pyo ; Nho, Young-Chang ; Kang, Phil-Hyun ; Kim, Chong-Yeal ; Shin, Jun-Hwa ;
Polymer Korea, volume 34, issue 1, 2010, Pages 20~24
In this study, ETFE-g-PSSA membranes with various degrees of grafting (DOG) and thicknesses were prepared by a simultaneous irradiation method. SEM-EDX instrument was applied to measure the relative distribution of sulfur which is corresponding to that of a grafted polymer over the Cross-section of the ETFE-g-PSSA membranes prepared at various irradiation conditions. The results indicate that to obtain the evenly-grafted membranes, a styrene/dichloromethane ratio is needed to be under 60 (v/v%), and a higher DOG is required as the film thickness increases. The effects of DOG and thickness on the ion exchanging capacity (IEC) and water uptake (WU) were investigated by measuring the IEC and WU values of the membranes with various DOG and thicknesses.
Preparation of Composite Particles via Electroless Nickel Plating on Polystyrene Microspheres and Effect of Plating Conditions
Kim, Byung-Chul ; Park, Jin-Hong ; Lee, Seong-Jae ;
Polymer Korea, volume 34, issue 1, 2010, Pages 25~31
Polymer core and metal shell composite particles have been prepared by the electroless nickel plating on the surface of monodisperse polystyrene microspheres. Various sizes of polystyrene particles with highly monodisperse state could be synthesized by controlling the dispersion medium in dispersion polymerization. Electroless nickel plating was performed on the polystyrene particle with diameter of
. The morphology of polystyrene/nickel composite particles was investigated to see the effect of the plating conditions, such as the
and glycine concentrations and the dropping rate of nickel plating solution, on nickel deposition. With
and glycine concentrations at more than 0.4 g/L and 1 M, respectively, more uniform nickel layer and less precipitated nickel aggregates were formed. At the given plating time of 2 h, the same amount of plating solution was introduced by varying the dropping rate. Though the effect of dropping rate on particle morphology was not noticeable, the dropping rate of 0.15 mL/min for 60 min showed rather uniform plating.
Photoinduced Alignment Based on the Blend of Poly(vinyl cinnamate) and Oligomeric Cinnamate via Linear Polarized UV Irradiation onto Groove Patterned Surface
Sung, Shi-Joon ; Kim, Mi-Ri ; Ahn, Do-Won ; Kim, Dae-Hwan ; Kang, Jin-Kyu ; Park, Jung-Ki ; Cho, Kuk-Young ;
Polymer Korea, volume 34, issue 1, 2010, Pages 32~37
Photo-alignment property of groove patterned surface prepared from blend of poly (vinyl cinnamate) (PVCi) and oligomeric dicinnamate was investigated for the application for alignment layer of liquid crystal display. The study of the photoreaction kinetics using UV-vis spectrum with the irradiation time showed that the reaction rate of oligomeric cinnamate was enhanced compared to that of PVCi. Blend where PVCi was main component showed a slight improvement on the photoreaction rate. It was unable to obtain groove patterned surface only using oligomeric cinnamate itself owing to the high crystalline character. However, blending of PVCi made it possible to obtain clear surface pattern. Molecular orientation could be confirmed from the polar plot data. It can be suggested that blend of oligomeric cinnamate and polymeric cinnamate is promising material for the photoalignment layer.
A Study of Synthesis and Property of
/Organic Core-Shell Particle
Seul, Soo-Duk ;
Polymer Korea, volume 34, issue 1, 2010, Pages 38~44
Core-shell particles of inorganic/organic pair were synthesized from
absorbed sodium dodecyl benzene sulfonate(SDBS) surfactant. Shell components were synthesized by sequential emulsion polymerization. Various monomers were used as shell components such as methyl methacrylate(MMA), ethyl acrylate(EA), butyl acrylate(BA), and styrene(St). Ammonium persulfate(APS) was used as an initiator and 2-ethylhexyl acylate(2-EHA) was used as a functional monomer, In the
/organic core-shell particle polymerization,
absorbed surfactant SDBS of 0.5 wt% was prepared first and then core
was encapsulated by emulsion polymerization. 0.1 wt% of APS was added sequentially to minimize the formation of new monomer particle during shell polymerization. The structure of inorganic/organic core-shell particles were characterized by measuring the decomposition degree of
using HCl solution, thermogravimetric analyzer, scanning electron microscope, and transmission electron microscope.
Preparation and Characterization of PVA/PAM Electrolyte Membranes Containing Silica Compounds for Direct Methanol Fuel Cell Application
Yoon, Seok-Won ; Kim, Dae-Hoon ; Lee, Byung-Seong ; Lee, Bo-Sung ; Moon, Go-Young ; Byun, Hong-Sik ; Rhim, Ji-Won ;
Polymer Korea, volume 34, issue 1, 2010, Pages 45~51
This study focuses on the investigation of the possibility of the crosslinked poly (vinyl alcohol) membranes with both poly (acrylic acid-co-maleic acid) (PAM) and 3-(trihydroxysilyl)-1-propane-sulfonic acid (THS-PSA) for the direct methanol fuel cell application. In order to characterize the prepared membranes, the water content, the thermal gravimetric analysis, the ion exchange capacity, the ion conductivity and the methanol permeability measurements were carried out and then compared with the existing Nafion 115 membrane. The ion exchange capacity of the resulting membranes showed 1.6~1.8 meq./g membrane which was improved than Nafion 115, 0.91 meq./g membrane. In the case of the proton conductivity, the THS-PSA introduced membranes gave more excellent
than Nafion 115,
. On the other hand, the methanol permeability was increased more than Nafion 115 for all the range of THA-PSA concentration.
Enhancement of Wetting Characteristics for Anisotropic Conductive Adhesive with Low Melting Point Solder via Carboxylic Acid-based Novel Reductants
Kim, Hyo-Mi ; Kim, Joo-Heon ;
Polymer Korea, volume 34, issue 1, 2010, Pages 52~57
The low viscous epoxy resin(bisphenol F) with carboxylic acid as the reductants was introduced for high performance and reliability in the ACA with a low melting point alloy filler system. The curing characteristics of the epoxy resin and temperature dependant viscosity characteristic of epoxy resin at the melting temperature of LMPA were investigated by dynamic mode of differential scanning calorimetry (DSC) and rheometer, respectively. Based on these thermo-rheological characteristics of epoxy resin and LMPA, the optimum process system was designed. In order to remove the oxide layer on the surface of LMPA particle, three different types of carboxyl acid-based reductant were added to the epoxy resin. The wetting angles were about
for carboxypropyldisilioxane, and
for the carboxy-2-methylethylsiloxane, respectively.
A Study on the Synthesis of Starch-Acrylic Polymer by Emulsion Polymerization
Lee, Mi-Suk ; Ryu, Hoon ; Cho, Ur-Ryong ;
Polymer Korea, volume 34, issue 1, 2010, Pages 58~62
The acrylic monomers were graft-polymerized to starch as matrix polymer by emulsion polymerization. Viscosity and particle size of the emulsion were increased with starch contents due to interaction with water and particle swelling toward the water phase by hydroxy group of starch. Chemical stability of the emulsion was also increased with enhancement of starch, but water and alkali resistance were reduced with increasing starch contents because of the increasement of hyrophilicity. Opacity of the starch-acrylic emulsion compound containing calcium carbonate was decreased with contents of starch by its intrinsic color. The film of starch-acrylic polymer showed more clear appearance with increasing starch contents owing to enhancement of amorphous state.
Reduction of Inflammatory Reaction of PLGA Using Fibrin; in vivo Study
Kim, Su-Jin ; Hong, Hyun-Hye ; Kim, Soon-Hee ; Kim, Hye-Lin ; Kim, Se-Ho ; Khang, Gil-Son ;
Polymer Korea, volume 34, issue 1, 2010, Pages 63~68
In this study, we evaluated the effect of fibrin, a natural material, on the local inflammatory reaction of PLGA in vivo. PLGA degradation products can decrease the pH in the surrounding tissue, causing local inflammatory reaction. To solve this problem, fibrin/PLGA scaffolds were implanted in 5-week-old Wister rats. To evaluate the influence of fibrin content on inflammatory cytokine expression induced by PLGA, RT-PCR analysis was used. Fibrous wall thickness and macrophage infiltration were evaluated by H&E and ED-1 immunohistochemical staining, respectively. In this study, we showed that fibrin/PLGA scaffolds reduced inflammatory reaction as compared to PLGA scaffold. We concluded that fibrin could reduce inflammatory response of PLGA.
Study on the Isomerization and Dehydrobromination Mechanism of Brominated Butyl Rubber
Wu, Yibo ; Guo, Wenli ; Li, Shuxin ; Gong, Liangfa ; Shang, Yuwei ;
Polymer Korea, volume 34, issue 1, 2010, Pages 69~73
Effects of reaction time and temperature on the isomerization and dehydrobromination reactions of brominated butyl rubber were investigated. The structural composition of brominated butyl rubber was determined by Fourier transform infrared spectroscopy (FT-IR) and proton nuclear magnetic resonance spectroscopy(
-NMR), Density functional theory (DFT) was used to study on the isomerization and dehydrobromination mechanisms of model compounds. The geometries for model compounds of 3-bromo-5,5,7,7-tetramethyl-2(2',2',4',4'-tetramethyl)pentyl-1-octylene (3BrOE), 1-bromo-5,5,7,7-tetramethyl-2(2',2',4',4'-tetramethyl)pentyl-2-octylene (1Br2OE) and 5,5,7,7-tetramethyl-2(2',2', 4',4'-tetramethyl)pentyl-1,3-octadiene (CD) had been optimized by using density functional theory at B3LYP/3-21G and B3LYP/6-31G levels. The predicted energy of 3BrOE lies higher than that of 1Br2OE which suggests that 1Br2OE configuration is more stable than the 3BrOE configuration. Compared with the energy barrier, the pathway of dehydrobromination is less competitive than that of isomerization. This is qualitatively consistent with the experimental results.
A Study on Characterization of Polyethylene Separators Irradiated at Various Electron Beam Current Conditions
Im, Jong-Su ; Sohn, Joon-Yong ; Shin, Jun-Hwa ; Lim, Youn-Mook ; Choi, Jae-Hak ; Kim, Jeong-Soo ; Nho, Young-Chang ;
Polymer Korea, volume 34, issue 1, 2010, Pages 74~78
In this paper, crosslinked polyethylene (PE) separators for lithium secondary batteries were prepared by an electron beam irradiation under various beam currents and dose rates. The crosslinking degree increased up to maximum 71% with an increasing absorption dose and with a decreasing beam current. The PE separators irradiated at lower beam currents showed better thermal shrinkage (51%) and mechanical properties than the original PE separator and PE separators irradiated at higher beam current. The ionic conductivity (
) and electrolyte uptake (275%) of the crosslinked PE separators were comparable to the original PE separator.
Preparation and Release Property of Alginate Beads Immobilizing Poly(N-isopropylacrylamide-co-dimethylamino ethyl methacrylate)
Kang, Mi-Kyoung ; Kim, Jin-Chul ;
Polymer Korea, volume 34, issue 1, 2010, Pages 79~83
Alginate beads were prepared using poly(N-isopropylacrylamide-co-dimethylamino ethyl methacrylate)(P(NIPAM-co-DMAEMA)). First, P(NIPAM-co-DMAEMA) was immobilized on the surface of alginate beads by taking advantage of electrostatic interaction between alginate and P(NIPAM-co-DMAEMA). Second, P(NIPAM-co-DMAEMA) was contained in the matrix of alginate beads. P(NIPAM-co-DMAEMA) were prepared by a free radical polymerization at
for 12 h. The weight ratio of NIPAM to DMAEMA monomer was 95/5. The copolymer was identified by
-NMR. Releases from the alginate beads were observed at 30, 37, and
using blue dextran or FITC-dextran(fluorescein isothiocyanate-dextran) as a model drug. The effect of temperature on the degree of release from the beads was insignificant. FITC-dextran was released more than blue dextran possibly due to its smaller molecular weight.
The Blending Effect of Electro-deposited Copper-indium-diselenide Particles on the Photovoltaic Properties of Poly(3-octylthiophene)/Fullerene Bulk Heterojunction Cells
Cho, Young-Don ; Lee, Sun-Hyoung ; Kim, Jeong-Soo ;
Polymer Korea, volume 34, issue 1, 2010, Pages 84~87
Copper-indium-diselenide (CIS) particles were prepared by the electrochemical reduction from the mixture solution of corresponding ion compounds. The prepared CIS was used as an insertion layer or a blending component in the organic photovoltaic bulk heterojunction cells composed of poly(3-octylthiophene) and fullerene. The increase of CIS content resulted in the rapid decrease of the open-circuit voltage as well as short-circuit current. The photovoltaic parameters were analyzed in relation to the structures, composition, and morphology of the photovoltaic blends.