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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 31, Issue 6 - Nov 2007
Volume 31, Issue 5 - Sep 2007
Volume 31, Issue 4 - Jul 2007
Volume 31, Issue 3 - May 2007
Volume 31, Issue 2 - Mar 2007
Volume 31, Issue 1 - Jan 2007
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Synthesis of Sulfonated POF-g-Styrene ion Exchange Fibers by Radiation-Induced Polymerization and Properties of Ammonia Adsorption
Cho, In-Hee ; Baek, Ki-Wan ; Lee, Chang-Soo ; Nho, Young-Chang ; Yoon, Soo-Kyung ; Hwang, Taek-Sung ;
Polymer Korea, volume 31, issue 1, 2007, Pages 1~7
In this study, the sulfonated ion exchange fiber was synthesized by
radiation-induced graft copolymerization. Degree of grafting (DG) increased with increasing the total dose and showed the highest value at 50 v/v% styrene monomer. And also, the degree of sulfonation (DS) increased with increasing the DG and reaction temperature. DS showed the maximum value at 20 min. Ion exchange capacity and swelling ratio of ion exchange fibers increased with increasing the DS and their maximum values were 4.76 meq/g and 23.5%, respectively. Ammonia adsorption increased as increasing the ammonia concentration and ion exchange capacity and remained constant over 10 cycles.
Characteristics of Nylon 6/Poly(acrylonitrile-co-styrene-co-acrylic rubber) Blends Containing Compatibilizer
Kim, Lang-Wook ; Yoo, Sun-Hwa ; Kim, Chang-Keun ;
Polymer Korea, volume 31, issue 1, 2007, Pages 8~13
To overcome drawbacks of the nylon 6/poly (acrylonitrile-co-butadiene-co-styrene) (ABS) blend, nylon 6 blend with poly (acrylonitrile - co-styrene - co-acrylic rubber) (ASA) which containing poly (butyl acrylate) as a rubber phase in substitute of poly (butadiene) in ABS, was examined. Poly (styrene-co-maleic anhydride) (SMA) containing 25 wt% of maleic anhydride (MA) or poly (styrene- co-acrylo-nitrile-co-maleic anhydride) (SANMA) containing less than 3 wt% MA was used as a compatibilizer to fabricate blends having high impact strength. Changes in the mechanical properties of nylon 6/ASA blend with compatibilizer content were similar with those of nylon 6/ABS blend. Blends haying high impact strength was produced when blends contained more than about 20 wt% rubber. Blends containing SAM or SANMA as a compatibilizer were stayed in a injection molding machine at the molding temperature and afterwards specimens for the examination of the impact strength was prepared. Impact strength of blends containing SMA was decreased with retention time, while that of blends containing SANMA was not changed with retention time.
Biodisc Tissue-Engineered Using PLGA/DBP Hybrid Scaffold
Ko, Youn-Kyung ; Kim, Soon-Hee ; Jeong, Jae-Soo ; Ha, Hyun-Jung ; Yoon, Sun-Jung ; Rhee, John-M. ; Kim, Moon-Suk ; Lee, Hai-Bang ; Khang, Gil-Son ;
Polymer Korea, volume 31, issue 1, 2007, Pages 14~19
Demineralized bone particle (DBP) has been used as one of the powerful inducers of bone and cartilage tissue specialization. In this study, we fabricated DBP/PLGA scaffold for tissue engineered disc regeneration. We manufactured dual-structured scaffold to compose inner cylinder and outer doughnut similar to nature disc tissue. The DBP/PLGA scaffold was characterized by porosity, wettability, and water uptake ability. We isolated and cultured nucleus pulposus (NP) and annulus fibrosus (AF) cells from rabbit intervertebral disc. We seeded NP cells into the inner core of the hybrid scaffold and AF cells into the outer portion of it. Cellular viability and proliferation were assayed by 3-(4,5-dimethylthiazole-2-yl) -2,5- diphenyltetrazolium -bromide (MTT) test. PLGA and PLGA/DBP scaffolds were implanted in subcutaneous of athymic nude mouse to observe the formation of disc-like tissue in vivo. And then we observed change of morphology and hematoxylin and eosin (H&E). Formation of disc-like tissue was better DBP/PLGA hybrid scaffold than control. Specially, we confirmed that scaffold impregnated 20 and 40% DBP affected to proliferation of disc cell and formation of disc-like tissue.
Formulation and Characterization of Lipase Loaded Poly(D,L - lactide-co-glycolide) Nanoparticles
Kim, Beom-Su ; ZEROUAL, Y ; Lee, Kang-Min ;
Polymer Korea, volume 31, issue 1, 2007, Pages 20~24
The preservation of biological activity of protein drugs in formulation is still a major challenge for successful drug delivery. Lipase was encapsulated in poly (D,L-lactide- co-glycolide) PLGA nano-particles using a w/o/w solvent evaporation technique. The lipase-containing PLGA/poly (vinyl alcohol) (PVA) nanoparticles were characterized with regard to morphology, size, size distribution, lipase-loading efficiency, in vitro lipase release, and stability of lipase activity. The size of nanoparticles increased as polymer concentration was increased. The size of particles was not significantly affected by the PVA concentration; on the other hand, the particle size distribution was the narrowest when 4% of PVA was used. In optimum conditions, we possessed nanoparticles that characterized 72.5% of encapsulation efficiency,
size diameter. During the initial burst phase, the in vitro release rate was very fast, reaching 83% within 12 days. Until days 6, enzyme activity increased as the amount of lipase released was increased.
Enhancement of Physical Properties in Partially Crosslinked Waste High Density Polyethylene
Lee, Jong-Rok ; Lee, Dong-Gun ; Hong, Soon-Man ; Kang, Ho-Jong ;
Polymer Korea, volume 31, issue 1, 2007, Pages 25~30
The characteristics of crosslinking and physical properties in partially crosslinked waste high density polyethylene (HDPE) were studied by introducing reactive melt processing with perbutyl peroxide (PBP). It was found that impurities in waste HDPE affected the crosslinking kinetics. Decrease in density and heat of fusion were observed in partially crosslinked HDPE while its melt viscosity increased. It was explained that impurities in waste HDPE enhanced the crosslinking compared to pure HDPE As a result, dramatic mechanical property improvement was achieved in the waste HDPE by crosslinking reaction.
Plasma-Surface-Treatment of Nylon 6 Fiber for the Improvement of Water-Repellency by Low Pressure RF Plasma Discharge Processing
Ji, Young-Yeon ; Jeong, Tak ; Kim, Sang-Sik ;
Polymer Korea, volume 31, issue 1, 2007, Pages 31~36
It has been reported that the surface properties of the plasma treated material were changed while maintaining its bulk properties. In this study, surface modification of nylon fiber by plasma treatment was tried to attain high water-repellency Nylon fiber was treated with RF plasma under a vacuum system using various parameters such as gas specious, processing time and processing power. Morphological changes by low pressure plasma treatment were observed using scanning electron microscopy (SEM) and atomic force microscopy (AFM). Moreover, the mechanical and inherent properties were analyzed by tensile strength, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA). The high water-repellency property of nylon fiber was evaluated by a water-drop standard test under various conditions in terms of aging effect. The results showed that the water-repellency of plasma-surface-treated nylon fiber was greatly improved compared to untreated nylon fiber.
Synthesis and Thermotropic Liquid Crystalline Behaviors of 6-[4-(4'-(nitrophenylazo) phenoxycarbonyl)] pentanoated Polysaccharides
Jeong, Seung-Yong ; Ma, Yung-Dae ;
Polymer Korea, volume 31, issue 1, 2007, Pages 37~46
Fully or nearly fully 6- [4- (4'- (nitrophenylazo)phenoxycarbonyl)]pentanoated polysaccharide derivatives were synthesized by reacting cellulose, amylose, chitosan, chitin, alginic acid, pullulan or amylopectin with 6- [4- (4'- (nitrophenylazo)phenoxy) ] pentanoyl chloride (NA6C) and their thermotropic liquid crystalline behaviors were investigated. Like in the case of NA6C, all the polysaccharide derivatives formed monotropic nematic phases, suggesting that the mesophase structure of the polysaccharide derivatives is dertermined by the mesogenic side groups and not by the polysaccharide backbone. This is the first report of polysaccharide derivatives, except cellulose derivative, that form thermotropic nematic phases. The thermal stability and degree of order of the nematic phases observed for poly saccharide derivatives were significantly different from those reported for the polymers in which the azobenzene groups are attached to flexible or rigid backbones through flexible spacers. The results were discussed in terms of the difference in the arrangement of the main and side chains and the flexibility of the main chain.
Polyurethane Flexible Foam for Automotive Seat Cushion Having Both Superior Static and Dynamic Properties
Hong, Chae-Hwan ; Back, Han-Sung ; Kim, Kyung-Man ; Kim, Sung-Yoon ; Choi, Sok-Min ; Hwang, Tae-Won ;
Polymer Korea, volume 31, issue 1, 2007, Pages 47~52
Polyurethane flexible foams have been widely used for automotive seat cushions because of their excellent performance. It has been required so far to reduce the density of seat cushion foam. However, recently, improving the riding comfort of seat cushions becomes more important. With regard to riding comfort, we investigated the improvement of static properties such as the ball rebound property and the hysteresis loss. We also studied the vibration characteristics, which are well known as an important factor to affect the comfort performance during driving.
Flame Retardancy of UV-Cured Epoxy Acrylate Resin Containing Combined Flame Retardants
Kim, Ho-Gyum ; Lee, Dong-Ho ; Min, Kyung-Eun ;
Polymer Korea, volume 31, issue 1, 2007, Pages 53~57
In this study, the flame retardancy and tensile properties of epoxy acrylate resin containing flame retardants based on phosphorous, bromine or metal hydroxide are investigated. It was found that the enhancement in flame retardancy of epoxy acrylate with decabromodiphenyl oxide (DECA) addition was better than the addition of 2,2,2-trichloroethyl dichlorophosphate (TCEDP). It seems that the high loading of TCEDP may delay the formation of crosslinking network and consequently decreases the conversion of epoxy acrylate. It was found that magnesium hydroxide (
) does not improve the flame retardancy of epoxy acrylate after added up to 40 wt%. The synergic effects were clearly observed for epoxy acrylate containing DECA/TCEDP combined flame retardants.
Thermotropic Liquid Crystalline Properties of Cholesteryloxycarbonated and (8-Cholesteryloxycarbonyl) heptanoated Disaccharides
Jeong, Seung-Yong ; Ma, Yung-Dae ;
Polymer Korea, volume 31, issue 1, 2007, Pages 58~67
Fully cholesteryloxycarbonated and (8-cholesteryloxycarbonyl) heptanoated disaccharide derivatives were synthesized by reacting cellobiose, maltose, and lactose with cholesteryl chloroformate or 8- cholesteryloxycarbonylheptanoyl chloride, and their thermotropic liquid crystalline properties were investigated. All the cholesteryloxycarbonated derivatives (CH1DSs) formed enantiotropic cholesteric phases, whereas all the (8-cholesteryloxycarbonyl) heptanoated derivatives (CH8DSs) exhibited monotropic cholesteric phases with left-handed helicoidal structures whose optical pitches (
) decrease with increasing temperature. All the CH1DSs, contrast with the CH8DSs, did not display reflection colors over the full cholesteric range, suggesting that the helicoidal twisting power of the cholesteryl group highly depends on the length of the spacer joining the cholesteryl group to the disaccharide chain. The thermal stability and degree of order in the mesophase and the temperature dependence of the
observed for EH8DSs were entirely different from those reported for the cholesterol-bearing dimers and triplet and the (8-cholesteryloxycarbonyl) heptanoated polysaccharide derivatives. The results were discussed in terms of the difference in the number of the mesogenic units per mole of repeating unit and the flexibility of the main chain.
Synthesis and Applications of Reactive Polymer Modifiers for Asphalt(1)
Hwang, Ki-Seob ; Ahn, Won-Sool ; Suh, Soong-Hyuck ; Ha, Ki-Ryong ;
Polymer Korea, volume 31, issue 1, 2007, Pages 68~73
This study is on the synthesis of reactive polymer modifiers by emulsion polymerization to improve properties of asphalt for paving. Styrene, methyl methacrylate (MMA), isoprene and glycidyl methacrylate (GMA) which has epoxy ring to react with carboxyl group of asphaltene were used to synthesize polymer modifiers. Modifiers with various composition were tested miscibility with asphalt. Modifiers which showed good miscibility with asphalt were investigated by DSC for
. Existence of epoxy rings and their reaction with asphaltene wore investigated by FTIR. Molecular structures of synthesized modifiers were confirmed by
. The synthesized modifiers which showed good miscibility had their
in the range of
and had isoprene contents of 30 wt%. They showed good miscibility in the 1 and 2 wt% concentrations, but not in the 3 wt% concentration.
Preparation and Characteristics of Polypyrrole/sulfonated Poly(2,6-dimethyl-1,4-phenylene oxide) Composite Electrode
Huh, Yang-Il ; Jung, Hong-Ryun ; Lee, Wan-Jin ;
Polymer Korea, volume 31, issue 1, 2007, Pages 74~79
Polypyrrole (PPy) was made by an emulsion polymerization using iron (III) chloride (
) as an initiator and dodecyl benzene sulfuric acid (DBSA) as an emulsifier and dopant. Poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) was sulfonated by chlorosulfonic acid (CSA). The cathode was composed of
complex, conductor powder, and PPO or sulfonated poly (2,6-dimethyl-1,4-phenylene oxide) (SPPO) as a binder or dopant. The charge-discharge performance of
cathode was increased as the extent of about 50%, than
. This is because SPPO played a role as a binder as well as a dopant. In addition, sulfonation brings out the increase of miscibility between PPy and SPPO, and the increase of contact area between cathode and electrolyte.
Preparation and Properties of Siloxane Modified EPDM/HDPE/Carbon black Composite
Lee, Byoung-Chul ; Kang, Doo-Whan ;
Polymer Korea, volume 31, issue 1, 2007, Pages 80~85
Maleic anhydride (MA) modified ethylene-propylene-diene terpolymer (MEPDM) was pre-pared from solution polymerization. MEPDM-g-PST copolymer was prepared by melt polymerization of male ate d EPDM and quaternary ammonium silyl polydimethylsiloxane -7,7,8,8- tetracyanoquinodimethane (TCNQ) adduct (PST) in internal mixer and MEPDM-g-PST/HDPE/CB (MPEC) was prepared by com-pounding HDPE, MEPDM-g-PST copolymer and carbon black (CB, 5, 10, 15, and 20 phr), and HDPE/ CB (PEC) by compounding HDPE and CB (5, 10, 15, and 20 phr), respectively. The structure of MEPDM-g-PST copolymer was confirmed by measuring the FTIR. The maximum grafting ratio of MA onto EPDM was 2.35%. The thermal and mechanical properties of the composites were measured and dispersion characteristics of CB in matrix show that CB in MPEC was better dispersed than that in PEC composite.
Preparation and Characteristics of Silicone Modified Polyacrylic Hybrid Elastomer
Lee, Byoung-Chul ; Kang, Doo-Whan ;
Polymer Korea, volume 31, issue 1, 2007, Pages 86~91
Polydimethylsiloxane branched HEMA (SH) was Prepared by reacting polydimethylsilorane prepolymer and 2-hydroxyethyl methacrylate (HEMA). Polyacrylate modified Polyorganosiloxane (SMPA) was prepared by polymerization of methacrylic acid(MA), allyl glycidyl ether(AGE), aminopro- pyltrimethoxysilane (APTS), and SH. Their structures were confirmed by the measurement of FTIR and
and thermal properties of SMPA were studied from TGA. Residual weight of SMPA at
increased according to increasing content of the APTS to 63 from 55%. SMPA sealant was prepared by adding additives, such as viscosity increasing agent, crosslinking agent, and fillers. Adhesion characteristics of SMPA-3 sealant was determined to be maximum load elongation, 2.01 %, and break load elongation, 2.28%. Adhesion characteristics for SMPA sealant prepared from SMPA-3 were better than those for SMPA sealant prepared from SMPA-1 and SMPA-2.