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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
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Fabrications and Properties of Colorless Polyimide Films Depending on Various Heat Treatment Conditions via Crosslinkable Monomer
Choi, Il-Hwan ; Chang, Jin-Hae ;
Polymer Korea, volume 34, issue 5, 2010, Pages 391~397
Poly(amic acid)(PAA) was prepared by reaction of bicyclo(2,2,2)oct-7-ene-2,3,5,6-tetracarboxylicdianhydride(BTDA) containing double bond for crosslinking and bis[4-(3-aminophenoxy) phenyl] sulfone(BAPS) in N,N-dimethylacetamide(DMAc). The cast film of PAA was heat-treated at different temperatures to create polyimide(PI) films. With increasing thermal crosslinking temperatures from 250 to
, the thermo-mechanical properties, degree of crosslinking, and optical transparency of the cross-linked PI were investigated. The maximum enhancement in the thermo-mechanical properties was observed at a heat treatment condition of
. However, the optical transparency was found to be optimal for
heat treatment. The degree of crosslinking in NMR was determined to be 85% to 93% with increasing annealing temperature conditions from 250 to
The Comparison of Sponges and PLGA Scaffolds Impregnated with DBP on Growth Behaviors of Human Intervertebral Disc Cells
Lee, Seon-Kyoung ; Hong, Hee-Kyung ; Kim, Su-Jin ; Kim, Yong-Ki ; Song, Yi-Seul ; Ha, Yoon ; Lee, Dong-Won ; Khang, Gil-Son ;
Polymer Korea, volume 34, issue 5, 2010, Pages 398~404
We fabricated sponge and poly(lactide-co-glycolide)(PLGA) scaffolds impregnated demineralized bone particle(DBP)(DBP/PLGA) and investigated proper condition to proliferation and phenotype maintenance of intervertebral disc(IVD) cells by comparison between DBP/PLGA scaffold and DBP sponge. DBP/PLGA scaffolds were prepared by solvent casting/salt leaching. Human IVD cells were seeded in scaffolds of two types. Cell viability and proliferation according to scaffolds were analyzed by WST assay and SEM. RT-PCR was assessed to measure mRNA expression of aggrecan and type II collagen of human IVD cells. In WST assay results, cell viability in scaffolds impregnated DBP/PLGA scaffold were higher than DBP sponge. We could observe that disc cell mRNA expressed better in DBP/PLGA scaffold than DBP sponge. We concluded that the using of DBP/PLGA in terms of scaffold fabrication for bio-disc with human IVD cells is helpful growth of disc cells maintenance of phenotypes.
Syntheses of Novel Sol-Gel Precursor Containing Anti-corrosive Functional Group and Their Uses in Organic-Inorganic Hybrid Coatings
Han, Mi-Jeong ; Mang, Ji-Young ; Seo, Ji-Yeon ;
Polymer Korea, volume 34, issue 5, 2010, Pages 405~409
New sol-gel precursors having the ability to protect iron against corrosion were synthesized and used to prepare organic-inorganic hybrid coatings based on epoxy. Bisphenol A epoxy was modified with 3-isocyanatopropyltriethoxysilane to improve the compatibility, and water and HCl were used as catalysts for sol-gel process. Various coating formulations were prepared depending on the type of sol-gel precursors and the amount of each ingredient, and cast on iron substrates by dip-coating and thermally cured. Corrosion protection properties of coated iron were studied by a salt spray test and electrochemical impedance spectroscopy under 0.1 M NaCl electrolyte. Hybrid coatings containing anticorrosive functional group exhibited excellent corrosion protection on iron, compared to that of typical hybrid coatings. From electrochemical impedance spectroscopy, the hybrid coatings containing anticorrosive functional group could maintaine the initial impedance after 500 h, while the impedance of hybrid coatings without them started to decrease after 24 h.
Preparation of Polymer-modified Mortars with Recycled PET and Their Sound Absorption Characteristics
Hong, Byung-Pyo ; Byun, Hong-Sik ;
Polymer Korea, volume 34, issue 5, 2010, Pages 410~414
Two different types of polymer-modified mortars(PMM) were prepared with recycled PET and fly-ash. One is rigid PMM and the other is flexible PMM which are based on the composition of recycled PET. Their mechanical properties including friction coefficient measurement and damping characteristics such as sound absorption were investigated and compared with the commercial PMM such as epoxy PMM and PET PMM. The result from mechanical properties indicated that the rigid PMM could be competitive with the commercial PET PMM. The measurement of sound absorption coefficient showed that both rigid PMM and flexible PMM had much better damping capacity than commercial PMM. However, the friction coefficient of rigid PMM revealed that it would be suitable for the use as floor material.
Probe Diffusion and Viscosity Properties in Dimethyl Sulfoxide Solution of Poly(vinyl alcohol) with High Degree of Hydrolysis
Eom, Hyo-Sang ; Park, Il-Hyun ;
Polymer Korea, volume 34, issue 5, 2010, Pages 415~423
Poly(vinyl alcohol)(PVA) with high degree of hydrolysis of above 98% was dissolved in dimethyl sulfoxide(DMSO), and the shear viscosity was measured up to
in the semi-dilute solution regime. Next, as probe particle, polystyrene(PS) latex was introduced into this matrix system and its delayed diffusion due to polymer concentration was investigated by means of dynamic light scattering. When the solution viscosity of PVA/DMSO was plotted against the reduced concentration
, which is scaled by the intrinsic viscosity, the molecular weight dependence was strongly appeared at C
>2. Some heterogeneties in polymer solution were considered as its source. Contrary, the diffusion of probe particle in the matrix solution was observed as a single mode motion at whole concentration range but its ratio of its diffusion coefficient at solution to that at solvent, D/Do did not show any molecular weight dependence at all. However, the application limit of the stretched exponential function was disclosed at C
Preparation and Thermal Properties of Aliphatic Network Polyester-Silica Composites
Oh, Chang-Jin ; Park, Su-Dong ; Han, Dong-Cheul ; Kwak, Gi-Seop ;
Polymer Korea, volume 34, issue 5, 2010, Pages 424~429
The hybrid composites of aliphatic polyester-silica were prepared via a sol-gel reaction and their potential application using as a buffer coating layer in the thermoelectric device were investigated. When aliphatic polyesters were thermally treated at a high temperature of
, the polymer showed an increases in thermal degradation temperature by
according to the thermal treatment time. The polyester-silica composites showed an increases in thermal degradation temperature by
according to the content of the added silica. Polyester-silica composite showed neither discoloration nor change in optical properties because Knoevenagel condensation reaction was hindered by silica structure. The thermal conductivity of the composites increased linearly according to the content of added silica.
The Effect of Fillers on Rubber Characteristics for Gasket to Lithium Ion Battery
Seo, Kwan-Ho ; Cho, Kwang-Soo ; Yun, In-Sub ; Choi, Woo-Hyuk ; Hur, Byung-Ki ; Kang, Dong-Gug ;
Polymer Korea, volume 34, issue 5, 2010, Pages 430~433
The gasket materials of for the lithium ion battery requires chemical resistance to electrolyte, electrical insulating, compression set, anti-contamination and low temperature property. To check the special characteristics of fillers which are applied to rubber for gasket, compound of EPDM, NBR and FKM (fluoro elastomer) were made by adjusting weights of carbon black and silica additive. Using these compounds, we had done tests of long-term stability against electrolyte, compression set and low-temperature property with considering operating condition of the lithium ion battery. From this test, we investigated the physical and chemical characteristics of rubber with using of carbon black and silica additive in each.
Inverse Emulsion Polymerization of Water Absorbent Polymer for Strength Enhancement of Mortars
Hwang, Ki-Seob ; Jung, Myoung-Geun ; Jang, Seok-Soo ; Jung, Yong-Wook ; Lee, Seung-Han ; Ha, Ki-Ryong ;
Polymer Korea, volume 34, issue 5, 2010, Pages 434~441
Sodium polyacrylate (PAANa) was synthesized by inverse emulsion polymerization method to absorb excess water in concrete. Liquid paraffin was used as a continuous phase. Acrylic acid (AA) was neutralized by aqueous sodium hydroxide solution (8 M). Different amount of N,N'-methylene bisacrylamide (MBA) was used as a crosslinking agent to change crosslinking density of the synthesized PAANa. The size distribution of synthesized particles was measured by particle size analyzer. Swelling ratio of crosslinked PAANa was evaluated from the equation in D. I. water, cement aqueous solution, and
aqueous solution. The FTIR spectroscopy was used to characterize
ion interaction with PAANa. Incorporation of 1.0 wt% PAANa into cement increased compressive and flexural strength approximately 30% and 10%, respectively, compared with those of ordinary portland cement.
Fabrication and Characterization of Polyurethane Foam for Wound Dressing
Kim, Won-Il ; Kim, Cheol-Joo ; Kim, Dae-Yeon ; Kwon, Oh-Kyoung ; Kwon, Oh-Hyeong ;
Polymer Korea, volume 34, issue 5, 2010, Pages 442~449
Polyurethane(PU) prepolymer was synthesized from ethylene oxide/propylene oxide(EO/PO) random polyether polyol, toluene diisocyanate and chain extender such as ethylene glycol and 1,4-butanediol. PU foams having various compositions were fabricated from PU prepolymers with different hard segment contents(%) and mixed foaming solution of different compositions. PU foam from chain extender-introduced PU prepolymer and mixed foaming solution containing glycerin showed better mechanical property than other groups. Various PU foams were tested on their mechanical property, moisture vapor transmission rate, absorption speed, absorptivity, morphology and cell culture test. According to the test, the PU foam fabricated from chain extender-introduced PU prepolymer and mixed foaming solution containing optimum composition of F-68, glycerin and CMC was found to have the best property for wound dressing materials. From in vivo animal study, it was confirmed that above PU foam showed rapid wound recovery.
A Study on the Electrical and Optical Properties of Micro-Pattern of Polypyrrole(PPy) by Using Vapor Phase Polymerization
Han, Yong-Hyeon ; Yim, Jin-Heong ;
Polymer Korea, volume 34, issue 5, 2010, Pages 450~453
The electrical/optical properties and surface structures of polypyrrole (PPy) thin films, which were prepared by liquid phase polymerization (LPP) and vapor phase polymerization (VPP) of pyrrole using FTS as an initiatior are compared. The PPy thin film prepared by VPP showed superior surface resistance characteristics as compared with that prepared by LPP. We investigated the relation between surface morphology of PPy film and surface resistance by surface characteristic analysis. The surface of PPy thin film prepared by VPP was smoother than that prepared by LPP. Micro-patterned PPy thin film could be prepared effectively using VPP-combined ink-jet printing and soft lithography.
Microstructural Changes in Orthopaedic-Grade Ultra High Molecular Weight Polyethylene (UHMWPE) according to Gamma-Irradiation Method
Lee, Kwon-Yong ;
Polymer Korea, volume 34, issue 5, 2010, Pages 454~458
In this study, the microstructural changes in orthopaedic-grade ultra high molecular weight polyethylene (UHMWPE) were compartively investigated for six different gamma-irradiation methods. Compared with un-irradiation (UGI), conventional gamma-irradiation in air room temperature (AR) induced statistically significant increases of relative crystallinity and percent crosslinking in UHMWPE. Vacuum environment (VR) during gamma-irradiation significantly increased the percent crosslinking in UHMWPE. Vacuum extreme low temperature (V77) during gamma-irradiation induced no significant changes in both relative crystallinity and percent crosslinking of UHMWPE but the percent crosslinking of UHMWPE in VR and V77 was significantly larger than that in AR. Post-irradiation stabilization process significantly increased the relative crystallinity of UHMWPE in V77, and it also significantly increased the percent crosslinking of UHMWPE in AR and V77.
Preparation and Characterization of L-Arginine Containing Poloxamer Hydrogels for Solubilization and Sustained Release of Amphotericin B
Shin, Baek-Ki ; Baek, Eun-Jung ; Kim, Ye-Tae ; Jeong, Ji-Woong ; Nho, Young-Chang ; Lim, Youn-Mook ; Park, Jong-Seok ; Huh, Kang-Moo ; Park, Jeong-Sook ;
Polymer Korea, volume 34, issue 5, 2010, Pages 459~463
Amphotericin B (AmB) is anti-fungal agent for the treatment of systemic fungal infections, but its poor solubility has limited clinical applications. In this study, a new gel formulation made up of L-arginine as solubilizer, thermosensitive Poloxamer 407 (P 407), and adhesive carbopol was designed for effective solubilization and delivery of AmB. The aqueous solubility of AmB was enhanced up to 2.6 mg/mL by addition of L-arginine. Aqueous P 407 solutions of more than 20% w/v showed thermo-induced sol-gel-sol phase transition. The phase transition behavior was affected by the presence of AmB and L-arginine, and the phase transition range was broadened by addition of carbopol. In vitro drug release was improved by the solubilizing effect of L-arginine, and the presence of mucoadhesive carbopol prolonged the release rate as a function of concentration.
Preparation of Poly(vinylbenzyl chloride)-grafted Fluoropolymer Films by Using Radiation Grafting Method
Fei, Geng ; Sohn, Joon-Yong ; Lee, Youn-Sik ; Nho, Young-Chang ; Shin, Jun-Hwa ;
Polymer Korea, volume 34, issue 5, 2010, Pages 464~468
In this study, a vinylbenzyl chloride (VBC) monomer was successfully grafted onto the several fluoropolymer films including poly(tetrafluoroethylene-co-hexafluoropropylene) (FEP), poly(tetrafluoroethylene-co-perfluoropropylvinyl ether) (PFA), and poly(ethylene-co-tetrafluoroethylene) (ETFE) films by using a simultaneous irradiation method. The results indicated that PVBC graft polymer can be easily grafted onto the ETFE film than other fluorinated films under the same irradiation condition. The grafted films were characterized by using FTIR, TGA, and SEM-EDS instruments. The elongation at the breaking of the grafted films was found to decrease with an increase of degree of grafting (DOG). The PVBC-grafted ETFE films were found to have better mechanical properties than other PVBC-grafted fluorinated films.
Study on the Curing Properties of Photo-curable Acrylate Resins
Kim, Sung-Hyun ; Chang, Hyun-Suk ; Park, Sun-Hee ; Song, Ki-Gook ;
Polymer Korea, volume 34, issue 5, 2010, Pages 469~473
The curing mechanism and characteristics of UV curable acrylate resins were studied using Photo-DSC, FTIR, and Raman spectroscopy. Effects of chemical structures of acrylate, numbers of functional group, and UV intensity on curing kinetics were investigated with Photo-DSC. FTIR and Raman spectroscopy has been used to understand curing mechanisms and reaction conversion. In order to investigate the effect of oxygen on the photo-curing reaction, the curing process was compared between the acrylate and thiol-ene resins. The reaction conversion was found to be less than 80% for acrylate resins. The photo-curing reaction of the acrylate resin could not proceed to the end because of oxygen which acts as a reaction inhibitor while the thiol-ene resin was hardly affected from oxygen during the curing process.
Effects of Laminated Cylindrical Scaffolds of Keratin/Poly(lactic-co-glycolic acid) Hybrid Film on Annulus Fibrous Tissue Regeneration
Lee, Seon-Kyoung ; Hong, Hee-Kyung ; Kim, Su-Jin ; Kim, Yong-Ki ; Lee, Dong-Won ; Khang, Gil-Son ;
Polymer Korea, volume 34, issue 5, 2010, Pages 474~479
We developed laminated cylindrical scaffolds composed of poly(lactide-co-glycolide)(PLGA) and keratin, and investigated their potential for tissue engineering and disk regeneration. The scaffold was designed to have two parts, i.e. inner cylinder and outer disk, to mimic a natural disk. The outer disk was composed of PLGA and the inner cylinder was prepared using PLGA film or PLGA/keratin hybrid film. In this study, we investigated the effects of keratin on the growth and proliferation of annulus fibrous(AF) cells in the cylindrical scaffolds. Scaffolds containing PLGA/keratin films showed a significantly higher cell proliferation and expression of collagen I and II than the counterpart with PLGA films. Keratin containing scaffolds also exhibited an excellent mechanical strength, demonstrating that keratin influences the proliferation of annulus fibrous cells. The results provide valuable information on PLGA/keratin films for tissue engineered disk regeneration.
Characterization of Colorless and Transparent Polyimide Films Synthesized with Various Amine Monomers
Choi, Il-Hwan ; Chang, Jin-Hae ;
Polymer Korea, volume 34, issue 5, 2010, Pages 480~484
A series of poly(amic acid)s(PAAs) was prepared by reacting 4,4'-(4,4'-isopropylidenediphenoxy) bis(phthalic anhydride)(BPADA) as the anhydride monomer and 2,2'-bis(trifluoromethyl) benzidine (TFB), bis(3-aminophenyl)sulfone (APS), 4,4'-methylenebis-(2-methylcyclohexylamine) (MMCA), or bis[4-(3-aminophenoxy) phenyl] sulfone (BAPS) as the amine monomer with 5 mol% melamine in N,N-dimethylacetamide (DMAc). Colorless and transparent polyimide (PI) films were obtained by casting the PAAs at various heat treatment temperatures. The thermo-mechanical properties and optical transparency of the PI films were investigated. The thermal properties of the PI films were examined using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and thermomechanical analysis (TMA), and their optical transparency were measured by spectrophotometry. The coefficient of thermal expansion (CTE) and yellow index (YI) values of all samples were in the range of
and < 3.0, respectively.
Rheological Properties of Poly(lactic acid) Modified by Electron Beam Irradiation
Shin, Boo-Young ; Kim, Bong-Shik ;
Polymer Korea, volume 34, issue 5, 2010, Pages 485~489
Poly(lactic acid)(PLA) has been modified by electron radiation in the presence of 5 phr glycidyl methacrylate (GMA) to enhance the melt strength of PLA. The modified PLA was prepared by varying the dose of irradiation and was characterized by observing the thermal properties, the melt viscoelastic properties and the gel fraction. The irradiated PLA with 300 kGy in the presence of 5 phr GMA showed drastically improved complex viscosity and storage modulus properties: a complex viscosity of about 210 times higher and a storage modulus of 14500 times higher than those of virgin PLA when measured at a frequency of 0.1 rad/s. Gel fraction study revealed that a branching reaction was more dominant than a crosslinking reaction when the PLA was irradiated with less than 200 kGy.