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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
Preparation of Colored Electrophoretic Nanoparticles by Emusifier-Free Emulsion Polymerization and Reactive Dyeing
Chon, Jin-A ; Ha, Jae-Hee ; Lim, Min-Ho ; Kwon, Yong-Ku ;
Polymer Korea, volume 34, issue 6, 2010, Pages 491~494
Colored, electrophoretic polymer nanoparticles of poly (styrene-co-divinylbenzene-co-vinyl acetate)[poly(St-co-DVB-co-VAc)] were prepared by emulsifier-free emulsion co-polymerization and reactive dyeing. The emulsifier-free emulsion polymerization of styrene, divinyl benzene and vinyl acetate was carried out at
for 20 hrs to obtain monodisperse polymer nanoparticles of poly(St-co-DVB-co-VAc) with an average diameter of 180~200 nm. These nanoparticles were transformed into poly(styrene-co-divinylbenzene-co-vinyl alcohol) [poly(St-co-DVB-co-VA)] nanoparticles through the saponification reaction. The poly(St-co-DVB-co-VA) nanoparticles were treated with reactive dyes to obtain the colored, monodisperse electrophoretic nanoparticles, and their morphology and surface charge were characterized by scanning electron microscopy, differential scanning calorimetry, UV/Vis absorbance and zeta-potentiometry.
Colorless and Transparent Polyimide Films from Poly(amic acid)s with Cross-linkable Anhydride End
Min, Ung-Ki ; Chang, Jin-Hae ;
Polymer Korea, volume 34, issue 6, 2010, Pages 495~500
Crosslinked PI films were synthesized from 4,4'-(hexafluoro isopropylidene)diphthalic anhydride (6FDA) and bis[4-(3-aminophenoxy) phenyl] sulfone(BAPS) with various ratios of the reactive monomer cis-4-cyclohexene-1,2-dicarboxylic anhydride(CDBA). We prepared crosslinked poly(amic acid) (PAA) using a 0.1 wt% Grubbs catalyst as a crosslinking agent. The crosslinked PAA was heat-treated at different temperatures to give PI films. The thermo-mechanical properties and optical transparency of the PI films were investigated. The thermal properties of the PI films were examined using Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetry(DSC), thermogravimetric analysis(TGA), thermo-mechanical analysis(TMA), and universal tensile machine(UTM), and their optical transparencies were investigated using UV-vis. spectrophotometry. The thermomechanical properties of the PI films improved with increasing CDBA content. However, the optical transparency of the PI films decreased slightly with increasing CDBA content.
Novel Gene Delivery Carrier Using Chitosan-Lipoic Acid Comb-Type Copolymer
Kwon, Sang-Kyoo ; Kim, Sung-Wan ; Kim, Young-Jin ;
Polymer Korea, volume 34, issue 6, 2010, Pages 501~506
Natural chitosan has high molecular weight and the poor solubility in water. Water-soluble chitosan with low molecular weight was prepared by the hydrolysis method. In order to develop an efficient gene delivery carrier, chitosan was conjugated with lipoic acid to form the comb-type copolymer. The copolymer with the amphiphilic property formed the self-assembled nanoparticles in the aqueous solution. The average size of nanoparticles was 217.6 nm and the average size of nanoparticles/DNA complex was 170 nm. New chitosan-lipoic acid copolymer showed the low cytotoxicity and 10 times higher transfection efficiency than that of the pure chitosan.
Application of Polycarbonate Diol Prepared with Carbon Dioxide in the Field of Waterborne Polyurethane
Lim, Jae-Woo ; Oh, Hyoung-Jin ; Kim, Young-Jo ; Jeong, Kwang-Eun ; Yim, Jin-Heong ; Ko, Young-Soo ;
Polymer Korea, volume 34, issue 6, 2010, Pages 507~510
Poly(cyclohexane carbonate) diol was synthesized by the alternating copolymerization of cyclohexene oxide and
over Cr based transition metal catalysts. The prepared PCCD was applied as a precursor for the preparation of waterborne polyurethane (PUD) in order to investigate an application field of carbon dioxide-based polycarbonate. The scratch resistance and thermal properties of PUDs, which was prepared with two kinds of polymeric diols (PCD and PCCD) were investigated. The scratch resistance and thermal decomposition temperature of PUD film prepared with PCCD is worse than those prepared with PCD, poly(hexamethylene carbonate) glycol. While, glass transition temperature of PUD film prepared with PCCD was higher than that prepared with PCD. It might be due to the rigid cyclohexane structure in the PCCD.
The Electrodeposition on Carbon Materials with In Situ Electrochemical Polymerization of 3-Octylthiophene
Jeon, Jae-Sook ; Kim, Jeong-Jae ; Lee, Kyung-Woo ; Kim, Jeong-Soo ;
Polymer Korea, volume 34, issue 6, 2010, Pages 511~516
The electrochemical coating of poly(3-octylthiophene) on carbon materials was studied in order to investigate the application possibility of the modified carbon materials in the photoelectronic devices. Commercial carbon paper and carbon fiber were used as substrate electrodes for electrochemical coating. The coating behaviors were analysed with the variation of monomer and electrolyte concentration, applied potential, and cycling number in cyclovoltammetry. The coating rate of poly(3-octylthiophene) formed on the substrate were proportional to the monomer and electrolyte concentration, applied potential, and cycling number with each independent exponent. The structure and morphology of electrochemically polymerized poly(3-octylthiophene) was investigated with scanning electron microscopy and FTIR reflectance measurement.
Improvement of Thermal Stability of Polyethylene Lithium-ion Battery Separator via Coating with Polymers Synthesized from Bis-GMA Derivatives
Im, Hyun-Gu ; Hong, Ji-Hye ; Kim, Chang-Keun ;
Polymer Korea, volume 34, issue 6, 2010, Pages 517~521
Microprous polyethylene (PE) membranes are widely used as lithium-ion battery separators. A separator having higher meltdown temperature than PE separator is still required for useful safety feature at a high temperature. To enhance meltdown temperature of PE separator, it was coated with polymers synthesized from bis-GMA derivatives by radical polymerization. Polymer was not formed when bis-GMA monomer having a high viscosity was used, while polymers were formed when bis-GMA derivatives having a low viscosity were used. When the separator was coated with polymer synthesized from reaction mixture containing proper amount of bis-GMA derivative, its meltdown temperature were increased up to
without reduction in the air permeability.
Properties of Bacterial Cellulose Cultured in Different Carbon Sources
Park, Sang-Min ; Yoon, Sang-Jun ; Son, Hong-Joo ; Lee, Chung-Yeol ; Kim, Hong-Sung ;
Polymer Korea, volume 34, issue 6, 2010, Pages 522~526
Bacterial cellulose is produced by the bacterium Gluconacetobacter xylinus, which forms a nanofibrous pellicle in its culture medium. We studied properties of the bacterial cellulose such as crystallinity, viscosity, morphology, and mechanical properties according to the carbon source. Static cultures of Gluconacetobacter sp. V6 were performed in three kinds of media: standard Hestrin-Schramm medium, and modified medium with either glycerol or molasses as carbon sources. Cell growth and cellulose yield were increased in the glycerol and molasses media. The culture in the glycerol medium improved the physical properties of cellulose such as crystallinity, intrinsic viscosity, and breaking stress. However, the culture in the molasses medium decreased crystallinity, crystallite size, and intrinsic viscosity of cellulose. In summary, the cellulose yield was remarkably improved in the molasses medium, but with inferior structural properties.
Preparation and Characterization of Pioglitazone Loaded PLGA Nanospheres for the Treatment of Type 2 Diabetes
Woo, Hyun-Ju ; Kim, Jin-Soo ; Kim, Jun-Gi ; Nurunnabi, Md. ; Huh, Kang-Moo ; Cho, Kwang-Jae ; Lee, Yong-Kyu ;
Polymer Korea, volume 34, issue 6, 2010, Pages 527~533
The pioglitazone loaded poly(lactide-co-glycolide)(PLGA) nanospheres were prepared by emulsion-evaporation method and optimized for particle size and entrapment efficiency. The optimized particles were 125~170 nm in size with narrow size distribution and showed above 85% entrapment efficiency at 30% of pioglitazone loading when prepared with 3% w/v of poly(vinyl alcohol) (PVA) as a surfactant. These particulate carriers exhibited a controlled in vitro release of pioglitazone for 40 days at a nearly constant rate. The pioglitazone loaded PLGA nanospheres were not only effective to reduce the blood sugar level of diabetic rats but also non-toxic for the animal body, in particular for sensitive organs like kidney, liver, heart, lung and spleen. These results indicate that PLGA nanospheres have a great potential for oral delivery of pioglitazone.
Effect of Nanotube Length on Rheological Characteristics of Polystyrene/Multi-walled Carbon Nanotube Nanocomposites Prepared by Latex Technology
Woo, Dong-Kyun ; Noh, Won-Jin ; Lee, Seong-Jae ;
Polymer Korea, volume 34, issue 6, 2010, Pages 534~539
Polystyrene (PS)/multi-walled carbon nanotube (MWCNT) nanocomposites were prepared via latex technology and the effect of nanotube length on rheological properties were investigated. Monodisperse PS particle was synthesized by the emulsifier-free emulsion polymerization and two types of MWCNTs were used after surface modification to improve dispersion state and to remove impurities. Final nanocomposites were prepared by the freeze-drying process after dispersing the PS particles and the surface-modified MWCNTs in a ultrasonic bath. The effects of MWCNT content and nanotube length on rheological properties were evaluated by imposing the small-amplitude oscillatory shear flow. The PS/MWCNT nanocomposites showed that rheological properties were enhanced as the amount and length of MWCNT increased. It is speculated that the rheological characteristics of nanocomposites change from liquid-like to solid-like as the MWCNT amount increases, and the critical concentration to achieve network structure decreases as the nanotube length increases.
Preparation and Characterization of PVA/PSSA-MA Electrolyte Membranes Containing Silica Compounds and Surface Fluorination for Fuel Cell Applications
Kim, Dae-Hoon ; Lee, Bo-Sung ; Rhim, Ji-Won ;
Polymer Korea, volume 34, issue 6, 2010, Pages 540~546
In this manuscript, in order to reduce methanol permeability and, at the same time, to increase proton conductivity THS-PSA containing silica compound, responsible for methanol permeability reduction, and sulfonic acid, responsible for proton conductivity enhancement, was applied onto PVA/PSSA-MA membranes. And in order to improve durability, the resulting membranes, PVA/PSSAMA/THS-PSA, were exposed to 500ppm F2 gas at varying reaction times. The surface-fluorinated membranes were characterized through the measurement of contact angles, thermo-gravimetric analysis, and X-ray photoelectron spectroscopy to observe the physico-chemical changes. For the evaluation of the electro-chemical changes in the resulting membranes, its water contents, ion exchange capacity, proton conductivity, and methanol permeability were measured and then compared with the commercial membrane, Nafion 115. Finally, the membran electrode assembly(MEA) was prepared and the cell voltage against the current density was measured. As fluorination time increased, the contents of F2 increased up to maximum 4.3% and to depth of 50 nm. At 60 min of fluorination, the proton conductivity was 0.036 S/cm, larger than Nafion 115 at 0.024 S/cm, and the methanol permeability was
, less than Nafion 115 at
Synthesis and Characterization of High Molecular Weight Biodegradable Polyoxalate
Kim, Se-Ho ; Yoo, Han-Na ; Khang, Gil-Son ; Lee, Dong-Won ;
Polymer Korea, volume 34, issue 6, 2010, Pages 547~552
Biodegradable polymers have gained enormous attentions in the pharmaceutical and biomedical applications, especially in drug delivery. In this work, we report the synthesis and characteristics of high molecular weight polyoxalate with ~75000 Da. Hydrolytic degradation kinetics and degradation products were characterized by nuclear magnetic resonance and gel permeation chromatography. Polyoxalate is a semicrystalline and thermally stable polymer with a glass transition temperature of
, which is suitable for drug delivery applications. The hydrophobic nature of polyoxalate allows it to be formulated into nanoparticles and encapsulate drugs using a conventional oil-in-water emulsion/solvent displacement method. Polyoxalate nanoparticles also exhibited excellent cytotoxicity profiles. It can be suggested that polyoxalate has great potential for numerous biomedical and pharmaceutical applications.
Synthesis and Characterization of Conductive Polyaniline-Modified Polymers via Nitroxide Mediated Radical Polymerization
Jaymand, Mehdi ;
Polymer Korea, volume 34, issue 6, 2010, Pages 553~559
The paper describes the preparation and characterization of conductive polyaniline-modified polymers by growing of aniline onto functionalized poly(styrene-co-p-methylstyrene) [P(St-co-MSt)]. For this purpose, P(St-co-MSt) was synthesized via nitroxide mediated radical polymerization (NMRP) and then N-boromosuccinimide was used for introduction of bromine to the benzylic positions of copolymer. Afterwards, 1,4-phenylenediamine was linked to the brominated P(St-co-MSt) and functionalized copolymer
was prepared. The graft copolymerization of aniline monomers onto functionalized P(St-co-MSt) was initiated by oxidized phenylamine groups after addition of ammonium peroxydisulfate (APS), and p-toluenesulfonic acid-doped PANI was chemically grafted onto P(St-co-MSt) via oxidation polymerization. The obtained terpolymer was studied by FTIR and UV-Vis spectroscopy and its thermal behaviour were examined by DSC and TGA analyses. The conductivity of terpolymer was measured by four-point probe method and electroactivity was measured by cyclic voltammetry (CV). The solubility of P(St-co-MSt)-g-PANI was examined in common organic solvents.
Effect of Poly(vinyl alcohol) Adhesives on the Dimensional Stability of LCD Polarizer
Suh, Ju-Hee ; Shin, Jung-Woo ; Kim, Hyo-Kap ; Kim, Han-Sung ; Kim, Yong-Won ; Kang, Ho-Jong ;
Polymer Korea, volume 34, issue 6, 2010, Pages 560~564
Dimensional stability of LCD polarization film consisted of triacetyl cellulose (TAC) and poly(vinyl alcohol) (PVA) film has been studied and especially, the effect of PVA adhesive on the dimensional stability has been considered as function of deacetylation and molecular weight of PVA adhesive. The maximum adhesion strength between TAC and PVA film was obtained in the laminate using PVA adhesive with 70% of OH content and the effect of molecular weight on the adhesion strength was only pronounced in the laminate using PVA adhesive with OH content above 70%. It was found that the optimum dimensional stability of TAC/PVA/TAC laminate (polarizing film) was obtained when applied PVA adhesive has low molecular weight and it was more dependent upon the OH content than the adhesion strength between TAC and PVA films.
Preparation of IPN-type Polyelectrolyte Films Attached to the Electrode Surface and Their Humidity-Sensitive Properties
Han, Dae-Sang ; Gong, Myoung-Seon ;
Polymer Korea, volume 34, issue 6, 2010, Pages 565~573
Copoly(2-(dimethylamino)ethyl methacrylate)(DAEMA)/butyl acrylate (BA) and copoly(methyl methacrylate)(MMA)/BA/2-(cinnamoyloxy)ethyl methacryate (CEMA), which were cross-linked with dibromoalkane and UV irradiation, respectively, were prepared for the precursors of interpenetrating polymer network (IPN) humidity-sensitive films. 3-(Triethoxysilyl)propyl cinnamate (TESPC) was used as a surface-pretreating agent for the attachment of IPN-polyelectrolyte to the electrode surface by UV irradiation. Humidity sensitive polymeric thin films with an IPN structure were prepared by crosslinking reactions of copoly(DAEMA/BA) with 1,4-dibromobutane (DBB) and copoly(MMA/BA/CEMA) by UV-irradiation. The anchoring of an IPN-polyelectrolyte into the substrate was carried out via the photochemical
cycloaddition. The resulting humidity sensors showed a high sensitivity in the range of 20~95%RH and a small hysteresis (<1.5%RH). The response time for adsorption and desorption process at 33~94%RH was 48 and 65 s, respectively, indicating a fast response. The effects of the concentration of copolymers, molar ratio of crosslinking agents and time of the precursor solution for dip-coating on their humidity sensitive properties including water durability were investigated.
Synthesis and Cured Film Properties of UV-Curable Caprolactone-Modified Urethane Acrylate Oligomers
Kim, Jeong-Yeol ; Moon, Byoung-Joon ; Kang, Doo-Whan ; Hwang, Seok-Ho ;
Polymer Korea, volume 34, issue 6, 2010, Pages 574~578
In this study, the caprolactone modified hydroxy acrylates (CHAs) were synthesized by ring-opening reaction of caprolactone and 2-hydroxyethyl acrylate (2-HEA) as initiator. Also, the caprolactone modified urethane acrylate (UA) oligomers were synthesized by condensation reaction of previously synthesized CHAs, 2-hydroxyethyl acrylate (2-HEA) and hexamethylene diisocyanate trimer (HDT). Using the hydroxy number of CHAs, the molecular weights of the CHAs were calculated easily and their molecular weight was similar to the theoretical molecular weight of them. The viscosity of UA oligomers decreased as increasing a content of CHA in the UA oligomer. Cure films were prepared from UA oligomer, reactive diluents, and UV initiator to investigate their physical properties. The thermal stability and color difference on high temperature for the cured film were improved as increasing the crosslinking density. Their surface hardness was also increased as increasing crosslinking density of the cured films, but their elongation at break was decreased.
Investigation of Properties of the PET Film Dependent on the Biaxial Stretching
Lee, Jung-Gyu ; Park, Sang-Ho ; Kim, Seong-Hun ;
Polymer Korea, volume 34, issue 6, 2010, Pages 579~587
To investigate the properties of PET films, PET films were extruded at various temperature above
and quenched at
for amorphous sheet, and stretched along a direction defined as the machine direction (MD) with a transverse direction (TD) above
at various stretching ratios and then annealed at various temperatures produced by SKC PET line. Thermal shrinkage of MD and TD increased with decreasing annealing temperature and extruding temperature, and increasing stretching ratio. The degree of crystallinity, density, heat of fusion (
) and pre-melting point (
) increased with increasing annealing temperature and extruding temperature. Number average molecular weight (
) and intrinsic viscosity decreased with increasing extruding temperature. Tensile strength and modulus increased with increasing stretching ratio, however decreased with increasing annealing temperature. Reflective index of both stretching and thickness direction increased with increasing stretching ratio and annealing temperature.
Synthesis of Polyacrylates Containing Si, Ge and Sn for High Refractive Index
Maheswara, Muchchintala ; Do, Jung-Yun ;
Polymer Korea, volume 34, issue 6, 2010, Pages 588~593
New seven acrylic monomers with covalently bonded silicon, germanium, and tin were prepared for high refractive index materials. The monomers were copolymerized with a cross-linkable comonomer (Trimer) to prepare UV-films for optical characterization. The refractive index of the copolymers increased in proportion to the monomer content and extrapolated to determine that of homopolymer.
groups contributed to increase the refractive index of acrylic polymer, in which
was more effective than
. The index increment confidently occurred with
attachment in comparison with aliphatic acrylic polymers.
-attached acrylate polymer showed a refractive index of 1.671 at 589 nm. The index change was similarly observed at various different wavelengths (656, 830, 1310, and 1550 nm).