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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 35, Issue 6 - Nov 2011
Volume 35, Issue 5 - Sep 2011
Volume 35, Issue 4 - Jul 2011
Volume 35, Issue 3 - May 2011
Volume 35, Issue 2 - Mar 2011
Volume 35, Issue 1 - Jan 2011
Selecting the target year
Improved Pyroelectric Characteristics of 0~3
/P(VDF/TrFE) Composites Films for Infrared Sensing
Kwon, Sung-Yeol ;
Polymer Korea, volume 35, issue 5, 2011, Pages 375~377
/P(VDF/TrFE) 0~3 composites thin films with 0.10 and 0.13 of ceramic volume fraction factor have been fabricated by two-step spin coating technique and analyzed. 0~3 connectivity of
/P(VDF/TrFE) composites film was observed successfully by SEM micrography. The SEM picture confirmed 0~3 connectivity. And, in all the properties, 0~3
/P(VDF/TrFE) composites film was superior to P(VDF/TrFE) copolymer. Therefore, with a good low-dielectric constant and a high pyroelectric coefficient, the composite thin films can be used for a new pyroelectric infrared sensor of higher performance.
Preparation and Characterization of Silk Fibroin/Gelatin Hybrid Scaffolds
Kim, Hye-Lin ; Hong, Min-Sung ; Kim, Su-Jin ; Jo, Han-Su ; Yoo, Il-Sou ; Lee, Dong-Won ; Khang, Gil-Son ;
Polymer Korea, volume 35, issue 5, 2011, Pages 378~384
Silk fibroin is a biocompatible and slowly biodegradable natural polymer. This natural polymer has excellent mechanical properties, non-toxicity, and non-immunogenic properties and has been demonstrated to support tissue regeneration. Also, gelatin is a natural material derived from collagen by hydrolysis and has an almost identical composition as that of collagen. Silk fibroin/gelatin scaffolds have been fabricated by using the freeze-drying method. To establish the scaffold manufacturing condition for silk fibroin and gelatin, we made scaffolds with various compositions of gelatin, glutaldehyde and silk fibroin. The silk fibroin/gelatin scaffolds were characterized using SEM, DSC, and water absorption ability tests. The cellular proliferation was evaluated by WST assay. These results suggested that a scaffold containing 8% of gelatin, 1% of glutaldehyde and 0.3 g of silk fibroin provided suitable characterstics for cell adhesion and proliferation. In conclusion, the silk fibroin/gelatin scaffold may serve as a potential cell delivery vehicle and a structural basis for tissue engineering.
Analysis of Properties of Rubbed Polyimide Alignment Layer and Rubbing Effect of Various Rubbing Cloths for LCD Fabrication
Ahn, Hong-Jun ; Lee, Jang-Ju ; Ahn, Jong-Soo ; Park, Kyung-Chul ; Noh, Jae-Gyu ; Yoo, Dong-Yeon ; Paek, Sang-Hyon ;
Polymer Korea, volume 35, issue 5, 2011, Pages 385~389
In rubbing process, process factors, the properties of alignment layer and the physical properties of rubbing cloth have acted as important variables. These factors affect the orientation properties of the alignment layer by rubbed extent that is determined by rubbing density and rubbing force. In this work, we studied the effects of rubbing cloths with different pile density and rigidity on rubbing density(length) and rubbing force. As the pile density and rigidity of rubbing cloths increased, the birefringence and the surface roughness of the rubbed alignment layers became bigger, but the characteristics of rubbing-effect had differed each other. The pile density of rubbing cloths which was related with the number of pile, affected the rubbing density(length). On the other hand, the pile rigidity of rubbing was closely related to rubbing force rather than the rubbing density(length).
Preparation of Poly(vinyl acetate)/Silver Hollow Microspheres via Suspension Polymerization
Yeum, Jeong-Hyun ;
Polymer Korea, volume 35, issue 5, 2011, Pages 390~394
Effects of silver nanoparticles on the polymerization rate and morphology of poly(vinyl acetate) (PVAc)/silver microspheres prepared by suspension polymerization of VAc were investigated. Scanning electron microscopy, transmission electron microscopy, X-ray diffraction and atomic absorption spectrometry were used to characterize the morphology and properties of the PVAc/silver microspheres. Due to the change of hydrophilicity of silver nanoparticles, appearance of the microspheres having golf ball-like convave surfaces was observed. Under controlled concentration of surfactant, PVAc/silver microspheres with various hollow structures were synthesized. In the case of silver nanoparticles modified by surfactant, the polymerization rate increased slightly. PVAc/silver microspheres with a conversion up to 80% were prepared via suspension polymerization.
Characterization of Acrylic Polymer-Grafted MWNTs Prepared by Atom Transfer Radical Polymerization
Joo, Young-Tae ; Jung, Kwang-Ho ; Kim, Yang-Soo ;
Polymer Korea, volume 35, issue 5, 2011, Pages 395~401
MWNT/PMMA and MWNT/PDMAEMA nanocomposites were prepared using an atom transfer radical polymerization (ATRP). The FTIR and XRD analysis results showed that the nanocomposites were composed of MWNTs grafted by either PMMA(PMMA-g-MWNTs) or PDMAEMA(PDMAEMA-g-MWNTs). A controlled living radical polymerization of ATRP was characterized by the thermogram analysis for the nanocomposites. The morphologies of prepared nanocomposites were analyzed by transmission electron microscopy. Raman analysis results for the nanocomposites showed that there occurred covalent bonding between acrylic polymers and MWNTs.
Characterizations of Flexible Clay-PVA Hybrid Films: Thermo-optical Properties, Morphology, and Gas Permeability
Shin, Ji-Eun ; Ham, Mi-Ran ; Kim, Jeong-Cheol ; Chang, Jin-Hae ;
Polymer Korea, volume 35, issue 5, 2011, Pages 402~408
-saponite(SPT) film flexibility, we prepared SPT hybrid clay films with various poly(vinyl alcohol) (PVA) concentrations(0~10 wt%) using the solution intercalation method. In this study, we investigated the thermo-optical properties, morphology, and gas permeability of the SPT hybrid films. We also examined the relationship between the film properties and PVA content using wide angle X-ray diffraction measurements(XRD), field emission scanning electron microscopy(FESEM), differential scanning calorimetry(DSC), thermogravimetric analysis(TGA), thermomechanical analysis(TMA), ultraviolet-visible(UV-vis) spectroscopy, and oxygen transmission rate(
TR) testing. The properties of the clay hybrid films were strongly affected by PVA filler content. The presence of a small amount of PVA was sufficient to improve the flexibility of SPT hybrid films.
Synthesis of Novel Silicone Containing Vinylic Monomer and Its Uses in the Waterborne Polyurethane-Veova/Vinyl Acetate Hybrid Emulsion Copolymers
Naghash, Hamid Javaherian ; Naeni, Elham Kasaeian ;
Polymer Korea, volume 35, issue 5, 2011, Pages 409~418
A novel silicone (Si) containing vinylic monomer, N-(3-(triethoxysilyl)propyl) methacrylamide (TESPMA), based on 3-aminopropyltriethoxysilane (APTES) and methacryloyl chloride (MCl) has been synthesized for formulation of waterborne polyurethane (WPU). Two types of vinyl group containing Si, methacryloxypropyltriethoxysilane (MPTES) and triethoxyvinylsilane (TEVS), have been used as coupling reagents for comparison of the effects of Si kinds with TESPMA on the WPU. A series of new siliconized WPU, vinyl acetate/vinyl ester of versatic acid (VAc-Veova), TESPMA, MPTES and TEVS hybrid latexes have been successfully prepared by emulsion polymerization in the presence of WPU dispersion.
Antibacterial Activity of Low Molecular Weight Water-Soluble Chitosan
Park, Yoon-Kyung ; Nah, Jae-Woon ;
Polymer Korea, volume 35, issue 5, 2011, Pages 419~423
Chitosan is a natural polymer derived from chitin that has been widely used as a dietary supplement and in a variety of pharmacological and biomedical applications. In addition, water-soluble chitosan has been used to enhance the stability of chitosan in water and reduce cytotoxic activity induced by acetic acid. In this study, the antibiotic activity and mechanism of low molecular weight water-soluble chitosan (LMWSC; MW1, MW3, MW5, and MW10) were examined in pathogenic bacteria cells and vesicles containing bacterial membrane lipids. MW10 displayed potent antibacterial activity against pathogenic bacteria strains and no cytotoxicity against mammalian cells. In addition, the degree of calcein leakage was examined as a function of lipid composition (PE/PG=7/3 w/w). The results of these experiments demonstrated that MW10 promoted leakage in negatively-charged membranes. Furthermore, confocal microscopy revealed that MW10 was located in the plasma membrane.
Fabrication of Biodegradable Polyphosphazene Microparticles by Electrohydrodynamic Atomization
Xue, Li-Wei ; Cai, Qing ; Ryu, Seung-Kon ; Jin, Ri-Guang ;
Polymer Korea, volume 35, issue 5, 2011, Pages 424~430
Biodegradable poly[(glycine ethyl ester)-(phenylalanine ethyl ester) phosphazene](PGPP) microparticles were fabricated by electrohydrodynamic atomization to apply drug release test. Atomization parameters such as applied voltage, polymer concentration, and molecular weight were investigated to inspect their effects on the size and morphology of microparticles. The average diameter of PGPP microparticles decreased as increasing applied voltage and solution flow rate. Dichloromethane/dioxane mixture shows better results for the preparation of microparticles than single solvent owing to the different PGPP solubility in solvent. Blending PGPP polymers with proper molecular weights not only favored the production of spherical PGPP microparticles via electrohydrodynamic atomization, but also provided a way to adjust drug (rifampicin) release behavior. Drug-loaded biodegradable polyphosphazene microspheres can be fabricated via electrohydrodynamic atomization, which has potential use in biomedical applications.
Synthesis of Phosphoric Polymer Coating Solution with Antimicrobial Activity and Flame Retardant Efficiency
Kim, Sang-Kyum ; Lee, In-Soo ; Seo, Sang-Hee ; Choi, Seong-Ho ;
Polymer Korea, volume 35, issue 5, 2011, Pages 431~437
A polymeric coating solution based on poly(acryloyl diphosphoric acid)(poly(ADP)) was prepared via a radical polymerization of acryloyl diphosphoric acid using ammonium persulfate (APS) as an initiator in water at 70
. The prepared polymeric coating solution exhibited significant antibacterial activity against salmonella typhimurium, pseudomonas aeruginosa, escherichia coli, and staphylococcus aureus. It also exhibited good antifungal activity against Asperigillus niger and good antiviral activity against the influenza (H1N1) virus. Additionally, it exhibited good flame retardant efficiency after applying it as a coating to a cotton fabric.
Enhancement of Membrane Performance through Surface Hydrophilization of Hydrophobic Porous Flat-sheet Membranes
Kim, Baek-Ahm ; Lee, Hak-Min ; Lee, Bo-Seong ; Kim, Sung-Pyo ; Cheong, Seong-Ihl ; Rhim, Ji-Won ;
Polymer Korea, volume 35, issue 5, 2011, Pages 438~443
In order to enhance water permeability through the improvement of fouling phenomena and wettability of hydrophobic porous membranes, various adsorption materials, i.e., poly(vinyl amine), poly (styrene sulfonic acid), poly(vinyl sulfonic acid), and poly(acrylamide-co-acrylic acid) were adsorbed onto the surface of polyethylene (PE) porous membrane. The concentration of adsorption solutions, adsorption time, the sort of salts and their ionic strength were varied, and the pure water permeability of their resulting adsorbed membranes was measured. In general, water permeability increased with an initial increase in the concentration of adsorption solution, adsorption time, and ionic strength and then decreased with a further increase. The pure water permeability of 375
(LMH), 35% enhancement, was obtained at a condition of poly(vinyl sulfonic acid) 1000 ppm,
ionic strength(IS) 0.1, and adsorption time 150 sec, while the 50% (411 LMH) and 35% (374 LMH) enhancements were obtained at conditions of poly(styrene sulfonic acid) 1000 ppm, adsorption time 60 sec, and NaCl IS 0.1 and 0.2, respectively.
Depolymerization of Alginates by Hydrogen Peroxide/Ultrasonic Irradiation
Choi, Su-Kyoung ; Choi, Yoo-Sung ;
Polymer Korea, volume 35, issue 5, 2011, Pages 444~450
A high molecular weight natural sodium alginate (HMWSAs) was depolymerized by hydrogen peroxide (
) with ultrasonic irradiation. The effects of the reaction conditions such as reaction temperature, reaction time, hydrogen peroxide concentration and ultrasonic irradiation time on the molecular weights and the end groups of the depolymerized alginates were investigated. It was revealed that depolymerization occurred through the breakage of 1,4-glycosidic bonds of sodium alginate and the formation of formate groups on the main chain under certain conditions. The changes in molecular weight were monitored by GPC-MALS. The molecular weight of 2 wt% alginate solution decreased from 450 to 15.9 kDa for 0.5 hrs at 50
under an appropriate ultrasonic irradiation. The PDI(polydispersity index)s of the alginate depolymerized in this study were considerably narrow in comparison with those obtained from the other chemical degradation method. The PDIs were in the range of 1.5~2.5 in any reaction conditions employed in this study.
Effect of Latex Particle Size on Rheological and Electrical Properties of Polystyrene/Multi-Walled Carbon Nanotube Nanocomposites
Kang, Myung-Hwan ; Noh, Won-Jin ; Lee, Seong-Jae ;
Polymer Korea, volume 35, issue 5, 2011, Pages 451~457
The effect of latex particle size on rheological and electrical properties of latex-blended polystyrene (PS)/multi-walled carbon nanotube (MWCNT) nanocomposites was investigated. Mono-dispersed PS particles synthesized either by emulsifier-free emulsion polymerization or by dispersion polymerization were mixed with MWCNTs under ultrasonication, and freeze-dried to prepare the nanocomposites. As the MWCNT content increased, storage modulus, complex viscosity and electrical conductivity were substantially increased. The increase of storage modulus and complex viscosity was higher for larger PS particles. The effect of particle size on electrical properties was different depending on MWCNT content. With lower MWCNT content, the nanocomposite prepared by smaller PS particles showed higher electrical conductivity, but the opposite result was given as the content increased.
Preparation and Polarization Properties of Poly(vinyl alcohol) Polarizing Film Using the Mixed System of Supercritical
/Organic Solvents/Dichroic Dye
Park, Ki-Sang ; Choi, E-Joon ; Chang, Jin-Ho ; Park, Il-Hyun ;
Polymer Korea, volume 35, issue 5, 2011, Pages 458~466
In the mixed system of supercritical carbon dioxide/organic solvents, poly(vinyl alcohol)(PVA) film of high degree of hydrolysis could be dyed with a dichroic dye of C. I. direct black 22(DB22) and as a result, high durability was obtained. Especially, as a dye dispersant in a supercritical fluid phase, a mixed solvent system of ethylene glycol: dimethyl sulfoxide=4 : 6 weight ratio was investigated. Then the optimum pressure for dyeing could be reduced down to 200 bar. Using this supercritical fluid system, the maximum dyeing appeared as the transmittance of less than 1% and the waste amount was reduced to the level of 1/10. After 500% drawing of this PVA film, both the polarizing efficiency of 94% and the single piece transmittance of 30% were obtained. The limitation of DB22 and further improvements were also discussed.
Investigation of the Molding Conditions to Minimize Residual Stress and Shrinkage in Injection Molded Preform of PET Bottle
Cho, Sung-Hwan ; Hong, Jin-Su ; Lyu, Min-Young ;
Polymer Korea, volume 35, issue 5, 2011, Pages 467~471
PET bottle is manufactured by blow molding the preform, which is molded by injection molding. The neck part of the preform of PET bottle for juice or grain-based beverage is crystallized before blowing to improve heat resistance at the entrance of the bottle. However, residual stress, developed during injection molding of preform, prevents the crystallization. In order to release the residual stress in the preform, the preform is annealed after the injection molding. If the residual stress is reduced by optimizing the injection molding conditions of preform the annealing time would be shortened. In this study, the optimum conditions for minimizing the residual stress and increasing dimensional accuracy of the injection molded preform are suggested through CAE analysis. In order to optimize the molding conditions, minimizing residual stress and shrinkage, computer simulations have been carried out with help of design of experiment scheduling. Injection temperature, initial packing pressure and filling time were selected for control parameters. Residual stress was affected by injection temperature and filling time. Shrinkage was affected by injection temperature. It was found that maximum residual stress, distribution of residual stress and shrinkage were decreased by 22%, 40% and 25%, respectively at an optimum molding condition compared with the results of previous molding condition.
Effect of Carboxylic Acid Group of Functionalized Carbon Nanotubes on Properties of Electrospun Polyacrylonitrile (PAN) Fibers
Park, Ok-Kyung ; Kim, Ju-Hyung ; Lee, Sung-Ho ; Lee, Joong-Hee ; Chung, Yong-Sik ; Kim, Jun-Kyung ; Ku, Bon-Cheol ;
Polymer Korea, volume 35, issue 5, 2011, Pages 472~477
To study the effects of the acid group of functionalized MWNT (multiwalled carbon nanotube) on the thermal and mechanical properties of polyacrylonitrile(PAN) nanofibers, acid (
) treated MWNT (O-MWNT) were further functionalized by diazonium salt reaction with 5-aminoisophthalic acid (IPA). Compared to O-MWNT, IPA-MWNT with isophthalic acid group showed a better dispersion stability in polar solvents and IPA-MWNT/PAN composite film displayed lower heat of reaction (
) than that of homo PAN when stabilized under air atmosphere. The continuous electrospun fibers were prepared using a conductive water bath. PAN fibers containing 1 wt% of IPA-MWNT showed an increase of tensile strength by 100% and tensile modulus by 240% compared to the PAN fibers without IPA-MWNT.
Preparation of Poly(styrene-co-(trimethoxysilyl)propyl methacrylate)-grafted ETFE Films by a Simultaneous Irradiation Grafting Method
Sung, Hae-Jun ; Sohn, Joon-Yong ; Song, Ju-Myung ; Shin, Jun-Hwa ; Nho, Young-Chang ;
Polymer Korea, volume 35, issue 5, 2011, Pages 478~482
In this study, several poly(styrene-co-(trimethoxysilyl)propyl methacrylate)-grafted ETFE films were prepared by a simultaneous irradiation grafting method. After mixing of styrene/(trimethoxysilyl)propyl methacrylate(TMSPM) monomers with various solvents, the effects of various irradiation conditions such as total dose, dose rate and monomer concentration on the degree of grafting of the prepared membranes were investigated. Results indicated that the higher degree of grafting was obtained when acetone was used as a solvent. The formation of poly(styrene-co-TMSPM) grafts on the ETFE films was verified using FTIR spectrometry and the distribution of the poly(PTMSPM) graft polymer over the cross-section of the grafted film was confirmed using SEM-EDX instrument.
Development of Polymeric Coating Material for Effective Drug-eluting Stent
Park, Tae-Hyun ; Jo, Eun-Ae ; Na, Kun ;
Polymer Korea, volume 35, issue 5, 2011, Pages 483~487
For the preparation of effective non-vascular drug eluting stent (DES), pullulan acetate (PA) was investigated as a coating material for polytetrafluorethylene (PTFE)-covered stent. PA was coated on PTFE-covered stent (PTFE-stent) by dip coating technique, and then its surface morphology, drug release behavior and cellular toxicity were tested. Field emission-scanning electron microscopy (FE-SEM) result indicated that its surface was smoother after PA coating without any cracking. The sustained release behavior of paclitaxel from PA-coated PTFE membrane was observed for 80 days. Also, the biological stability of paclitaxel in the membrane was confirmed by annexin V binding assays. Furthermore, the antitumor activity was demonstrated by an in vivo test against CT-26 murine colorectal tumors. From the results, we concluded that PA was expected as a useful coating material to design an effective non-vascular DES.
Preparation and Characteristics of Polyurethane Hybrid Sealant Modified with Polydimethylsiloxane
Kang, Doo-Whan ; Park, Seung-Woo ;
Polymer Korea, volume 35, issue 5, 2011, Pages 488~492
Three isocyanatopropyldimethoxysilylpolydimethylsiloxanes(IDMSi-PDMS) were synthesised from the reaction of isocyanatopropyltrimethoxysilane with monohydroxyl group termainated PDMS having different molecular weight(
=5000, 10000, and 20000). Then PDMS modified polyurethane hybrid elastomer(PSMPH) were prepared from the reaction of IDMSi-PDMS with
-hydroxyl group terminated polyurethane. PSMPH sealant was prepared by compounding PSMPH elastomer with additives such as plasticizer, adhesion promoter, crosslinking agent, vicosity increasing agent, inorganic filler, and catalyst at room temperature under nitrogen atmosphere. The methoxy group in the PSMPH sealant should be crosslinked with the hydroxyl group in the building stone or moisture by typical sol-gel reaction. The adhesive strength of the sealant having PDMS of
=5000 showed 40.28 kg of maxium load and 20.14 kg of break load. The shrinkage rate of the sealant having PDMS of
=20000 was 5.7% as the best result. Also, their skin over time, slump, oil content after 8 days under oil soaked paper and alkaline resistance characteristics show good results.
Molecular Orientation and Optical Properties of Liquid Crystal Mixture Films of Photo-Reactive Mesogens and Non-Reactive Nematic Liquid Crystals
Lee, Mong-Ryong ; Shin, Mi-Young ; Kim, Sung-Hyun ; Song, Ki-Gook ;
Polymer Korea, volume 35, issue 5, 2011, Pages 493~498
Reactive mesogens were used to prepare photo-cured liquid crystal films in which orientations of liquid crystal molecules were preserved by crosslinked networks of cured reactive mesogens. The molecular orientations of liquid crystal mixtures of photo-reative mesogens and non-reactive nematic liquid crystals were studied and compared before and after curing reactions. The effects of temperature and the amount of the non-reactive nematic liquid crystal in the mixture on birefringence of the liquid crystal films were investigated. It was found that optical compensation films with different birefringence could be prepared by controlling the amount of the nematic liquid crystals in the reactive mesogen mixtures.