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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal Basic Information
Journal DOI :
The Polymer Society of Korea
Editor in Chief :
Volume & Issues
Volume 37, Issue 6 - Nov 2013
Volume 37, Issue 5 - Sep 2013
Volume 37, Issue 4 - Jul 2013
Volume 37, Issue 3 - May 2013
Volume 37, Issue 2 - Mar 2013
Volume 37, Issue 1 - Jan 2013
Selecting the target year
Control of Generation of Chlorine Dioxide Gas Using Polymer Hydrogels Containing Acetic Acid
Lee, Dong-Han ; Lee, Ook ;
Polymer Korea, volume 37, issue 5, 2013, Pages 553~556
DOI : 10.7317/pk.2013.37.5.553
Chlorine dioxide gas has an excellent ability for sterilization and deodorization, and is harmless to humans. However, it is very unstable and explosive as it is highly concentrated, thus its use in the air clean fields has been limited. Therefore, there is need to control chlorine dioxide gas at a low concentration for a long time. Chlorine dioxide gas could be produced slowly and sustainedly since the release of acetic acid from the polymer hydrogels delayed the reaction between acetic acid and sodium chlorite. In addition, as the amount of both acetic acid sodium chlorite loaded within the hydrogel and on the membrane increased, respectively, the generation amount of chlorine dioxide gas increased. The result shows that the use of polymer hydrogels has the potential to control the generation of chlorine dioxide gas.
Mechanical Properties of Low Temperature and Fast Cure Epoxy with Various Mercaptans
Kim, Won Young ; Eom, Se Yeon ; Seo, Sang Bum ; Lee, Kee Yoon ;
Polymer Korea, volume 37, issue 5, 2013, Pages 557~562
DOI : 10.7317/pk.2013.37.5.557
The thermal expansion and mechanical properties of diglycidyl ether of bisphenol A (DGEBA) with mercaptan hardeners were studied by a comparative method with an amine-adduct type hardener. Thermal expansion and dynamic mechanical properties were measured by thermo mechanical analysis (TMA) and dynamic mechanical ananlysis (DMA), respectively. The
and the coefficient of thermal expansion (CTE) of epoxy/amine-adduct type hardener system were
, respectively. As the number of -SH functional group of mercaptan hardener increased, the
rapidly decreased and gradually increased up to ca.
and the CTE under the
rapidly increased to ca. 200
and decreased to ca. 100
. The crosslinking density of epoxy with amine-adduct type hardener was ca.1.5
, while that of epoxy with mercaptan hardeners increased from 1.0 to 1.7
, as the number of -SH functional group increased. The storage modulus can increase up to 2700MPa at
Preparation of Syndiotactic Poly(vinyl alcohol) Microfibrils with Radiopaque Inorganic Particles
Jo, Hye Won ; Cha, Jin Wook ; Han, Sung Soo ; Lee, Joon Seok ; Oh, Tae Hwan ;
Polymer Korea, volume 37, issue 5, 2013, Pages 563~570
DOI : 10.7317/pk.2013.37.5.563
Poly(vinyl pivalate) (PVPi) was bulk polymerized to make poly(vinyl alcohol) (PVA) microfibrils to apply for polymeric embolization coils replacing metalic coils. Then, syndiotactic PVA (s-PVA) microfibrils having number-average degree of polymerization of 1100 and s-diad content of 60.4% were prepared via saponification of the PVPi with no separate spinning process. To make s-PVA microfibrils with radiopacity, zirconium dioxide (
) and barium sulfate (
) were added into s-PVA microfibrils during saponification. The computed tomography (CT) value indicating radiopacity reached up to over 1000 when the amount of
were 12 and 6 wt%, respectively.
Preparation of EPDM/Polyamide12 Elastomers through Electron Beam Irradiation
Jung, Hyo Shin ; Park, Jung Il ; Kang, Phil-Hyun ; Choi, Myung Chan ; Chang, Young-Wook ; Hong, Sung Chul ;
Polymer Korea, volume 37, issue 5, 2013, Pages 571~578
DOI : 10.7317/pk.2013.37.5.571
Polyamide12 (PA12) is blended with ethylene propylene diene rubber (EPDM) at various compositions in the presence of maleated EPDM (mEPDM) to afford blend materials having the characteristics of thermoplastic elastomer (TPE). The EPDM/PA12 melt-blends are further irradiated with electron-beam (e-beam) at 0~100 kGy dosage, yielding selective crosslinking between EPDM chains while retaining melt-processibility originated from PA12 phase. mEPDM acts as a compatibilizer and affords additional improvements in mechanical properties of the EPDM/PA12 blend. With 25 kGy of e-beam irradiation and mEPDM, the EPDM/PA12 blends successfully exhibit TPE behaviors with reasonable elastomeric and mechanical properties.
Thermal Property, Morphology, Optical Transparency, and Gas Permeability of PVA/SPT Nanocomposite Films and Equi-biaxial Stretching Films
Ham, Miran ; Kim, Jeong-Cheol ; Chang, Jin-Hae ;
Polymer Korea, volume 37, issue 5, 2013, Pages 579~586
DOI : 10.7317/pk.2013.37.5.579
Poly(vinyl alcohol)(PVA) nanocomposite films containing various saponite (SPT) clay contents were synthesized using a solution intercalation method. The thermal property, morphology, optical transparency, and gas permeability of the PVA nanocomposite films with various SPT contents in the range of 0 to 10 wt% were examined. PVA nanocomposite film containing 5 wt% SPT showed excellent thermal and gas barrier property. The hybrid films containing 5 wt% SPT were equibiaxially stretched with stretching ratios ranging from 150 to 250%. The clay dispersion, optical transparency, and gas permeability were also examined as a function of equibiaxial stretching ratio. The PVA nanocomposite films with various equibiaxial stretching ratios showed excellent optical transparency and barrier to oxygen permeability.
Improvement of Physicochemical Properties of Waterborne Polyurethane/Poly(3,4-ethylenedioxythiophene) Hybrid Thin Films
Ko, Young Soo ; Yim, Jin-Heong ;
Polymer Korea, volume 37, issue 5, 2013, Pages 587~591
DOI : 10.7317/pk.2013.37.5.587
Poly(3,4-ethylenedioxythiophene) (PEDOT) has good properties such as high conductivity, optical transmittance, and chemical stability, while offering relatively weak physicochemical properties. The main purpose of this paper is the improvement of physicochemical properties such as solvent resistance and pencil hardness of PEDOT. Carboxyl groups in the anionic type waterborne polyurethane (WPU) chains can effectively crosslink each other in the presence of aziridine, resulting in physicochemically robust PEDOT/WPU organic-organic hybrid conductive thin films. The electrical conductivity, optical properties, and physicochemical properties of the hybrid conductive film were compared by varying the solid content and WPU portion in the coating precursor solution. From the results, the transparency and surface resistance of the hybrid film show a decreasing tendency with increasing solid content in the coating precursor. Moreover, solvent resistance and hardness were dramatically enhanced by hybridization of PEDOT and crosslinked WPU due to curing reactions between carboxyl groups.
Influence of the Pore Properties on Carbon Dioxide Adsorption of PAN-based Activated Carbon Nanofibers
Lee, Dayoung ; Cho, Seho ; Kim, Yesol ; Lee, Young-Seak ;
Polymer Korea, volume 37, issue 5, 2013, Pages 592~599
DOI : 10.7317/pk.2013.37.5.592
In this study, polyacrylonitrile (PAN)-based porous carbon nanofibers were prepared from PAN polymer solution by electrospinning and KOH activation with various concentrations, and the characterization of pore structures and carbon dioxide adsorption was investigated. Manufactured PAN-based activated carbon nanofibers tend to decrease diameter and increase surface oxygen functional groups depending on the increasing concentration of KOH solution. In addition, according to the results of nitrogen adsorption for pore properties analysis, it indicated increase of the specific surface area in conformity with increasing concentration of KOH solution. Micropore volume of treated activated carbon nanofibers (ANCF) by 4 M KOH was the largest compared with other samples and mesopore volume of treated ANCF by 8 M KOH was the largest volume, respectively. The concentration of KOH effects textural and surface properties, as represented by BET and XPS, which enhance carbon dioxide adsorption capacity at 0 and
Polymerization of L-lactide Using Organometallic Aluminium Compound Supported inside Nanopores of Silica
Yim, Jin-Heong ; Ko, Young Soo ;
Polymer Korea, volume 37, issue 5, 2013, Pages 600~605
DOI : 10.7317/pk.2013.37.5.600
In this study, the bulk polymerizations of L-lactide were carried out with triethylaluminium (TEAL), which was supported inside of the nanopore of silica. The feed amount of TEAL in the feed, the immobilization time and temperature were changed to observe the effect of immobilization condition on the polymerization performance with the silica- supported TEAL. As the feed amount of TEAL increased, the conversion of polymerization increased. The highest molecular weight (MW) was achieved at 8 mmol/g-silica of TEAL. Hexane and toluene as solvents were employed to investigate the effect of temperature on the immobilization. Hexane showed better efficiency of immobilization TEAL and the immobilization temperature at
showed the highest conversion and MW.
Ring-Opening Polymerization of L-lactide with Glycidol as Initiator
Yim, Jin-Heong ; Kim, Da Hee ; Ko, Young Soo ;
Polymer Korea, volume 37, issue 5, 2013, Pages 606~612
DOI : 10.7317/pk.2013.37.5.606
Glycidol-poly(lactide) (Gly-PLA) were synthesized via L-lactide ring opening polymerization with glycidol as an initiator and
catalyst. The structure of Gly-PLA was analyzed and successfully confirmed by 1H NMR. The OH group of glycidol in Gly-PLA was absent according to the
NMR analysis, indicating that the terminal OH group of glycidol successfully served as an initiator in the L-lactide polymerization. The solution and bulk polymerizations of L-lactide with glycidol were performed to examine the effect of L-lactide/glycidol molar ratio, polymerization temperature and time on the molecular characteristics of Gly-PLA. The conversion and molecular weight increased with an increase in L-lactide/glycidol molar ratio. Gly-PLA showed the bimodal type DSC curve. The low
peak of low molecular weight reduced but the high
peak of high molecular weight increased as L-lactide/glycidol molar ratio increased.
Nano-Kenaf Cellulose Effects on Improved Mechanical Properties of Polypropylene Composite
Oh, Jeong Seok ; Lee, Seong-Hoon ; Bumm, Sughun ; Kim, Kwang-Jea ;
Polymer Korea, volume 37, issue 5, 2013, Pages 613~617
DOI : 10.7317/pk.2013.37.5.613
The effects of nano size kenaf cellulose fiber on mechanical property of polypropylene (PP) composite were investigated. The addition of nano-kenaf in place of natural kenaf showed higher tensile strength, flexural strength, impact strength, and heat deflection temperature compared to the natural kenaf filled PP composite, while it shows lower melt flow index, elongation%, and flexural modulus. These seemed to be due to the increased surface area of nano-kenaf fiber contacting PP matrix and reduced impurities such as volatile extractives on the fiber surface.
Polyimide Films Using Dianhydride Containing Ester Linkages and Various Amine Monomers
Choi, Chang Hwon ; Chang, Jin-Hae ;
Polymer Korea, volume 37, issue 5, 2013, Pages 618~624
DOI : 10.7317/pk.2013.37.5.618
Hydroquinone bis(trimellitic anhydride) (HQ-TA) was synthesized from trimellitic anhydride chloride and hydroquinone. Poly(amic acid)s (PAAs) were synthesized by reacting a HQ-TA with six different diamines, which were cyclized to yield polyimides (PIs) containing ester linkages by chemical- and thermal-imidization methods. The various PIs were synthesized from structurally different aromatic diamines. The glass transition temperatures (
) were in the range of 167-
, and the decomposition temperatures (
) were in the range of
. The maximum improvements in coefficient of thermal expansion (CTE) and barrier to oxygen permeation were observed in PIs using TFB (3.23
) and 4,4-ODA (<
), respectively. The PI films possessed a transmittance of 65-89% at 500 nm and had a yellowish color with a yellow index (YI) of 3.01-69.52.
Synthesis and Characterization of Catechol-Containing Biomimetic Mucoadhesive Polymers
Park, Dong Jin ; Lee, Sang Jin ; Lee, Sang Cheon ;
Polymer Korea, volume 37, issue 5, 2013, Pages 625~631
DOI : 10.7317/pk.2013.37.5.625
Mucoadhesive property is the major function as an adhesive for medical devices, and therefore, these days many researches have conducted to develop polymers having this property. Recently, biomimetic technology has been used for developing mucoadhesive polymers. Among many technologies, mussel-inspired approaches have received noticeable attention because of its thread's strong adhesive characteristics. In this study, we synthesized mucoadhesive biomimetic polymers employing catechol structures which are abundant in mussel adhesive proteins, and their structures and molecular weights were characterized by using nuclear magnetic resonance spectroscopy and gel permeation chromatography. To evaluate in vitro mucoadhesive strength, the sheet type of the small intestinal porcine submucosa was prepared. Compared to commercial fibrin glue adhesives, catechol-containing mucoadhesive polymers showed enhanced adhesive strength. The study of adhesive strength with considering diverse factors, such as temperature, pressure, and oxidant amount indicated that mussel-inspired mucoadhesive polymer could be a promising candidate for an adhesive in various biomedical applications.
Effects of Demineralized Bone Particle Loaded Poly(lactic-co-glycolic acid) Scaffolds on the Attachment and Proliferation of Costal Cartilage Cells
Cho, Sun Ah ; Song, Jeong Eun ; Kim, Kyoung Hee ; Ko, Hyun Ah ; Lee, Dongwon ; Kwon, Soon Yong ; Chung, Jin Wha ; Khang, Gilson ;
Polymer Korea, volume 37, issue 5, 2013, Pages 632~637
DOI : 10.7317/pk.2013.37.5.632
It has been widely accepted that costal cartilage cells (CCs) have more excellent initial proliferation capacity than articular cartilage cells as well as the easiness for isolation and collection. This study demonstrated that CCs might be one of the substitutes for articular cartilage cells by tissue engineered cartilage. Poly(lactic-co-glycolic acid) (PLGA) has been extensively tested and used as scaffold material but it was limited by the low attachment of cells and the induction of inflammatory cells. Base on previous our studies, we confirmed demineralized bone particle (DBP) had the power of the reduction of inflammatory reaction and the stimulation proliferation of cells. We fabricated PLGA scaffold loaded with 10, 20, 40 and 80 wt% DBP and then tested the possibility of the regeneration of cartilage using CCs. Assays of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and scanning electron microscope (SEM) carried out to evaluate the attachment and proliferation of CCs in DBP/PLGA scaffolds. Glycosaminoglycan (sGAG) and collagen contents assay were conducted to confirm the effects of DBP on formation of extracellular matrix. This study demonstrated that DBP/PLGA scaffolds showed significant positive effects on cell growth and proliferation due to the vitality of DBP as well as the possibility of the application of CCs for tissue engineered cartilage.
Thermoelectric Properties of Graphite Nanosheets/Poly(vinylidene fluoride) Composites
Yoon, Ho Dong ; Nam, Seungwoong ; Tu, Nguyen D.K. ; Kim, Daeheum ; Kim, Heesuk ;
Polymer Korea, volume 37, issue 5, 2013, Pages 638~641
DOI : 10.7317/pk.2013.37.5.638
GNS/PVDF composites were prepared using graphite nanosheets (GNS) and poly(vinylidene fluoride) (PVDF) for flexible thermoelectric application. We measured the electrical conductivity, thermal conductivity and Seebeck coefficient of GNS/PVDF composites with different contents of GNS and then evaluated the thermoelectric properties of GNS/PVDF composites. The electrical conductivity of GNS/PVDF composites increased from 389 to 1512 S/m with increasing the content of GNS from 10 to 70 wt%. While the electrical conductivity dramatically increased, Seebeck coefficient and thermal conductivity did not show any big difference as the content of GNS increases. In this study, we demonstrated that GNS/PVDF composites improved the thermoelectric properties by decreasing the thermal conductivity due to the phonon scattering at the interfaces between polymer and GNS nanoplatelets.
Experimental Study on Friction Characteristics between Sliding Polymer Plates for Reduction of Stick-and-Slip Abnormal Noise
Lee, Dong-Gyu ; Park, Hee-Jin ; Park, Sang-Hu ;
Polymer Korea, volume 37, issue 5, 2013, Pages 642~648
DOI : 10.7317/pk.2013.37.5.642
There is a kind of abnormal noise known to come from the stick-slip mechanism induced by frictional impulses during the sliding of two polymeric plates. In this work, quantitative analysis of abnormal noise is carried out based on experimental results. Some combinations of polymer plates, such as an ABS base-plate contacted to ABS, PP, MIPS, and POM plates, which are well-known materials used in home-appliances, are studied to obtain the best combination of polymer plates in order to reduce the abnormal noise. For the experiments, a rig for the test was set up and a methodology was proposed. In addition, the effects of the surface roughness of the plate, the normal loading force, and the relative sliding speed between the two contact plates were evaluated in order to understand the reason for the abnormal noise. Through this experimental work, the optimal combination of materials was ABS/POM system to reduce the noise in real industrial applications.
Radiolytic Fabrication and Characterization of PTFE-g-PAA as the Supporters for the Reinforced Composite Fuel Cell Membrane
Sohn, Joon-Yong ; Park, Byeong-Hee ; Song, Ju-Myung ; Lee, Young-Moo ; Shin, Junhwa ;
Polymer Korea, volume 37, issue 5, 2013, Pages 649~655
DOI : 10.7317/pk.2013.37.5.649
In order to use as supporters for the reinforced composite fuel cell membrane, poly(acrylic acid)-grafted porous polytetrafluoroethylenes (PTFEs) were prepared via introduction of poly(acrylic acid) graft chains by a radiation grafting method. FTIR was utilized to confirm the successful introduction of poly(acrylic acid) graft polymer chains into the porous PTFEs. Contact angles were examined to observe the hydrophilicity of the surface of the prepared substrates. The result indicates that the hyrophilicity of the surface in the prepared substrates increases with an increase in the number of hydrophilic polymer chains. FE-SEM, gurley number, and tensile strength were also utilized to characterize the prepared substrates.
Manufacturing of Flexible Patterned Cover Film for Solar Cell by Solution Coating
Park, Chanwook ; Kang, Ho-Jong ;
Polymer Korea, volume 37, issue 5, 2013, Pages 656~662
DOI : 10.7317/pk.2013.37.5.656
The flexible patterned cover film was made by a simple solution coating process using polymethyl methacrylate (PMMA) solution with glass beads. The effect of patterned cover film on the efficiency of solar cell has been investigated. It was found that the relative solar cell efficiency increased up to 3.4% with the incident light angle between
by the sphere shape of glass bead coated on the film surface. This was understood that the loss of transmittance and scattering due to the light directional dependency on solar cell were minimized because the light entered glass beads normal to its surface regardless of incident light angle. The maximum relative solar cell efficiency was achieved when glass bead shape on the film is hemisphere and the relative efficiency increased with increasing the amount of glass bead on the film surface. However, too much glass beads on the film surface resulted in the lower relative solar cell efficiency due to the lowering of transmittance as well as the occurring of light interference.
Effects of Polymers on the Cocrystallization of Adefovir Dipivoxil and Suberic Acid
Jung, Sungyup ; Kim, Il Won ;
Polymer Korea, volume 37, issue 5, 2013, Pages 663~668
DOI : 10.7317/pk.2013.37.5.663
The effects of polymers on the cocrystallization of adefovir dipivoxil (AD) and suberic acid (SUB) were investigated. The polymeric additives in the present study were poly(ethylene glycol) (PEG) and poly(acrylic acid) (PAA). When the polymers were added to the solution of AD and SUB, their effects were limited to the morphology and crystallinity of the AD/SUB cocrystal, which could be also achieved without polymeric additives by the excess amount of SUB in the solution or through the solvent-assisted grinding. When the polymers were mixed with AD before adding SUB in the solution, PEG was dramatically more effective at the same amount with possible alteration of the cocrystal structure. Also, PAA completely inhibited the formation of crystals. The present study demonstrated that the effects of polymers on the cocrystallization could be tuned by simply modifying the mixing strategy.