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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 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
Fabrication of High-Aspect-Ratio Microscale Polymer Hairs Having Surface Wrinkles
Park, Sang-Hu ; Kim, Seong-Jin ; Park, Hee-Jin ; Lee, Joo-Chul ; Shin, Bo-Sung ;
Polymer Korea, volume 37, issue 1, 2013, Pages 1~4
DOI : 10.7317/pk.2013.37.1.1
We proposed a new process to fabricate a high-aspect-ratio microhair having surface wrinkles using the contact-and-tension of a microstamp. Through this work, we observed that regular surface wrinkles were generated on the hair with a diameter of around
due to the uni-directional compressive stress during the photocuring process by ultraviolet light. To do this, we conducted an experimental system setup for contact-and-tension process. From the preliminary test results, we believed that the proposed method can be applied to make a long polymer hair having surface wrinkles for special applications to biomimetics, and some research fields related on surface area such as heat transfer and catalyst enhancement.
Analysis of Degradation Behaviors of Geomembrane by Accelerated Test under UV Exposure Conditions
Park, Yeong Mog ; Khan, Belas Ahmed ; Jeon, Han Yong ;
Polymer Korea, volume 37, issue 1, 2013, Pages 5~14
DOI : 10.7317/pk.2013.37.1.5
In this paper the effect of UV (ultraviolet) exposure on HDPE (high density polyethylene)-smooth and f-PP (flexible polypropylene) geomembranes is evaluated under UVB-313 (ultraviolet wavelength 290-315 nm) exposure. Tensile property, melt flow index (MFI), oxidation induction time (OIT), both standard-OIT and high pressure-OIT and Fourier transform infrared spectroscopy/attenuated total reflectance (FTIR/ATR) results are discussed. Although tensile properties of the exposed geomembrane samples remained unchanged, the depletion of antioxidants was found higher for f-PP than for HDPE geomembrane. Arrhenius model by extrapolation was used on the data to predict the antioxidant lifetime to a typical site temperature of
. There was no significant difference between the MFI value of the virgin and UV exposed HDPE geomembrane samples but a decrease in MFI was found in f-PP geomembrane that signifies that crosslinking has occurred. From FTIR spectra, the small peak (near
) observed in the spectrum of UV exposed sample corresponds to a carbonyl (C=O) linkage, which suggests that oxidation has occurred in the polymer structure, and another new band for f-PP between 3100 and
is attributed to a hydroxyl bond and/or hydroperoxide bond.
Nanoencapsulations of Paraffin Wax by Miniemulsion Polymerization and Their Thermal Properties as Phase Change Materials
Shin, Dae Cheol ; Lee, Kyungwoo ; Kim, Jeong Soo ;
Polymer Korea, volume 37, issue 1, 2013, Pages 15~21
DOI : 10.7317/pk.2013.37.1.15
Encapsulation of a paraffin wax core as a phase change material with polystyrene shell and the its thermal characteristics caused by the encapsulation were studied. For the nanoencapsulation, the miniemulsion polymerization method was selected. The factors affecting the thermal properties of prepared nanocapsule particles of phase change material were analysed in aspect of the structure of crosslinking agents, amounts of surfactant, ratio of paraffin wax to monomer, and hydrophilicity of initiators. It was assumed that Oswald ripening plays the most important role in the changes of particle size, particle morphology, and thermal capacity of nanocapsule core. It was elucidated that the thermal capacity was also dependent on the hydrophilicity and crosslinking density of polystyrene shell components.
A Study on the Improvement of the Thermal Stability of PE Separator for Lithium Secondary Battery Application Using Poly(meta-phenylene isophthalamide)
Park, Mina ; Ra, Byung Ho ; Bae, Jin-Young ; Kim, Byung-Hyun ; Choi, Won-Kun ;
Polymer Korea, volume 37, issue 1, 2013, Pages 22~27
DOI : 10.7317/pk.2013.37.1.22
In this study, we prepared separators with improved thermal stability by coating microporous polyethylene (PE) film for lithium secondary battery using poly(meta-phenylene isophthalamide) (Nomex). The mechanical and thermal properties of prepared separators were evaluated by thermal stability test and TMA as a function of the Nomex concentration and coating parameters. The corresponding coated PE separator showed better thermal and mechanical properties than the original PE separator. Electrochemical properties were also assessed by ionic conductivity, cyclic voltammetry and charge/discharge cycle.
Effect of Ratio of Polyoxalate/PLGA Microspheres on the Release Behavior of Zaltoprofen
Lee, Jung Keun ; Kim, Kyoung Hee ; Kim, Young Lae ; Park, Guk Bin ; Kim, Min Jeong ; Kang, Su Ji ; Lee, Dongwon ; Khang, Gilson ;
Polymer Korea, volume 37, issue 1, 2013, Pages 28~33
DOI : 10.7317/pk.2013.37.1.28
Zaltoprofen, a propionic acid derivative non-steroidal anti-inflammatory drug, was known to have powerful inhibitory effects on acute, subacute and chronic inflammation. For initial release and sustained release, the microspheres were prepared using an emulsion-solvent evaporation method like an O/W emulsion method with varying the ratio of zaltoprofen-loaded polyoxalate (POX)/PLGA micropheres. The morphology of the microspheres was confirmed by scanning electron microscopy. The crystallinity of microspheres was analyzed by X-ray diffraction and differential scanning calorimeter. Fourier transform infrared spectroscopy was used to analyze the chemical structure of microspheres. The increased ratio of POX microspheres affected the initial drug release, and the sustained release of drug was influenced by ratio of PLGA microspheres. In this study, the initial release behavior of zaltoprofen can be controlled by the ratio of POX/PLGA microspheres.
Preparation and Property of POSS-Based Organic-Inorganic Hybrid Filler and Polyamide Thermoplastic Elastomer (PA-TPE)/POSS Nanocomposite
Han, Jae Hee ; Kim, Hyung Joong ;
Polymer Korea, volume 37, issue 1, 2013, Pages 34~40
DOI : 10.7317/pk.2013.37.1.34
Commercially available polyamide thermoplastic elastomer (PA-TPE) was blended with hybrid filler which was prepared by means of the reaction between polyhedral oligomeric silsesquioxane (POSS) containing amine group and toluene diisocyanate (TDI)-caprolactam (CL) to explore the effect of blending the hybrid filler with the TPE. The chemical structure of the filler was identified by using FTIR and
NMR. The composites, PA-TPE/POSS-(TDI+CL), which were the blends of TDI+CL modified POSS filler and PA-TPE up to 7 wt%, showed better elastic recovery delivered from lower tension setting compared to the PA-TPE and the PA-TPE/octaphenyl POSS blend. In addition the tensile strength and the initial modulus increased with increasing the hybrid filled content. Consequently it was assumed that the POSS-(TDI+CL) filler was a suitable material for enhancing strength and modulus without loss of elastic properties for the original PA-TPE.
Effect of Polyhedral Oligomeric Silsesquioxane on Cure Characterization of an Epoxy/Amine System
Gu, Puzhong ; Lee, Jong Keun ;
Polymer Korea, volume 37, issue 1, 2013, Pages 41~46
DOI : 10.7317/pk.2013.37.1.41
The glass transition temperature (
) and conversion (
) were measured for a diglycidyl ether of bisphenol A (DGEBA) epoxy/aromatic amine system incorporated with an organic-inorganic hybrid molecule, polyhedral oligomeric silsesquioxane (POSS). Samples isothermally cured at varying cure temperatures and times were analyzed by differential scanning calorimetry (DSC).
vs. ln (time) data at an arbitrary reference were superposed by time-temperature shifts for the kinetically controlled reaction, and the shift factors were used to calculate an Arrhenius activation energy. Influence of POSS was investigated from
data, which in turn were fitted with DiBenedetto equation.
A Study on Thermal Conductivity and Fracture Toughness of Alumina Nanofibers and Powders-filled Epoxy Matrix Composites
Choi, Jeong-Ran ; Park, Soo-Jin ;
Polymer Korea, volume 37, issue 1, 2013, Pages 47~51
DOI : 10.7317/pk.2013.37.1.47
In this work, the effect of alumina nanofibers on thermal conductivity and fracture toughness of alumina nanofibers and powder filled epoxy (EP) composites were investigated with varying alumina nanofiber content from 20 to 100 phr. Thermal conductivity was tested using a laser flash analysis (LFA). The fracture toughness of the composites were studied through the critical stress intensity factor (
) measurement. The mophologies were observed by scanning electron microscopy (SEM). From the results, it was found that the thermal conductivity was enhanced with increasing alumina nanofiber content, which played a key factor to determine the thermal conductivity. The
value was increased with increasing alumina nanofiber content, whereas the value decreased above 40 phr alumina nanofiber content. This was probably considered that the alumina nanofiber entangled each other in EP due to an excess of alumina nanofibers.
Preparation of Surface-Hydrolyzed Cellulose Acetate Fibers and Their Applications to LCD Rubbing Cloth
Kim, Hyun-Sun ; Kim, Young Ho ;
Polymer Korea, volume 37, issue 1, 2013, Pages 52~60
DOI : 10.7317/pk.2013.37.1.52
Partially hydrolyzed cellulose acetate (CA) fibers were prepared by treating CA fibers in aqueous
solutions of various concentrations. The deacetylation of CA fibers was confirmed through FTIR spectra and WAXD patterns. The hydrolysis was confined to the surface part of the CA fiber by controlling the treatment conditions. The resultant fibers had a sheath-core structure with a sheath component of regenerated cellulose and a core of non-hydrolyzed cellulose acetate. The SEM images of the surface-hydrolyzed CA fibers, the core of which was dissolved out using acetone as the solvent, showed that the sheath thickness increased with increasing alkaline concentration, indicating an increase in the hydrolyzed fiber, i.e., regenerated cellulose. Polarized FTIR analysis of the polyimide film rubbed with velvet fabrics of surface-hydrolyzed CA fibers showed that polyimide molecules were preferentially oriented to the rubbing direction.
Effect of Anodic Oxidation of H
Ratio for Improving Interfacial Adhesion between Carbon Fibers and Epoxy Matrix Resins
Moon, Cheol-Whan ; Jung, Gun ; Im, Seung-Soon ; Nah, Changwoon ; Park, Soo-Jin ;
Polymer Korea, volume 37, issue 1, 2013, Pages 61~65
DOI : 10.7317/pk.2013.37.1.61
In this work, the anodic oxidation of carbon fibers was carried out to enhance the mechanical interfacial properties of carbon fibers-reinforced epoxy matrix composites. The surface characteristics of the carbon fibers were studied by FTIR, X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM). Also, the mechanical interfacial properties of the composites were studied with interlaminar shear strength (ILSS), critical stress intensity factor (
), and critical strain energy release rate (
). The anodic oxidation led to a significant change in the surface characteristics of the carbon fibers. The anodic oxidation of carbon fiber improved the mechanical interfacial properties, such as ILSS,
of the composites. The mechanical interfacial properties of the composites anodized at 20% sulfuric/nitric (3/1) were the highest values among the anodized carbon fibers. These results were attributed to the increase of the degree of adhesion at interfaces between the carbon fibers and the matrix resins in the composite systems.
Studies on Durability and Polarization Properties of Poly(vinyl alcohol) Polarizing Films Prepared with Reactive Dichroic Dyes
Choi, E-Joon ; Choi, Seung Sock ; Park, Il Hyun ; Chang, Jin Ho ; Back, Sang-Hyun ; Park, Sang-Bong ;
Polymer Korea, volume 37, issue 1, 2013, Pages 66~73
DOI : 10.7317/pk.2013.37.1.66
Three reactive dichroic dyes with 3,5-dichloro-2,4,6-triazine moiety were synthesized by reaction between dichroic dyes (such as congo red, direct black 22 or direct black 4) and cyanuric chloride. Poly(vinyl alcohol) (PVA) films were dyed with the obtained three reactive dichroic dyes. After 400% drawing of the PVA films, their optical properties were compared with an iodine-doped PVA film prepared in the same condition. Durability test was performed at
in 85% of relative humidity for 120 hrs. We found that compared with the iodine-doped PVA polarizing film, the relative durability of the PVA polarizing film dyed with the reactive dichroic dyes was greatly improved.
Synthesis of Poly(vinylidene fluoride-co-hexafluoropropylene)
Lee, Sang Goo ; Ha, Jong-Wook ; Park, In Jun ; Lee, Soo-Bok ; Lee, Jong Dae ;
Polymer Korea, volume 37, issue 1, 2013, Pages 74~79
DOI : 10.7317/pk.2013.37.1.74
Polyvinylidene fluoride (PVDF) and its copolymer with hexafluoropropylene (HFP) were successfully prepared from free radical solution polymerizations using diisopropyl peroxidicarbonate (DIPPDC) in the presence of 1,1,2-trichlorotrifluoroethane (R-113). The reactivity ratios of VDF and HFP were estimated as
. This result indicates that HFP cannot undergo self propagation. The weight-average molecular weight and molecular weight distribution of copolymers were found to decrease with increasing HFP content. The melting temperature of copolymers linearly decreased with the increase of HFP content because of the introduction of HFP. Moreover, no melting peak was observed for the copolymers with high HFP content. The glass transition temperature of copolymers gradually increased with the increase of HFP content due to the restricted flexibility of the polymer chains.
Anionic Polymerization of Hexafluoropropylene Oxide Using Hexafluoropropylene Oligomer
Lee, Sang Goo ; Ha, Jong-Wook ; Park, In Jun ; Lee, Soo-Bok ; Lee, Jong Dae ;
Polymer Korea, volume 37, issue 1, 2013, Pages 80~85
DOI : 10.7317/pk.2013.37.1.80
Anionic polymerization of hexafluoropropylene oxide (HFPO) was investigated under various reaction conditions such as various hexafluoropropylene (HFP) oligomers composed of dimer and trimer, reaction temperatures, and feeding rates of hexafluoropropylene oxide monomer. HFP oligomer was synthesized from cesium fluoride (CsF) and HFP in tetraethyleneglycol dimethylether (TG). Under 5 g of CsF, 200 g of HFP, 10 g of TG, and reaction temperature
, HFP dimer content in oligomer was relatively increased. HFPO oligomer with a high molecular weight (
3600) was synthesized in conditions of reaction temperature
, HFP oligomer with 35.1% of dimer, and 1.85 g/min of HFPO feeding rate. Otherwise, chain transfer was increased under unoptimized reaction conditions. Consequently, it was found that reaction conditions impact chain propagation and chain transfer in the anionic polymerization of HFPO.
Influence of Fluorinated Illite on Thermal, Antibiotic and Far-infrared Emission Properties of Polypropylene Non-woven Fibers
Kim, Jinhoon ; Im, Ji Sun ; Seo, Kyeong-Won ; Lee, Young-Seak ;
Polymer Korea, volume 37, issue 1, 2013, Pages 86~93
DOI : 10.7317/pk.2013.37.1.86
In this work, the thermal, antibiotic properties and far-infrared emissivity of fluorinated illite embedded polypropylene non-woven fibers (f-illite/PP fibers) were investigated in the presence of 0, 1, 3, 5 and 7 wt% illite powders. The thermal properties of f-illite/PP fibers were studied by thermogravimetric analysis (TGA). Their antibiotic properties were examined by Staphylococcus aureus and Klebsiella pneumoniae test. Their far-infrared emissivity was also investigated by Fourier transform infrared spectroscopy. From the experimental results, thermal, antibiotic properties and far-infrared emissivity of f-illite/PP fibers were improved by increasing fluorinated illite contents and the property values of 5 wt% f-illite/PP fibers were increased remarkably by about 10.3, 41.2 and 9.8% respectively in comparison with PP non-woven fibers having no fluorinated illite additive. This result was interpreted as the development of interfacial adhesion force between the polymer chains due to the fluorination of illite power.
Synthesis of Polymerizable Amphiphiles with Basic Oligopeptides for Gene Delivery Application
Bae, Seon Joo ; Choi, Hye ; Choi, Joon Sig ;
Polymer Korea, volume 37, issue 1, 2013, Pages 94~99
DOI : 10.7317/pk.2013.37.1.94
Polydiacetylene (PDA) is made by photopolymerization of self-assembled diacetylene monomers. If diacetylene monomers are arranged systematically and close enough with distance of atoms, 1,4-addition polymerization will occur by the irradiation of 254 nm ultraviolet rays and then PDA will have alternated ene-yne polymer chains at the main structure. Aqueous solutions of diffused PDA is tinged with blue which shows
640 nm. Visible color changes from blue to red occurs in response to a variety of environmental perturbations, such as temperature, pH, and ligand-receptor interactions. In this study, we synthesized cationic peptides - PCDA(10,12-pentacosadyinoic acid) liposome using a solid phase peptide synthesis (SPPS) method and prepared liposome solutions at various molar ratios using MPEG-PCDA. When mammalian cells were treated with the liposomes, high transfection efficiency and low toxicity were observed.
Nylon 66 Viscosity Effect on Mechanical Properties of Nylon 66/Cloisite 93A Nanocomposite
Park, Sang-Cheol ; Kim, Ho-Gyum ; Min, Kyung-Eun ;
Polymer Korea, volume 37, issue 1, 2013, Pages 100~112
DOI : 10.7317/pk.2013.37.1.100
It is found that the commercialization of nylon 66/Cloisite 93A nanocomposite by applying melt intercalation is possible in the composite production facilities of the pilot scale which has been generalized today. The strength and modulus under tensile and flexural stress have been improved with the introduction of Cloisite 93A in nylon 66. Furthermore, it is found through the analysis of morphologic and crystallization behavior that the elements such as content of Cloisite 93A, viscosity of nylon 66 and the crystallization behavior have significantly influences on the characteristics of nanocomposite.
Effect of MMT on Anti-Water Absorption of Polyamide/MMT Nanocomposites
Park, Sang-Cheol ; Kim, Ho-Gyum ; Min, Kyung-Eun ;
Polymer Korea, volume 37, issue 1, 2013, Pages 113~120
DOI : 10.7317/pk.2013.37.1.113
The melt intercalation to commercialize nanocomposites in a pilot scale was applied and the water absorption characteristics for polyamide/MMT nanocomposites manufactured by twin screw extruder was studied. As a result, water absorption decreased with the introduction of MMT and dimensional stability was improved. However, as water absorption increased, flexural strength and modulus were reduced. Therefore, the effect of MMT introduction on mechanical properties of nanocomposites was clearly observed, which may increase the level of strength by maintaining anti-water absorption property of nanocomposite.
Synthesis of UV Curable 4,4'-Thiodibenzenethiol-based Epoxy Acrylate and Their Refractive Index Behavior
Baek, Seung-Suk ; Lee, Sang Won ; Hwang, Seok-Ho ;
Polymer Korea, volume 37, issue 1, 2013, Pages 121~126
DOI : 10.7317/pk.2013.37.1.121
UV-curable high refractive index di-functional epoxy acrylate, 4,4'-thiodibenzenethiol diglycidyl ether diacrylate, was synthesized from acrylic acid and 4,4'-thiodibenzenethiol diglycidyl ether that was obtained by reacting 4,4'-thiodibenzenethiol and epichlorohydrin using a direct method (Taffy process). Its chemical structure was identified by
NMR and FTIR. After its dilution with a reactive diluent, 2-phenoxythiol ethyl acrylate as 5, 10, 15, 20, and 30 wt% content, the relationship between their viscosity and refractive index was investigated. Their degree of cure decreased with increasing the amount of reactive diluent, and the refractive index of UV-cured film increased with increasing the degree of cure.