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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
The Polymer Society of Korea
Editor in Chief :
Volume & Issues
Volume 36, Issue 6 - Nov 2012
Volume 36, Issue 5 - Sep 2012
Volume 36, Issue 4 - Jul 2012
Volume 36, Issue 3 - May 2012
Volume 36, Issue 2 - Mar 2012
Volume 36, Issue 1 - Jan 2012
Selecting the target year
A Study on Flammability and Mechanical Properties of HDPE/EPDM/Boron Carbide/Triphenyl Phosphate Blends with Compatibilizer
Shin, Bum-Sik ; Jung, Seung-Tae ; Jeun, Joon-Pyo ; Kim, Hyun-Bin ; Oh, Seung-Hwan ; Kang, Phil-Hyun ;
Polymer Korea, volume 36, issue 5, 2012, Pages 549~554
DOI : 10.7317/pk.2012.36.5.549
It was known that triphenyl phosphate wasn't homogeneously dispersed in HDPE/EPDM/boron carbide blends, which caused the decrease in mechanical properties. HDPE, EPDM, boron carbide, and triphenyl phosphate were blended with PE-g-MAH(polyethylene-graft-maleic anhydride) as a compatiblizer for improving the miscibility of triphenyl phosphate. Tensile strength of HDPE/EPDM/boron carbide blends decreased with increasing the contents of triphenyl phosphate for flammability. However, the mechanical properties of HDPE/EPDM/boron carbide/triphenyl phosphate blends increased by the addition of compatiblizer because triphenyl phosphate was homogeneously mixed in the blend system. The homogeneous dispersibility of triphenyl phosphate was confirmed by using scanning electron microscopy (SEM). Increased thermal stability and flammability derived from high miscibility of triphenyl phosphate were confirmed by the results of thermogravimetric analysis (TGA) and limiting oxygen index (LOI). A self-extinguishing HDPE/EPDM/boron carbide/triphenyl phosphate blend was successfully fabricated with more than 21% LOI.
A Study on the Warpage of Glass Fiber Reinforced Plastics for Part Design and Operation Condition: Part 1. Amorphous Plastics
Lee, Min ; Kim, Hyeok ; Lyu, Min-Young ;
Polymer Korea, volume 36, issue 5, 2012, Pages 555~563
DOI : 10.7317/pk.2012.36.5.555
Warpage of injection molded product is caused by non-uniform shrinkage during shaping operation and relaxation of residual stress. Robust part design and glass fiber reinforced reins have been adopted to prevent warpage of part. Warpages for part designs have been investigated in this study according to the injection molding conditions. Part design contains flat specimen and two different rib designs in the flat part. Resins used in this study were glass fiber reinforced amorphous plastics, PC and ABS. Different rib designs showed significant differences of warpages in the parts. Various warpages have been observed in the three regions of the part, near gate region, opposite region to the gate, and flow direction region. Results of computer simulation revealed that the warpages were strongly related to glass fiber orientation. Flat specimen showed the smallest warpage and the specimen with ribs to the flow direction showed a high resistance to warpage. Warpage highly depended upon part design rather than molding condition. It was concluded that the rib design and selection of gate location in injection molding would be the most important factors for the control of warpage since those are directly related to the fiber orientation during molding.
Synthesis and Properties of Nonfluoro Aminated Poly(vinylbenzyl chloride-co-ethyl methacrylate-co-styrene) Anion Exchange Membranes for MCDI Process
Koo, Jin-Sun ; Kwak, Noh-Seok ; Hwang, Taek-Sung ;
Polymer Korea, volume 36, issue 5, 2012, Pages 564~572
DOI : 10.7317/pk.2012.36.5.564
A terpolymer of vinylbenzyl chloride-co-ethyl methacrylate-co-styrene (VBC-EMA-St) was prepared for membrane capacitive deionization (MCDI) by radical polymerization and amination reaction of various amination times. Nonfluoro aminated VBC-EMA-St anion-exchange membranes were characterized by Fourier transform infrared (FTIR) spectrometry. Molecular weight, polydispersity and thermal stability were obtained by gel permeation chromatography (GPC) and thermogravimetric analysis (TGA). The basic properties such as water uptake, ion exchange capacity, electrical resistance and CDI charge-discharge current were measured. The optimal values of ion exchange capacity, water uptake, electrical resistance and molecular weight of synthesized anion-exchange membrane were 1.69 meq/g, 23.7%, 1.61
g/mol, respectively. As compared with conventional membrane, the pattern of cyclic charge-discharge current of synthesized anion-exchange membrane indicated efficient electrosorption and desorption.
Mechanical Properties of Aminosilane-Treated Wood Flour/PVC/Nanoclay Composites
Park, Sol-Mon ; Kim, Dae-Su ;
Polymer Korea, volume 36, issue 5, 2012, Pages 573~578
DOI : 10.7317/pk.2012.36.5.573
In general, most physical properties of wood/polyvinyl chloride (PVC) composites are lower than those of corresponding neat PVC resin because of poor interfacial adhesion between the hydrophilic wood flour and hydrophobic PVC. Therefore, in this study, we treated wood flour with three aminosilanes to improve wood/PVC interfacial adhesion strength, and eco-friendly wood/PVC/nanoclay composites were prepared by melt blending the aminosilane-treated wood flour, a heavy metal free PVC compound, and a type of nanoclay. The effects of treating wood flour with the aminosilanes and adding the nanoclay on the mechanical properties of the composites were investigated. Mechanical properties of the composites were investigated by universal testing machine (UTM), izod impact tester, dynamic mechanical analyzer (DMA), and thermomechanical analyzer (TMA). The tensile properties of the composites with the aminosilane-treated wood flour were considerably higher than those of the composites with neat wood flour. Furthermore, a small amount of the nanoclay improved mechanical properties of the composites. The performance of the wood/PVC composites was considerably improved by using the aminosilane-treated wood flour and the nanoclay.
Morphology and Electrical Conductivity of Polystyrene/Carbon Nanotube Microcellular Foams Polymerized by High Internal Phase Emulsions
Noh, Won-Jin ; Kang, Myung-Hwan ; Lee, Seong-Jae ;
Polymer Korea, volume 36, issue 5, 2012, Pages 579~585
DOI : 10.7317/pk.2012.36.5.579
Polystyrene/carbon nanotube (CNT) microcellular foams were prepared to have electrically conductive properties via high internal phase emulsion polymerization. In this study, we have investigated the effects of surface modification of CNT, surfactant content and dispersion time to improve the stability of emulsion and the electrical conductivity of foam. Acid treatment and a surfactant were used to effectively disperse CNTs in the aqueous phase. In the organic phase, CNTs were used after a surface modification with organic functional groups. The degree of dispersion of CNTs was estimated by the electrical conductivity of resultant microcellular foams. With raw CNTs dispersed with the surfactant in the aqueous phase, substantial conductivity increase was observed but the foams were slightly shrunk. The foams prepared with organically modified CNTs dispersed in the organic phase showed stable cell morphology without shrinkage, but displayed limitation to improve the conductivity.
Synthesis of Homing Peptide-Immobilized Magnetite Nanoparticles through PEG Spacer and Their Biomedical Applications
Lee, Sang-Min ; Xing, Zhi-Cai ; Shin, Yong-Suk ; Gu, Tae-Hyung ; Lee, Byung-Heon ; Huh, Man-Woo ; Kang, Inn-Kyu ;
Polymer Korea, volume 36, issue 5, 2012, Pages 586~592
DOI : 10.7317/pk.2012.36.5.586
Iron oxides (
) are metabolically secreted after endocytosed by cells, indicating no cytotoxicity. Therefore, they are widely used as a contrast agent before photographing of magnetic resonance imaging. In this study, iron oxide nanoparticles are synthesized by the co-precipitation method and subsequently immobilized with a homing peptide (AP), which specifically interacts with interleukin-4 receptor located on the membrane of endothelial and bladder cancer cells. The size of AP-immobilized iron oxide particle is about 39 nm. Intracellular uptake of the AP-immobilized iron oxide nanoparticles was investigated using bladder cancer cells and fibroblasts as the control. As the result, the nanoparticles are specificially uptaken by bladder cancer cells. However, the nanoparticles are not specificially uptaken by fibroblast. It could be said that the AP-immobilized iron oxide nanoparticles have a potential to be used as a contrast agent for early diagnosis of cancer.
Study on Solution Polymerization Behaviors by Mixed Aluminium Compound Catalysts
Yoo, Ji-Yun ; Kim, Da-Hee ; Ko, Young-Soo ;
Polymer Korea, volume 36, issue 5, 2012, Pages 593~598
DOI : 10.7317/pk.2012.36.5.593
Solution polymerization behaviors of L-lactide using single and mixed aluminium catalyst systems were studied. Triisobutylaluminium (TIBA) was a reference catalyst for mixing. For the
/TIBA catalytic systems, the molecular weight of the resulting polylactide (PLA) decreased as the composition of
increased. The higher molecular weight shoulder was revealed in their GPC curve. At TIBA of 80 mol% a bimodal GPC curve was shown. The conversion in the trimethylaluminium (TMA)/TIBA catalysts system decreased as the composition of TMA in the mixed catalyst increased. The conversion in the trioctylaluminium (TOA)/TIBA catalysts system decreased as the composition of TOA in the mixed catalyst increased. The unimodal molecular weight distribution was observed with the TOA/TIBA catalyst systems. The Al compounds-mixed catalyst could produce a higher molecular weight shoulder in the GPC curve.
Study on the Improvement of Physicochemical Properties of PEDOT-Metal Oxide Composite Thin Film by Vapor Phase Polymerization
Nam, Mi-Rae ; Yim, Jin-Heong ;
Polymer Korea, volume 36, issue 5, 2012, Pages 599~605
DOI : 10.7317/pk.2012.36.5.599
The physicochemical properties such as surface hardness, solvent mechanical wear resistance, and resistance to scratch properties of poly(3,4-ethylenedioxythiophene) (PEDOT) thin film prepared by vapor phase polymerization (VPP) was effectively improved by post-treatment of various metal alkoxide sol solutions. Metal oxide layer derived from sol-gel process of metal alkoxide was generated on the PEDOT thin film layer by VPP, resulting in improving mechanical properties of the conductive thin films without any deterioration of their original surface resistance. Several kinds of silicone and titanium alkoxide derivatives with various functional groups were used as metal alkoxide sol sources. Among them, PEDOT-metal oxide composite thin film derived tetraethyl orthosilicate showed the best performance in the terms of surface resistance, transmittance, and various physicochemical properties. The effect of metal alkoxide content in washing solution, oxidant content and drying temperature have been investigated in order to optimize the various properties of PEDOT-metal oxide composite thin film.
Effect of Post-Process on Physical Properties of Electrospun PEI/PVdF Blend Nonwoven Web
Seok, Hoon ; Park, Cheol-Min ; Kim, Dong-Young ; Jo, Seong-Mu ;
Polymer Korea, volume 36, issue 5, 2012, Pages 606~611
DOI : 10.7317/pk.2012.36.5.606
Polyetherimide (PEI) and poly(vinylidene fluoride) (PVdF) blend web was prepared by electrospinning technique. In order to improve low mechanical properties, post processes like hot-pressing and heat-stretching were employed, and a study on the effects of post processes on their mechanical properties was performed. To confirm the physical properties of the web, scanning electron microscopy and tensile measuring instrument were used. The mechanical strength of webs pressed in the ratios of 1/2, 1/3, 1/4 and 1/5 at
were improved four-to-five times compared to pristine webs. Also they showed an additional increase by 2~8MPa, by heat-stretching 30 to 40% at
Influence of Acid and Base Surface Treatment of Multi-Walled Carbon Nanotubes on Mechanical Interfacial Properties of Carbon Fibers-Reinforced Composites
Jung, Gun ; Nah, Chang-Woon ; Seo, Min-Kang ; Byun, Joon-Hyung ; Lee, Kyu-Hwan ; Park, Soo-Jin ;
Polymer Korea, volume 36, issue 5, 2012, Pages 612~616
DOI : 10.7317/pk.2012.36.5.612
In this work, the effect of chemical treatments of multi-walled carbon nanotubes (MWNTs) on the mechanical interfacial properties of carbon fiber fabric-reinforced composites was investigated. The surface properties of the MWNTs were determined by acid and base values, Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS) analyses. The mechanical interfacial properties of the composites were assessed by interlaminar shear stress (ILSS) and critical stress intensity factor (
). The chemical treatments based on acid and base reactions led to a significant change of surface characteristics of the MWNTs, especially A-MWNTs/carbon fibers/epoxy composites had higher mechanical properties than those of B-MWNTs and non-treated MWNTs/carbon fibers/epoxy composites. These results were probably due to the improvement of interfacial bonding strength, resulting from the acid-base interaction and hydrogen bonding between the epoxy resins and the MWNT fillers.
Miscible Blend and Semi-IPN Gel of Poly(hydroxyethyl aspartamide) with Poly(N-vinyl pyrrolidone)
Meng, Fan ; Jeon, Young-Sil ; Chung, Dong-June ; Kim, Ji-Heung ;
Polymer Korea, volume 36, issue 5, 2012, Pages 617~621
DOI : 10.7317/pk.2012.36.5.617
-poly(2-hydroxyethyl-DL-aspartamides)], a class of poly(amino acid), have been widely studied as biodegradable and biocompatible polymers for potential biomedical and pharmaceutical applications. In this study, we investigated a homogeneous blend of PHEA with poly(N-vinyl pyrrolidone) (PNVP) and its semi-IPN (semi-interpenetrating polymer network) gels. Blend films were prepared by a solution casting method. The resulting blends were totally transparent over the whole composition ranges and the single
, changing monotonously with composition, was observed by DSC to confirm the miscibility between these two polymers. FTIR was used to discuss the possible hydrogen-bonding interaction between polymers. In addition, semi-IPN type gels were prepared by chemical crosslinking of PHEA/PNVP blend solution using hexamethylene diisocyanate (HMDI) as a crosslinking reagent. The prepared gel was characterized by their swelling property and morphology.
Characteristics of Environment-friendly Waterborne Coating Agent Applied to Inorganic Adsorbent
Shin, Jong-Sub ; Lee, Jung-Hee ; Kwak, Eun-Mi ; Yun, Jong-Kuk ; Kim, Hyun-Bum ;
Polymer Korea, volume 36, issue 5, 2012, Pages 622~627
DOI : 10.7317/pk.2012.36.5.622
This study focuses on mechanical property enhancement and volatile organic compounds (VOCs) reduction characteristic of environmentally-friendly waterborne coatings. We synthesized a series of organic-inorganic hybrid waterborne polyurethanes by using poly(tetramethylene glycol) 2000, polycarbonate diol 2000, isophorone diisocyanate, dimethylolpropionic acid and titanium dioxide. The study on the effects of the R ratio([NCO]/[OH]) and inorganic contents on environmentally-friendly waterborne coatings showed that the R ratio with more than 1.5 is appropriate due to arrangement of hardsegments. The applied
on films reduced volatile organic compounds (VOCs).
Measurement of Polymer Chain Depletion Layer in the Poly(vinyl alcohol)/Dimethyl Sulfoxide/Polystyrene Latex System by Dynamic Light Scattering
Eom, Hyo-Sang ; Park, Il-Hyun ;
Polymer Korea, volume 36, issue 5, 2012, Pages 628~636
DOI : 10.7317/pk.2012.36.5.628
The polymer concentration dependence of depletion layer was investigated by means of dynamic light scattering after the very small amount of polystyrene spherical latex particles was added into the matrix solution of poly(vinyl alcohol)(PVA)/dimethyl sulfoxide. At the dilute regime, the magnitude of depletion layer kept constant at the level of
of the radius of gyration of the corresponding PVA chain. Next, at the early semi-dilute regime of
, polymer concentration dependence of the layer thickness
was obtained as
, and this experimental value was very close to theoretical one of -0.75. However it was observed above
>3 that its thickness decreased abruptly, and this was ascribed to aggregation effect of latex particles which was driven by Oosawa type attractive interaction.
Effects of Intermeshing Rotor for Dispersion of Silica Agglomerates in SBR/BR Compound
Kim, Sung-Min ; Kim, Kwang-Jea ;
Polymer Korea, volume 36, issue 5, 2012, Pages 637~642
DOI : 10.7317/pk.2012.36.5.637
The effects of mixing geometry (intermeshing vs. tangential rotor) for the dispersion and distribution of silica agglomerates in SBR/BR compound were investigated. Silica dispersion and distribution were found to be better with the intermeshing rotor compared to the tangential rotor. It was concluded that the intermeshing rotor compared to the tangential rotor delivered a higher shear stress due to interlocked rotor geometry to silica agglomerates leading to better dispersity and distribution of silica in the agglomerates.
Synthesis and Thermal Degradation of Poly(oxydiethylene adipate urethane) Composites Containing Cloisite 30B and Melamine Phosphate
Shin, Seung-Wook ; Lee, Sang-Ho ;
Polymer Korea, volume 36, issue 5, 2012, Pages 643~650
DOI : 10.7317/pk.2012.36.5.643
In order to improve the thermal stability of polyurethane, we synthesized poly(adipate urethane) (PAU) and three PAU composites, PAU/30B (2.7 wt% 30B), PAU/MP (2.2 wt% MP), PAU/30B/MP (2.2 wt% 30B and 2.2 wt% MP), from poly(oxydiethylene adipate)-diol (PAD), 4,4'-methylene diphenyl diisocyanate (MDI), Cloisite 30B (30B), and melamine phosphate (MP). 30B and MP were introduced into the reactant mixture at the initial stage of the esterification between adipic acid and diethylene glycol, so 30B and MP were evenly dispersed in the PAU composites for long period. At temperatures lower than
, the PAU composites were degraded faster than pristine PAU, mainly due to the decomposition of 30B and MP. At higher temperatures, the 30B and MP enhanced the thermal stability of the PAU composites. Compared with the pristine PAU, the thermal decomposition rates of the PAU composites decreased by 13~17%. In air, the residual weights of PAU/30B, PAU/MP, and PAU/30B/MP were 2.4, 2.3, and 7.3 wt% at
Controlling Pore Size of Electrospun Silk Fibroin Scaffold for Tissue Engineering
Cho, Se-Youn ; Park, Hyun-Ho ; Jin, Hyoung-Joon ;
Polymer Korea, volume 36, issue 5, 2012, Pages 651~655
DOI : 10.7317/pk.2012.36.5.651
Considerable effort has been directed toward the use of silk fibroin as a biotechnological material in biomedical applications on account of its excellent biodegradability, biocompatibility, and unique mechanical properties. For use in tissue engineering, it is very important to design and control the pore architecture of polymeric scaffolds, which provide the vital framework for seeded cells to organize into functioning tissue. In the present study, a silk fibroin scaffold with controlled interconnectivity and pore size was prepared using an electrospinning method with poly(ethylene oxide).
Fabrication of Hybrid Nanocomposites of PAA-grafted Graphene and Pd Nanoparticles having POSS (Pd-POSS)
Lim, Jung-Hyurk ; Ko, Yl-Woong ; Kim, Ki-Young ; Kim, Kyung-Min ;
Polymer Korea, volume 36, issue 5, 2012, Pages 656~661
DOI : 10.7317/pk.2012.36.5.656
The palladium nanoparticles were self-assembled to make Pd-POSS using POSS-
(polyhedral oligomeric silsesquioxane) as a crosslinker. Graphene oxide (GO) was produced by the reaction of graphite under a strong acid and oxidizer and poly(acrylic acid) (PAA) was covalently grafted on the surface of graphene to make PAA-grafted graphene through the radical polymerization of acrylic acid and GO along with a reduction process under
. The nanocomposites of Pd-POSS and PAA-grafted graphene were fabricated via ionic interactions between positively charged Pd-POSS and negatively charged PAA-grafted graphene. Pd-POSS nanoparticles were attached to the surface of PAA-grafted graphene through ionic interactions. The thermal stability of Pd-POSS/PAA-grafted graphene was higher than that of PAA and PAA-grafted graphene. The composition, structure, surface morphology, and thermal stability of the Pd-POSS/PAA-grafted graphene were studied by FE-SEM, AFM, TEM, FTIR, and TGA.
Study on the Improvement of Light Transmittance of Polyester Film
Kim, Si-Min ; Park, Soo-Young ;
Polymer Korea, volume 36, issue 5, 2012, Pages 662~667
DOI : 10.7317/pk.2012.36.5.662
Poly(ethylene terephthalate) (PET) base films with high light transmittance have been used for the substrate of various functional films in the flat panel display. The effects of the reflective index of coated films, the roughness of the film surface and the content of inorganic silica particles on the light transmittance were studied in this article. Light transmittance was increased by coating a water soluble resin with a low reflective index at an optimum thickness. The roughness of the film did not affect light transmittance when the Ra of the film surface was less than a quarter of the wavelength of incident light. Inorganic silica particles decreased light transmittance due to their absorbance and scattering of the incident light.
Spectroscopic Analysis on the Michael Addition Reaction between Secondary Amino Group Containing Silica Nanoparticles with (Meth)acrylate Monomers
Jeon, Ha-Na ; Ha, Ki-Ryong ;
Polymer Korea, volume 36, issue 5, 2012, Pages 668~676
DOI : 10.7317/pk.2012.36.5.668
In this study, we modified silica nanoparticles with bis[3-(trimethoxysilyl)propyl]amine (BTMA) silane coupling agent to introduce secondary amino groups on the silica surface. After modification of silica, we investigated effects of different types of (meth)acrylate group containing monomers on the Michael addition reaction to introduce reactive (meth)acrylate groups on the BTMA modified silica surface. We used two kinds of (meth)acrylate monomers, trimethylolpropane ethoxylate triacrylate (TMPET) which has three identical acrylate groups, and 3-(acryloyloxy)-2-hydroxypropyl methacrylate (AHM) which has one acrylate and one methacrylate group. We used fourier transform infrared spectroscopy (FTIR), elemental analysis (EA) and solid state cross-polarization magic angle spinning (CP/MAS) nuclear magnetic resonance spectroscopy (NMR) to understand reactions between NH groups on the silica surface with (meth)acrylate groups of TMPET and AHM monomers. We found almost complete Michael addition reaction between all three acrylate groups of TMPET with NH groups on the BTMA modified silica. But, for the AHM treatment of BTMA modified silica, we found Michael addition reaction occurred only between acrylate groups of AHM and NH groups of silica surface, not between methacrylate groups of AHM and NH groups of BTMA modified silica surface.