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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 29, Issue 6 - Dec 2005
Volume 29, Issue 5 - Sep 2005
Volume 29, Issue 4 - Jul 2005
Volume 29, Issue 3 - May 2005
Volume 29, Issue 2 - Mar 2005
Volume 29, Issue 1 - Jan 2005
Selecting the target year
Coordination Polymerization of Carbon Double Bond Catalyzed by Organometallic Compounds
Lee Dong-ho ;
Polymer Korea, volume 29, issue 4, 2005, Pages 321~330
In 1990's the Korean polyolefin industry boomed up through the development of magnificient polymerization catalysts. To understand the general situation of polymerization catalyst R & D, the various experimental results had been summarized for the investigation of not only the supported Ziegler-Natta catalyst used presently in polyolefin industry but also the metallocene catalysts applied for the preparation of special grade of polyolefin. In addition, it had been shown that the new polymeric materials were prepared by new developed catalyst, and the polymer in-situ nanocomposites could be obtained with the application of catalyst heterogenization procedures.
Studies on the Electrical Properties and Pattern Fabrication of Conjugated Self-Assembled Monolayer by Deep UV Light
Oh Se Young ; Choi Hyung Seok ; Kim Hee Jeong ; Park Je Kyun ;
Polymer Korea, volume 29, issue 4, 2005, Pages 331~337
In general, alkanethiolates having carboxylic acid in the tail group have been used as biorecepton. In this study, we have immobilized a cytochrome c protein using conjugated aromaticthiolates in order to improve the electrical property and physical stability of alkanethilolates. The pattern formation of self-assembled aromaticthiolate monolayers was as follow. Aromatic thiolates bound on the gold surface by the adsorption of 4'-mercapto-biphenyl-4-carboxylic acid and 4-mercapto-[1,1';4',1']terphenyl-4'-carboxylic acid were oxidized by the irradiation of deep UV light through a negative mask. The negative type pattern of the self-assembled monolayer (SAM) was obtained by developing with a deionized water. The pattern formation and electrical conductivity of aromaticthiolate SAMs was investigated by the measurements of STM and AFM. In addition, cytochrome c or ferrocene amide was immobilized onto the patterned substrate. We also studied on the effect of conjugated aromatic thiolates on the electrical activity of cytochrome c or ferrocene amide by cyclic voltammetry.
Study on the Thermal Decomposition Behavior of[ABS/PC/Triphenyl Phosphate/Transition Metal Chloride] Compounds
Jang Junwon ; Kim Jin-Hwan ; Bae Jin-Young ;
Polymer Korea, volume 29, issue 4, 2005, Pages 338~343
The thermal degradation of ABS/PC/triphenyl phosphate compounds in the presence of transition metal chloride catalysts has been studied by thermogravimetric analysis (TGA). The reaction of transition metal chloride catalysts (cobalt chloride, ferric chloride, nickel chloride and zinc chloride) and ABS/PC/triphenyl phosphate compounds has been found to occur during the thermal degradation of the compounds. In a nitrogen atmosphere, char formation is observed, and
of the reaction product is non-volatile at
. The resulting enhancement of char formation in a nitrogen atmosphere has been explained as a catalytic crosslinking effect of transition metal chloride catalysts. On the other hand, transition metal chloride catalyzed char formation of ABS/PC/triphenyl phosphate compounds in air was unsuccessful due to the oxidative degradation of the char at a higher temperature.
Synthesis and Properties of Polyester System Polyurethane without Solvent
Kwak Noh-Seok ; Yang Yun-Kyu ; Jeong Boo-Young ; Hwang Taek-Sung ;
Polymer Korea, volume 29, issue 4, 2005, Pages 344~349
Polyurethanes(PUs) were synthesized by reaction of isophorone diisocyanate, acetylbutyl citrate, and 3 types of polycaprolactone diol. Their structures were confirmed by FT-IR and NMR spectrometer. And, their thermal and mechanical properties were measured by TGA ud UTM. The effective network chain lengths (
), measured by compressive modulus apparatus, were about
g/mol. As crosslinking density and amount of hard segment increased, tensile strength increased and elongation decreased. As the crosslinking density of PUs increased, thermal property inproved. When the ratio of NCO/OH is 1.1, maximum crosslinking density was achieved.
Preparation and Characterization of Acrylic Bone Cement with Poly(methyl methacrylate)/Montmorillonte Nanocomposite Beads
Lim Jin Sook ; Son Eun Hee ; Hwang Sung-Joo ; Kim Sung Soo ;
Polymer Korea, volume 29, issue 4, 2005, Pages 350~356
Poly(methyl methauylate)/montmorillonite nanocomposites were incorporated into acrylic bone cement in order to improve the mechanical properties and reduce the exotherm of acrylic bone cement. The nanocomposites were prepared using a suspension polymerization and characterized by scanning electron microscopy, X-ray diffraction, trans-mission electron microscopy, gel permeation chromatography, particle size analyzer and electron dispersive spectroscopy. The acrylic bone cements with poly (methyl methacrylate)/nanocomposite s were prepared and their thermal and mechanical properties were characterized. The prepared polymeric beads were composed of polymer-intercalated nanocomposites with partially exfoliated MMT layers, and the mean diameter of them was
fm with the spherical shape. The maximum setting temperature of the acrylic bone cements decreased from 98 to
. The mechanical strengths and moduli of the acrylic bone cement with 0.1
MMT were increased. compared to that without MMT. However, the mechanical properties were generally decreased with increasing incorporated MMT amounts. It is presumably due to the bubbles in nanocomposite beads generated during polymerization.
Synthesis and Characterization of Electroluminescent Conjugated Polymers Containing Sulfone Group in the Main Chain
Kang Min Sung ; Jung Ho Kuk ; Park Soo Young ; Kim Jang-Joo ;
Polymer Korea, volume 29, issue 4, 2005, Pages 357~362
As a new class of electroluminescent (EL) polymers, PPV-based polymers containing sulfone group in the main chain were synthesized through Witting polymerization reaction to control n-conjugation length and energy levels for predictable light emission and enhanced device performance. These EL polymers showed good solubility in common organic solvents and high thermal stability with initial decomposition temperature of ca.
and glass transition temperature around
Emission colors were tuned from green to deep blue by reducing
-conjugated length between sulfone groups. It was also noted from the cyclic voltammetry (CV) measurements and semiempirical calculations that sulfone group with high electron affinity effectively lowered HOMO-LUMO energy levels to enhance EL device performance.
Solvent Effects on the Charge Transport Behavior in Poly(3,4-ethylenedioxythiophene) Synthesized with Iron (III) -p-toluenesulfonate
Park, Chang-Mo ; Kim, Tae-Young ; Kim, Won-Jung ; Kim, Yun-Sang ; Suh, Kwang-S ;
Polymer Korea, volume 29, issue 4, 2005, Pages 363~367
The effects of organic solvent on the charge transport behavior of poly (3,4-ethylenedioxythioph one)/p-toluene-sulfonate(PEDOT-OTs) are investigated. The use of different organic solvents during the oxidative chemical polymerization of 3,4-ethylenedioxythiophene (EDOT) with Iron(III) -tosylate can greatly vary the DC conductivity of PEDOT-OTs along with molecular structure and doping concentration. For example, PEDOT-OTs prepared from methanol shows the conductivity of 19.5 S/cm, which is an increase by a factor of
compared to PEDOT-OTa prepared from acetone. From the X-ray diffraction (XRD) experiments, it was found that PEDOT-OTs with ketone is amorphous state, while PEDOT-OTs with alcoholic solvent shows the better defined crystalline structure in which the charge transport along and between the PEDOT chains are promoted. Chemical analysis employing X-ray photoelectron spectroscopy (XPS) revealed that the doping concentration of PEDOT-OTs with alcoholic solvent is much higher than that of PEDOT-OTs with ketones. It is proposed that the interactions between the organic solvent and doping anion can cause the variation in doping concentration and, therefore, result in the PEDOT-OTs of different conductivities and chain structures.
Preparation and Characterization of Calcium Alginate Microcapsules by Emulsification-Internal Gelation
Park Soo-jin ; Kang Jin-Young ;
Polymer Korea, volume 29, issue 4, 2005, Pages 369~374
In this work, the calcium alginate microcapsules containing lemon oil were prepared by emulsification-internal gelation and their potential use as aromatherapy was examined by the controlled release system. The lemon oil encapsulated in the alginate was successfully observed by Fourier transform (FT-IR) spectroscopy and differential scanning calorimeter (DSC) measurements. Analysis of the diameters and shapes of microcapsules was conducted by scanning electron microscopy (SEM). The mean diameters ranging from 4 to 7 um and encapsulation yield ranging from 50 to
were obtained. The controlled release of the lemon oil at
was demonstrated by the infrared moisture determination (IMDB). It was found that the amount of released lemon oil decreased with increasing concentrations of alginate and
due to the higher the cross-linking density of the capsules prepared. The oil release from the capsule was measured as a function of physical force. We confirmed that the external factor could control the collapse of capsule wall and the release rate.
Thermal and Mechanical Properties with Hydrolysis of PLLA/MMT Nanocomposite
Lee Jong Hun ; Lee Yun Hui ; Lee Doo Sung ; Lee Youn-Kwan ; Nam Jae-Do ;
Polymer Korea, volume 29, issue 4, 2005, Pages 375~379
The morphology and therma]/viscoelastic characteristics were investigated for PLLA/MMT nanocomposite manufactured by incorporating inorganic nanosized silicate nanoplatelets into biodeuadable poly(l-lactic acid) (PLLA). The XRD difiactogram and TEM image may be regarded as a formation of homogeneously dispersed nanocomposites. The melting energy(
) was increased during hydrolysis process because of increase of crystallinity. As MMT played a role of reinforcing agent, the storage modulus was increase in case of PLLA/MMT nanocomposite, it was well coincided with our previous results. From SEM image, many tiny pinholes formed by spinodal decomposition were observed on the surface, and the shape of nanocomposite was maintained during hydrolysis process. In this study, it was shown that the control of biodegradation rate, thermal/mechnical property was possibile by incorporating MMT.
Properties and Performance of Electroactive Acrylic Copolymer-Platinum Composite Modified with Sodium Montrnorillonite
Jeong, Han-Mo ; Kim, Byung-Chon ; La, Young-Soo ;
Polymer Korea, volume 29, issue 4, 2005, Pages 380~384
Fluoroalkyl methacrylate and acrylic acid were bulk radical copolymerized in the presence of pure sodium montmorillonite or macromer intercalated sodium montmorilonite to get a fluorinated acrylic ionomer/sodium montmorillonite composite, and their physical properties, such as X-ray diffraction pattern, tensile properties, and water uptake, were examined. These composites were used to preparean ionic acrylic polymer-platinum composite (IPMC). The current and deformation responses of these IPMCs by external voltage applied across the platinum electrodes deposited on both sides of IPMC showed that the cation migration from anode to cathode was suppressed in the presence of sodium montmorillonite, causing reduced current and deformation.
Crosslinking Characteristics of High Density Polyethylene by Reactive Melt Processing
Lee Jong Rok ; Lee Dong Gun ; Hong Soon Man ; Kang Ho-Jong ;
Polymer Korea, volume 29, issue 4, 2005, Pages 385~391
Reactive melt processing has been carried out to investigate crosslinking characteristics of high density polyethylene OTDPE) with dicummyl peroxide (DCP) and perbutyle peroxide (PBP). The increase of torque in the internal mixer indicated that the crosslinking in HDPE has been occurred by peroxides. As a result, the substantial decrease of density, melting temperature, and melt enthalpy were found while the melt viscosity increased in partially crosslinked HDPE. In the mechanical properties of partially crosslinked HDPE, the increase of maximum strength and the decrease in elongation at break were clearly noticed and these were more pronounced when PBP was applied as a crosslinking agent. It seems that the maximum strength was obtained with reactive processing temperature at
, however, the mixing time did not affect to the strength of partially crosslinked HDPE.
Fabrication of an Alternating Multilayer Film of Poly(ethylene-alt-maleic anhydride) and Poly(4-vinyl pyridine) by Layer-by-Layer Self-Assembly Method
Lee Joon Youl ; Hong Sook-Young ;
Polymer Korea, volume 29, issue 4, 2005, Pages 392~398
Self-assembled multilayer thin films of poly(ethylene-alt-maleic anhydride) (PEMAh) and poly(4-vinyl pyridine) (P4VP) were fabricated by layer-by-layer (LbL) sequential adsorption. Fourier transform infrared (FT-IR) spectroscopic analysis of the self-assembled PEMAh/P4VP multilayer films confirms that the driving forces for the multilayer buildup are the intermolecular hydrogen bonding and electrostatic interactions. The linear increase of absorption peak of P4VP at 256 nm with increasing number of PEMAh/P4VP bilayers indicates that the multilayer buildup is an uniform assembling process. We also investigate the effects of polyelectrolyte concenhation variation of the dipping solution and pH variation of the PEMAh solution on the multilayer film formation. Thickness. adsorbed polyelectrolyte mass and surface roughness of the multilayer films were measured by UV-visible spectroscopy, quartz crystal microbalance (QCM), and atomic force microscopy (AFM), respectively.
Nanocomposite of Ethyl Cellulose Using Environment-Friendly Plasticizer
Choi Sung Heon ; Cho Mi Suk ; Kim Dukjoon ; Kim Ji-Heung ; Lee Dong Hyun ; Shim Sang Joon ; Nam Jae-Do ; Lee Youngkwan ;
Polymer Korea, volume 29, issue 4, 2005, Pages 399~402
In this study, ethyl cellulose (EC)/montmorilloniote(MMT) nanocomposite films plasticized with environmental-friendly plasticizer (BET, EBN, ESO) were prepared by melt process using Hakke mixer. The
of plasticized EC films decreased from 122 to
with the increase in the BET content up to 30
. The addition of 10
epoxidized soybean oil (ESO) as the second plasticizer cause the further drop of
from 81 to
. The plasticizer-effect of BET was better than that of EBN. When the plasticizer was added into the EC films, the mechanical properties of EC films was decreased, however the addition of monotmorillonite (MMT) into the EC films or the ring opening reaction of ESO plasticizer cause enhancement of mechanical properties.
Preparation and Electrochemical Characteristics of Polymer Electrolyte Based on MCM-41/Poly(ethylene oxide) Composites
Kim Seok ; Kang Jin-Young ; Lee Sung-Goo ; Lee Jae-Rook ; Park Soo-Jin ;
Polymer Korea, volume 29, issue 4, 2005, Pages 403~407
In this work, the solid polymer electrolyte (SPE) composites, which are composed of poly(ethylene oxide) (PEO), mesoporous mobil crystalline material-41 (MCM-41), and lithium salt, are prepared in order to investigate the influence of MCM-41 contents on the ionic conductivity of the composites. The crystallinity of the SPE composites was evaluated using differential scanning calorimeter (DSC) and X-ray diffraction (XRD). The ionic conductivity of the SPE composites was measured by the frequency response analyzer (FRA). As a result, the addition of MCM-41 into the polymeric mixture prohibited the growth of PEO crystalline domain due to the mesoporous structures of the MCM-41. The
/MCM-41 electrolytes show an increased ion conductivity as a function of MCM-41 content up to 8
and a slightly decreased conductivity over 8
. These ion conductivity characteristics are dependent on a change of polymer crystallinity in the presence of MCM-41 system.
Structure and Characteristic of Chitosan/Bombyx mori Silk Fibroin Blend Filems
Kim, Dong-Keon ; Kim, Hong-Sung ;
Polymer Korea, volume 29, issue 4, 2005, Pages 408~412
Structure and characteristic of the films blended chitosan matrix with silk fibroin, extracted from Bombyx mori, were studied by X-ray diffraction, differential scanning calorimetry, FT-IR spectra analysis, SEM photographs, contact angle measurement and water absorbency in order to use as biomaterials. The blend films of
fibroin content were prepared in acetic solution with
ion. It was found that the crystallinity of chitosan/fibroin blend films was decreased by the presence of intermolecular interactions such as hydrogen bonding between animo groups of chitosan and carbonyl groups of fibroin. As the proportion of fibroin in the blend increased, anhydrous crystalline phase of chitosan disappeared, and hydrated crystalline phase decreased, and
-structure crystalline phase of fibroin was formed. Therefore the blend films were crystallized into two different crystalline region of chitosan and fibroin. Surface hydrophilicity and water absorbency increased with blending fibroin. Above 20
fibroin content, hydrogel film was formed. The surface and section of the film showed uniform microstructure on SEM photographs.
Liquid Crystal Alignment Stability of Polyvinylcinnamate Photonslignment Layer
Lim Ji-Chul ; Choi Sie-Hyung ; Kim Whanki ; Kim Sung Soo ; Song Kigook ;
Polymer Korea, volume 29, issue 4, 2005, Pages 413~417
Orientations of liquid crystal molecules on a surface of a film of photoreactive polyvinylcinnamate were investigated in order to apply as an alignment layer of LCD. When the polyvinylcinnamate film was exposed to linearly polarized W light, optical anisotropy was induced in the film through a selective photoreaction. Liquid crystal molecules on a surface of the film was aligned along the oriented polymer chain direction through intermolecular interactions. Thermal and light stability of the photoaligned LC cell were studied by investigating LC alignment changes after the alignment layer was treated with heat and W light. When the film was exposed with linearly polarized UV several times, the LC alignment was induced only along the final UV exposure direction.
Fabrication of Three-Dimensional Curved Microstructures by Two-Photon Polymerization Employing Multi-Exposure Voxel Matrix Scanning Method
Lim, Tae-Woo ; Park, Sang-Hu ; Yang, Dong-Yol ; Kong, Hong-Jin ; Lee, Kwang-Sup ;
Polymer Korea, volume 29, issue 4, 2005, Pages 418~421
Three-dimensional (3D) microfabrication process using two-photon polymerization (TPP) is developed to fabricate the curved microstructures in a layer, which can be applied potentially to optical MEMS, nano/micro-devices, etc. A 3D curved structure can be expressed using the same height-contours that are defined by symbolic colors which consist of 14 colors. Then, the designed bitmap figure is transformed into a multi-exposure voxel matrix (MVM). In this work a multi-exposure voxel matrix scanning method is used to generate various heights of voxels according to each laser exposure time that is assigned to the symbolic colors. An objective lens with a numerical aperture of 1.25 is employed to enlarge the variation of a voxel height in the range of 1.2 to 6.4 um which can be controlled easily using the various exposure time. Though this work some 3D curved micro-shapes are fabricated directly to demonstrate the usefulness of the process without a laminating process that is generally required in a micro-stereolithography process.