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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 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
Interfacial Characteristics of Polymeric Composite Materials
Park Soo-Jin ; Seo Min-Kang ;
Polymer Korea, volume 29, issue 3, 2005, Pages 221~230
Interfacial interactions and interphases played a key role in multicomponent materials irrespectively of the number and type of their components or their actual structure. They were equally important in particulate filled polymer, polymer blends, fibers-reinforced advanced composites, nanocomposites or biomimetic materials. Recognition of the role of the main factors influencing interfacial adhesion and proper surface modification could lead to significant progress in many fields of research and development, as well as in related technologies. Although the role and importance of interfaces and interphases were the same for all multicomponent materials, the surface modification could be always selected according to the objectives targeted, as well as to the characteristics of the particular system. In this wort therefore, several types of surface modification were performed to improve the interfacial interactions between two components in composite system and their results for the composites were investigated.
Synthesis of Modified Polyetherimide and Toughening of Epoxy Resin
Lee Sin Duk ; Ahn Byung Hyun ; Lee Kwang Gi ; Kim Won Ho ;
Polymer Korea, volume 29, issue 3, 2005, Pages 231~236
Amino terminated polyetherimide (AP-PEI) has been synthesized using 2,2'-bis [4-(3,4-dicarboxyphenoxy)-phenyl]propane dianhydride (BPADA) and m-phenylenediamine. Polyetherimide containing pendant carboxy group (CP-PEI) has also been synthesized by the reaction of BPADA, m-phenylenediamine and 3,5-diaminobenzoic acid. The modified PEIs were used as toughening agent for diglycidyl ether of bisphenol-A epoxy resin which was cured with nadic methyl anhydride (NMA). Thermal properties, fracture toughness (
) and solvent resistance of toughened epoxy resin were measured. The
of epoxy resin containing 20 phr of AT-PEI was 2.88
without sacrificing thermal properties. The
of epoxy resin which contained 20 phr of CP-PEI was 2.82
Synthesis and Properties of Photocurable Pentaerythritol Modified Hyperbranched Acrylate
Kim Dong Kook ; Lim Jin Kyu ; Kim Woo Geun ; Heo Jung Lim ;
Polymer Korea, volume 29, issue 3, 2005, Pages 237~241
Photocurable pentaerythritol modified hyperbranched acrylates were prepared from trimellitic anhydride, glycidyl methacrylate and pentaerythritol derivatives. Thermal stability obtained by using TGA showed that HBMA-1 was superior to the others. Hardness, abrasion resistance and tensile strength of HBMA-1 showed that Hey were also superior to the others. Value of yellow index of HBMA-1 showed the lowest.
Properties of Sol-Gel Materials Synthesized from Colloidal Silica and Alkoxy Silanes
Kang Dong-Pil ; Park Hoy-Yul ; Ahn Myeong-Sang ; Myung In-Hye ; Lee Tae-Ju ; Choi Jae-Hoon ; Kim Hyun-Joong ;
Polymer Korea, volume 29, issue 3, 2005, Pages 242~247
Two kinds of colloidal silica(CS)/silane sol solutions were prepared in variation with synthesizing parameters such as kinds of CS, ratio of CS to silane and reaction time. Such sol solutions were obtained from 1034A Cs/methyl-trimethoxysilane(MTMS) and HSA CS/MTMS solutions. In the case of 1034A CS/MTMS CS/silane sol, coating film had high contact angle and more enhanced flat surface than those in the case of HSA CS/MTMS sol. In the case of thermal stability, thermal dissociation of 1034A CS/MTMS sol did not occur up to
. The thickness of coating film obtained from 1034A CS/MTMS sol increased with increasing the amount of MTMS. The hardness of coating films obtained from 1034A CS/MTMS sol decreased with increasing the amount of MTMS. Surface free energy of CS/silane sol-gel coating film decreased with increasing amount of MTMS.
Flame Retardancy of Polypropylene/Montmorillonite Nanocomposites
Lee Sung-Goo ; Won Jong Chan ; Lee Jae-Heung ; Choi Kil-Yeong ;
Polymer Korea, volume 29, issue 3, 2005, Pages 248~252
PP/MMT nanocomposites having a various compositions were prepared by melt blending with a twin screw extruder. In this study, maleic anhydride-grafted PP (MAH-g-PP) was used as a compatibilizer in order to assist the exfoliation or hen in the pp matrix. from the results or x-ray diffraction (XRD) and transmission electron microscope (TEM) measurements for the nanocomposites, we confirmed that MMT was exfoliated. PPM nanocomposites have shown good flame retardancy by synergistic effect between MMT and flame retardant. The mechanical and thermal properties of the nanocomposites showed significant enhancement compared with those of neat PP, The excellent flame retardancy of the PP/MMT nanocomposites, UL94 V-0 value, was successfully obtained with reduced amount of the flame retardant.
Synthesis and Physical Properties of Polycaprolactone Based Polyurethanes Using Aliphatic or Aromatic Diisocyanates
Kim Sun-Mi ; Kwak Noh-Seok ; Yang Yun-Kyu ; Yim Bong-Kyun ; Park Bo-Young ; Hwang Taek-Sung ;
Polymer Korea, volume 29, issue 3, 2005, Pages 253~259
Polyurethanes, synthesized by polyester polyols and aliphatic or aromatic diisocyanates for a crease resist finishing agent, were prepared by two-step reactions, that is, prepolymer synthesis and chain extension. The structures of synthesized polyurethanes were confirmed by the measurement of FT-IR and
-NMR spectrometer. The number average molecular weight (
) and the weight average molecular weight (
) of the polyurethane with aromatic diisocyanate (MDI) were higher than those of the synthesized polyurethanes with aliphatic diisocyanate (HDI,
). The glass transition temperatures (
) of soft segments in polyurethanes with MDI, HDI,
were -25,-42 and -50
, respectively. In the polyurethanes obtained by two-step reaction, thermal stability and tensile strength increased with increasing hard segment contents, whereas elongation at break decreased with increasing hard segment contents.
Preparation of Double Layered Nanosphere Using Dextran and Poly(L-lactide- co-glycolide)
Hong Keum Duck ; Ahn Yong San ; Go Jong Tae ; Kim Moon Suk ; Yuk Soon Hong ; Shin Hyung Sik ; Rhee John M ; Khang Gilson ; Lee Hai Bang ;
Polymer Korea, volume 29, issue 3, 2005, Pages 260~265
The initial burst of drug release is an important role in the controlled delivery of drug having hish toxicity and narrow therapeutic ranges. Nanosphere composed of monolayer could not achieve precisely controlled drug release because of the initial burst of drug on surface. In this study, double layered nanosphere was prepared for sustained drug delivery without initial burst. Double layered nanosphere composed of dextran and PLGA was fabricated by using conventional W/O/W double emulsion method. To control surface tension on the outer layer of nanospheres, PVA was used as a surfactant. Release behavior of dextran as model drug was observed as the
mm wafers formed by compression mould in the deionized water for 7 days. Double layered nanosphere has sustained release behavior, in contast to single layered nanospheres. such as mechanical mixture and dextran nanospheres. Especially, nanosphere containing PVA
has shown nearly the zero-order release profile. As a result of this study, double layered nanospheres has more sustained release profile of drug without the initial burst and the release behavior of dexoan on tile double layered nanospheres was controlled by the contents of PVA as a surfactant.
Preparation of Poly(vinylpyrrolidone) Coated Iron Oxide Nanoparticles for Contrast Agent
Lee Ha Young ; Lim Nak Hyun ; Seo Jin A ; Khang Gilson ; Kim Jungahn ; Lee Hai Bang ; Cho Sun Hang ;
Polymer Korea, volume 29, issue 3, 2005, Pages 266~270
Iron oxide nanoparticles were prepared by the thermal decomposition of iron pentacarbonyl (Fe(CO)
) Poly(vinylpyrrolidone) (PVP) was used as surface-modifying agent to control the size of the iron oxide nanoparticles. The crystalline structure of PVP coated iron oxide nanoparticles was determined by XRD. The size of PVP coated iron oxide nanoparticles was determined by TEM and ELS. The particle sizes of PVP coated iron oxide nanoparticles were controlled by adjusting the molar ratio of PVP/Fe (CO)
, solvent and molecular weight of PVP Particle sizes increased with increasing PVP content. Spherical
nm sized iron oxide nanoclusters were produced when dimethylformamide was used as a solvent. And well-defined 10 nm iron oxide nanoparticles were produced in Carbitol. The prepared PVP coated iron oxide nanoparticles exhibited a well-dispersed property in water. The results obtained in this study confirmed the feasibility of the PVP-coated iron oxide nanoparticles as a biomaterial for MRI contrast agent.
Preparation and Characterization of Polypropylene/Montmorillionite Nanocomposites
Lee Sang-Uk ; Oh In-Hwan ; Lee Jae Heung ; Choi Kil-Yeong ; Lee Sung-Goo ;
Polymer Korea, volume 29, issue 3, 2005, Pages 271~276
Polypropylene (PP)/montmorillonite (MMT) nanocomposites were prepared by melt mixing methods. MMT modified by dimethyl hydrogenated tallow 2-ethylhexyl ammonium (Cloisite 15A) was used. Polyolefine oligomer with telechelic OH groups was used as a compatibilizer. The degree of dispersion of MMT in the nanocomposites was measured by X-ray diffractometer and transmission electron microscope (TEM) images. MMT was well exfoliated when the contents of compatibilizer was 25 phr. The thermal stability that observed by thermogravimetric analysis (TGA) increased with the contents of MMT increased up to 5 phr. The complex viscosities and storage moduli of PP nanocomposites enhanced as the contents of compatibilizer decreased and those of MMT increased.
Preparation of Cationic Liposomes Modified by Polyethylenimine and Their Application as Gene Carrier
Seo, Dong-Hoan ; Shin, Byung-Cheol ; Kim, Moon-Suk ;
Polymer Korea, volume 29, issue 3, 2005, Pages 277~281
Recently, various curriers prepared by the modification both cationic polymers and liposomes have been examined. In this work, we prepared the lipid with polyethylenimine (PEI) to investigate the possibility as effective DNA carrier. Cationic lipid (PEI-DSPE) was synthesized by the reaction of PEI and 1,2-diacyl-sn-glycero-3-phosphoetha-nolamine (DSPE). The liposomes were prepared by the concenoation changes of PEI-DSPE for a mixture of 1,2-disteanyl-sn-glycero-3-phosphocholine (DSPC), L-
-phosphatidylcholine, hydrogenated (HSPC) and cholesterol (CHOL). Particle size decreased as PEI-DSPE concentration increased. In addition, the charge of liposome surface increased to positive value according to increasing the relative of PEI-DSPE concentration. The complexation of DNA was confirmed by gel retardation assay and fluorescence measurement. The surface charge of liposome/DNA complexes increased as the liposome concentration or surface charge of liposome increased. In conclusion, we confirmed that the prepared liposomes have the possibility as a DNA carrier.
Preparation and Release Behavior of Albumin-Loaded PLGA Scaffold by Ice Particle Leaching Method
Hong Keum Duck ; Seo Kwang Su ; Kim Soon Hee ; Kim Sun Kyung ; Khang Gilson ; Shin Hyung Sik ; Kim Moon Suk ; Lee Hai Bang ;
Polymer Korea, volume 29, issue 3, 2005, Pages 282~287
A novel ice particle leaching method for fabrication of porous and biodegradable PLGA scaffold has been proposed for the application to tissue engineering. After uniform mixing of poly(L-lactide-co-glycolide) (PLGA) and bovine serum albumin-fluorescein isothiocyanate (FITC-BSA), the FITC-BSA loaded scaffold was fabricated by adding various ratio of ice particle. The release profiles of FITC-BSA were examined using pH 7.4 PBS for 28 days at
. The release amount was determined by fluorescence intensity by using the fluorescence spectrophotometer and the morphological change of the scaffolds was observed by scanning electron microscope. The release initial burst of BSA containing scaffolds was lower than that of simple dipping scaffolds resulting in constant release aspect. Although the BSA concentration increased. the initial burst was not increased. As a result of this study, it can be suggested that ice particle leaching method for the tissue engineered scaffold miff be very useful and it is possible to impregnate with water soluble factors like cytokine. We suggest that ice particle leaching method may be useful to tissue engineered organ regeneration.
The Effect of Bead Size and Drug Solubility on Drug Release from Osmotic Granule Delivery System for Nifedipine
Jeong Sung Chan ; Chon Se Kang ; Jo Young Ho ; Kim Moon Suk ; Lee Bong ; Khang Gilson ; Lee Hai Bang ;
Polymer Korea, volume 29, issue 3, 2005, Pages 288~293
Osmotic granule system which is one of the drug delivery systems has been developed to improve manufacturing process and other problems of tablet osmotic systems. It consists of water swellable seed layer, nifedipine drug layer, and drug release controlled membrane layer and manufactured by fluidized bed coater. The granule size and mombrane thickness can be controlled by various amounts of seed and coating solution, respectively. It could be observed that the morphology of osmotic granule was different at each coating step as well as type of coating solution. The bigger the size of granule, the slower the release rate was observed due to decreasing the total specific surface wed of granule. Also, it was observed that the increase of membrane thickness was caused to retard the dissolution of nifedipine due to decreasing the water absorption rate. The drug solubility for dissolution media is greatly affected to nifedipine release. From these results, we assured that osmotic granule can be fabricated by fluidized bed coating methods, and the appropriate release profile could be controlled by the controlling of bead size, membrane thickness and dissolution media.
Cell Co-culture Method by Patterned Gratt of Thermo-Responsive Polymer
Bae Jin Suk ; Ahn Chang Hyun ; Yoon Kwan Han ; Kwon Oh Hyeong ; Kang Inn-Kyu ; Yamato Masayuki ; Kikuchi Akihiko ; Okano Teruo ;
Polymer Korea, volume 29, issue 3, 2005, Pages 294~299
Thermo-responsive poly(N-isopropylacrylamide) (PIPAAm) was covalently patterned by masked el electron beam irradiation. Introduction of PIPAAm on tissue culture polystyrene dish was confirmed by ATR-FTIR and ESCA measurements. Hepatocytes were cultured at
on these surfaces. Cells adhered on PIPAAm-grafted domains were detached by reducing culture temperature to
. Endothelial cells were then seeded and cultured on the same surfaces. Seeded endothelial cells were selectively attached on hepatocytes detached and PIPAAm-grafted domains and could be co-cultured with hepatocytes on the same culture dishes with clear pattern. This co-culture method enabled long-term co-culture of hepatocytes with endothelial cells.
Damping and Transmission Loss of Polyurethane Multi-Layer
Lee Yong Geon ; Lim Yi Rang ; Kwon Oh Hyeong ; Yoon Kwan Han ;
Polymer Korea, volume 29, issue 3, 2005, Pages 300~303
Polyurethane multi-layer and foam multi-layer were prepared with PU1000 and PU2000 made by poly(propylene glycol) (PPG) having the molecular weight of 1000 and 2000 g/mol, respectively. The damping and transmission loss of these materials were compared with PU1000 used as a reference. The damping peak of polyurethane multi-layer was shifted to the lower temperature compared with PU1000, while the damping peak of polyurethane foam multi-layer was shifted to the higher temperature and broaden. In terms of noise reduction, the transmission loss of polyurethane multi-layer was effective at the specific frequency range such as less than 100 Hz and around 600 Hz compared with PU1000. The transmission loss of polyurethane foam multi-layer was most effective in the whole experimental frequency range.
Acid-Catalyzed Hydrolysis Reaction of Poly(vinyl acetate)
Park, Sang-Soo ; Yoon, Hi-Sook ;
Polymer Korea, volume 29, issue 3, 2005, Pages 304~307
The acid-catalyzed hydrolysis reaction of poly(vinyl acetate) (PVAc) in water/acetic acid solution at
was studied at two different solvent compositions. The mole fractions of vinyl acetate (Vac) and vinyl alcohol (VA) during the course of the reaction were determined by NMR, and the equilibrium constant
of the reaction was determined using the molar ratio of VAc to VA at the chemical equilibrium.
was 0.75 (
) when the VAc mole faction at the equilibrium was 0.78 (
) and it was 0.69 (
) when the VAc mole fraction was 0.57 (
0.02). The reaction was found to be a pseudo 1-st order reaction with the rate coefficient at
Liquid Crystal Alignment by Photoreactive 4-Hydroxyazobenzene Thin Film
Lee, Won-Ju ; Kim, Whan-Ki ; Song, Ki-Gook ;
Polymer Korea, volume 29, issue 3, 2005, Pages 308~313
The effects of molecular environments on photoisomerization of an azobenzene group were investigated using In-situ UV/Vis spectroscopy and optical anisotropy measurement technique. The reversible and repeatable photoisomeritation reactions of azobenzene were observed by irradiating the film containing 4-hydroxyazobenzene and by measuring absorption intensities of the characteristic bands of trans and cis isomers simultaneously. When the self-assembled monolayer with azobenzene groups was used as an alignment layer for a liquid crystal cell, the homeotropic alignment was induced due to their compact packing structures of azobenfene groups along the vertical direction of the substrate. By irradiating UV light on this cell, the trans-azobenzene groups change to cis-isomers through the photoisonlerieation and then resulting in the planar alignment of liquid crystal molecules.
New Aliphatic Diol/Dicarboxylic Acid Based Biodegradable Polyesters and Their in-vitro Degradations
Kang Tae-Gon ; Han Yang-Kyoo ;
Polymer Korea, volume 29, issue 3, 2005, Pages 314~319
Four kinds of new aliphatic diols were synthesized by the ring opening reaction of glycolide with 1,4-butanediol, 1,6-hexanediol, 1,4-cyclohexanediol, or 1,4-cyclohexanedimethanol, a difunctional initiator, in the presence of stannous octoate catalyst. The resulting diols were melt-polymerized with succinic acid, adipic acid, or suberic acid at 170, 190, or
to produce new sequentially ordered aliphatic polyesters and their corresponding polyesters with random structure. Their glass transition temperatures (
) ranged from -40 to
, The sequentially ordered polyesters prepared at
of 5 to
than the polyesters with rand()m structure produced at higher temperature. From in-vitro degradation test the sequentially ordered polyesters was shower in the rate of hydrolysis in a buffer solution than the polymers with random molecular structure