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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 32, Issue 6 - Nov 2008
Volume 32, Issue 5 - Sep 2008
Volume 32, Issue 4 - Jul 2008
Volume 32, Issue 3 - May 2008
Volume 32, Issue 2 - Mar 2008
Volume 32, Issue 1 - Jan 2008
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Synthesis, Characterization, and Thermal Degradation of Oligo-2-[(pyridin-4-yl-)methyleneamino]pyridine-3-ol and Oligomer-Metal Complexes
Kaya, Ismet ; Gul, Murat ;
Polymer Korea, volume 32, issue 4, 2008, Pages 295~304
This study examined the oxidative polycondensation reaction of 2-[(pyridin-4-yl-) methyleneamino] pyridine-3-ol (2-PMAP) using air
and NaOCl oxidants at various temperatures and times in aqueous alkaline and acidic media. Under these reactions, the optimum reaction conditions using air
and NaOCl oxidants were determined for 2-PMAP. The number-average molecular weight (
), weight average molecular weight (
), and polydispersity index (PDI) values of O-2-PMAP synthesized in aqueous alkaline media were found to be 960, 1230, and
using NaOCl, and 1030, 1520, and
, respectively. At the optimum reaction conditions, the yield of O-2-PMAP in aqueous alkaline media was 92.50% and 85.70% for air
and NaOCl oxidants, respectively. The yield of O-2-PMAP in aqueous acidic media was 88.5% and 88.0% for NaOCl and air
oxidants, respectively. O-2-PMAP was characterized by
-NMR, FT-IR, UV-vis, SEC, and elemental analysis. TGA-DTA analysis revealed O-2-PMAP and its oligomer metal complex compounds, such as
, to be stable against thermal decomposition and their weight losses at
were found to be 73.0, 58.0, 53.5%, and 50.0%, respectively. In addition, the antimicrobial activities of the monomer and oligomer were tested against E. Coli (ATCC 25922), E. Faecelis (ATCC 29212), P. Auroginasa (ATCC 27853), and S. Aureus (ATCC 25923).
Study of Synthesis and Property of Eu-PEG Phase Change Luminescent Materials
Gu, Xiao-Hua ; Xi, Peng ; Shen, Xin-Yuan ; Cheng, Bo-Wen ;
Polymer Korea, volume 32, issue 4, 2008, Pages 305~312
A novel TPC-PEG-TPC with active end-groups was obtained from the end-groups of polyethylene glycol (PEG) modified by terephthaloyl chloride (TPC). These active end-groups can link up with a rare earth ion, which is a luminescent center of a rare earth fluorescent complex. Complexes of Eu-PEG with novel ligands (TPC-PEG-PTC) were synthesized by the coordination of the active reactant (as the first ligand) and phenanthroline (as the second ligand) with
-NMR, element analysis, DSC, WAXD, fluorescent spectroscopy, TGA, and SEM were used to characterize the structure and properties of these complexes. The results showed that this type of complex is a heat storage material with the phase change character of polyethylene glycol (PEG) and the luminescent properties of europium. There was no thermal decomposition of the complex of Eu-PEG until
. SEM showed that the complex of Eu-PEG can be dispersed in PE.
The Peel Energy Behavior of UV-Cured Acrylic PSAs
Son, Hee-Chul ; Kim, Ho-Gyum ; Lee, Dong-Ho ; Min, Kyung-Eun ;
Polymer Korea, volume 32, issue 4, 2008, Pages 313~321
Acrylic pressure sensitive adhesive(PSA) was prepared by UV radiation curing and the peel energy and physical properties of PSA were investigated. The increase of amount of acrylic acid leads to improve the peel energy, associated with the substrate having smooth surface and high layer thickness. The high peel energy is obtained when the direction of irregularity in substrate is horizontal with the peeling direction. This is attributed to the increase of resistance to peeling in spite of decrease of wetting and the result corresponds to our supposition.
Controlled Release of Doxazosin in Multi-layered Pellet Using Polymer Blending
Youn, Ju-Yong ; Park, Sang-Wook ; Lee, Soo-Young ; Kim, Moon-Suk ; Lee, Bong ; Khang, Gil-Son ; Lee, Hai-Bang ;
Polymer Korea, volume 32, issue 4, 2008, Pages 322~327
In this study, a multi-layered pellet was composed of a seed layer including a water-swellable agent and a drug layer containing doxazosin as a model drug, a porous membrane and a castor oil layer to control drug release. The pellet is prepared by a fluidized bed coating method. To confirm drug release from polymer blending in multi-layered pellet system, it is prepared by containing different ratio such as hydroxypropylmethylcellulose (HPMC) : ethyl cellulose (EC) in drug layer and cellulose acetate(CA) : Eudragit RS in membrane. Also, to confirm the effect of oil in drug release, castor oil is coated. As a result, we observed regularly spherical pellet with diameter of
. Release pattern of drug is confirmed by dissolution tester in aqueous media. The more the ratio of EC in drug layer, CA in membrane, and castor oil layer in pellet, the less the drug release is observed. Formation and the amount of pores in membrane is observed by SEM.
Controlled Release of Nifedipine from Osmotic Pellet Based on Porous Membrane
Youn, Ju-Yong ; Ku, Jeong ; Kim, Byung-Soo ; Kim, Moon-Suk ; Lee, Bong ; Khang, Gil-Son ; Lee, Hai-Bang ;
Polymer Korea, volume 32, issue 4, 2008, Pages 328~333
The osmotic delivery systems are based on osmosis. The transverse diffusion of water through a porous membrane from a medium with a low osmotic pressure to a medium with a high osmotic pressure. Nifedipine tablet dosage forms of Procardia
(Bayer) are commercialized systems of this type that push-pull osmotic tablet operates successfully in delivering water-insoluble drugs. We prepared osmotic pellet system by fluidized bed coating method, and model-drug used nifedipine. The osmotic pellet system was composed of the core material. the swelling and osmotic pressure layer, the drug coating layer, and the porous membrane. This work is performed to investigate the effect of different factors, such as composition and thickness of membrane. The osmotic pellet has been successfully prepared by fluidized bed coating technology. The drug release behavior depended on the increase of CA ratio and thickness in porous membrane. The morphology of the osmotic pellet before and after the dissolution test were observed by SEM. In conclusion, we found that the drug release of osmotic pellet depended on the composition and coating thickness of porous membrane.
Electrohydrodynamic Process Supplemented by Multiple-Nozzle and Auxiliary Electrodes for Fabricating PCL Nanofibers
Yoon, Hyeon ; Kim, Geun-Hyung ; Kim, Wan-Doo ;
Polymer Korea, volume 32, issue 4, 2008, Pages 334~339
Recently electro spinning is a widely used simple technique to prepared micro- to nanometer-sized fiber of various polymers. In general, a normal multiple-nozzle electro spinning system has been difficult to achieve high production-rate fabricating micro/nanofibers due to the interference of electric field between individual nozzles in the process. To reduce the interference effect of electric field between nozzles, we developed a multi-nozzle electrospinning system supplemented with auxiliary electrodes. Poly(
-carprolactone)(PCL), which has good mechanical property and biocompatibility, was electrospun by the multi-nozzle electro spinning system. Electrospinnability, product rate, and size uniformity of spun fibers for the system with and without auxiliary electrodes were characterized. As a result, the multi-nozzle electrospinning system supplemented with auxiliary electrodes provides excellently stable processability and showed high mass productivity of PCL-nanofibers relative to a normal multi-nozzle electro spinning system.
Dispersity of CNT and GNF on the Polyurethane Matrix: Effect of Polyurethane Chemical Structure
Im, Hyun-Gu ; Kim, Hyo-Mi ; Kim, Joo-Heon ;
Polymer Korea, volume 32, issue 4, 2008, Pages 340~346
The aim of this study is to understand the effect of structure on the dispersion of both CNT and GNF in the phase of synthesized polyurethanes matrix. Various CNT/PU and GNF/PU composite films were prepared. Polyurethane having a different hard segment was blended with both CNT and GNF. PU having HDI as hard segment showed good dispersion with both CNT and GNF because of their linear structural character and molecular kinesis while PU having aromatic ring showed poor dispersion with those due to their structural complexity. Structural effect also induced the increase of its electro conductivity. The PU/CNT composite showed a bad dispersion (because of phase separation between PU matrix and CNT) but good electro conductivity at its surface (because CNT was collected on the surface of composite film due to low density of CNT). PU/CNT and PU/GNF composite films have quite low normalized sheet resistance value compared with silver/PU nanocomposite film because the fiber type filler could have much more contact points than that of sphere shaped silver particles have.
Synthesis and Properties of High Impact Polystyrene Nanocomposites Based upon Organoclay Having Reactive Group
Hwang, Sung-Jung ; Chung, Dae-Won ; Lee, Seong-Jae ;
Polymer Korea, volume 32, issue 4, 2008, Pages 347~352
High impact polystyrene (HIPS) nanocomposites with organically modified montmorillonite (organoclay) via in situ polymerization were synthesized, and the effects of organoclay incorporation on material properties were investigated. Organoclays having a reactive group, vinylbenzyltrimethyl clay (VBC) and octadecylvinylbenzyldimethyl clay (ODVC), were prepared by the ion-exchange reactions of sodium montmorillonite with vinylbenzyltrimethyl ammonium chloride (VBTMAC) and octadecylvinylbenzyldimethyl ammonium bromide (ODVBDAB), respectively, and a commercial organoclay,
10A(C10A), was used for comparison. It was confirmed that the X-ray diffraction (XRD) peak of the nanocomposites prepared by ODVC disappeared, which indicates the exfoliation of silicate layers. On the contrary, the XRD peak of the nanocomposites prepared by C10A shifted to lower angle, indicative of the intercalation of polymer chains into silicate layers. Rheological properties such as storage modulus and complex viscosity increased with increasing organoclay.
Preparation and PTC Characteristics of Poly(dimethylsiloxane) Modified EPDM/HDPE Composite
Kang, Doo-Whan ; Kim, Sung-Soo ;
Polymer Korea, volume 32, issue 4, 2008, Pages 353~358
Maleated ethylene-propylene-diene terpolymer (MEPDM) was prepared from solution polymerization of EPDM and maleic anhydride. MEPDM-grafted-poly (dimethylsiloxane) (PDMS) copolymer (MEPDM-g-PDMS) was prepared from copolymerization of MEPDM with
-hydroxyl group terminated PDMS. The MEPDM-g-PDMS was compounded with HDPE and 4-ethoxybenzoic acid modified MWCNT at
and positive temperature coefficient (PCT) behavior of the MWCNT composite was investigated. Surface modification of MWCNT enabled it to be more uniformly dispersed in polymer matrix and decreased aggregation of particles. Electrical resistivity of the composite was abruptly increased at melting temperature and PTC intensity of 2.3 was obtained at 15% loading of surface modified CNT.
Fabrication and Characterization of Thermo-responsive Nanofibrous Surfaces Using Electron Beam Irradiation
Jeon, Hyeon-Ae ; Oh, Hwan-Hee ; Kim, Young-Jin ; Ko, Jae-Eok ; Chung, Ho-Yun ; Kang, Inn-Kyu ; Kim, Won-Il ; Kwon, Oh-Hyeong ;
Polymer Korea, volume 32, issue 4, 2008, Pages 359~365
We have fabricated a novel thermo-responsive nanofibrous surfaces by grafting PIPAAm by electron beam irradiation onto poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(PHBV) nanofibrous mats. The electrospun PHBV nanofiber structures revealed randomly aligned fibers with average diameter of 400 nm. Increased atomic percent of nitrogen was observed on the PIPAAm-grafted PHBV mats after electron beam irradiation determined by ESCA. The amounts of PIPAAm-grafted onto PHBV films were
determined by ATR-FTIR. The PIPAAm-grafted surfaces exhibited decreasing contact angles by lowering the temperature from 37 to
, while ungrafted PHBV surfaces had negligible contact angle change. This result indicates that PIPAAm surfaces, which are hydrophobic at the higher temperature, became markedly more hydrophilic in response to a temperature reduction due to spontaneous hydration of the surface-grafted PIPAAm. Thermo-responsive nanofibers showed good tissue compatibility. Cultured cells were well detached and recovered from the surfaces by changing culture temperature from 37 to
Kinetic Studies on Homopolymerization of
-Methylstyrene and Sequential Block Copolymerization of Isobutylene with
-Methylstyrene by Living/Controlled Cationic Polymerization
Wu, Yibo ; Guo, Wenli ; Li, Shuxin ; Gong, Huiqing ;
Polymer Korea, volume 32, issue 4, 2008, Pages 366~371
The controlled/living cationic polymerization of
) and sequential block copolymerization of isobutylene (IB) with
were achieved using 2-chloro-2,4,4-trimethylpentane (TMPCl)/titanium tetrachloride (
)/titanium isopropoxide (
)/2,6-ditert-butylpyridine (DtBP) initiating system in
/hexane(50/50 v/v) solvent mixture at
. The polymerization rate decreased with increasing
ratio in the homopolymerization of
. The effects of
molecular weight on the polymerization rate and blocking efficiency were also investigated. Well-defined poly(isobutylene-b-
-methylstyrene)s were demonstrated by
-NMR and triple detection SEC; refractive index (RI), multiangle laser light scattering (MALLS) and ultraviolet (UV) detectors. Blocking efficiencies for the poly(isobutylene-b-
-methylstyrene)s of almost 100% were obtained when
was induced by PIB's of
. Differential scanning calorimetry (DSC) of the block copolymers showed two glass transition temperatures, thereby demonstrating microphase separation.
Enhanced Efficiency of Organic Electroluminescence Diode Using 2-TNATA:C60 Hole Injection Layer
Park, So-Hyun ; Kang, Do-Soon ; Park, Dae-Won ; Choe, Young-Son ;
Polymer Korea, volume 32, issue 4, 2008, Pages 372~376
Vacuum deposited 4,4',4"-tris(N-(2-naphthyl)-N-phenylamino)-triphenylamine (2-TNATA), used as a hole injection (HIL) material in OLEDs, is placed as a thin interlayer between indium tin oxide (ITO) electrode and a hole transporting layer (HTL) in the devices. C60-doped 2-TNATA:C60 (20 wt%) film was formed via co-evaporation process and molecular ordering and topology of 2-TNATA:C60 films were investigated using XRD and AFM. The J-V, L-V and current efficiency of multi-layered devices were characterized as well. Vacuum-deposited C60 film was molecularly oriented, but neither was 2-TNATA:C60 film due to the uniform dispersion of C60 molecules in the film. By using C60-doped 2-TNATA:C60 film as a HIL, the current density and luminance of a multi-layered ITO/2-TNATA:C60/NPD/
/LiF/Al device were significantly increased and the current efficiency of the device was increased from 4.7 to 6.7 cd/A in the present study.
Synthesis of Microspheric Silicone Polymer Beads by UV Irradiation and Alkoxy Hydrolysis
Park, Seung-Wook ; Kim, Jung-Joo ; Hwang, Eui-Hwan ; Hwang, Taek-Sung ;
Polymer Korea, volume 32, issue 4, 2008, Pages 377~384
In this study, the microsphere silicone polymer beads were synthesized by UV irradiation and alkoxy hydrolysis. The coefficient of variation (CV) of microsphere silicone polymer beads were decreased with increasing UV intensity, reaction time. The mean particle diameter, refractive index, and pH value were
, 1.43 and 7.5, respectively. Also, the true and bulk specific gravity, moisture content were 1.30, and 0.40, below 2%. The mean particle diameter and CV were the lowest at 0.1 wt% hexamethyldisilazane (HMDS) and their roundnesses were
values. The particle dispersion index of microsphere silicone polymer beads was 4.92 at 450 W, 90 min and the yield was increased to 11.3% at 20 wt% methyltrimethoxysilane (MTMS). The mean particle diameter was decreased with increasing the stirring rate and reaction temperature.
Synthesis of High Molecular Weight Poly(Hexafluoropropylene Oxide) by Anionic Polymerization
Lee, Sang-Goo ; Ha, Jong-Wook ; Park, In-Jun ; Lee, Soo-Bok ; Lee, Jong-Dae ;
Polymer Korea, volume 32, issue 4, 2008, Pages 385~389
Chain propagation and chain transfer in anionic polymerization of hexafluoropropylene oxide were investigated under various reaction conditions such as the stabilization of reaction temperature, the amount of hexafluoropropylene solvent, and the feeding rate of hexafluoropropylene oxide monomer. Anionic initiator for the polymerization was synthesized from cesium fluoride and hexafluoropropylene oxide in tetraethyleneglycol dimethylether. It was possible to obtain a high molecular weight poly(HFPO) (
14800) using the anionic initiator in conditions of stabilized reaction temperature, and optimized addition of solvent and monomer feeding (HFP/initiator mole ratio=31.5 and HFPO feeding rate=11.67 g/hr). Otherwise, chain transfer reaction in anionic polymerization was increased. From the results of molecular weight in various reaction conditions, it was found that chain propagation and chain transfer in anionic polymerization of HFPO were very sensitive to reaction conditions.
Characterization of Lactide/Hyaluronic Acid Polymer Cross-Linked by 1,3-Butadiene Diepoxide
Han, Gwang-Seon ; Bae, Jung-Eun ; Kim, In-Seop ; Cheong, Seong-Ihl ;
Polymer Korea, volume 32, issue 4, 2008, Pages 390~396
The hyaluronic acid (HA) polymers cross-linked with lactide (LA) using the crosslinking agent, 1,3-butadiene diepoxide (BD), were prepared in order to develop a biomedical material for tissue engineering. The degree of lactide and BD reaction of the crosslinked polymer was determined by the analysis of nuclear magnetic resonance spectroscopy. Both degree of reaction and swelling ratio increased with BD concentration or LA/HA mole ratio. Tensile modulus decreased with increasing BD concentration or decreasing LA/HA mole ratio. Degradation was shown to be progressed at two different stages and became slow with increasing BD concentration. It was shown that the first stage degradation was mainly due to the decomposition of ester linkage in the crosslinked structure. The cell growth inhibition increased with BD concentration. Although cytotoxicity was slightly observed in the high BD concentration, the value was very low (below 6%) enough not to affect the cell growth.
Synthesis and Surface Characteristics of Novel Oligomeric Silane with Perfluoropolyether
Park, Eun-Young ; Lee, Sang-Goo ; Ha, Jong-Wook ; Park, In-Jun ; Lee, Soo-Bok ; Lee, Yong-Taek ;
Polymer Korea, volume 32, issue 4, 2008, Pages 397~402
Perfluoropolyether(PFPE) has been widely applied in industry because of its very excellent properties of very high contact angle and low surface energy, good lubricant property and antifouling property. But the difficulty to synthesize PFPE has limited the research on this field. In this study, the novel silicon-containing oligomer with perfluoropolyether moiety was synthesized, and the structure was characterized by
-NMR. The surface properties of contact angle, sliding angle, and soil release property were investigated. The results show that PFPE in this study can be utilized as an anti-smudge coating material because it shows lower sliding angle and better soil release property than commercial products.