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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 34, Issue 6 - Nov 2010
Volume 34, Issue 5 - Sep 2010
Volume 34, Issue 4 - Jul 2010
Volume 34, Issue 3 - May 2010
Volume 34, Issue 2 - Mar 2010
Volume 34, Issue 1 - Jan 2010
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Fabricating Highly Aligned Electrospun Poly(
-caprolactone) Micro/Nanofibers for Nerve Tissue Regeneration
Yoon, Hyeon ; Lee, Haeng-Nam ; Park, Gil-Moon ; Kim, Geun-Hyung ;
Polymer Korea, volume 34, issue 3, 2010, Pages 185~190
Recently, an electrospinning process, which is one of various nanotechnologies, has been used in fabricating micro/nanosized fibers. The fabricated electrospun micro/nanofibers has been widely applied in biomedical applications, specially in tissue regeneration. In this study, we fabricated highly aligned electrospun biodegradable and biocompatible poly(
-caprolactone)(PCL) micro/nanofibers by using a modified electrospinning process supplemented with a complex electric field. From this process, we can attain highly aligned electrospun nanofibers compared to that fabricated with the normal electrospinning process. To observe the feasibility of the highly aligned electrospun mat as a biomedical scaffold, nerve cells(PC-12) was cultured and it was found that the cells those were well oriented to the direction of aligned fibers.
A Study on the Thermo-mechanical Characteristics and Adhesion Reliability of Anisotropic Conductive Films Depend on the Curing Methods of Epoxy Resins
Gil, Man-Seok ; Seo, Kyoung-Won ; Kim, Jae-Han ; Lee, Jong-Won ; Jang, Eun-Hee ; Jeong, Do-Yeon ; Kim, Su-Ja ; Kim, Jeong-Soo ;
Polymer Korea, volume 34, issue 3, 2010, Pages 191~197
To improve the curing method of anisotropic conductive film (ACF) at low temperature, it was studied to replace the thermal latent curing agent of imidazole compounds by the curing agent of cationically initiating type. Thermo-mechanical properties such as glass transition temperature, storage modulus, and coefficient of thermal expansion were investigated for the analysis of curing behavior. The reliability of ACF were observed in thermal cycle and high temperature-high humidity test. ACF using cationic initiator showed faster curing, lower CTE, and higher
than the case of using imidazole curing agent, which is important for the high temperature stability. Furthermore, ACF using cationic initiator maintained a stable contact resistance in reliability test, although it was cured at low temperature and fast rate. With these results, it was confirmed that the curing method of epoxy had great effect on thermo-mechanical properties and reliability of ACF.
Synthesis of Multi-walled Carbon Nanotube/Poly(ethylene oxide) Hybrids
Hong, Chae-Hwan ; Han, Do-Suk ; Nam, Byeong-Uk ;
Polymer Korea, volume 34, issue 3, 2010, Pages 198~201
We have worked a surface modification to release a strong agglomeration of multi-walled carbon nanotube(MWCNT) and a incorporation of hydrophilic polymer to improve compatibility between MWCNT and polymers. Carboxylated MWCNT was easily obtained by acid treatment and the carboxylate was converted to acylchloride by thionyl chloride. Then, we tried one more synthesizing routes to achieve covalent bonds with poly(ethylene oxide) having amine end groups of low molecular weight. We measured the polymer content on the surface of MWCNT by TGA and observed increased diameter of MWCNT by SEM and TEM analysis.
Synthesis of Crosslinkable m-Aramid Ionomer Containing Sulfonated Ether Sulfone and Their Characterization for PEMFC Membrane
Jung, Hyun-Jin ; Kim, Jung-Min ; Cho, Chang-Gi ;
Polymer Korea, volume 34, issue 3, 2010, Pages 202~209
Aromatic copolyamides were prepared and their applicability to proton exchange membrane wasstudied. The copolymer contains thermally stable and mechanically strong poly(m-phenylene isophthalamide) segments, and easily processable and good film forming polysulfone segments. For the copolymer, amineterminated sulfonated ether sulfone monomer, m-phenylene diamine, and isophthaloyl chloride were reacted, and the obtained copolymer was transformed into crosslinkable prepolymer by the reaction with acryloyl chloride. The prepolymer was thermally cured and converted into proton exchange membranes for fuel cell application. Each reaction step and the molecular characteristics of precursor copolymers were monitored and confirmed by
NMR, FTIR, and titration. The performance of the membranes was measured in terms of water uptake, proton conductivity, and thermal stability. The water uptake, ion exchange capacity (IEC), and proton conductivity of the membranes increased with the increase of sulfonated ether sulfone segment content. Membrane containing 30 mol% sulfonic acid sulfone segment showed 1.57 meq/g IEC value. Water uptake was limited less than 44 wt% and the highest proton conductivity up to
, RH= 100%) was observed.
Structure Development of Solvent Casting Triacetyl Cellulose Film
Kim, Hyo-Gap ; Kim, Hong-Suk ; Kim, Han-Sung ; Cho, Jin-Sik ; Kim, Yong-Won ; Kang, Ho-Jong ;
Polymer Korea, volume 34, issue 3, 2010, Pages 210~214
The structural development of triacetyl cellulose (TAC) was studied as a function of solution casting processing parameters such as dope concentration, evaporation temperature, annealing temperature and the addition of plasticizer. The crystalline structure was developed by the solution casting and the level of crystallinity was increased with increasing dope concentration and evaporation temperature. The crystalline structure could be enhanced by the annealing process after formation of TAC film. Introducing plasticizer resulted in decreasing melting temperature and crytallinity of TAC film due to the increase of chain mobility. It was also found that thermal stability of TAC was improved due to the rigid structure of applied plasticizer.
Preparation and Mechanical Properties of NBR/Clay Nanocomposite
Li, Dun ; Park, Se-Hyeong ; Sur, Gil-Soo ;
Polymer Korea, volume 34, issue 3, 2010, Pages 215~219
Nitrile rubber (NBR) composites were prepared using the commercially avaliable rubber compounding process with Cloisite
10A or carbon black as fillers. When Cloisite
10A was used as a filler in the NBR composites, the mechanical properties, oil resistant, and oxygen barrier were better than those for carbon black composites. In cure characteristics of NBR/clay composites, scorch time and curing time were reduced. It was found that alkyl ammonium ion inserted in Cloisite
10A was considered as an accelerator of vulcanization for NBR composites.
Effect of Chain Orientation on the Optical Properties and Dimensional Stability of Polyethersulfone Film
Kim, Jae-Hyun ; Kim, In-Sun ; Kim, Yang-Kook ; Kang, Ho-Jong ;
Polymer Korea, volume 34, issue 3, 2010, Pages 220~225
The optical properties and dimensional stability of polyethersulfone(PES) retardation film have been studied as function of chain orientation and the temperature applied to PES retardation film. It was confirmed that the appropriate retardation values of
for the retardation film application were able to obtain by the chain orientation and these values could be controlled by the chain relaxation through the thermal annealing process. It was found that unstable
values were shown by the repeated cooling and heating applied to the retardation films but this could be stabilized by means of the annealing process after stretching of PES film. The dimensional shrinkage due to the chain orientation was found as temperature increase and the intrinsic thermal expansion of PES appeared after shrinking. The shrinkage of PES films affected by the chain orientation and thermal annealing dramatically but the effect on the coefficient of thermal expansion was found to be negligible.
The Effect of Chemical Structure on the Adhesion Properties of Acrylic Pressure Sensitive Adhesives Prepared by Multifunctional Monomers
Cho, In-Mok ; Kim, Ho-Gyum ; Han, Dong-Hee ; Lim, Jeong-Cheol ; Min, Kyung-Eun ;
Polymer Korea, volume 34, issue 3, 2010, Pages 226~236
UV irradiated acrylic pressure sensitive adhesives(PSAs) are prepared to be used for thermal pad in plasma display panel(PDP). The effect of the chemical structure of side-chain in comonomer and of crosslinking agent on wet-out property of acrylic PSAs in wide temperature range were investigated. The correlationship between viscoelastic behavior and adhesion properties, such as tack and peel strength, was also studied. The experimental results supported that wet-out and adhesion properties of acrylic PSAs were enhanced inversely proportional to side-chain length of comonomer in wide temperature range. The peel energy clearly increased in acrylic PSAs prepared by using di(ethylene glycol) dimethylacrylate (DEGDMA) for crosslinking agent. The results might be due to the difference in the glass transition temperature and viscoelastic behavior of acrylic PSAs.
Chemical Resistance of Polycarbonate/Poly(butylene terephthalate) Blends
Lyu, Min-Young ; Choi, Dae-Hwan ; Kim, Young-Hee ; Nah, Chang-Woon ;
Polymer Korea, volume 34, issue 3, 2010, Pages 237~241
Mechanical characteristics and chemical resistance have been investigated for PC/PBT blends. The changes in mechanical performance of PC/PBT blends was monitored during the treatment with both the PC thinner and general-purpose thinner to figure out the chemical resistance. The PC thinner greatly affected the mechanical properties of PC/PBT blends compared with general-purpose thinner. In the case of PC thinner treatment, the mechanical performance was improved with increased PC content at lower PC content ranges, say below 50%. However the mechanical performance was dropped rapidly at higher PC content ranges due to poor chemical resistance of PC. Transparent pure PC specimen became opaque after chemical treatment with PC thinner, and this can be interpreted by solvent-induced crystallization.
Study on Planar Orientation and Selective Reflection of Cholesteric Liquid Crystals
Jung, Gap-Ha ; Seo, In-Seon ; Lee, Mong-Ryong ; Choi, Suk-Won ; Song, Ki-Gook ;
Polymer Korea, volume 34, issue 3, 2010, Pages 242~246
FTIR spectroscopy has been employed in order to quantitatively investigate the relationship between planar arrangements and selective reflectance of cholesteric liquid crystals. It was found that the selective reflection was enhanced as the amount of planar arrangements in cholesteric liquid crystals increased. Although the planar arrangements of cholesteric liquid crystals can be induced only by the shear force effect, it was more effective to use the alignment layer to obtain the perfect planar arrangements.
Tensile Strength and Tensile Adhesive Strengths of Polymer-Modified Mortar with Methyl Methacrylate-Based Latexes
Hyung, Won-Gil ; Lee, Chan-Tae ; Park, Sung-Moo ;
Polymer Korea, volume 34, issue 3, 2010, Pages 247~252
This paper investigates the effects of the monomer ratios on the typical properties of polymer-modified mortars that contain methyl methacrylate-based latexes. Basic data are also obtained to develop appropriate latexes for cement modifiers. Polymer-modified mortars that contain methyl methacrylate latexes copolymerized with butyl acrylate or ethyl acrylate are prepared for different polymer-cement ratios. They are then tested to obtain the tensile and tensile adhesive strengthes of polymer-modified mortar with methyl methacrylate-based latexes. From the test results, the tensile strength of MB7 polymer-modified mortar was higher than normal cement mortar by a maximum of 94% with a 20% polymer-cement ratio, which was almost twice higher than normal. The tensile adhesive strength of the MB polymer-modified mortar was higher for higher MMA monomer contents and polymer-cement ratios, and increased up to four times than that of normal cement mortar. The basic properties of the polymer-modified mortars are more affected by the polymer-cement ratio than by the monomer ratio, and are improved over unmodified mortar.
Preparation and Characterization of Biodegradable Hydrogels for Tissue Expander Application
Yuk, Kun-Young ; Kim, Ye-Tae ; Im, Su-Jin ; Garner, John ; Fu, Yourong ; Park, Ki-Nam ; Park, Jeong-Sook ; Huh, Kang-Moo ;
Polymer Korea, volume 34, issue 3, 2010, Pages 253~260
In this study, we prepared and evaluated a series of biocompatible and biodegradable block copolymer hydrogels with a delayed swelling property for tissue expander application. The hydrogels were synthesized via a radical crosslinking reaction of poly(ethylene glycol) (PEG) diacrylate and poly(D,L-lactide-co-glycolide)-poly(ethylene glycol)-poly(D,L-lactide-co-glycolide)(PLGA-PEG-PLGA) triblock copolymer diacrylate as a swelling/degradation controller (SDC). For the synthesis of various SDCs that can lead to different degradation and swelling properties, various PLGA-PEG-PLGA triblock copolymers with different LA/GA ratios and different PLGA block lengths were synthesized and modified to have terminal acrylate groups. The resultant hydrogels were flexible and elastic even in the dry state. The in vitro degradation tests showed that the delayed swelling properties of the hydrogels could be modulated by varying the chemical composition of the biodegradable crosslinker (SDC) and the block ratio of SDC/PEG. The histopathologic observation after implantation of hydrogels in mice was performed and evaluated by macrography and microscopy. Any significant inflammation or necrosis was not observed in the implanted tissues. Due to their biocompatibility, elasticity, sufficient swelling pressure, delayed swelling and controllable degradability, the hydrogels could be useful for tissue expansion and other biomedical applications.
Shape-Stabilized Phase Change Materials: Preparation and Properties of Frozen Gels from Polypropylene and n-Eicosane for Latent Heat Storage
Son, Tae-Won ; Lim, Hak-Sang ; Kim, Tae-Hun ; Ko, Jae-Wang ;
Polymer Korea, volume 34, issue 3, 2010, Pages 261~268
Phase change materials based on polypropylene blended with n-eicosane were studied in this paper. In addition, this paper reviews recent studies on the preparation of shape stabilized phase change materials (SSPCM), such as SSPCM from polypropylenes and n-eicosane, their basic properties and possible applications to latent heat storage. The preparation methods used were the melting method and absorption methods. Shape stabilized PCM(SSPCM) prepared for DSC, WAXD, FTIR spectroscopy, ARES, results of the analysis of shape stability heat capacity to improve were identified.
Effect of the Viscosity of (Hydroxypropyl)methyl Cellulose on Dissolution Rate of Alfuzosin-HCl Granule Tablet
Kim, Won ; Song, Byung-Joo ; Kim, Dae-Sung ; Kim, Su-Jin ; Lee, Seon-Kyoung ; Kim, Hye-Lin ; Lee, Dong-Won ; Khang, Gil-Son ;
Polymer Korea, volume 34, issue 3, 2010, Pages 269~273
The primary objective of this work is to find the optimal condition for the granule tablet formulation of alfuzosin-HCl that aims to achieve a sustained drug release. (Hydroxypropyl)methyl cellulose (HPMC) is one of the most widely used polymer as a drug formulation and therefore has been utilized in this study as an excipient. Alfuzosin-HCl granule tablet was developed using the various viscosities of HPMC and the effects of viscosity on drug release was investigated. Fourier transform-infrared (FTIR) and X-ray diffraction (XRD) were employed to investigate the chemical structure and crystallization of alfuzosin-HCl in the formulation. We prepared the granule tablet by a direct compression method and studied the release profile in the stimulated intestinal fluid (pH 6.8). As the viscosity of HPMC increased the release of alfuzosin-HCl decreased, demonstrating that controlled release of alfuzosin-HCl can be achieved by varying the viscosity of HPMC.
Preparation and Characterization of PEG-PLA(PLGA) Micelles for Solubilization of Rosiglitazone
Kim, Yon-Hwan ; Im, Jeong-Hyuk ; Min, Hyun-Su ; Kim, Jun-Ki ; Lee, Yong-Kyu ; Park, Go-Eun ; Cho, Kwang-Jae ; Huh, Kang-Moo ;
Polymer Korea, volume 34, issue 3, 2010, Pages 274~281
In this study, PEG-PLA(or PLGA) amphiphilic di-block copolymers were synthesized by ring opening polymerization of D,L-lactide(or glycolide) and applied to polymeric micelle system for solubilization of a rosiglitazone as diabetes drug. The drug could be efficiently loaded into the polymer micelle by solid dispersion technique, and the drug-loaded micelles were characterized and evaluated as a drug delivery carrier by fluorescence spectrometer, DSC, and DLS measurements. The colloidal stability of drug loaded micelles in aqueous media could be enhanced by addition of 2-hydroxy-N-picolylnitinamide as a hydrotropic agent. The polymer micelles also showed biocompatible and nontoxic properties in vitro cell viability using MTT assay, and the drug loaded micelles were observed to be more effective than free drug for decreasing glucose in blood of rats.
Biodisc Regeneration Using Annulus Fibrosus Cell with Hyaluronic Acid Impregnated Small Intestinal Submucosa Sponge
Hong, Hee-Kyung ; Lee, Seon-Kyoung ; Song, Yi-Seul ; Kim, Dae-Sung ; Eom, Shin ; Kim, Hyoung-Eun ; Lee, Dong-Won ; Khang, Gil-Son ;
Polymer Korea, volume 34, issue 3, 2010, Pages 282~288
The porcine small intestinal submucosa (SIS) has been widely used as a biomaterial without immuno rejection responses and hyalunonic acid (HA) can be used as biocompatible materials to regenerate tissue. We developed the SIS sponge and HA loaded SIS sponges (SIS/HA) for the possibility of the application of the tissue engineering using annulus fibrosus (AF). SEM observation shows that SIS and SIS/HA sponges have interconnected and open pores. We demonstrated the presence of HA in SIS/HA sponge from C-O functional group observed by the FTIR analysis. In conclusion, we suggest that SIS/HA sponge may be useful to tissue engineering using AF cell. This may be due to the enhanced biocompatibility and higher water retention capacity of HA.