Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal Basic Information
Journal DOI :
The Polymer Society of Korea
Editor in Chief :
Volume & Issues
Volume 33, Issue 6 - Nov 2009
Volume 33, Issue 5 - Sep 2009
Volume 33, Issue 4 - Jul 2009
Volume 33, Issue 3 - May 2009
Volume 33, Issue 2 - Mar 2009
Volume 33, Issue 1 - Jan 2009
Selecting the target year
Performance Characteristics of p-i-n Type Organic Thin-film Photovoltaic Cell with CuPc:
-TCNQ Hole Transport Layer
Park, So-Hyun ; Kang, Hak-Su ; Senthilkumar, Natarajan ; Park, Dae-Won ; Choe, Young-Son ;
Polymer Korea, volume 33, issue 3, 2009, Pages 191~197
We have investigated the effect of strong p-type organic semiconductor
-TCNQ-doped CuPc hole transport layer on the performance of p-i-n type bulk heterojunction photovoltaic device with ITO/PEDOT:PSS/CuPc:
-TCNQ(5 wt%)/CuPc:C60(blending ratio l:l)/C60/BCP/LiF/Al, architecture fabricated via vacuum deposition process, and have evaluated the J-V characteristics, short-circuit current (
), open-circuit voltage(
), fill factor(FF), and power conversion efficiency(
) of the device. By doping
-TCNQ into CuPc hole transport layer, increased absorption intensity in absorption spectra, uniform dispersion of organic molecules in the layer, surface uniformity of the layer, and enhanced injection currents improved the current photovoltaic device with power conversion efficiency(
) of 0.16%, which is still low value compared to silicone solar cell indicating that many efforts should be made to improve organic photovoltaic devices.
Synthesis and Biodegradation Behavior of Poly(ethylene terephthalate) Oligomers
Lee, Chan-Woo ; Chung, Jin-Do ;
Polymer Korea, volume 33, issue 3, 2009, Pages 198~202
Oligo(ethylene terephthalate)(OET), oligo(ethylene succinate-co-terephthalate)(OEST) and oligo(butylene succinate-co-terephthalate)(OBST), which are part of the poly(ethylene terephthalate)(PET) oligomer, were synthesized. Degradation test of oligomers carried out by the presence of lipase PS. There were two objectives in the experiment: first, to measure the weight remaining of the PET oligomer as increasing degradation time, and second to examine the degradation mechanism by analyzing the resulting degraded product. In the synthesis of OEST and OBST, by controlling the feed ratio of both OEST and OBST, we were able to obtain oligomer of different composition ratios. The various composition ratios resulted in oligomer of vastly different thermal properties. We observed that both OEST and OBST were degraded using lipase PS, but as the composition of terephthalic acid was increased, the lipase PS became less effective. We confirmed that the lipase PS easily decomposed polyester of the aliphatic compound.
Preparation of the Conducting Polyaniline-HIPS Blends for Injection Molding by Toluene Solution Casting
Lee, Jong-Hyeok ; Kim, Eun-Ok ;
Polymer Korea, volume 33, issue 3, 2009, Pages 203~206
Polyaniline Emeraldine salt (PANI-salt) prepared by the common chemical oxidative polymerization caused the corrosion of the metallic injection mold by protonic acid such as HCl which used as a dopant. PANI-salt, polyaniline doped with dodecylbenzenesulfonic acid (DBSA), was obtained by the emulsion polymerization in nonpolar organic solvent, toluene. In this study DBSA was used as a dopant along with a surfactant. PANI-salt and high impact polystyrene (HIPS) have a good solubility in toluene. Blends with different ratio of PANI and HIPS were prepared through a solution-cast blending. The structure of PANI-salt was characterized by FT-IR and UV-Vis. The morphology, thermal, and electrical properties for PANI-HIPS blends were investigated. Injection molded under
, 120 psi, PANI-HIPS showed the highest electrical conductivity (
) after blending PANI (50 mL) and HIPS (1 g).
Synthesis and Photoalignment of Soluble Polyimides with Styrylpyridine Side Groups
Kim, Jin-Woo ; Kim, Min-Woo ; Ahn, Deuk-Kyoon ; Kim, Woo-Sik ;
Polymer Korea, volume 33, issue 3, 2009, Pages 207~212
The precursor polyimide of the photoreactive polyimides(PI-SP6 and PI-SP12) was prepared from a derivative of 2, 2, 2-trifluoroethane dianhydride and 3,3'-dihydroxy-4,4'-diaminobiphenyl. PI-SP6 and PI-SP12 were then prepared by the polymer reactions of the precursor polyimide with photoreactive 2-styrylpyridine alkylene (hexylene and dodecylene) derivatives, respectively. The photoreactive polymers were soluble in organic solvents. The polymers showed the initial decomposition temperatures around
. The glass transition temperatures of PI-SP6 and PI-SP12 were found to be
, respectively. This result means that the latter polymer is more flexible than the former polymer. Their transmittance in the film state was 90% at
, which indicates that the photosensitive polyimides with thermal stability have high optical transparency even at the high temperature. The respective dichroic ratios of PI-SP6 and PI-SP12 were found to be 0.01 and 0.03 at an exposure energy of
. This result suggests that the latter polymer with larger flexibility compared to the former polymer is more effective for the photoalignment.
Targeted Gene Delivery of the Cationic Lipid Emulsion System Containing Folate-PEG-DPPE
Kwon, Sang-Kyoo ; Jeong, Kwan-Ho ; Kim, Young-Jin ;
Polymer Korea, volume 33, issue 3, 2009, Pages 213~218
A cationic lipid emulsion containing 1,2-dioleoyl-3-trimethylammonium-propane(DOTAP), Tween80, squalene has been prepared as a gene delivery system. In order to increase the transfection efficiency of gene carrier, folate was used as the tumor-targeting ligand that was attached on PEG-DPPE. HeLa and 293 cells were used for the in vitro transfection experiment. HeLa cell is a folate-positive cell line. The mean particle sizes of polymeric lipid system and DNA/lipid complex system were 206.6 nm and 150.5 nm, respectively. The transfection efficiencies of our carriers(4:l(w:w) complex ratio)were 100 times higher than that of DOTAP only emulsion due to the targeting effect of folate.
Drug Delivery System Using Electrospun Nanofiber Mats
Yoon, Hyeon ; Park, Yoon-Kyung ; Kim, Geun-Hyung ;
Polymer Korea, volume 33, issue 3, 2009, Pages 219~223
The nanofibers fabricated by using an electrohydrodynamic process has been used as various applications, such as nano-device, filtering system, protective clothes, wound dressing, and drug delivery system (DDS). Of these applications, the DDS should be needed to minimize side effects of drugs, maximize the properties of medicine, and efficiently deliver the required amount of drugs to the diseased area. In this paper, by using the electro spinning process, which is one of electrohydrodynamic processes, two different types, polycarprolactone and poly(ethylene oxide)/Rhodamine B, of electrospun mats were fabricated layer by layer and the release behavior of Rhodamine B was characterized with time. In addition, to show the feasibility of DDS of this type, we tested release behavior of a peptide of the nanofiber system, a PCL/(Peptide+PEO)/PCL nanofiber mat. The released peptide did not loss biological activities. From these results, we believe that the layered nanofiber mat as a DDS has enough function of a new drug delivery system.
Dielectric Properties of Semi-IPN Poly(phenylene oxide) Blend/
Composites with Type of Cross-linker
Jang, Yong-Kyun ; Lee, Ho-Il ; Seong, Won-Mo ; Park, Sang-Hoon ; Yoon, Ho-Gyu ;
Polymer Korea, volume 33, issue 3, 2009, Pages 224~229
The dielectric properties of semi-IPN poly(phenylene oxide)(PPO) blend/
(BT) composites are investigated. The composites are fabricated via melt-mixing of crosslinker and peroxide in precursor PPO composite obtained by precipitating the suspension consisted of PPO, BT and toluene into methylethyl ketone, poor solvent of PPO. The permittivity of the precursor PPO composites shows higher value than that of integral-blended PPO composites by extruder and coincides with the theoretical value calculated by logarithmic rule of mixture. The blend of PPO and cross-linked triallyl isocyanurate is most effective for lowering the permittivity and loss tangent owing to the suppression of the orientation polarization of matrix. In contrast, 4,4'-(1,3-phenylene diisopropylidene) bisaniline, which has amine unit in its structure, increases the permittivity as well as loss tangent of the composite, but it has the ability to densify the matrix resin and the interfacial adhesion between the matrix and filler to improves flexural strength and modulus.
Isothermal Drying Rate and Copolymerization of Vinyl Acetate/Alkyl Methacrylates
Kim, Min-Sung ; Seul, Soo-Duk ;
Polymer Korea, volume 33, issue 3, 2009, Pages 230~236
Water soluble vinyl acetate/alkyl methacrylate copolymers were prepared by the emulsion copolymerization of vinyl acetate and various methacrylates such as methyl methacrylate (MMA) and ethyl methacrylate (EMA). Potassium persulfate (KPS) and ammonium persulfate (APS) were used as an initiator. Poly (vinyl alcohol) (PVA) was used as a protective colloid. The drying characteristics of the prepared poly(vinyl acetate-co-methyl methacrylate) (PVAc/PMMA), poly(vinyl acetate-co-ethyl methacrylate) (PVAc/PEMA) were studied using moisture meter at the temperature between 100 and
. The significant results are described as follows. The activation energy of the isothermal drying process of the copolymers has the order of PVAc/PMMA> PVAc/PEMA> PVAc.
Iontophoretic Transdermal Delivery of Alendronate in Hairless Mouse Skin
Jyoung, Jy-Young ; Shim, Bae-Sun ; Hwang, In-Sik ; Cho, Dong-Eon ;
Polymer Korea, volume 33, issue 3, 2009, Pages 237~242
This study examined the transdermal delivery of alendronate across hairless mouse skin. The effects of iontophoresis, perforation with a microneedle, and a combination of a microneedle pretreatment and iontophoresis were evaluated in vitro test. Hydrogel patches were polymerized by UN polymerization to supply a hydrogel patch to the iontophoretic transdermal drug delivery system. The alendronate content in the iontophoretic delivery patch was
. The amounts of alendronate that permeated across the hairless mouse skin when current densities of 0.25 and
were supplied to the iontophoretic alendronate patch were
, respectively. After pretreatment with a microneedle, the amounts of alendronate that permeated across the hairless mouse skin increased to
, respectively. The biocompatibility of the iontophoretic alendronate patch was examined according to the international standardization organization 10993.
Effect of Zeolite Filler on the Thermal and Mechanical Properties of Cellulose Diacetate
Lee, Chang-Kyu ; Cho, Mi-Suk ; Kim, In-Hoi ; Nam, Jae-Do ; Lee, Young-Kwan ;
Polymer Korea, volume 33, issue 3, 2009, Pages 243~247
Cellulose diacetate (CDA) was plasticized with triacetine (TA) and epoxidized soybean oil (ESO) in a high speed mixer. Composites of plasticized CDA and zeolite were prepared by a melting process. The
of the plasticized CDA was confirmed by DMA analysis. The
value of the CDA with 50% zeolite was
. As the content of zeolite was increased from 10 to 50% the modulus of the composite was increased from 1.7to 3.6 GPa by two times over the plasticized CDA, and its tensile strength was increased to 62 MPa and then decreased down 51 MPa, and its elongation was increased to 10% and then decreased down 3.2%. In the SEM image, the compatibility between CDA and zeolite was observed. Increasing the amount of zeolite in the composites resulted in further enhancement of the
Effect of Graft Copolymer Composition on the Compatibility of Biodegradable PCL/PCL-g-PEG Blend
Cho, Kuk-Young ; Lee, Ki-Seok ; Park, Jung-Ki ;
Polymer Korea, volume 33, issue 3, 2009, Pages 248~253
Blend films based on the poly(
-caprolactone) (PCL) and amphiphilic biodegradable polymer, poly(ethylene glycol) grafted poly(
-caprolactone) (PCL-g- PEG), were prepared with different blend ratios in order to develop new biomedical material. PCL was the main component in the blend. The miscibility and characteristics of the blends were investigated. The crystallization temperature of the blend shifted to high temperatures with an increase of the graft copolymer contents when the homopolymer PCL was the main component of the blend. The PEG side chain in the blend affected the crystallization rate of the PCL crystals in the blend and alternating extinction bands were observed by optical microscopy. The protein adhesion behavior of the film was influenced by the water uptake of the film.
Thermal and Cholesteric Mesophase Properties of Hydroxypropyl Celluloses and (Butoxypropyl)celluloses
Jeong, Seung-Yong ; Ma, Yung-Dae ;
Polymer Korea, volume 33, issue 3, 2009, Pages 254~262
Nine kinds of hydroxypropyl celluloses (HPCs) with degree of substitution (DS) and molar substitution (MS) ranging from 2.10 to 2.71 and 2.3 to 6.7, respectively and seven kinds of fully butanoated HPCs (BPCs) based on the HPCs with
were synthesized, and the molecular characteristics of HPCs and the thermotropic liquid crystalline properties of the derivatives were investigated. MS was nearly equal to DS for small value of DS, but it became exceedly larger than DS for
, showing that in the later stages of reaction, propylene oxide preferentially adds to the side chains rather than the main chain. All the derivatives formed enantiotropic cholesteric phases with right-handed helical structures. The glass and clearing transition temperatures of both HPCs and BPCs were decreased with increasing MS. The optical pitches (
) of BPCs, as well as HPCs themselves, increased with increasing temperature. However, the
of both HPCs and BPCs at the same temperature increased with increasing MS. Moreover, the temperature dependence of
of HPCs was weaker than that of BPCs, suggesting that the helical twisting power of the cellulose chain highly depends on the length and chemical structure of the side chain introduced in cellulose chain.
Surface Characterization of the d-PMMA Thin Films Treated by Oxygen Plasma
Kim, Soong-Hoon ; Choi, Dong-Jin ; Lee, Jeong-Su ; Choi, Ho-Suk ;
Polymer Korea, volume 33, issue 3, 2009, Pages 263~267
In order to improve the hydrophilic property on the surface of d-PMMA(deuterated poly-(methyl methacrylate)) film, it was exposed to oxygen plasma, All experimental conditions were same except to plasma exposure time that was varied from 0 to 180 s, The effects according to the exposure time were identified using contact angles, X-ray reflectometer(XRR), neutron reflectometer(NR), and X-ray photoelectron spectroscopy(XPS). By confirming that as the exposure time increases, water contact angle decreases while the composition of oxygen increases, it was confirmed that the composition of oxygen has a huge influence on improving the hydrophilic property. The physical characters as a function of the exposure time were investigated by the XRR. By analyzing complementally the results of the XRR, NR, and XPS, more detailed chemical bonding conditions were studied by obtaining not only composition of the carbon and oxygen but that of the hydrogen.
A Study on the Graft Distribution of the FEP-g-PSSA Membranes Prepared by a Simultaneous Irradiation Method
Ko, Beom-Seok ; Shin, Jun-Hwa ; Sohn, Joon-Yong ; Nho, Young-Chang ; Kang, Phil-Hyun ;
Polymer Korea, volume 33, issue 3, 2009, Pages 268~271
In this study, the distribution behaviors of the polystyrene sulfonic acid (PSSA) grafting polymer across the FEP-g-PSSA membranes prepared by a simultaneous irradiation method, were investigated by analyzing the cross-section of the membranes with a SEM-EDX instrument. The effects of irradiation conditions such as the degree of grafting, FEP film thickness, and grafting solvent on the distribution of the grafting polymer were mainly studied in this experiment. The results indicate that to obtain the evenly grafted FEP-g-PSSA membranes, the higher degree of grafting is required as the film thickness increases, and the lower dose rate are more effective than the higher dose rate at the given dose.