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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 31, Issue 6 - Nov 2007
Volume 31, Issue 5 - Sep 2007
Volume 31, Issue 4 - Jul 2007
Volume 31, Issue 3 - May 2007
Volume 31, Issue 2 - Mar 2007
Volume 31, Issue 1 - Jan 2007
Selecting the target year
The Effect of Chemical Properties of Comonomer on Adhesion Properties of Acrylic Pressure Sensitive Adhesives
Choi, Woon-Jin ; Kim, Ho-Gyum ; Cho, Kwang-Soo ; Lee, Dong-Ho ; Min, Kyung-Eun ;
Polymer Korea, volume 31, issue 5, 2007, Pages 369~373
In this study, solvent-free pressure sensitive adhesives (PSA) using acrylic copolymer was prepared by UV radiation to investigate the effect of comonomer on the adhesion properties. Adhesive force value of PSA was increased with the amount of comonomer having shorter side chain due to the enhanced intrinsic surface energy. Peel and shear strength were also influenced by chemical properties of comonomer. The addition of comonomer, ethyl and n-butyl acrylate allows PSA sample with high peel and shear strength. This nay be explained in terms of correlation between loss modulus and glass transition temperature of PSA. As the addition of acrylic comonomers with long side chain length decreases the loss modulus of PSA, the deformation of PSA can not be inhibited.
Preparation and Properties of Water-Soluble Photosensitive Polymer with Azido Group
Yoon, Keun-Byoung ; Lee, Joon-Tae ; Han, Jeong-Yeop ; Lee, Dong-Ho ;
Polymer Korea, volume 31, issue 5, 2007, Pages 374~378
Water-soluble terpolymer of acrylamide, diacetone acrylamide, and acrylic acid was prepared by redox initiators in aqueous medium. One component photoresist was synthesized by reaction of terpolymer with 4-azidoaniline. By blending the aqueous acrylamide/diacetone acrylamide copolymer solution with bisazide, 4,4'-diazidostilbene -2,2'-disulfuric acid sodium salt, two component photoresist was prepared. The photosensitivity per azido group unit mole of one component photoresist was 4 times higher than that of two component photoresist. The dot-type pattern was successfully achieved with one component photoresist at low exposure energy, which is prospective to be used as black matrix negative photoresist.
Synthesis of Polyurethane Nanocomposite Filled Inorganic Particles and Their Properties
Son, Bok-Gi ; Hwang, Taek-Sung ;
Polymer Korea, volume 31, issue 5, 2007, Pages 379~384
The nanocomposites with inorganic nano powder, improved thermal stability, were prepared by urethane polymerization. The structure and surface properties of the nanocomposites were determined by X-ray diffraction and FT-IR, respectively. The thermal stabilities were studied using TGA and DSC. Their morphologies and mechanical properties were observed by SEM and UTM. As a result, the nanocomposites with MMT led to the increase of the silicate layers. The distance between layers of the nanacomposites with MMT was increased by
and the new peaks at
were shown in the presence of the Si-O groups on the silica. The thermal stabilities of the nanocomposites were higher than those of pore polyurethane matrix. The nanocomposites had higher in mechanical properties than the pure polyurethane matrix.
Preparation and Crystallization Behavior of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) Grafted with Poly(N-vinylpyrrolidone)
Wang, Wei ; Zhang, Yu ; Chen, Yanmo ;
Polymer Korea, volume 31, issue 5, 2007, Pages 385~392
Poly (N-vinylpyrrolidone) (PVP) groups were grafted onto a poly(3-hydroxybutyrate-co-3-hydroryvalerate) (PHBV) backbone in order to modify its properties and synthesize a novel biocompatible copolymer. The crystallization behavior of PHBV and grafted PHBV was investigated by differential scanning calorimetry (DSC) and polarized optical microscopy (POM). During the cooling-induced crystallization process, the crystallization temperature and the crystallization rate of the grafted PHBV decreased with increasing PVP weight fraction. On the heating scans of all grafted PHBV samples, a new crystallization exothermic peak appeared at almost the same temperature, suggesting the operation of a recrystallization process, while the melting temperature (
) and the apparent enthalpy of fusion (
) were not affected by graft modification. During the isothermal crystallization process at the same temperature, the presence of side PVP groups decreased the spherulitic growth rate and the spherulitic band spacing with increasing PVP weight fraction in samples.
Studies of Liquid Crystal Alignment on the Photosensitive Polyvinylfluorocinnamate
Kim, Dong-Soo ; Ahn, Won-Sool ; Ha, Ki-Ryong ; Buluy, O. ; Reznikov, Yu. ;
Polymer Korea, volume 31, issue 5, 2007, Pages 393~398
We studied the mechanism of liquid crystal alignment on polyvinylfluorocinnamate (PVCN-F) films which were irradiated by UV using polarized fourier transform infrared (FT-IR) spectroscopy and ultraviolet/visible (UV/Vis) spectroscopy. UV irradiation of PVCN-F films caused decrease of vinylene -C=C- stretching peak area at
and shift of conjugated C:0 stretching vibration at
which is caused by nonconjugated C=O stretching nitration. To study the orientation direction of 5CB liquid crystal (LC) molecules in the liquid crystal cell with PUV irradiation, rubbing treatment or without any treatment on the PVCN-F alignment layer, we used polarized FT-IR dichroism technique. We successfully measured 5CB LC alignment directions, which are perpendicular to the irradiated PUV polarization direction and parallel to the rubbing direction in the liquid crystal cell without using dichroic dyes.
Rheological and Failure Properties of Polycarbonate/Poly(butylene terephthalate) Blends
Nah, Chang-Woon ; Huh, Mong-Young ; Choi, Dae-Hwan ; Kook, Jeong-Ho ; Hwang, In-Ra ; Jeong, Kwang-Un ; Hong, Chang-Kook ;
Polymer Korea, volume 31, issue 5, 2007, Pages 399~403
Trans-esterification behavior of polycarbonate/poly(butylene terephthalate) (PC/PBT) blends was investigated during the melt mixing process. Rheological and fracture behaviors, and fracture morphology were also investigated as a function of PC/PBT blend ratio. Based on FT-IR and
results, a trans-esterification reaction was confirmed to occur between PC and PBT during the melt mixing process. The melt index(MI) decreased with increased PC content, indicating the higher flow resistance of PC. The storage and loss moduli were increased by increasing the PC loading, and the PC/PBT blends were rheologically incompatible based on the Cole-Cole plot. The tensile property increased linearly with the increased PC content. However, the impact strength increased until 50 wt% of PC loading, notably around
, and then was levelled off at 50 wt%. Rough ridges were formed on the impact fracture surfaces above the 40 wt% of PC content, supporting the observed higher impact strength in this range.
Fire-Retardation Properties of Polyurethane Nanocomposite by Filling Inorganic Nano Flame Retardant
Son, Bok-Gi ; Hwang, Taek-Sung ; Goo, Dong-Chul ;
Polymer Korea, volume 31, issue 5, 2007, Pages 404~409
Polyurethane nanocomposites with inorganic nano fillers for the improvement thermal stability were prepared by the urethane reaction. Fire retardation properties of polyurethane nanocomposites were investigated by cone calorimeter and limited oxygen index (LOI). Maximum heat release rate of MMT-PU and
polyurethane nanocomposites were decreased as 50% than polyurethane matrix and fire retardation properties of
nanocomposte had the best improvement. The LOI of polyurethane nanocomposites also were improved as filling fillers in the nanocomposites over 20. The maximum heat release rates of MMT-PU,
polyurethane nanocomposites were 764, 707,
, respectively and
polyurethane nanocomposite exhibited the highest value of fire-retardant. We confirmed that polyurethane nanocomposites improved the fire retardation properties.
Study for Mechanical Properties of Electroless (Ni/Au) Plated Monodisperse Polymer Particles
Kim, Dong-Ok ; Jin, Jeong-Hee ; Shon, Won-Il ; Oh, Seok-Heon ;
Polymer Korea, volume 31, issue 5, 2007, Pages 410~416
Monodisperse polymer particles were prepared via one- step seeded polymerization using PMMA as seed particles, and HDDA, triEGDMA or EGDMA as crosslinking monomer. For the study, the effects of 1) the ratio of the absorbed monomer to the seed polymer particles (swelling ratio), 2) the characteristics of crosslinking monomer, 3) electroless Ni plating, and 4) electroless Au Plating on the variation of mechanical properties of polymer particles, such as recovery rate, K-values, breaking strength and breaking displacement were investigated by using MCT (micro compression test). It was observed that swelling ratio of polymer particles influenced only on breaking strength of polymer Particles, while electroless plating did on recovery rate, K-values (
) and breaking strength of electroless plated polymer particles. However, breaking displacement and K-values (
) were more or less insensitive to electroless plating.
Facile Synthesis of Dendritic Benzyl Chlorides from Their Alcohols with Methanesulfonyl Chloride/
Lee, Jae-Wook ; Han, Seung-Choul ; Kim, Hee-Joo ; Kim, Jung-Hwan ; Lee, Un-Yup ; Kim, Byoung-Ki ; Sung, Sae-Reum ; Kang, Hwa-Shin ; Kim, Ji-Hyeon ; Huh, Do-Sung ;
Polymer Korea, volume 31, issue 5, 2007, Pages 417~421
A successful rapid synthesis of dendritic benzyl chlorides from dendritic benzyl alcohols using methanesulfonyl chloride/
as activating agents was described. In this method, each dendritic benzyl chloride can be prepared in one pot: no isolation of intermediate mesylated dendrons is required. The key steps in the syntheses of dendritic benzyl chlorides were the mesylation of the hydroxymethyl group followed by the chlorination by in-situ generated triethylammonium chloride.
Mechanical, Thermal and Electrical Properties of Polymer Nanocomposites Reinforced with Multiwalled Carbon Nanotubes
Kook, Jeong-Ho ; Huh, Mong-Young ; Yang, Hoon ; Shin, Dong-Hoon ; Park, Dae-Hee ; Nah, Chang-Woon ;
Polymer Korea, volume 31, issue 5, 2007, Pages 422~427
Semiconducting layers are thin rubber film between electrical cable wire and insulating polymer layers having a volume resistivity of
. Commercial semiconducting layers ire composed of polymer composites reinforced with more than 30 wt% of carbon blacks. A new semiconducting material was suggested in this study based on the carbon nanotube(CNT)-reinforced polymer nanocomposites. CNT-reinforced polymer nanocomposites were prepared by solution mixing and precipitation with various polymer type and dual filler system. The mechanical, thermal and electrical properties were investigated as a function of polymer type and dual filler system based on CNT and carbon black. The volume resistivity of composites was strongly related with the crystallinity of polymer matrix. With the decreased crystallinity, the volume resistivity decreased linearly until a critical point, and it remained constant with further decreasing the crystallinity. Dual filler system also affected the volume resistivity. The CNT-reinforced nanocomposite showed the lowest volume resistivity. When a small amount of carbon black(CB) was replaced the CNT, the crystallinity increased considerably leading to a higher volume resistivity.
Ultra High Molecular Weight Polyethylene Nanocomposite Films : Thermomechanical Property, Morphology, and Gas Permeability
Jung, Min-Hye ; Kim, Jeong-Cheol ; Chang, Jin-Hae ;
Polymer Korea, volume 31, issue 5, 2007, Pages 428~435
The thermomechanical property, morphology, and gas permeability of nanocomposites of ultra high molecular weight polyethylene (UHMWPE) with two different organoclays are compared. Hexamethylene benzimidazole-mica (
) and Cloisite 25A were used as reinforcing fillers in the formation of UHMWPE hybrid films. Dispersions of organoclays with UHMWPE were carried out by using the solution intercalation method at different organoclay contents to produce nano-scale composites. Transmission electron microscopy (TEM) micrographs show that some of the clay layers are dispersed homogeneously within the polymer matrix on the nano-scale, although some clay particles are agglomerated. We also found that the addition of only a small amount of organoclay is enough to improve the thermomechanical property and gas barrier of the UHMWPE hybrid films. In general, Cloisite 25A is more effective than
in increasing both the thermomechanical property and the gas barrier in a UHMWPE matrix.
Preparation and Characterization of Multiwalled Carbon Nanotubes/Lyocell Composite Fibers
Lu, Jiang ; Zhang, Huihui ; Shao, Huili ; Hu, Xuechao ;
Polymer Korea, volume 31, issue 5, 2007, Pages 436~441
In this work, the multiwalled carbon nanotubes(MWNTs) were functionalized with sodium dodecylbenzene sulfonate(SDBS) and then MWNTs/Lyocell composite fibers were prepared. The properties of MWNTs, the functionlization on the surface of MWNTs and their dispersion in the cellulose matrix were characterized by TEM, SEM, WAXD and FT-IR. The results showed that SDBS has been coated successfully onto the surface of the MWNTs by functionlization. This can improve effectively the dispersion uniformity of MWNTs in NMMO aqueous solution and is helpful to prepare a spinnable spinning dope. Moreover, the resultant MWNTs/Lyocell composite fibers still have cellulose II crystal structure, and their tensile strength and initial modulus increased with the increasing draw ratio and reached the optimal value with adding 1 wt% MWNTs. The thermal stability of the composite fiber was also improved by the addition of the MWNTs.
Synthesis and Properties of Alkali-Soluble and Photosensitive Polyester Derivatives for LCD Color-Filter
Lee, Sang-Hoon ; Jo, Young-Gon ; Kim, Joo-Sung ; Bae, Jin-Young ;
Polymer Korea, volume 31, issue 5, 2007, Pages 442~446
Alkali soluble and photo-curable polyesters were prepared from fluorene epoxy acrylate and various aromatic dianhydrides. To make a black matrix for LCD color-filter application, photo-resist solution was made by mixing synthesized polyester as binder, carbon black as pigment, initiator and multifunctional monomer in solvent. Black matrix pattern was formed on the glass substrate by lithography process. In this study, we synthesized various polyester-based binder polymers for LCD color-filter applications, and compared the analytical properties of those polymers and lithography patterns.
Effect of Recrystallized PLGA on Release Behavior of 5-Fluorouracil
Park, Jung-Soo ; Lee, Joon-Hee ; Choi, Myung-Gyu ; Rhee, John-M. ; Kim, Moon-Suk ; Lee, Hai-Bang ; Khang, Gil-Son ;
Polymer Korea, volume 31, issue 5, 2007, Pages 447~453
In this study, we fabricated recrystallized PLGA (rPLGA) particles using the vacuum drying method. In order to investigate an applicability of the rPLGA particles for controlled release system of 5-fluorouracil (5-FU) loaded PLGA wafer, we prepared three different wafers using; 1) untreated PLGA (uPLGA), 2) rPLGA, and 3) uPLGA and rPLGA (4 : 1, 1 : 1 or 1 : 4). The rPLGA particles were characterized using NMR, IR and GPC to compare with uPLGA particles. The surface and cross section morphology of the prepared wafers were observed by the scanning electron microscope. The release profile of the 5-FU loaded wafer was measured by HPLC. The 5-FU/rPLGA wafer released the incorporated 5-FU in a sustained manner with low initial burst compared to 5-FU/uPLGA. These results showed that the ratio of pure PLGA/recrystallized PLGA can affect the release behaviors.
Characterization and Preparation of Low Molecular Weight Water Soluble Chitosan Nanoparticle Modified with Cell Targeting Ligand for Efficient Gene Delivery
Heo, Sun-Heang ; Jang, Min-Ja ; Kim, Dong-Gon ; Jeong, Young-Il ; Jang, Mi-Kyeong ; Nah, Jae-Woon ;
Polymer Korea, volume 31, issue 5, 2007, Pages 454~459
Gene therapy using low molecular weight water soluble chitosan (LMWSC) as polycationic polymer shows good biocompatibility, but low transfection efficiency. The mechanism of folic acid (FA) uptake in the cells to promote targeting and internalization could improve transfection rates. The objective of this study was to synthesize and characterize the WSCFA-DNA complex and evaluate their cytotoxicity, in vitro. In
spectra, specific peaks appeared both of FA and LMWSC in
. WSCFA nanoparticles have spherical shapes with particle size show below 110 nm. In the cell cytotoxicity test, the WSCFA-DNA complex showed high cell viability, in vitro. Gel electrophoresis showed condensed DNA within the carriers. hi vitro transfection efficiency was assayed by fluorescence spectroscopy WSCFA nanoparticles have less cytotoxicity, good DNA condensation and particle size around 110 nm, which makes them a promising candidate as a non-viral gene vector.