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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
Flame Retardants Containing Cyclophosphazene Ring for ABS
Shin, Young-Jae ; Shin, Youn-Rok ; Park, Soo-Jin ; Shin, Jae-Sup ;
Polymer Korea, volume 31, issue 4, 2007, Pages 273~277
Cyclophosphazene derivatives were synthesized in order to use as a non-halogen flame retardant for ABS. Chlorocyclophosphazene was reacted with phenol, catechol, aniline, 1,2-diaminobenzene respectively, and each product was characterized by UL94 and LOI test for ABS resin. The physical properties of the sample containing these flame retardants were also characterized. The derivative synthesized from catechol showed best flame retardancy, and the derivative from phenol exhibited the flame retardancy in which the synergic effect was shown with novolac.
Degradation Characteristics of Perfluoropolyether Lubricant for Computer Hard Disk
Lee, Ji-Hye ; Chun, Sang-Wook ; Kang, Ho-Jong ;
Polymer Korea, volume 31, issue 4, 2007, Pages 278~282
The degradation characteristics of perfluoropolyether (PFPE) for computer hard disk drive have been investigated. Thermal degradation in PFPE started at
and it was completed at
. If PFPE was contacted with wear fragment from slider made by
, the thermal degradation was accelerated by the catalytic Lewis acid degradation. The Lewis acid degradation mainly took placed in methylene oride(fluoride) chain scission as well as methylene(fluoride) and hydroxy end chain. As a result, the degradation reaction accomplished as early as at
. The photo oxidation due to UV exposure on PFPE caused the chain scission in methylene(fluoride), and end chain in PFPE without chain scission in methylene oxide(fluoride) and then the molecular weight of PFPE increased by expected secondary reactions between formed radicals in the photo oxidation.
Rheological, Mechanical and Morphological Properties of Poly(acrylonitrile-butadiene-styrene)/Polycarbonate Blends with ABS-g-MAH
Song, Ki-Heon ; Hong, John-Hee ; Sung, Yu-Taek ; Kim, Youn-Hee ; Han, Mi-Sun ; Yoon, Ho-Gyu ; Kim, Woo-Nyon ;
Polymer Korea, volume 31, issue 4, 2007, Pages 283~288
Polymer blends containing poly(acrylonitrile-butadiene-styrene) (ABS) and polycarbonate(PC) (70/30, wt%) with compatibilizer were prepared using twin screw extruder. Compatibilizers were prepared by reactive extrusion with the ABS, maleic anhydride(MAH) and dicumyl peroxide(DCP) using twin screw extruder In the ABS/PC (70/30) blends, tensile strength did not change significantly, but increased from 52.25 to 55.03 MPa when the ABS-g-MAH was added in the amount of 5 phr. From the results of rheological properties, storage modulus of the ABS/PC/ABS-g-MAH blends at low frequencies showed lager value than that of the ABS/PC(70/30) blend. From the results of the morphological properties of the ABS/PC(70/30) blend, it was observed that the drop size of the PC ranged from 1.2 to
and did not change significantly with the addition of the ABS-g-MAH(
). From the results of the storage modulus, complex viscosity, and tensile strength of the ABS/PC (70/30) blends, it is found that the ABS-g-MAH is an effective compatibilizer in the ABS/PC (70/30) blends when the ABS-g-MAH is added in the amount of 5 phr.
Microstructure-Sound Absorption Relationships of Polyurethane Foam and Application of Low Monos Polyol
Lee, Boo-Youn ; Kim, So-Yeon ; Lee, Kwang-Hee ; Jin, Byung-Suk ;
Polymer Korea, volume 31, issue 4, 2007, Pages 289~296
The material factors influencing the sound absorption of the polyurethane foam were investigated with FT-IR, small-angle X-ray scattering (SAXS), and dynamic mechanical thermal analyzer (DMTA). The measurements were performed using the samples which had a similar cell structure but different absorption coefficients. It was found that the ability of the sound absorption of the polyurethane foams was closely related to the damping behavior over the transition range. In order to confirm the use of the low monol polyol (LMP) in high-performance applications, the polyurethanes based on LMP and polypropylene oxide polyol (PPG) were prepared by the solution polymerization method. The microstructure and the physical properties of these polyurethanes were compared. The PPG-based polyurethane showed a higher level of the phase-separated structure because the considerable amount of monol presented in PPG made a contribution to the increased chain mobility. However the short chains formed due to the monol species deteriorated the damping property. As a result, the LMP-based polyurethane showed the superior damping behavior as compared with the PPG-based one.
Preparation and Electrochemical Properties of Polymeric Composite Electrolytes Containing Organic Clay Materials
Kim, Seok ; Hwang, Eun-Ju ; Lee, Jea-Rock ; Kim, Hyung-Il ; Park, Soo-Jin ;
Polymer Korea, volume 31, issue 4, 2007, Pages 297~301
In this work, polymer/(layered silicate) nanocomposites (PLSN) based on poly (ethylene oxide) (PEO), ethylene carbonate (EC) as a plasticizer, lithium salt (
), and sodium montmorillonite (
) or organic montmorillonite (organic MMT) clay were fabricated. And the effects of organic MMT on the polymer matrix were investigated as a function of ionic conductivity. For the application to electrolytes an Li batteries, polymer electrolytes containing the organic nanoclays were used in this work. As a result, the spacing between layers and hydrophobicity of the organic nanoclays were increased, affecting on the exfoliation behaviors of the MMT layers in clay/PEO nanocomposites. From ion-conductivity results, the organic-MMT showed higher values than those of
, and the MMT-20A sample that was treated by methyl dihydrogenated tallow ammonium, showed the highest conductivity in this system.
Resistive Humidity Sensor from Copolymers Containing Quaternary Ammonium Salt (II): Four Component Copolymers
Lee, Dong-Geun ; Lim, Tae-Ho ; Jeon, Young-Min ; Gong, Myoung-Seon ;
Polymer Korea, volume 31, issue 4, 2007, Pages 302~307
The resistive-type humidity sensors were prepared from the copolymers of [2-[(methacryloyloxy)ethyl]dimethyl]propylamonium bromide (MEPAB), [2-[(methacryloyloxy)ethyl]-2-hydroxyethyl]dimethylammonium bromide (MEHDAB), 2- [(methacryloyloxy)ethyl]trimethylammonium chloride (METAC), and n-butyl methylacrylate (MBA). Four component copolymers MEPAB/BMA/MEHDAB/METAC=4/4/1/1, 3/5/1/1, 2/6/1/1, 1/7/1/1 crosslinked with blocked-isocyanate on Ag/Pd electrode/alumina substrate showed a good durability at high humidities. The various electrical properties such as frequency dependency, temperature dependency, hysteresis, response time and water durability were examined. In the case of copolymer composed of MEPAB/BMA/MEHDAB/METAC=2/6/1/1, the resistance varied from
in the range of
and this copolymers showed a good linearity and low hysteresis.
Fabrication of a Film Coated with Conducting Polymer Using One Atmospheric Pressure Plasma
Jung, Jin-Suk ; Yang, In-Young ; Myung, Sung-Woon ; Choi, Ho-Suk ; Kim, Jong-Hoon ;
Polymer Korea, volume 31, issue 4, 2007, Pages 308~314
A composite film of polyurethane(PU)-graft-poly(acrylic acid) (PAAc)/polyaniline (PU-g-AAc/PANI) was successfully fabricated for the purpose of adding conductivity on the surface of a general purpose polymer and improving adhesive property between the general purpose polymer and conducting polymer layer. The results from ATR-FTIR and XPS analyses also supported the successful synthesis of the composite film by showing characteristic peaks for every step. A low surface resistivity of
proved the surface conductivity of synthesized PU-g-AAc/PANI film and the surface resistance decreased with increasing the amount of grafted AAc, which acted as a dopant for PANI film.
Synthesis of High Loading PONF-g-GMA Anion Exchange Fiber Containing Ion Exchange Resin and Their Adsorption Properties of Vanadium
Baek, Ki-Wan ; Park, Seung-Wook ; Nho, Young-Chang ; Hwang, Taek-Sung ;
Polymer Korea, volume 31, issue 4, 2007, Pages 315~321
Aminated PONF-9-GMA ion exchange fabrics were synthesized by radiation induced graft copolymerization. Hybrid ion exchange fabrics combined with aminated PONF-g-GMA fabrics and anionic ion exchange resin were also fabricated by hot melt adhesion method and then their adsorption properties were investigated. Ion exchange capacity of the hybrid ion exchange fabrics was higher than ion exchange fabric and was lower than bead resin. The maximum value was 4.18 meq/g. Adsorption breakthrough time for vanadium of the hybrid ion exchange fabric was 550 min, which was faster than bead resin but slower than fibrous ion exchanger. The Breakthrough time of the hybrid ion exchange fabrics gets longer with increasing pH. The initial breakthrough time occurred around 400 min with increasing vanadium concentration.
Preparation of Mono-dispersed Polyamide 6(Nylon 6) Micro-particle
Cho, Hangu-Gu ; Kim, Hyung-Joong ;
Polymer Korea, volume 31, issue 4, 2007, Pages 322~328
Mono-dispersed polyamide 6(Nylon 6) micro-particles sized in
diameter were prepared by dispersion polymerization of
in liquid paraffin as a dispersion medium. Potassium metal(K) as a catalyst was separately added twice over the anionic ring-opening polymerization of
. The size, shape, and size-distribution of prepared particles were varied with the concentration of anti-coagulant as well as the amount of initiator and catalyst. As the initiator concentration was in the range of
in monomer, about 90.6% of yield was accomplished. In addition, the highest yield of well-spherically shaped micro-particles was achieved by adding about
The Effect of Drug Release from Osmotic Pellet Related to the Various Ratio of
RL and RS
Youn, Ju-Yong ; Ku, Jeong ; Lee, Soo-Young ; Kim, Byung-Soo ; Kim, Moon-Suk ; Lee, Bong ; Khang, Gil-Son ; Lee, Hai-Bang ;
Polymer Korea, volume 31, issue 4, 2007, Pages 329~334
Osmotic pellet system, which is one of the oral drug delivery systems, has been developed to improve manufacturing process, reduce product cost and other problems of osmotic tablet systems. Osmotic pellet is consisted of water swellable seed layer, drug layer, and membrane layer. Among them, the membrane layer plays an important role in a control of the drug release. In this work, we examined the effect of ratio for Eudragit RL and RS on the drug release behavior. Osmotic pellet with nifedipine as a model drug was easily obtained in a good yield by fluidized bed coater. Osmotic pellet showed round morphology with a range of size
. In the experiment of nifedipine release, the release amount increased with the increase of the ratio of Eudragit. This is due to the fact that Eudragit RL contains more hydrophilic quaternary ammonium group than Eudragit RS. Additionally, the release amount was retarded with increasing the membrane thickness. There are no differences in the release amount measured at the different pH 1.2, 6.5, 6.8, and 7.2. In conclusion, it was found that the drug release from osmotic pellets depended on the composition ratio and coating thickness of membrane layer.
Effect of Long Time Physical Aging on Ultra Thin 6FDA-Based Polyimide Films Containing Carboxyl Acid Group
Im, Hyun-Gu ; Kim, Joo-Heon ; Lee, Hyuk-Soo ; Kim, Tae-Min ;
Polymer Korea, volume 31, issue 4, 2007, Pages 335~342
The goal of this study is to investigate the effect of molecular structure modifications on the kinetics of physical aging of thin films formed from 6FDA-based polyimides with time. The permeability for 6FDA-based polyimide thin films containing carboxyl acid groups commonly decreased 20-50% after the isothermal aging and the selectivity gained anywhere from 10% to 30% while the rate of permeability loss on the change of polymer structure showed different reciprocal relationship between 6FDA-6FpDA based polyimides and 6FDA-DAM based polyimides. The Lorenz-Lorentz equation was used to relate changes in refractive index to densification and volume relaxation with aging time. The permeability as a function of aging time fits the expected form
. The results matched well with the data for different polymer membranes.
Curie Temperature Transition According to Microstructure of Polymer Chain in Poly(VDF/TrFE/CTFE) Terpolymer
Kim, Eun-Kyoung ; Lee, Sang-Goo ; Ha, Jong-Wook ; Park, In-Jun ; Lee, Soo-Bok ; Park, Cheol-Min ; Kim, Young-Ho ;
Polymer Korea, volume 31, issue 4, 2007, Pages 343~348
In this study, terpolymer of vinylidene fluoride (VDF), trifluoroethylene (TrFE), and chlorotrifluoroethylene (CTFE) were prepared by suspension polymerization using di-tertiary-butyl peroxide (DTBP) as an initiator. The structural characteristics including microstructure and chain conformation of the polymers have been carefully elucidated as a function of the chemical composition using NMR, FT-IR. The intensity of absorption bands of the
-phase gradually decreases and the
-phase increases with the increment of CTFE mol%. The analysis results of DSC shows that the Curie phase transition temperature (
) of the terpolymer gradually shifts to ambient temperature and trace becomes smaller and broader with the increment of CTFE mol%. Also, activation energies of the samples were calculated by Freeman-Carroll method.
Syntheses and Swelling Behaviors of Poly(n-isopropylacrylamide-co-acrylonitrile) Hydrogels
Piao, Zhe Fan ; Ham, Myong-Jo ; Kim, Young-Ho ;
Polymer Korea, volume 31, issue 4, 2007, Pages 349~355
Poly(N-isopropylacrylamide-co-acrylonitrile) [P(NIPAAm-co-AN)] copolymers with AN content of up to 10 mol% and their hydrogels were synthesized using water as a reaction medium, and the effects of AN unit incorporation on the critical gel transition temperature(CGTT) and swelling behaviors of the hydrogels were investigated. The CGTT of the copolymer hydrogel was
, decreasing with increasing AN content. Below CGTT, swelling rate and equilibrium swelling ratio of the copolymer hydrogel decreased with increasing AN content. On the other hand, it exhibited faster deswelling and lower equilibrium deswelling ratio with increasing AN content above CGTT.
Infulence of Spacer and Degree of Esterification on Thermotropic Liquid Crystalline Properties of Amyloses Bearing Cholesteryl Group
Jeong, Seung-Yong ; Ma, Yung-Dae ;
Polymer Korea, volume 31, issue 4, 2007, Pages 356~367
Three kinds of amylose derivatives such as: cholesteryloxycarbonated amyloses(CAMs) with degree of esterification(DE) ranging from 1.8 to 3, (6-cholesteryloxycarbonyl)pentanoated amyloses(PAMs) with DE ranging from 0.3 to 3, and fully cholesteryloxycarbonated PAMs(CPAMs) were synthesized, and their thermotropic liquid crystalline properties were investigated. CAMs with
, PAM with DE=1.6 and all the CPAMs formed enantiotropic cholesteric phases, whereas PAM with
exhibited monotropic cholesteric phases. PAM with
and CPAMs with (6-cholesteryloxycarbonyl)pentanoyl DE (DS) more than 1.0 formed cholesteric phases with left-handed helical structures whose optical pitches (
) decrease with increasing temperature. However, the
of these samples decreased with increasing DS at the same temperature. On the other hand, CAMs, PAM with DE=1.6, and CPAM with DS=0.3 did not display reflection colors over the full cholesteric range, suggesting that the helicoidal twisting power of the cholesteryl group highly depends on the length of the spacer joining the cholesteryl group to the main chain and DS. The thermal stability and degree of order in the mesophase observed for the amylose derivatives highly depended on DE or DS. The results were discussed in terms of the difference ul the hydrogen bond, the internal plasticization, and the decoupling of the motion of side group with the main chain.