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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
Selecting the target year
Effect of NBR Component on Adhesion Behaviors between NBR and Metal Joints Using Phenol Adhesive
Lee, Dong-Won ; Park, Hae-Youn ; Yu, Young-Jae ; Kang, Dong-Gug ; Seo, Kwan-Ho ;
Polymer Korea, volume 32, issue 1, 2008, Pages 1~6
The adhesion behaviors and processability of NBR as a sealing material were investigated. In order to find the optimum formulation, the adhesive properties and processability were observed as the change of the contents of acrylonitrile (ACN) in NBR. Effects of Mooney viscosity, filler, plasticizer and crosslinking agent on the adhesion behaviors were also studied. The contents of ACN in NBR have great effects on adhesion behaviors and processability in NBR sealing. To know the optimum condition of roll mixing, degree of dispersion was investigated. It was confirmed that degree of dispersion was influenced by various factors such as mixing order, time, and temperature. The crosslinking system was studied as the observation of sulfur system, peroxide system, crosslinking density, and structure. From the variation of the dry condition and hexamine contents, the relation between adhesive and NBR was studied. These results show the adhesion properties and processability are dependent on the contents of ACN and crosslinking system.
A Study on Polypropylene and Surface Modified PET Fiber Composites
Hahm, Moon-Seok ; Kim, Chang-Hyeon ; Ryu, Ju-Whan ;
Polymer Korea, volume 32, issue 1, 2008, Pages 7~12
We confirmed that poly (ethylene terephthalate) (PET) fiber had the possibility to improve the mechanical properties of polypropylene (PP) by fabricating PP/PET fiber composites because PET enhanced mechanical properties and higher melting temperature than PP. But lower compatibility of between PP and PET fibers induced poor mechanical properties of PP/PET fiber composites in spite of incorporating PP-g-MAH as compatibilizer. To solve these problems of PP/PET fiber composites, we carried out a surface treatment on PET fiber using NaOH solution and Prepared PP/PET fiber composites with good mechanical properties by adding PP-g-MAH as a compatibilizer Then the behavior of the mechanical properties was correlated with the results obtained from SEM and IR spectroscopy.
Quantitative Extraction Analysis of Brominated Flame Retardant Substances Using Supercritical-Fluid Method for Environmental Assessment
Oh, Min-Kyung ; Yoon, Sang-Hwa ; Lee, Young-Kwan ; Han, Jae-Sung ; Won, Sung-Ho ; Nam, Jae-Do ;
Polymer Korea, volume 32, issue 1, 2008, Pages 13~18
For the evaluation of brominated flame retardants included in polymeric electronic devices, we investigated the extraction methods and solvent systems for four different types of polymers of PC (polycarbonate), PP (polyropylene), PET (poly(ethylene terephthalate)) and PBT (poly(butylene terephthalate)) using different solvent systems of hexane/acetone, THF, toluene, and THF/toluene. In order to compare the extraction efficiency of different methods and solvent systems, the deca-BDE (decabromo diphenyl ether) flame retardant was included in PC, PP, PET and PBT systems and subsequently extracted by soxhlet, ultrasonic, accelerated solvent, microwave and supercritical fluid extraction methods. The amount of the extracted flame retardant was monitored to evaluate the extraction efficiency. The ultrasonic extraction method was found not to be acceptable as an extraction method for the polymer systems mainly due to a low salvation efficiency of the organic solvents. Soxhlet, accelerated solvent and microwave extraction methods exhibited over 80% of extraction efficiency for toluene. The supercritical fluid extraction method, which has been used as an extraction method for flame retardants in polymers, showed the extraction efficiencies of ca. 100% for PC and PP in the optimal extraction conditions of
and 120 bar.
Improvement of Rheological Properties of Silica Composites Employing Response Surface Methodology
Yim, Gie-Hong ; Yang, Seung-Nam ; Kim, Nam-Ki ;
Polymer Korea, volume 32, issue 1, 2008, Pages 19~25
The purpose of this study was improving the rheology properties of dentifrice by finding optimum binders polymer system which consists of carboxymethylcellulose (CMC), carbomer, and Mg/Al silicate. Response surface methodology (RSM) was employed to investigate the correlation between polymers and rheological properties of dentifrice and to optimize responses. Rheological properties were measured with oscillatory rheometer. As a result, it was identified that gel strength and yield stress were dependent on contents of CMC and carbomer and CMC caused long stringiness of dentifrice. And springness of dentifrice was dependent on contents of CMC and Mg/Al silicate. Optimum components proportion of polymers and silicate were obtained by responses optimization process. According to determined optimum components proportion, it was possible to observe a dentifrice with improved rheological properties.
Evaluation of Various Scaffolds for Tissue Engineered Biodisc Using Annulus Fibrosus Cells
Ha, Hyun-Jung ; Kim, Soon-Hee ; Yoon, Sun-Jung ; Park, Sang-Wook ; So, Jung-Won ; Kim, Moon-Suk ; Rhee, John-M. ; Khang, Gil-Son ; Lee, Hai-Bang ;
Polymer Korea, volume 32, issue 1, 2008, Pages 26~30
This study was designed to investigate the effect of hybridization of synthetic/natural materials for annulus fibrosus (AF) tissue regeneration in vitro and in vivo. The synthetic/natural hybrid scaffolds were prepared using PLGA (poly (lactic-co-glycolic) acid), SIS (small intestinal submucosa) and DBP (demineralized bone particles). PLGA, PLGA/SIS(20%), PLGA/DBP(20%) and PLGA/SIS (10%)/DBP (10%) scaffold were manufactured by solvent casting/salt leaching method. Compressive strength was measured. Rabbit AF cells were isolated, cultured and seeded into experimental groups. Hydroxyproline production and DNA quantity of AP cells on each scaffold was measured at 2, 4 and 6 weeks after in vitro culture. Cell-scaffold composites were implanted subcutaneously into athymic mice. After 1,4 and 6 weeks postoperatively, specimens were taken and H&E, Safranin-O and type I collagen staining were carried out concerning formation of cartilagenous tissue. In vitro PLGA/SIS scaffold was evaluated for total collagen content (bydroryproline/DNA content) and PLGA scaffold was evaluated for compressive strength.
The Effect of CTBN Rubber on Mechanical Properties of Epoxy-Clay Nanocomposite
Lee, Hun-Bong ; Kim, Ho-Gyum ; Yoon, Keun-Byoung ; Lee, Dong-Ho ; Min, Kyung-Eun ;
Polymer Korea, volume 32, issue 1, 2008, Pages 31~37
The effect of MMT on mechanical properties of CTBN toughened epoxy nanocomposite is studied. In case of CTBN toughened epoxy nanocomposite with modified MMT, it is found that the enhancement of toughness and tensile properties are exhibited in CTBN toughened epoxy nanocomposite with modified MMT From the results of fractured surface morphology of sample, it is clearly shown that the improved mechanical properties can be obtained in CTBN toughened nanocomposite due to the significant energy dissipation mechanism by MMT loading.
Improvement of Barrier Property of LDPE Food Packaging Film by Plasma Polymerization
Kim, Kyoung-Seok ; Cho, Dong-Lyun ;
Polymer Korea, volume 32, issue 1, 2008, Pages 38~42
Ultrathin films were coated on low density Polyethylene (LDPE) food packaging films by plasma polymerization of methane, acetylene, hexamethyldisiloxane (HMDSO), and HMDSO+oxygen to improve the barrier property of the LDPE films. The film coated in HMDSO +oxygen (flow rate: 0.6+ 9.0 SCCM) plasma at 40 W for 10 min showed the highest improvement in the barrier property against oxygen, reducing the permeability of oxygen as much as 18.6 times. The film coated in acetylene (flow rate 0.75 SCCM) plasma at 10 W for 10 min showed the highest improvement in the barrier property against carbon dioxide and moisture, reducing the permeability of carbon dioxide and moisture as much as 12.0 and 3.0 times, respectively. In addition, cherry tomato, cucumber, and mushroom (Flammulina velutipes) wrapped with the coated films were kept fresh
times longer than those wrapped with an LDPE film.
Synthesis of Sulfonated Poly(styrene-co-DVB) Hyper Branched Cationic Exchange Resin and Its Properties
Baek, Ki-Wan ; Yeom, Bong-Yeol ; Hwang, Taek-Sung ;
Polymer Korea, volume 32, issue 1, 2008, Pages 43~48
In this study, the hyper branched poly (styrene-co-divinylbenzene) (PSD) was synthesized by bulk polymerization and the cationic exchanger with high ion exchange capacity was prepared by sulfonation. The structure of hyper branched PSD ion exchanger was investigated by FT-IR,
spectroscopy, and GPC analysis. The molecular weight, viscosity of hyper branched PSD increased with DVB content, which have the maximum values of 9410g/mol and 338 cP, respectively. And the reaction rate also increased with cross-linker content. As DVB content increased, the solubility of PSD decreased having the maximum value of 22 g with 0.1 mol% DVB. The water content and ion exchange capacity of the hyper branched PSD ion exchanger increased with the amount of sulfuric group. Their maximum values were 18.2% and 4.6 meq/g, respectively. The adsorption of copper and nickel ion was completed within 40 min.
The Effect of Transplantation of Schwann Cell and SIS Sponge on the Injured Peripheral Nerve Regeneration
Kim, Cho-Min ; Kim, Soon-Hee ; Kim, Su-Mi ; Park, Sang-Wook ; Lee, Il-Woo ; Kim, Moon-Suk ; Rhee, John-M. ; Khang, Gil-Son ; Lee, Hai-Bang ;
Polymer Korea, volume 32, issue 1, 2008, Pages 49~55
It is recognized that Schwann cells (SC) are essential for peripheral nerve development and regeneration. SIS (small intestinal submucosa) consists of some growth factors which can stimulate cell activity without immune rejection responges. SCs were harvested from the femurs and tibias of female Fischer rat and then suspended with
cell/sponge in SIS sponge. Fischer rat received an implant consisting of the SCs and the SIS sponge at the place of a 5 mm gap created by the sciatic nerve resection. Thin sections were stained with H &E staining and immunostaining of S-100, GFAP and NF after 1, 2, and 4 weeks. It was observed that the effects of the SIS sponge with SCs on neuroinduction(Group II, with scaffold & cell) are strong as much as uninjured model(Control I), and significantly stronger than SIS sponge model (Group 1, with scaffold only) and blank model (Control II). In conclusion, these results suggest that SIS sponge filled with SCs may have an important role for peripheral nerve regeneration of tissue engineering.
Synthesis of Novel Network Polyesters Containing Malonate Group in Main Chain and Their Fluorescence Image Patterning via Photodegradation
Jeong, Seon-Ju ; Kwak, Gi-Seop ; Jung, In-Tae ; Lee, Dong-Ho ; Roh, Hyung-Jin ; Yoon, Keun-Byoung ;
Polymer Korea, volume 32, issue 1, 2008, Pages 56~62
Three types of network polyesters have been newly synthesized by a two-step condensation reaction by the various combination of several diols and diacids. When these polymer films were thermally treated at
, they exhibited absorptions in a visible range despite the forbidden transition of carbonyl group. When excited at wavelengths above 330 nm, the polymers showed fluorescences in a wide visible range from blue to near yellow. These fluorescence phenomena are due to the formation of certain conjugated structures by the Knoevenagel type self-condensation under the high-temperature thermal treatment. These polymers showed significant difference in the thermal properties as a function of the degrees of chemical crosslinking. They also underwent photodegradation. Highly resolved, fluorescent image patterns were successfully obtained by the photodegradation of malonate group under a strong UV-light irradiation.
Characterizations of Cellulose Blend Films: Morphology, Mechanical Property, and Gas Permeability
Jang, Seo-Won ; Chang, Jin-Hae ;
Polymer Korea, volume 32, issue 1, 2008, Pages 63~69
The mechanical properties and morphologies of cellulose blends with two different additives were compared. Poly (vinyl alcohol) (PVA) of ethylene glycol (EG) were used as additives in the formation of cellulose blends through the solution blending. The properties of blends were varied with the additive content in the polymer matrix. The ultimate tensile strength and initial modulus of the cellulose blends were highest for a blend PVA content of 30 wt% and for a blend EG content of 10 wt%, respectively. Ternary blended systems of composition of cellulose/PVA (70/30=w/w)/EG were also prepared by the solution blending method with different EG contents. The mechanical properties of these systems were found to be optimal for EG contents of up to 40 wt%. The mechanical properties of the cellulose ternary blend films were superior to those of the cellulose binary blend films. The oxygen permeability transmission rate (
) monotonically decreased with increasing EG content in the ternary blend films. Overall, the mechanical properties of the cellulose blend films were found to be better than those of pure cellulose films.
Preparation and Properties of Aminated Poly(ethersulfone) Ion-Exchange Membrane by UV Irradiation Method
Choi, Kuk-Jong ; Hwan, Eui-Hwan ; Rhee, Young-Woo ; Hwang, Taek-Sung ;
Polymer Korea, volume 32, issue 1, 2008, Pages 70~76
The PES-g-BTCA membrane was synthesized by UV irradiation method and then used to be modified into the PES anion exchange membrane by the amination reaction. Their chemical structures and adsorption properties were investigated. The degree of grafting and amination were increased with increasing the reaction time and had the maximum values of 138% and 1.20 mmol/g at 80 min, respectively. The initial thermal degradation temperature of PES membrane was
. Which was reduced as the surface modification reaction had proceeded. The values of contact angle for PES membrane were decreased from 68.1 to
with increasing the extent of amination, the water up-take and ion exchange capacity were also increased with increasing UV irradiation time until 80 min. The average pore size and BET surface area were decreased in order of PES, PES-g-BTCA, and aminated PES ion exchange membrane. Their average pore sizes were 624.8, 359.7, and 138.5
, and their surface areas were 10.1,9.7 and 1.7
Preparation of the Blends of Poly(amic acid) and PBO Precursor and Their Properties
Yoon, Doo-Soo ; Choi, Jae-Kon ; Jo, Byung-Wook ;
Polymer Korea, volume 32, issue 1, 2008, Pages 77~84
The thermal properties, morphology, mechanical properties and gas permeability of the blends of poly (amic acid) (PAA) and poly (o-hydroxyamides) (PHAs) having pendant group was investigated. The 5% weight loss and major weight loss of the b)ends occurred in the ranges of
upon a heating process. After a thermical annealing, the tensile strength and initial modulus of blends increased
from the value of pure PAA, respectively. Especially the tensile strength and modulus of the PAA/MP-PHA=9/1 showed the highest values (97.5 MPa and 2.67 GPa, respectively), which were 53 and 70% higher than those of pure PAA. The fine PHA domains were found to be uniformly dispersed. The interfacial adhesion between PAA and PHA was identified to be good. The gas permeabilities of PAA/M-PHA blend increased with M-PHA contents.
Characterization of Ionic Liquid Contained Polymer Gel Electrolyte
Ryu, Sang-Woog ; Song, Eui-Hwan ;
Polymer Korea, volume 32, issue 1, 2008, Pages 85~89
Acrylate polymer gel electrolytes containing N-methoxymethyl-N-methylpyrrolidium bis (trifluoro - methansulfonyl) imide (MPSI) as an ionic liquid were synthesized by solution polymerization in the presence of carbonate solvent. ionic conductivity and mechanical properties of the polymer gel electrolytes were investigated by impedance analyzer and universal testing machine as a function of the amount of polymer, and ionic liquid and type of crosslinker. The maximum ionic conductivity of polymer gel electrolytes was 0.8 mS/cm at
with 15 wt% of polymer, 30 wt% of ionic liquid and 5 wt% of crosslinker. The mechanical analysis showed that the tensile strength of polymer gel electrolytes increased with additional polymer contents and had the maximum value of 0.5 MPa with a reasonable ionic conductivity.
Development of Polymeric Human Jelly Phantom for Hyper-Thermic Therapy by High Frequency Magnetic Field
Choi, Chang-Young ; Kim, Byung-Hun ; Hwang, Young-Jun ; Kim, Oh-Young ;
Polymer Korea, volume 32, issue 1, 2008, Pages 90~93
We developed a variety of polymeric jelly phantoms that can be used in hyperthermia using an electromagnetic wave as an auxiliary cancer therapy. Particularly, using an appropriate material composed of polyethylene, deionized water, and sodium chloride, jelly phantoms for brain was prepared. Also, their electrical properties were characterized by measuring the dielectric constant and conductivity. As the results, overall electrical values of the phantoms decreased with increasing the amount of the components of the materials, excepted for sodium chloride. Additionally, storage characteristics of the phantoms showed a sustainable stability up to 6 months. Based on the experimental results, it can be proposed that jelly phantoms containing a ferro-magnetic particle could be a potential material for cancer therapy following the further study on the temperature elevation effect and the evaluation of electromagnetic properties of the materials.