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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 30, Issue 6 - Nov 2006
Volume 30, Issue 5 - Sep 2006
Volume 30, Issue 4 - Jul 2006
Volume 30, Issue 3 - May 2006
Volume 30, Issue 2 - Mar 2006
Volume 30, Issue 1 - Jan 2006
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Electrochromism of Various Conducting Polymers with Enhanced Functionality
Ko Heung-Cho ; Moon Bong-Jin ; Lee Hoo-Sung ;
Polymer Korea, volume 30, issue 5, 2006, Pages 367~372
Electrochromic materials based on conducting polymers with pendant chromophores as well as their electrochromic properties are described. The conducting polymers described aye polypyrrole, polythiophene, poly(3,4-ethylenedioxythiophene), poly (cyclopentadithiophene), and poly (1,4-bis [2- (3,4-ethylenedioxy) thienyl] benzene). The chromophores described are viologen and perylenetetra-carboxylic diimide. When the wavelength ranges of absorption of the conducting polymer and the chromophore aye not overlapping, multiple electrochromism was achieved. When the wavelength ranges are largely overlapping, higher contrast was achieved. An easy method for prediction of the film thickness for maximum contrast of a given electrochromic material is also described.
Synthesis and Photopolymerization of Discotic Liquid Crystals Containing Hydrogen Bondings and Two Polymerizable Groups
Lee Jun-Hyup ; Lee Seung-Jun ; Jang Ji-Sun ; Jho Jae-Young ;
Polymer Korea, volume 30, issue 5, 2006, Pages 373~379
Polymerizable discotic liquid crystals containing diacetylene and acryloyl groups were formed through hydrogen bonding between phloroglucinol core and polymerizable pyridine derivatives, and their photopolymerization behavior was investigated. The discotic complexes exhibited discotic columnar and rectangular columnar mesophases depending on the number of aromatic rings. Photopolymerization of the discotic complexes was carried out by UV irradiation in the liquid crystalline state. IR and UV-Vis spectroscopy affirmed that diacetylene and acryloyl groups were selectively Polymerized, and that crosslinked polymers containing short conjugated diacetylene oligomers were produced by 1,4-addition. X-ray diffraction experiment showed that the columnar order in the discotic complex containing phenyl-pyridine moiety was maintained after photopolymerization, and that the rectangular columnar order in he discotic Complex with biphenyl units was changed to the lamellar order.
Organic-Inorganic Nanocomposites of Polystyrene with Polyhedral Oligomeric Silsesquioxane
Kim Kyung-Min ;
Polymer Korea, volume 30, issue 5, 2006, Pages 380~384
Polyhedral oligomeric silsesquioxanes (POSS) were used as starting materials for the preparation of hybrid materials with polystyrene (PS). Optically transparent hybrids were obtained in a wide range of weight ratios when phenyl groups were introduced to each corner of the silsesquioxane. In contrast, as cyclohexyl groups were introduced, the obtained hybrid materials with PS resulted in turbid films. The aromatic (
) interaction was confirmed to be a quite effective tool for the synthesis of organic-Inorganic polymer hybrids with POSS. The obtained homogeneous and transparent hybrid films could be dissolved in solvents and East again without any separation. The homogeneity of polymer hybrids with POSS was supported by the result of scanning electron microscopy (SEM), X-ray diffraction (XRD), and differential scanning calorimetry (DSC), which demonstrated a nanometer-level integration of PS and POSS.
Thermal, Frictional and Wear Behavior of Carbon Nanofiber/Poly(methyl methacrylate) Composites
Park Soo-Jin ; Im Se-Hyuk ; Lee Jae-Rock ; Rhee John-M. ;
Polymer Korea, volume 30, issue 5, 2006, Pages 385~390
In this work, the effect of carbon nanofiber (CNF) on thermal properties, and friction and wear behavior of CNF/PMMA composites were examined. While thermal properties of the composites were investigated with differential scanning calorimetry, thermograyimetric analyzer, and dynamic mechanical analyzer friction and wear behaviors were examined using a friction and wear tester. The glass transition temperature (Tg), integral procedural decomposition temperature (IPDT), storage modulus (E'), and tan
appeared at higher temperatures with increasing CNF content, which were probably attributed to the presence of strong interactions between the carbonaceous fillers and the PMMA resins matrix. The wear loss in the composites decreased at 0.1 wt% CNF and then increased with 5-10 wt% CNF content. This was due to the existence of large aspect ratio CNF in PMMA which led to an alignment of PMMA chains and an increase of mechanical interlocking, resulting in the formation of crosslinked structures between CNF and PMMA in the composite.
Hydrophilicity Improvement of Polyamide66/Polyphenylene Blends by Plasma Surface Treatment
Ji Young-Yeon ; Kim Sang-Sik ;
Polymer Korea, volume 30, issue 5, 2006, Pages 391~396
It has been reported that plasma treatments are used to modify surface properties of polymers such as adhesivity hydrophobicity and hydrophilicity. Using plasma treatment, interfacial pro-perty can be introduced to a polymer surface without affecting the desired bulk properties of a material. In this study, commercial polyamide66 (PA66) /polyphenylene (PPE) polymer was modified by plasma treatment under a various gas specious for elimination of organic compound and polymer surface property with hvdrophilicity. PA66/PPE polymer with hydrophilicity was treated by RF plasma vacuum system under a various parameter such as gas specious, processing time and partial pressure. Hydrophilicity of PA66/PPE was confirmed by calculation of the surface free energy from contact angle measurement. The highest surface free energy of
with the lowest contact angle of
was obtained at plasma process power of 100 W, treatment time of 2 min and
gases of 100 and 200 sccm. Moreover the change of organic compounds on the polymer surface was analyzed by fourier transforms infrared spectrometry (FTIR).
Characteristic Polypropylene Filter Coated by Titania Sol
Na Sang-Kwon ; Nah Jae-Woon ;
Polymer Korea, volume 30, issue 5, 2006, Pages 397~401
In this study, we coated the polypropylene filter with titania sol and investigated various characteristic such as its deodorization efficiency and sterilization effect of gram negative bacillus Escherichia coli(ATCC 25922) and gram positive bacillus Staphylococcus aureus(ATCC 6538). As the results, in case of titania sol coated polypropylene filter, the deodorization rate of ammonia, trimethylamin and acetic acid which cause indoor air pollution was 66%, 90% and 16% respectively. Also. the sterilization rate of gram negative bacillus Escherichia coli(ATCC 25922) and gram positive bacillus Staphylococcus aureus(ATCC 6538) was 99.9% after 24 hours.
Development of Antimicrobial Polyurethane Foam for Automotive Seat Modified by Urushiol
Hong Chae-Hwan ; Kim Hyun-Sung ; Park Heon-Hee ; Kim Youn-Hee ; Kim Sang-Bum ; Hwang Tae-Won ;
Polymer Korea, volume 30, issue 5, 2006, Pages 402~406
New antibacterial Polyurethane foams for car seat with Urushiol extracted from a natural lacquer were prepared. Influences of antibacterial agent's concentration on the reactivity with isocyanate and the mechanical properties of foams were investigated. It was observed that the urethane formation reaction was delayed a little when the amount of Urushiol was increased. However, the foams made using Urushiol showed similar property to the neat polyurethane foam. In terms of antibacterial property, the foams prepared with Urushiol showed better performance than the neat polyurethane foam.
Fabrication of Ceramic Line Pattern by UV-Nanoimprint Lithography of Inorganic Polymers
Park Jun-Hong ; Pham Tuan-Anh ; Lee Jae-Jong ; Kim Dong-Pyo ;
Polymer Korea, volume 30, issue 5, 2006, Pages 407~411
The SiC-based ceramic nanopatterns were prepared by placing polydimethylsiloxane (PDMS) mold from DVD master on the spincoated polyvinylsilaeane (PVS) or allylhydridopolycaybosilane (AHPCS) as ceramic precursors to fabricate line pattern via UV-nanoimprint lithography (UV-NIL), and subsequent pyrolysis at
in nitrogen atmosphere. As the dimensional change of polymeric and ceramic patterns was comparatively investigated by AFM and SEM, the shrinkage in height was 38.5% for PVS derived pattern and 24.1% for AHPCS derived pattern while the shrinkage in width was 18.8% for PVS and 16.7% for AHPCS. It indicates that higher ceramic yield of the ceramic precursor resulted in less shrinkage, and the strong adhesion between the substrate and the pattern caused anisotropic shrinkage. This preliminary work suggests that NIL is a promissing route for fabricating ceramic MEMS devices, with the development on the shrinkage control.
Properties of Poly(acrylic acid) Hydrogel by the Surface Charge of Magnetite Nanoparticles
Seo Dong-Pil ; Kang Hwi-Won ; Jeong Chang-Nam ;
Polymer Korea, volume 30, issue 5, 2006, Pages 412~416
The superparamagnetic nanoparticles were prepared by coprecipitation of
and the surface charge on hydroxyl group by chemisorption was changed depending on pH. We studied correlation between surface charge of magnetite and pH. Using this correlation the properties of poly (acrylic acid) (PAAc) hydrogel embedded with magnetite was studied. The magnetite was characterized by XRD, AFM. and FTIR. The zeta-potential of magnetite was influenced by pH: great positive charge was shown high under the pH 4 and isoelectric point was found at pH 7. The hydrogen bond formed by combining oi PAAc hydrogel and magnetic colloid under pH 4 caused tensile strength to increase, while swelling and elongation at break to decrease. The result confirmed that the magnetic moment was increased proportionally to the content of magnetite.
Photo-Alignment Mechanism Study of Poly(siloxane cinnamate)
Choi Ji-Won ; Lim Ji-Chul ; Song Ki-Gook ;
Polymer Korea, volume 30, issue 5, 2006, Pages 417~421
Photo -alignment of poly (siloxane cinnamate) (PSCN) was studied to better understand the alignment mechanism of cynnamoyl groups under various process conditions. DSC and polarized microscope studies showed that the isotropic temperature oi PSCN was about
and the liquid crystallinity, once formed, did not completely disappear even when the temperature went into the isotropic regions. UV/Vis absorption study suggested that the photo - dimerization was the main photo alignment mechanism and it's efficiency could be enhanced through the self-alignment of PSCN. It was also found that photo-dimerization was in competition with photo-fries reaction and the photo- alignment of PSCN was interfered with the excessive UV because of the strong photo-fries reaction. However, photo - fries reaction could be suppressed by adjusting the UV wavelength.
Pitch Variations in Cholesteric Liquid Crystal Film by Molecular Diffusion
Kwon Young-Jin ; Lee Won-Ju ; Kim Beom-Kyung ; Kim In-Sun ; Song Ki-Gook ;
Polymer Korea, volume 30, issue 5, 2006, Pages 422~425
Due to their periodic helical structure, cholesteric liquid crystals (CLC) have a unique ability to selectively reflect visible light. CLC films reflecting a broad wavelength band were prepared by inducing a pitch gradient in CLC layers through a diffusion of small molecules and through a thermal mixing of cyclic siloxane CLC molecules with different pitch lengths. Various pitch gradients in the CLC cell were observed using UV/Vis spectrometer and SEM technique.
Synthesis and Luminescent Characteristics of Anthracene Fluoroionophores
Jeon Young-Min ; Kim Jong-Gyu ; Jang Ji-Geun ; Chang Ho-Jung ; Kim Yung-Sup ; Gong Myoung-Seon ;
Polymer Korea, volume 30, issue 5, 2006, Pages 426~431
Novel azacrown ether containing blue -light emitting anthracene fluorophore, 9,10-bis [p-(1-aza-18-crown-6)methylphenyl] anthracene (3) and N,N-bis [9-(p-methylphenyl) anthracenyl-methyl] -1,6-diaza-18-crown-6 (4) were prepared by reacting anthracene derivatives 1 and 2 with mono- and diaza-18-crown-6, respectively Also, crown ether containing fluorophore copolymer (5) were prepared by reacting 1,6-diaza-18-crown-6 with 1. Their fluorescence emission spectral studies were investigated by binding group I, group II and various metal cations. The fluorophores showed an absorption at
= 372 nm and an emission at
= 430 nm. pH Dependency of fluorescence emission intensity were examined to determine the optimum pH for the fluorophores.
Studies on Ethylene and Styrene Copolymerizations with Dinuclear Constrained Geometry Complexes; Effects of Length of Bridge
Yoon Keun-Byoung ; Bae Sang-Geun ; Lee Chul-Woo ; Noh Seok-Kyun ; Lee Dong-Ho ;
Polymer Korea, volume 30, issue 5, 2006, Pages 432~436
The new dinuclear CGC (constrained geometry complexes) with indenyl and methyl sub-stituted indenyl and polymethylene bridge have been synthesized, and the copolymerization of ethylene and styrene has been studied in the presence of methylalumionoxane. The activity of 12-methylene and 9-methylene bridged dinuclear CGC were 4 times higher than that of 6-methylene bridged dinucleay CGC. This result might be understood by the implication that the steric effect rather than the electronic effect nay play a major role to direct the polymerization behavior of the dinuclear CGC. The dinuclear CGCs are very efficient to incorporate styrene in backbone. The styrene contents in the formed co-polymers ranged from 6 to 45 mol% according to the polymerization conditions. The melting temperature of copolymers disappeared at high content of styrene (about 11 mol%) There is no styrene-styrene diblock sequence in copolymers. This result Indicates that the dinuclear CGC are very effective to generate random copolymer of ethylene and styrene.
Synthesis and Characterization of Cellulose-Hybrid Polystyrene Nanoparticles by Using Reactive Hydroxypropyl Methylcellulose Phthalate
Cheong In-Woo ;
Polymer Korea, volume 30, issue 5, 2006, Pages 437~444
Reactive hydroxypropyl methylcellulose phthalate (reactive HPMCP) was synthesized by using a stepwise urethane reaction with isophorone diisocyanate (IPDI) and 2-hydroxyethyl moth acrylate (HEMA). Molecular weight, acid number, and critical micelle concentration (CMC) of the synthesized reactive HPMCP and pristine HPMCP were measured and used as a polymeric surfactant in the emulsion polymerizations of styrene. In the preparation of HPMCP-hybrid poly styrene nanoparticles, 6, 9, 12, 18, and 24 wt% of HPMCPs were introduced, and the maximum rate of polymerization (
), the average number of radicals per particle (n), particle size distribution were investigated. In addition, core - shell morphology of the nanoparticles were observed by using TEM and their thermal stabilities were measured by using TGA. Reactive HPMCP showed higher
, smaller particle size, larger values of n and gel contents as compared with pristine HPMCP, due to the vinyl groups from HEMA, which can be reacted with styrene oligomers, in the reactive HPMCP.
Interaction of Schwann Cells with Various Protein- or Polypeptide-Coated PLGA Surfaces
Park Ki-Suk ; Kim Su-Mi ; Kim Moon-Suk ; Lee Il-Woo ; Rhee John-M. ; Lee Hai-Bang ; Khang Gil-Son ;
Polymer Korea, volume 30, issue 5, 2006, Pages 445~452
In this study, we investigated interaction of Schwann cells (SCs) with various cell-adhesive coated polymer surface. We used cell-adhesives that like a fibronectin (FN), fibrinogen(FG), laminin(LM), vitronectin (VN), poly-D-Iysine (PDL), and poly-L-Iysine (PLL) to coat PLGA film surface and evaluated the surface property of coated or not PLGA films by measurement of water contact angle and ESCA. SCs were cultured on coated or non-coated PLGA film surface, and then examined the cell adhesion and proliferation by cell count and SEM observation. Cell count results revealed initial cell adhesion related to protein adsorption on PLGA surface. In addition, serum content in media related to cell proliferation rate. In this result, we recognized that adhesion and proliferation of SCs were affected by specific cell-adhesives. In these results, we recognized that is important to provide the suitable surface environment according to cell types and culture condition for improvement of cell adhesion and proliferation.