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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
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Syntheses of Phenyl Styryl Ketone Resins and Their Applications to the Uptake of Lead(II) and Copper(II) Ions in Aqueous Solutions
Akhtar Tashfeen ; Paracha Rizwan N. ; Hameed Shahid ; Rama Nasim H. ; Riaz Masud ;
Polymer Korea, volume 31, issue 2, 2007, Pages 93~97
Phenyl styryl ketone ligands 1-5 containing different functional groups were synthesized and attached to the aminated poly (styrene-divinvlbenzene) copolymer through diazotization. The coupling of the ligand with polymer was confirmed by FT-IR. The variation of the uptakes of Pb (II) or Cu (II) ions loaded in the prepared polymers (6-10) was examined at different pH values. An increase of metal uptake in the polymers was observed with the increase in pH value in aqueous solution.
Application of a New Scaling Parameter to Chain Expansion in the Systems of Polystyrene/Mixed Solvents
Park, Il-Hyun ; Lee, Dong-Il ; Hwang, Mi-Ok ; Yu, Young-Chol ; Park, Ki-Sang ;
Polymer Korea, volume 31, issue 2, 2007, Pages 98~104
The expansion behavior of polystyrene (PS) chains with various molecular weights has been investigated above Flory
temperature by viscometry after dissolving in the three different mixed solvents systems such as benzene/n-heptane, 1,4-dioxane/isopropanol, and 1,4-dioxane/n-heptane. Two different regimes are observed as increasing temperature: one regime is for the expansion of chain and the other is for the contraction. For the higher molecular weight sample of PS, the higher peak temperature showing its maximum expansion is obtained. Within a certain system of Ps/mixed solvents, the
parameter shows universality for the variation of molecular weight. But while each system of Ps/mixed solvents has shown its own different slope, the universality breaks down in the overall system of mixed solvents. However after introducing a new empirical
parameter, all data points of three different systems have dropt on one master curve and the universality of chain expansion has recovered again. Here
are defined as
, respectively and
is the critical solution temperature, and b of Schultz-Flory equation is corresponding to the effective slope in the plot of
The Optimum Solution for the Best Performance of ABS
Mun, Hong-Guk ; Kim, Dae-Su ;
Polymer Korea, volume 31, issue 2, 2007, Pages 105~110
We investigated resin, thinner, painting, and injection for analyzing the chemical effect of polymer, and made the optimum solution with the best performance of ABS (acrylonitrile butadiene styrene) resin. The effect depended on chemical material especially its chemical and physical properties instead of mechanical transformation. When we looked over ABS resin, injection, chemical material and painting, we found out thinner was the main factor for painting problem. Throughout this test, we could solve the problem, secure the system for control process and drop many factors for changing quality.
Preparation of UV-Curable Polyurethane Modified
Hybrid Film Using Sol-Gel Process
Nam, Dae-Woo ; Nam, Byeong-Uk ; Cha, Bong-Jun ; Kim, Baek-Jin ;
Polymer Korea, volume 31, issue 2, 2007, Pages 111~116
Polyurethane modified acrylate
hybrid films were prepared by ultraviolet curing and their surface properties were investigated by hardness and adhesion test. The films were examined by the manipulation of mole-ratio of organic to inorganic components. Under the silica content controlled, highly desirable films were achieved and scratch resistance and hardness property of film were also enhanced, which indicates that the crosslinked silica particles are homogeneously dispersed within PUA film.
Preparation and Characterization of Vapor-Grown Carbon Nanofibers-Reinforced Polyimide Composites by in-situ Polymerization
Park, Soo-Jin ; Lee, Eun-Jung ; Lee, Jae-Rock ; Won, Ho-Youn ; Moon, Doo-Kyung ;
Polymer Korea, volume 31, issue 2, 2007, Pages 117~122
In this work, the mechanical and electrical properties, and thermal stability of vapor-grown carbon nanofibers/polyimide (VGCNFs/PI) composite film synthesized by in-situ polymerization were investigated in terms of tensile properties, volume resistivity and thermogravimetric analysis (TGA), respectively. From the results, the addition of VGCNFs with a certain amount into polyimide led to obvious improvement in tensile strength. The volume resistivity of the films was decreased with increasing the VGCNFs content and the electrical percolation threshold appeared between 1 and 3 wt% of VGCNFs content, which was probably caused by the formation of interconnective structures among the VGCNFs in a composite system. The thermal stability of the film was higher than that of pure PI one. This result indicated that the crosslinking of VGCNFs/PI Composites was enhanced by well-distribution of YGCNFs in PI resin, resulting in the increase of the thermal stability of the resulting composites.
Toughening Mechanism and Mechanical Property in Thermoplastic Polyolefin-Based Composite Systems
Weon, Jong-Il ;
Polymer Korea, volume 31, issue 2, 2007, Pages 123~129
Toughening mechanisms and mechanical properties of three different polyolefin-based composite systems we studied using the tensile, Izod impact and double-notch lout-point-bending (DN-4PB) test, which is well known be an effective tool for probing the failure mechanism (s) around the subcritically propagated crack tip. Microscopy observations such as optical microscopy and transmission electron microscopy were carried out lot the test samples. A detailed investigation clearly shows that a variety of toughening mechanisms, i.e., shear yielding, craze, particle-matrix debonding, rubber particle cavitation, crack deflection and bifurcation, are observed around crack tip damage zone. These toughening mechanisms are responsible for the observed, improved fracture toughness. Based on this study, DN-4PB technique is sufficient to obtain the information needed to describe the fracture behavior of polyolefin-based composites as well as their corresponding toughening mechanisms.
Preparation and Thermo-Mechanical Properties of 4-Component Polyimide Films
Seo, Kwan-Sik ; Sul, Kyung-Il ; Kim, Yong-Seok ; Suh, Dong-Hack ; Choi, Kil-Young ; Won, Jong-Chan ;
Polymer Korea, volume 31, issue 2, 2007, Pages 130~135
To enhance the thermo-mechanical properties of polyimide films which have potential application for the FCCL, we have synthesized the poly (amic acid) s composed of 4-components PMDA/BTDA and PDA/ODA as monomer system, u4 then they were effectively converted into 4-component polyimide films by thermal imidization process. It has been found that CTE values in the range of
decreased with the amount of PDA, which also caused 36% and 59% increases in tensile modulus and strength respectively. And also, peel test results on 3-layered copper clad laminate using 4-component polyimide films showed excellent adhesion strength above 1.8 kgf/cm. On the basis of obtained results it can be concluded that 4-component polyimide films may be applied for the high performance FCCL base films.
Silsesquioxane/Polystyrene Hybrid Materials via Charge Transfer Interactions
Choi, Ji-Won ; Chujo, Yoshiki ;
Polymer Korea, volume 31, issue 2, 2007, Pages 136~140
Charge transfer interaction as a hybridization mechanism of silsesquioxane/polymer was tested using carbazole (electron donor) group and dinitrobenzene (electron acceptor) group. Hybridization test was conducted using films made from mixing/casting of poly (carbazole-styrene) (PS/D) and dimtrobenzyl silsesquioxane (Cube/A), and transparent hybrid films were successfully obtained under some conditions.
of PS/D and Cube/A, and W absorption test of hybrid films showed that one acceptor and one donor can form one charge transfer complex when no silsesquioxane molecule was included in films, but transparent hybrids with no phase separation were obtained only at acceptor/donor ratios less than 0.7 : 1. These results also suggested that on average 4 charge transfer complexes form per one silsesquioxane.
Dental Properties of Polymer Composite Filled with Barium Silicate Hybridized with Hydroxyapatite
Seo, Ki-Taek ; Kim, Oh-Young ;
Polymer Korea, volume 31, issue 2, 2007, Pages 141~147
Dental properties of polymer composite loaded with hybrid filler of barium silicate (BaSi) and hydroxyapatite, which is a principal component of human bone material, were investigated. A visible light system was utilized to activate the acrylic resin matrix of the composite. Based on the experimental results, it was found that mechanical strength of the composite was consistently increased with an increase of BaSi content in the hybrid filler. And those value rose above the dental specification enough to apply for dental materials. However, abrasion resistance was slightly decreased with increasing BaSi content in the filler. Depth of cure value was 6 to 9 mm applicable for dental restoration irrelevant to hybrid filler composition. On the other hand, there was no strict trend between filler composition and polymerization shrinkage as well as degree of conversion.
Improvement of Optical Characteristics in Viewing Directions in a Reflective Cholesteric Liquid Crystal Color Filter
Kim, Tae-Hyun ; Lim, Young-Jin ; Hwang, Seong-Jin ; Lee, Myong-Hoon ; Jang, Won-Gun ; Lee, Seung-Hee ;
Polymer Korea, volume 31, issue 2, 2007, Pages 148~152
The prototype of color fitters for the liquid crystal displays (LCD) using cholesteric liquid crystal monomers was produced. Cholesteric liquid crystal is characterized by the unique optical features of selective reflection, which is due to the helical twisting structures of LCs comparable to the wavelength of the incident light under certain conditions of substrate treatment. In the results of the experiment, cholesteric films for red, green, and blue light reflections respectively were produced and the viewing angle dependence of these films were investigated. Reflective light of red and green films shifted to shorter wavelength regions as viewing angle becomes greater, but blue one shifted very little. Periodic micrometer-sized half-spherical photoresist formed by thermal reflow method after photo-lithography was patterned on glass substrates. The viewing angle dependence of reflective light colors of red, green, and blue films on the patterned substrates compared with those on no patterned substrates was investigated. We could confirm the dependences were much smaller on the patterned substrates by bare eyes and Lab-color coordination methods qualitatively.
Photopolymerization and Properties of PCL-Based Biodegradable Molecularly Imprinted Polymers
Kim, Sun-Hui ; Lee, Kyung-Soo ; Kim, Yong-Hoon ; Choi, Woo-Jin ; Kim, Beom-Soo ; Kim, Eung-Kook ; Kim, Dae-Su ;
Polymer Korea, volume 31, issue 2, 2007, Pages 153~159
Biodegradable molecularly imprinted polymers (MIPs) can be applied in the biomedical area of biosensors, drug delivery, etc. Therefore, in this study, biodegradable theophylline MIPs were synthesized via photopolymerization using a poly
(PCL) macromer as a cross-linker and their physical properties were investigated. The yield for the synthesis of the PCL macromer with terminal acrylate groups was ca. 78 mol%. The products were characterized by the combination of FT-IR and
spectroscopic analyses. UV/Visible spectroscopic analysis for removing and rebinding theophylline was performed by monitoring the theophylline concentration in the solution. In vitro biodegradation tests of the theophylline MIPs performed in phosphate buffered saline (PBS) solution at
showed good biodegradability of the MIPs.
Study on the Coefficient of Thermal Expansion for Composites Containing 2-Dimensional Ellipsoidal Inclusions
Lee, Kee-Yoon ; Kim, Kyung-Hwan ; Jeoung, Sun-Kyoung ; Jeon, Hyoung-Jin ; Joo, Sang-Il ;
Polymer Korea, volume 31, issue 2, 2007, Pages 160~167
This paper proposes a model for the solutions predicting the coefficient of thermal expansion of composites including fiber-like shaped$(a_1>a_2=a_3)$ and disk-like shaped$(a_1=a_2>a_3)$ inclusions like two dimensional geometries, which was analyzed by one axis and a single aspect ratio,
. The analysis follows the procedure developed for elastic moduli by using the Lee and Paul's approach. The effects of the aspect ratio on the coefficient of thermal expansion of composites containing aligned isotropic inclusions are examined. This model should be limited to analyze the composites with unidirectionally aligned inclusions and with complete binding to each other of both matrix and inclusions having homogeneous properties. The longitudinal coefficients of thermal expansion
decrease and approach the coefficient of thermal expansion of filler, as the aspect ratios increase. However, the transverse coefficients of thermal expansion
increase or decrease with the aspect ratios.
Preparation and Characterization of Microparticles of
Containing Lysozyme by means of Supercritical Anti-Solvent (SAS) Precipitation Process
Lee, Dong-Il ; Ling, Yun ; Sung, Moon-Hee ; Park, Il-Hyun ;
Polymer Korea, volume 31, issue 2, 2007, Pages 168~176
The sub-micron particles of poly (
acid) (PGA) containing lysozyme have been prepared using supercritical antisolvent (SAS) precipitation process at various experimental conditions such as pressure, temperature, inner diameter of nozzle, and concentration. As overall results of the application of SAS process to this system, the smaller size powder has been produced as (i) increasing pressure, (ii) decreasing temperature, (iii) decreasing the inner diameter of nozzle, and (iv) decreasing the concentration of PGA and lysozyme. It is found by means of FT-IR analysis that during SAS process, the composition has changed from the original composition of PGA : lysozyme=50 : 50 into PGA : lysozyme=33 : 67 at final product powder. It means that PGA has higher solubility for the mixed solvent of carbon dioxide and dimethyl sulfoxide (DMSO). Due to such difference of solubility, this particle forms the core-shell structure of which the core consists mainly of lysozyme. It is also found that the residual DMSO amount of
exists inside the powder.