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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Textile Science and Engineering
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Journal DOI :
The Korean Fiber Society
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Volume & Issues
Volume 52, Issue 6 - Dec 2015
Volume 52, Issue 5 - Oct 2015
Volume 52, Issue 4 - Aug 2015
Volume 52, Issue 3 - Jun 2015
Volume 52, Issue 2 - Apr 2015
Volume 52, Issue 1 - Feb 2015
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Density Functional Theory Study on Polybenzimidazole with Sulfonic Acid Functional Group for PEMFC Applications
Kwon, Soonchul ; Lee, Seung Geol ;
Textile Science and Engineering, volume 52, issue 3, 2015, Pages 137~142
DOI : 10.12772/TSE.2015.52.137
In this study, we performed density functional theory (DFT) calculations to elucidate the effect of sulfonic acid functional group on the hydrophilicity of polybenzimidazole (PBI). We investigated the adsorption of
molecules on sulfonated PBI (SPBI) and on disulfonated PBI (DSPBI) with cis- or trans-conformation. We analyzed electronic properties such as charge re-distribution and electronic band gap in terms of the optimized structure of PBI systems. We found that PBI with higher degree of sulfonation shows greater hydrophilicity and that trans-DSPBI shows greater hydrophilicity than cis-DSPBI.
Synthesis of High Molecular Weight Poly(m-phenylene terephthalamide) in NMP/CaCl
Lee, Woo-Seung ; Yim, Jong-Ha ; Ahn, Ji-Hoon ; Son, Tae-Won ;
Textile Science and Engineering, volume 52, issue 3, 2015, Pages 143~150
DOI : 10.12772/TSE.2015.52.143
A new solvent was developed for the synthesis of a high-molecular-weight aramid polymer, PMTA, which is a low-weight form of poly(m-phenylene terephthalamide). The condensation method was optimized to obtain the best-grade polymer. HCl liberated from the optimized polymer was neutralized with CaO and the polymer was characterized. A series of neutralization experiments were performed to determine the relationships between the viscosity properties and the experimental conditions. The PMTA properties were characterized by instrumental analysis.
Electromagnetic Interference Shielding Effectiveness of Electroless Nickel Plating and Anodization on Modified Carbon Nanotubes/Epoxy Composites
Ham, Eun-Kwang ; Ko, Jae-Kyoung ; Choi, Woong-Ki ; Kim, Young-Keun ; Seo, Min-Kang ;
Textile Science and Engineering, volume 52, issue 3, 2015, Pages 151~158
DOI : 10.12772/TSE.2015.52.151
In this work, the influence of electroless nickel-plated and anodized carbon nanotubes (CNT) on the electromagnetic interference shielding effectiveness (EMI-SE) properties of CNT/epoxy composites was studied. The surface properties of modified CNT were measured by field emission scanning electron microscopy and X-ray photoelectron spectroscopy. The composites were prepared by adding 7 wt% modified CNT to epoxy. The EMI-SE of the composites was evaluated through reflection and absorption loss in the frequency range of 30 MHz-1.5 GHz. The electric conductivity was measured using a 4-point-probe electric resistivity tester. The results show that, the EMI-SE of the composites with 3 min nickel-plated CNT was the highest. The reflection loss of anodized CNT was found to be sharply increased in the frequency range of 1.25-1.35 GHz. In addition, the reflection loss of modified CNT was improved, but the absorption loss was decreased, respectively. This was probably because electroless nickel-plating and anodization led to the improvement in the polarity of the CNT surface which increased the EMI-SE of the composites.
A Simple Analysis Method to Predict the Large Amplitude Oscillatory Shear (LAOS) Flow Behavior of Viscoelastic Polymer Liquids
Chang, Gap-Shik ; Ahn, Hye-Jin ; Song, Ki-Won ;
Textile Science and Engineering, volume 52, issue 3, 2015, Pages 159~166
DOI : 10.12772/TSE.2015.52.159
Using an Advanced Rheometric Expansion System (ARES), the dynamic viscoelastic behavior of aqueous poly(ethylene oxide) (PEO) solutions with various molecular weights and different concentrations has been investigated in large amplitude oscillatory shear (LAOS) flow fields over a wide range of strain amplitudes. In order to predict the nonlinear viscoelastic behavior of polymer liquids in strain-sweep experiments, a new analysis method including a simple empirical model was proposed and then its validity was thoroughly evaluated in this study. The results have shown that the suggested model is significant in 95% confidence level and predicts exactly the nonlinear viscoelastic behavior of polymer liquids over a whole range of strain amplitudes tested. The strain limits of linear viscoelastic response and nonlinear behavior indices were determined using this model to estimate the LAOS flow behavior in strain-sweep experiments. The master curves of strain limits and nonlinear behavior indices can be obtained by representing these data against the product of angular frequency by characteristic time. The LAOS flow behavior of polymer systems with various molecular weights and different concentrations can well be predicted from these master curves.
Durability Test of Slitting Belt for Belt Bridle
Chun, Sang Hoo ; Bok, Jin Sun ; Park, Jae Woo ; Chun, Du Hwan ;
Textile Science and Engineering, volume 52, issue 3, 2015, Pages 167~171
DOI : 10.12772/TSE.2015.52.167
This study aimed to investigate a durability test of a textile composite belt for use in steel slitting. The belt was developed by combining scrim fabric and a nonwoven sheet composite with resin impregnation and a silicon finish. Because resin impregnation is necessary for a textile composite slitting belt, this study focussed primarily on examining two different types of resin influencing the belt durability, namely, thermosetting resin PVB and thermoplastic resin PET. The accelerated test conditions were obtained through a performance comparison with reference belt (50 hr with 500N load). The results indicate that thermosetting PVB is more suitable for the overall durability of a belt under repeated load conditions with friction when compared to thermoplastic PET, although PVB tends to increase the brittleness in comparison when compared to PET.
Relationships between Steady and Transient Flow Functions for Viscoelastic Polymer Liquids: Experimental and Theoretical Examination of the Gleissle Mirror Relations
Kwak, Yun-Jeong ; Ahn, Hye-Jin ; Song, Ki-Won ;
Textile Science and Engineering, volume 52, issue 3, 2015, Pages 172~184
DOI : 10.12772/TSE.2015.52.172
The objective of this study is to systematically investigate the relationships between steady flow functions and transient flow functions for viscoelastic polymer liquids. Using a strain-controlled rheometer (Advanced Rheometric Expansion System (ARES)), the steady shear flow properties and the transient shear flow properties of concentrated poly(ethylene oxide) (PEO) solutions have been measured over a wide range of shear rates and times. The validity of the three forms of the Gleissle mirror relations was examined by comparing them with the experimentally obtained results. In addition, the effect of nonlinearity on the applicability of these Gleissle mirror relations was discussed from a theoretical view-point by introducing the concept of a nonlinear strain measure. The main findings obtained from this study can be summarized as follows: (1) A nonlinear strain measure is decreased with an increase in strain magnitude, after reaching the maximum value at small strain range. This behavior is quite different from the theoretical prediction to satisfy the conditions of the Gleissle mirror relations. (2) The first mirror relation describing the equivalence between steady shear flow viscosity and shear stress growth coefficient is valid over a wide range of shear rates and is hardly affected by the nonlinearity of polymer solutions. (3) The second mirror relation expressing the equivalence between first normal stress coefficient and first normal stress growth coefficient is also applicable over a wide range of shear rates. This relation is, however, significantly influenced by the degree of nonlinearity (i.e., shape of a nonlinear strain measure) of polymer solutions. (4) The third mirror relation can be regarded as a very useful empirical model to predict the first normal stress coefficient from steady shear flow viscosity data, provided that an appropriate value of a shift factor is given.
Preparation and Characterization of Silver Nanoparticles by Polyols at Different Reduction Rates
Park, Hanna ; Kim, Min Hee ; Park, Won Ho ;
Textile Science and Engineering, volume 52, issue 3, 2015, Pages 185~192
DOI : 10.12772/TSE.2015.52.185
In this study, silver particles were prepared using two polyols at different reduction rates under controlled experimental conditions. Isosorbide was employed as a novel polyol reductant for silver particles, and its reduction rate in the polyol process was compared with ethylene glycol (EG). When the isosorbide reductant was used in the polyol process, silver particles could be formed. However, the reduction rate of isosorbide was slower than that of EG, and the resultant silver particles thus had anisotropic shapes. Additionally, the size of silver particles was dependent on the presence and amount of the PVP stabilizer. Therefore, the shape and size of silver particles were mainly affected by the reduction rate and stabilizer, respectively.
Sound Absorption Characteristics Based on the Woven Fabric Density and Position Variations
Lee, Kyoung Min ; Chun, Du Hwan ; Chun, Sang Hoo ;
Textile Science and Engineering, volume 52, issue 3, 2015, Pages 193~198
DOI : 10.12772/TSE.2015.52.193
Sound absorbing materials are generally categorized as porous-type absorbers and panel-type absorbers. In addition, their absorbing mechanism is typically described as a conversion of sound energy into heat energy through the dynamic behavior of the material. Thus one of the important parameters influencing the sound absorption characteristics is the density of the material. This study investigated the sound absorption characteristics of a mesh fabric based on the mesh density and fabric layering structure. Four different mesh densities (130, 180, 200, and 230 T) combined with five different layering structures were investigated to help understand the mechanism and effect of the sound absorption characteristics. The results indicate that a panel-type absorber has better sound absorption characteristics within a lower frequency range, whereas a porous-type absorber performs better at a higher frequency. In addition, the increased fabric density of the mesh fabric shows a better performance in terms of sound absorption. An empirical equation between the sound absorption coefficient and the fabric density was also derived for further design applications.
A Study on the Design of Dye-sensitized Solar Cells Using Textile Photoelectrodes and Their Electrical Properties
Lee, Hye Mi ; Yun, Min Ju ; Kim, Han Seong ;
Textile Science and Engineering, volume 52, issue 3, 2015, Pages 199~205
DOI : 10.12772/TSE.2015.52.199
In this study, we designed and investigated textile-type flexible dye-sensitized solar cells (DSSCs) using titanium mesh as the photoelectrode. To improve the surface area of the
photoelectrode and the performance of the DSSCs, titanium-oxide nanotubes (TNTs) were uniformly grown on the surface of the titanium mesh using anodization. The TNTs were tens of micrometers in length, which contributed to the absorption of sufficient light and effective transfer of electrons. We studied the effect of TNT growth on the DSSCs, and found that the power conversion efficiency of the DSSCs increased from 1.9% to 3.2% upon increasing the length of the TNTs on the surface of the titanium mesh.
Thermal Decomposition Activation Energy of Liquid Crystalline Epoxy Composite with Zirconia Filler
Moon, Hee Jung ; Kim, Kyung Ho ; Hwangbo, Sejin ; Cho, Seung Hyun ;
Textile Science and Engineering, volume 52, issue 3, 2015, Pages 206~214
DOI : 10.12772/TSE.2015.52.206
A liquid crystalline thermosetting epoxy 4,4`-diglycidyloxy-
-methylstilbene (DOMS) was synthesized using sulfanilamide as the curing agent. To heat cure the epoxy, filler contents of 0.5-5 wt% zirconia were used. Thermogravimetric analysis was performed, and the activation energy was calculated using the Kissinger and Flynn-Wall methods. The activation energy was proportional to the amount of zirconia used. As the activation energies needed for 1% and 10% decomposition were similar, the thermal decomposition was predicted to have the same mechanism.