• Title/Summary/Keyword: Textile Structures

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Study of HOMO and LUMO Energy Levels for Spirolactam Ring Moiety Using Electrochemical Approach

  • Kim, Hyungjoo;Lee, Sehoon;Son, Young-A
    • Textile Coloration and Finishing
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    • v.25 no.2
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    • pp.83-88
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    • 2013
  • Rhodamine dyes have been studied in various scientific areas due to their excellent photophysical properties. In particular, these rhodamine dyes are one of the most famous fluorophores as signal unit in chemosensor study. This is related to spirolactam ring system in rhodamine dyes. When the spirolactam ring is closed, there is nonfluorescence and colorless. Whereas, ring-opening of the corresponding spirolactam induces strong fluorescence and color. These absorption and emission changes are related to structural changes as well as electron energy potential levels such as HOMO and LUMO values. In this study, two different structures of rhodamine 6G hydrazide depending on the spirolactam ring system were investigated using absorption measurement, electrochemical measurement and computational calculations.

A Study on the Properties of Poly(vinyl alcohol)/Milk Casein Blend Fibers (Poly(vinyl alcohol)/Milk Casein Blend Fiber의 제조와 물성)

  • Kim, Kyung-Sook;Jeong, Young-Jin;Kim, Han-Do
    • Proceedings of the Korean Fiber Society Conference
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    • 2003.10b
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    • pp.27-30
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    • 2003
  • Casein, a milk protein is used in food, paper, leather and textile industries. The milk casein fiber was developed 1935 first. The strong point of milk casein fiber, the contraction is fewer the wool when washing and damage of harmful insect is smaller than wool.[1] But proteins are the major category of natural polymers that are difficult to be processed into fibrous forms. This is because of their complex macromolecular and three-dimensional structures as well as strong inter- and / or intra molecular forces.[2] (omitted)

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Density Functional Theory Study on D-π-A-type Organic Dyes Containing Different Electron-Donors for Dye-Sensitized Solar Cells

  • Song, Jing;Xu, Jie
    • Bulletin of the Korean Chemical Society
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    • v.34 no.11
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    • pp.3211-3217
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    • 2013
  • Density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations have been employed to investigate the molecular structures and absorption spectra of three D-${\pi}$-A-type organic dyes (C1-1, D5 and TH208) containing identical ${\pi}$-spacers and electron acceptors, but different aromatic amine electron-donating groups (tetrahydroquinoline, triphenylamine and phenothiazine). The coplanar geometries indicate that the strong conjugation is formed in the dyes. The electronic structures suggest that the intramolecular charge transfer from the donor to the acceptor occurs, and the electron-donating ability of tetrahydroquinoline is stronger than those of triphenylamine and phenothiazine. The computed orbital energy levels of these dyes confirm that the electrons could be injected from the excited dyes to the semiconductor conduction band and the oxidized dyes could be reduced effectively by electrolyte. The TD-DFT results show that the CAM-B3LYP/6-31+G(d, p) is suitable for calculating the absorption spectra. The first absorption band for these dyes is assigned to the HOMO${\rightarrow}$LUMO and HOMO-1${\rightarrow}$LUMO transitions.

Linear and network structures of polymer electrolyte based on phosphate and polyether copolymers

  • Kim, Jun-Young;Kim, Seong-Hun
    • Proceedings of the Korean Fiber Society Conference
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    • 1998.10a
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    • pp.232-235
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    • 1998
  • ion conducting polymers have been extensively investigated because of their potential application as an electrolyte in solid state batteries [1]. Among the polymer electrolytes, solid polymer electrolytes (SPEs) composed of ion conducting polymer and alkali metal salt have many advantages such as high ionic conductivity, high energy density and light weight. This made them suitable replacement for liquid electrolytes. (omitted)

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Electrical Conductivity of Polypyrrole/Copolyester Composite Films. 1. Composite Films Prepared from $FeCl_3$/Copolyester Solution

  • Lee, Seong-Mo;Baik, Doo-Hyun
    • Proceedings of the Korean Fiber Society Conference
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    • 1998.10a
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    • pp.49-52
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    • 1998
  • Preparation of conducting Polymer composites by Polymerizing Polypyrrole in thermoplastic polymer matrices has been studied by many researchers in order to enhance the stability and the Physical Properties of polypyrrole. In the previous study4 we examined the effects of the ionic group content and the copolyester molecular structures on the electrical conductivity of conductivity of polypyrrole(PPy)/copolyester composite films. (omitted)

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Electromagnetic Wave Shielding Effectiveness of Electroless Chemical Copper and Nickel Plating PET fabrics (구리와 니켈 금속이 무전해 도금된 폴리에스테르 섬유의 구조에 따른 전자파 차폐성)

  • Chun, Tae-Il;Park, Jung-Hwan
    • The Korean Fashion and Textile Research Journal
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    • v.10 no.3
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    • pp.385-388
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    • 2008
  • Four kinds of PET fabrics were coated with Copper and Nickel by electroless chemical plating, and the electromagnetic wave shielding effectiveness for those samples have been examined. The shielding effectiveness showed between 90 dB and 70 dB, and it related to the fabric structure, such as cover factor and cloth density. The dense fabric structure showed the better shielding effect.

Deflection prediction of inflatable flat panels under arbitrary conditions

  • Mohebpour, S.R.
    • Structural Engineering and Mechanics
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    • v.45 no.6
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    • pp.853-865
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    • 2013
  • Inflatable panels made of modern and new textile materials can be inflated at high pressure to have a high mechanical strength. This paper is based on the finite element method as a general solution to determine the characteristics of deformed inflatable panels at high pressure in various end and loading conditions. Proposed method is based on the construction of weak form of formulation and application of Reduced Integration Element method (RIE) to solve the numerical problem of shear locking. The numerical results are validated as an outcome of comparison with other published results.

Textile Surface Modification by Environmentally Friendly Waterborne Fluorinated Acrylate Copolymer (환경친화형 수분산성 불소 아크릴레이트 공중합체에 의한 섬유 표면개질)

  • Yoo Su-Yong;Kim Jung-Du;Moon Myung-Jun;Suh Cha-Su;Ju Chang-Sik;Lee Min-Gyu
    • Journal of Environmental Science International
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    • v.13 no.10
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    • pp.947-953
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    • 2004
  • Waterborne fluorinated acrylate copolymer (WFAC) for surface modification of textile was synthesized from perfluoroalkyl ethyl acrylate, octadecyl acrylate, glycidyl methacrylate, surfactant and 3,3 methyl-methoxy butanol. The structures of the synthesized WFAC were determinated by FT-IR and $^{19}F-NMR$ analysis. The thermal stability investigated with DSC and TGA was decreased with increasing the content of fluorinated acrylate in the copolymer. However, the particle sizes of WFAC were increased with increasing the content of fluorinated acrylate in the copolymer. The surface energies calculated by contact angles of WFAC were in the range of 29.80$\~$13.41 dyne/cm. On the observing SEM of the textile surface treated with WFAC, the textile was swollen and compacted with increasing the concentration of water repellency agent. WFAC synthesized in this study showed a good water repellency.

Textile Structural Design with Fabric Flexibility using SLS 3D Printing Technology (SLS 3D 프린팅 기술을 적용한 직물 유연성이 발현된 직물구조적인 설계디자인)

  • Song, HaYoung
    • Journal of Fashion Business
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    • v.24 no.3
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    • pp.85-100
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    • 2020
  • Recently, 3D printing technology, which is suitable for small-volume production of many varieties, has become considered a key manufacturing technology in the 4th industrial revolution. However, the nature of 3D printing technology means it is not yet able to be applied to traditional textiles due to Fabric Flexibility. The aim of this study is to investigate Textile Structural Design by finding the optimal yarn thickness for Selective Laser Sintering (SLS) 3D printed structures on geogrid dobby woven fabric that gives the optimal flexibility and tensile strength in the final product. The test results for tensile load strength of the 3D printed test samples, using 1.0mm, 0.8mm, 0.6mm and 0.4mm yarn thicknesses, showed that all were found to be above 250N, this higher than the tensile strength of 180N that is recommended for textile products. Based on these results, the four dobby structural patterns with 3D printing produced had four yarn thicknesses: 1.0mm, 0.8mm, 0.6mm, and 0.4mm. The thinner the yarn, the more flexible the fabric; as such the optimal conditions to produce SLS-based 3D printed textiles with suitable strength and flexibility used a thickness of yarn in the range of 0.4mm to 0.6mm.