• Textile Coloration and Finishing
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• v.22 no.2
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• pp.83-87
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• 2010

Crystal structure of coumarin 6 has been solved by X-ray diffraction. The crystals are triclinic, space group P-1, with a=8.823(2) ${\AA}$, b=8.898(2) ${\AA}$, c=11.025(9) ${\AA}$, ${\alpha}$=86.41(3)$^{\circ}$, ${\beta}$=85.39(3)$^{\circ}$, ${\gamma}$=76.23(3)$^{\circ}$, Mr=350.42, V=837.1(3) ${\AA}^3$, Z=2 and R=0.0516. The molecules are packed parallel to each other by weaker ${\pi}{\cdots}{\pi}$ and C-H${\cdots}{\pi}$ interactions. The detailed geometry of C-H${\cdots}{\pi}$ interactions were discussed. The hydrogen bonds and non-traditional C-H${\cdots}O$ interactions join the no-parallel molecules together. All the molecules packed wall-like with the molecular brick.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2008.04a
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• pp.74-76
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• 2008

The hydrolyses of ten VS dyes were examined at 40$^{\circ}C$, 50$^{\circ}C$, and 60$^{\circ}C$ and the kinetic parameters were estimated. The values of free energy, enthalpy and entropy of hydrolysis and reaction with cellulose for VS dyes were calculated. The linear relationship exist between the enthalpy and entropy. The structure and entropy of VS dyes gave a effect on the dimerization for VS reactive dyes. The VS dyes have small value of entropy were formed dimer. It was confirmed that no dimer form for m-substituted VS dyes. There were similarities among various reactions including homo- and mixed dimerization.

• Textile Coloration and Finishing
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• v.5 no.3
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• pp.216-220
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• 1993

Dissociation constants and heat of dissociation of dimers of 3, 3'-diethyl-thiacarbocyanine dye(Dye 2) have been studied. At $10~40^{\circ}C$, absorption spectra of 2 vol% aqueous ethanol solutions of Dye 2 showed monomer and dimer bands. From the temperature dependence of monomer absorbance, dissociation constants K and ${\Delta}H$ were estimated to be $6.2(10^{\circ}C)-10.6(40^{\circ}C)mon/\ell$ and 3kcal/mol, respectively. These K valus are about one half of those for 3,3'-diethyl-2,2'-cyanine dye with one methine carbon, indication a higher dimer stability than that of 3,3-diethyl-2,2'-cyanine dye.

• Textile Coloration and Finishing
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• v.3 no.2
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• pp.1-9
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• 1991

In order to improve the shrink resistance of wool, the fabric was treated with D.C.C.A.(Di-chloro Isocyanuric Acid) and Hercosett. The results obtained as follows, 1. The optimum condition for the shrink resistance of wool fabric was Hercosett concentration of about 2.0~2.5%(o.w.f), pH of 7, the curing temperature of about $140^{\circ}C$, and curing time of 3 minutes. 2. The physical properties with the experimental conditions, such as the tensile strength, bending strengh, crease recovery, tearing strengh were confirmed by measurements.

• Textile Coloration and Finishing
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• v.19 no.1 s.92
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• pp.45-52
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• 2007

Polyacrylonitrile(PAN) fiber was treated with low-temperature plasmas of argon and oxygen for surface modification, and its surface chemical structure and morphology were examined by a field emission scanning electron microscope(FESEM) and a Fourier-transform infrared microspectroscopy(IMS). The argon-plasma treatment caused the only mechanical effect by sputtering of ion bombardment, whereas the oxygen plasma brought about a chemical effect on the PAN fiber surface. The experimental evidences strongly suggested that cyclization of nitrile group and crosslinking were likely to occur in the oxygen-plasma treatment. On the other hand, with the argon-plasma treatment, numerous my pits resulted in ranging from several tens to hundreds nanometers in radius. The plasma sensitivity of functional groups such as C-H, $C{\equiv}N$, and O-C=O groups in the PAN fiber was dependent on their chemical nature of bonding in the oxygen-plasma, in which the ester group was the most sensitive to the plasma. Vacuum-ultraviolet(VUV) radiation emitted during plasma treatment played no substantial role to alter the surface morphology.

• Textile Coloration and Finishing
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• v.4 no.3
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• pp.131-135
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• 1992

Quaternary aminized cellulosic adsorbents (C $A_{QA}$ ) which exhibit adsorption capacities for anionic dyestuffs for the treatment of colored waste water and re-use of the treated water were studied. The isotherms and thermodynamic parameters of C.I. Acid Orange 7, solution considered as a model of negatively charged coloring matters for C $A_{QA}$ , were determined. Batch method and flow method were employed to determine decoloring capacity of cellulosic adsorbents for Orange 7. The cellulosic adsorbents exhibited much better adsorption capacity than activated carbon. Furthermore the exhausted cellulosic adsorbents could be readily regenerated by washing with dilute sodium hydroxide.

• Textile Coloration and Finishing
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• v.5 no.2
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• pp.109-116
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• 1993

Synthesis and liquid-crystallinites of thermotropic polyamides and copolyamides were investigated. Thermotropic polyamides and copolyamides containing a flexible spacer in the backbone were obtained by the two or three components melt polycondensations of 4,4'-dicarboxy-${\alpha}$${\omega}$-diphenoxy alkane as an A components, 4,4'-diacetoamido-3,3' dimethoxybiphenyl as a B, 1,4-diacetoamido-benzene (diacetylated p-phenylenediamine) was used as another amide-group-forming minomer. The content of the amide groups in the thermotropic polyamide and Copolyamide widely varied depending on the structure of the amide-group forming diacetoamido monomers. A polymer (9CLDI) showed a typical nematic texture between 218$^{circle}C$ ($T_m$) and 345$^{circle}C$($T_i$) The melting points of the members of this series of polymers increased with decreasing methylene spacer. The polymer structure and mesmorphic nature were examined by solid and solution ${^13}C$-NMR spectroscopy, cross polarizing microscopy with a hot stage.

• Textile Coloration and Finishing
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• v.16 no.1
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• pp.1-4
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• 2004

This research surveys the twisting and untwisting tensions according to the various processing conditions of belt type texturing such as draw ratio, 1st heater temperature and velocity ratio. The 1st heater temperature was changed from 1606{\circ}C\; to\; 220^{\circ}C$, draw ratio was changed from 1.6 to 1.9 and velocity ratio was changed from 1.4 to 1.8. The twisting and untwisting tensions are measured with the variation of these processing conditions, in addition, the untwisting tension(T2) and tension ratio(T2/Tl) according to the various processing conditions are analysed with the false twist mechanism which is affected to the physical properties of draw textured yams.

• Textile Coloration and Finishing
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• v.9 no.5
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• pp.75-81
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• 1997

o-Aminobenzene sulfone-N-ethylanilide, the diazo component of C.I. Acid Red 57, is currently being diazotised by the use of nitrosylsulphuric acid because of its high molecular weight and weak basicity. However, this method has many problems such as complicated manufacturing process and discharge of large volume of strong acidic effluent. In this study, the possibility of replacing nitrosylsulphuric acid method by direct method, which is simpler and produces less effluent, has been checked and the optimum process condition was studied. The effect of HCl concentration, the amount of sodium nitrite and particle size of diazo component on diazotisation yield was investigated. The optimum pH condition for coupling reaction was also evaluated.

• Textile Coloration and Finishing
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• v.25 no.3
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• pp.215-222
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• 2013

The purpose of this study is to minimize fading fabrics of surgical gown by repeated severe laundering and sterilization condition. The study showed that the best conditions were reduction cleaning using sulphinic acid derivatives or glucose organic chemicals at $98^{\circ}C$ alkaline solutions. In these conditions, color difference values(dE) were below 1.0 that means unrecognizable color change by repeated laundering and sterilization. If it treated with only laundering, reduction cleaning conditions may adjust over $80^{\circ}C$ alkaline solution. In conclusion, it is needed to select the high-washing fastness dye and reduction cleaning using sulphinic acid derivatives or glucose organic chemicals at $98^{\circ}C$ alkaline solutions for removal unfixed dyes.