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pISSN : 1229-0033 / eISSN : 2234-036X

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2003, Vol.15, No.2

  • 1.

    Dyeability of Poly(trimethylene terephthalate) Fibers Annealed by Passing on the Plate Heater

    Seong Hag Hong | ChoiChangNam | Hee Choi and 2other persons | 2003, 15(2) | pp.1~9 | number of Cited : 0
    Abstract PDF
    PTT[poly(trimethylene terephthalate)] fiber was annealed by passing on the plate heater to illuminate the effects of annealing on the mechanical properties and dyeability with varying the treatment temperature for 0.5 second. The apparent crystal sizes and crystallinity were increased with increases in temperature. With the increases of the temperature, the dynamic viscoelastic behaviors were analyzed to be reduction in Tmax(tanδ). The initial modulus were observed to be a small enhanced. The shrinkage in hot water were reduced. The dyeability for disperse dye enhanced dramatically, for example, a satisfactory degree of exhaustion was obtained by dyeing at 95℃ for 30 min with the PTT fibers heat treated at 180℃.
  • 2.

    Preparation and Permeation Characteristics of Finely Porous Ultrafiltration Membranes by Phase Inversion Method

    Youngki Hong | Kieseo Bae | 2003, 15(2) | pp.10~17 | number of Cited : 0
    Abstract PDF
    In this work, ultrafiltration(UF) membranes were prepared using polyethersulfone(PES). The polymer was dissolved in various solvent, such as N,N-dimethyl formamide(DMF), N,-dimethyl acetamide (DMAc), N,N-dimethyl sulfoxide(DMSO) and N-methyl-2- pyrrolidone(NMP). Each polymer solution was casted on the glass plate, and immersed into non-solvent bath. In this way finely porous UF membranes were prepared by phase inversion method.The cross sectional structure of PES membrane was asymmetric which was consist of sponge-like sublayer, finger-like toplayer, and active skin layer. From the solute rejection experiments, the molecular weight cut off of the prepared membrane in various solvent was evaluated 10,000 for DMF, 30,000 for DMAc, 50,000 for DMSO, and 10,000 for NMP respectively.
  • 3.

    A Study on Stabilization and Mechanical Properties of Polyacrylonitrile-based Fiber with Itaconic acid

    신익기 | Lee Shin hee | Park,Soo-Min | 2003, 15(2) | pp.18~27 | number of Cited : 0
    Abstract PDF
    In this study, a continuous stabilization process is used to make high-performance carbon fiber from polyacrylonitrile(PAN)-based fibers. The effect of oxygen content of PAN-based fibers on the stabilization process and the properties of the resultant carbon fibers is investigated. In order to research the progress of stabilization reaction, FT-IR, elemental analysis, density, DSC, etc are used.Stabilization is carried out in air atmosphere from the 200 to 300℃ temperature range.An increase of PAN-based fibers diameter reduces the oxygen content during the continuous stabilization process. A higher oxygen content increase the density, tensile strength and modulus in the resultant carbon fibers.The most appropriate oxygen content in the stabilized fiber should be about 12%. Fibers having more than 12% oxygen content yield carbon fibers with inferior properties. Those carbon fibers also have sufficient commercial availability.
  • 4.

    The Investigation on Color Change of Dis-azo Acid Dye in Wool Dyeing

    김미경 | 김태경 | 윤석한 and 1other persons | 2003, 15(2) | pp.28~34 | number of Cited : 1
    Abstract PDF
    It is already known that the color of wool fabric dyed with disazo acid dyes could be changed in dyeing process and this is accelerated under alkaline condition. Focus was given to figuring out the mechanism of this color change, through the LC-MS analysis.In this study, no color change was seen in wool fabrics dyed with C. I. Acid Blue 113 under weak acidic, neutral and weak alkaline conditions for 1hour. However, the wool fabrics dyed under weak alkaline condition for a long time over 3 hours turned reddish orange.When the wool fabrics dyed under weak acidic, neutral and weak alkaline conditions were treated with 0.5g/L Na2CO3 solution, all of them turned reddish orange. On the other hand, the color of silk fabrics dyed with C. I. Acid Blue 113 were not changed after the same alkaline treatment.Wool contains cystine and cysteine, whereas silk does not. Due to the reversible reduction/oxidation process of cystine and cysteine in wool dyeing, the C. I. Acid Blue 113 of the dis-azo type is decomposed by reduction and consequently turned them into the reddish orange mono-azo types dye.
  • 5.

    A Study on Dyeing Ability of Aramid(Nomex) Spun Yarn in Supercritical Carbon Dioxide using Disperse dyes

    용광중 | 박영환 | 김한석 and 3other persons | 2003, 15(2) | pp.35~43 | number of Cited : 1
    Abstract PDF
    To acquire dyeing ability on aramid(Nomex) spun yarn in supercritical fluid dyeing, supercritical fluid dying(SFD) machine of 3L scale was designed. C.I. Disperse Red 60 and Red 360 were used in this work. It was possible to increase dyeing ability and to get level dyeing of fiber by attaching assistance devices(controlling device of supercritical fluid, nozzle, cover of carrier, etc.) to SFD machine. Physical properties(tensile strength, elongation, shrinkage) of Nomex spun yarn treated by SFD were not changed. K/S values of dyed Nomex spun yarn with Red 360 were higher than that with Red 60 and color fastness of dyed Nomex spun yarn by SFD was similar to that by conventional dyeing method.
  • 6.

    Electron Beam -Induced Graft Polymerization of Acrylic Aicd on Polypropylene Nonwoven Fabrics(I)-

    김홍제 | N.I.Shtanko | Lim,Yong-Jin and 1other persons | 2003, 15(2) | pp.44~50 | number of Cited : 2
    Abstract PDF
    Before studying graft polymerization of PP(polypropylene) nonwoven fabrics by electron beam preirradiation method, mechanical properties, thermal properties and degree of crystallinity of original and electron beam irradiated PP nonwoven fabrics were investigated.Morphological surface changes of electron beam irradiated PP nonwoven fabrics were not observed. And the melting temperature and crystallinity of electron beam irradiated PP nonwoven fabrics also did not change as compared with untreated PP nonwoven fabrics. But the breaking strength of electron beam irradiated PP nonwoven fabrics decreased with increasing electron beam absorbed dose due to breakdown of some parts of polymer main chain.
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