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

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2010, Vol.22, No.3

  • 1.

    Thermo- and Acid/base-induced Spectral Switching of a Poly(N-isopropylacrylamide) Copolymer Containing Benzopyran-based D-π-A type Dye Units

    KIM SUNG HOON | Byung Chul Ji | 이은미 and 1other persons | 2010, 22(3) | pp.181~186 | number of Cited : 2
    Abstract PDF
    Abstract― A thermoresponsive poly(NIPAM-co-dye) labeled with benzopyran-based D-π-A type dye was prepared by typical radical copolymerization. It can be also constructed a acid/base-induced molecular switch by modulation of intramolecular charge transfer with protonation/deprotonation. The lower critical solution temperature behavior was investigated by means of UV-vis spectroscopy which allows the measurement of the phase transition from 25°C to 45°C in aqueous DMSO solution. The morphology of the internal microstructure of the poly(NIPAM-co-dye) hydrogel was observed by scanning electron microscopy. The reversible switch could be obtained by thermal and acid/base stimuli.
  • 2.

    Rheological Measurement of Fiber Spinnability of PVA Solution Dopes in DMSO

    Dong Wook Chae | 2010, 22(3) | pp.187~193 | number of Cited : 0
    Abstract PDF
    Abstract― The effects of molecular weight (MW) and concentration on the rheological properties of poly(vinyl alcohol)(PVA) solutions in dimethyl sulfoxide (DMSO) were investigated at 30 oC. Ubbelohde viscometer and rotational rheometer were employed for dilute and concentrated regime, respectively. In the dilute regime, the Mark-Houwink exponent (α) of the solutions determined from three different MWs proved 0.73. The critical concentration (C*), in which the entanglement and overlap of polymer molecules began to take place, decreased with increasing the MW of PVA. Huggins constant (KH) values ranged from 0.33 to 0.45 over the MW examined. In the log-log plot of ηsp versus [η]C, the PVA with higher degree of polymerization (DP) gave a greater slope exhibiting the inflection point in the vicinity of C*. In the dynamic viscosity (η')curve, the PVA solutions of DP 1700 presented Newtonian fluid behavior over most of the frequency range examined. However, the lower Newtonian flow region reduced with increasing the DP. As the PVA concentration increased, η' was increased and the onset shear rate for pseudoplasticity was decreased. In the Cole-Cole plot, PVA solutions showed almost a single master curve in a slope of ca. 1.65 regardless of the DP. However, the increase of the concentration from 8 to 12 wt%for PVA solutions of DP 5000 decreased the slope from 1.73 to 1.57. In the tan δ curve, the onset frequency for sol-gel transition was shifted from 154 to 92 rad/s with increasing the DP from 3300 to 5000 and from 192 to 46 rad/s with increasing the concentration from 8 to 12 wt%. In addition, longer relaxation time (λ) was observed with increasing the DP and concentration.
  • 3.

    Dyeing Properties and Color Characteristics of Silk Fabrics Dyed with Prunus yedoensis Matsumura Flower Extract

    YI EUNJOU | Eun-Sook Yoo | Chunghun Han and 1other persons | 2010, 22(3) | pp.194~206 | number of Cited : 8
    Abstract PDF
    Abstract― This study was carried out to identify the optimum dyeing conditions for maximum dye uptake of Prunus yedoensis Matsumura flower extract on silk fabric and to investigate hue/tone characteristics and fastness properties of the dyed fabrics. As results, the flower extract was found to contain flavonoids by FT-IR and to show yellowish shade by UV-vis spectrum. Silk fabric was optimized for maximum dye uptake to five repetitions of dyeing at 80℃ for 60 min with an extract concentration of 600% owf in terms of both K/S and color differences. Pre-mordanting was more effective to dye uptake than post-mordanting for all of the mordants used. Un-mordanted and pre-mordanted fabric showed YR(Yellow Red) while most of post-mordanted ones did Y(Yellow). Main tones of dyed fabrics were sf(soft) and lt(light) in the case of unmordanting or Al-mordanting whereas they were d(dull) and g(grayish) by post-mordanting with Cu, Cr, and Fe, respectively. The fastness grades to rub and dry cleaning were reasonably good for most dyeing conditions while those to light were poor. Finally dyeing condition for each hue/tone of the dyed silk with the flower extract was optimized considering fastness properties.
  • 4.

    Natural Dyeing of Sangju Silk with Mulberry Extract Solution

    이광우 | Jun-Hee Lee | Su-Jang Eum and 3other persons | 2010, 22(3) | pp.207~213 | number of Cited : 12
    Abstract PDF
    Abstract― Natural dyeing of Sangju silk for graveclothes with mulberry extract solution was studied. The anthocyanidin dye in the extracted mulberry solution was markedly influenced by pH condition, which resulted in the changed maximum light absorption from a λmax of 525nm in acidic condition to 380nm in alkaline condition possibly due to the irreversible transformation of anthocyanidin to cyanidin form of the dye. The color fastness properties to both light and washing were good when the fabrics were dyed at 80oC with the mulberry-extracted solution upto twice extraction.
  • 5.

    Octadecane Fixation via Photocrosslinking of Polyethylene Film

    Jinho Jang | Deuk-Won Yun | 2010, 22(3) | pp.214~219 | number of Cited : 1
    Abstract PDF
    Abstract― Polyethylene(PE) films were photocrosslinked by continuous UV irradiation. Benzophenone addition as low as 1wt%into the PE film increased the gel fraction up to 96%. The photocrosslinking was attributed to the recombination of PE radicals generated upon UV irradiation, which was enhanced by the hydrogen abstraction of the added benzophenone. Also the crossliked PE showed higher thermal stability and decreased crystallinity with increasing UV energy as shown by TGA, XRD and DSC analysis. It was also possible to fix 5.4% octadecane into PE by the photocrosslinking. The crosslinked PE film containing octadecane showed lower tensile strength and modulus coupled with higher extension compared to that without octadecane, which can be used as a new plasticizing method for the crosslinked PE film.
  • 6.

    Effect of Sodium Sulfate on Ramie Fabrics Treated with Pectinase

    Kim,In-Young | SONG WHA SOON | So Young Park | 2010, 22(3) | pp.220~228 | number of Cited : 2
    Abstract PDF
    Abstract― This study examines the scouring effect of pectinase on ramie fabric and influence of sodium sulfate as an activator for pectinase. The scouring effects were measured by the weight loss and pectin contents. SEM, weight loss, stiffness, moisture regain and dye ability of ramie fabric teated with pectinase/sodium sulfate were also measured. When ramie fabrics were desized with α-amylase, the optimum conditions were pH 6.5 at 60°C for 80 min with 1%(o.w.f) ⍺-amylase concentration. When ramie fabrics were scoured with pectinase, the optimum conditions were pH 8.5 at 55°C for 30 min with 10%(o.w.f) pectinase concentration. Addition of sodium sulfate improved enzyme activity significantly, which increased proportionally with increasing sodium sulfate concentration. When 50 g/l of sodium sulfate was added, the surafce became cleaner compared to the enzyme treatment without salt: weight and tensile loss, moisture regain and dyeability of the treated fabrics increased, while pectin contents and stiffness decreased. Therfore, sodium sulfate was effective activator for the pectinase treatment of flax fiber.
  • 7.

    Morphological Properties of Poly(ε-caprolactone) Nano/Microcapsules Prepared by Emulsion-diffusion Method

    김혜인 | Park,Soo-Min | Cheon-Hee Jeong | 2010, 22(3) | pp.229~238 | number of Cited : 1
    Abstract PDF
    Abstract― Poly(ε-caprolactone) nano/microcapsules(nmcPCL) containing phytoncide oil were synthesized by emulsion diffusion method using ethyl acetate and poly(vinyl alcohol) (PVA) as an organic solvent and an emulsion stabilizer respectively. The influence of the degree of saponofication of the PVA and the weight ratio of core to wall materials was investigated to design nanocapsules in terms of particle size, morphology, and emulsion stability. The encapsulated nmcPCL were characterized by FT-IR spectrometry, particle size analyzer and scanning electron microscope. Mean size of nanocapsules prepared with PVA with a degree of saponofication of 87% was smaller than those of PVA with a degree of saponofication of 98.5% and the mean particle size of the capsules decreased with increasing core/shell ratio.
  • 8.

    Breathable Waterproof Finish of PET Fabrics via Microporous UV Coating of Polyurethane Diacrylate

    Jinho Jang | 구광회 | 2010, 22(3) | pp.239~245 | number of Cited : 5
    Abstract PDF
    Abstract― Breathable waterproof PET fabrics were prepared by the UV coating of UV-curable polyurethaneacrylate(PUA)formulation mixed with polyethyleneglycol(PEG) as a water soluble pore former. The dispersed PEG in the UV-cured coating was extracted by warm water, which can generate individual circular pores uniformly distributed all over the coating instead of pore channels. Accordingly the moisture permeability of the microporously coated fabrics increased substantially with increasing PEG addition without significant reduction of hydrostatic pressure. Also the silicone diacrylate addition in the formulation was beneficial in increasing the hydrostatic pressure. The UV-based microporous coating can be an alternative to conventional thermal curing of solventborne polyurethane coating owing to the enhanced environment friendliness and energy saving.
  • 9.

    The Physical Property of MWNT/PU Composite Films

    Seung-Jin Kim | Jeong Hyun Kim | Jun Hyeong Park | 2010, 22(3) | pp.246~256 | number of Cited : 4
    Abstract PDF
    Abstract― This study studies on the physical property of MWNT/PU composite film for electrostatic dissipation (ESD) function by dispersing multi-wall carbon nanotubes (MWNT) in dimethylformamide (DMF) and by combining it with polyurethane(PU). For this purpose, four kinds of MWNT were selected and the composite films were made by dispersion processing, and their physical properties were measured and investigated in terms of electrical conductivity. For dispersion parameters, four MWNT contents(0.5,1, 2, 5wt%) and two dispersion times(30min, 120min) were selected. The dispersion property and the electrical conductivity of MWNT/PU film was measured using a UV-Vis spectrometer and conductivity measuring apparatus. Finally, their physical properties according to the dispersion conditions were analyzed and discussed with various processing conditions.
  • 10.

    A Study on Oil Absorption Rate and Oil Absorbency of Melt-blown Nonwoven

    SHIN HYUN SAE | 유주환 | 김로 | 2010, 22(3) | pp.257~263 | number of Cited : 4
    Abstract PDF
    Abstract― Oil-absorbable nonwovens were produced by meltblown processing of polypropylene chips. In this study, experimental array and variance analysis of the design of experiment were used to increase the field repeatability and universality. Oil absorbency was decreased, as oil absorbable nonwovens of packing density and gearpump speed were increased. Oil absorption rate was increased,as packing density was increased. Also the oil absorption rate increased with increasing gear-pump speed.
  • 11.

    Performance Evaluation of Absorbing and Fast-Drying Fabric according to Washing

    Young-Seok Koo | Ji-Young Shin | 2010, 22(3) | pp.264~271 | number of Cited : 1
    Abstract PDF
    Abstract― The purpose of this study was to investigate performance evaluation of absorbing and fast-drying fabric after washing. In the comparison of absorption and fast-drying properties, there was slight difference among the materials depending on thickness,weight, and fabric structure. Absorption speed of the materials depended on the frequency of washing which might be caused by modification of fabric structure or composition fiber due to friction during washing. The ability of fast-drying of the materials was gradually decreased with the increase of washing frequency, which might be caused by fatigue accumulation on inner fiber and structural change or destruction with friction during washing.
  • 12.

    The Effects of Draw Ratio of Worsted Yarn on the Mechanical Properties of Knitted Fabrics

    Seung-Jin Kim | 한원희 | 2010, 22(3) | pp.272~281 | number of Cited : 3
    Abstract PDF
    Abstract― This paper surveys the effects of drawing conditions of the worsted staple yarns on the mechanical properties of the knitted fabrics for highly aesthetical fabrics. The drawn worsted yarns were made on the yarn drawing system with various draw ratios under the fixed conditions of setting time, reduction and oxidation. The knitted fabric specimens were prepared on the 16gauge circular knitting machine using these drawn worsted staple yarns. The tensile, shear, bending, compression and surface properties of these knitted fabrics were measured by KES-FB-AUTO-A system and also discussed with the drawing conditions. The tensile linearity, shear stiffness and bending rigidity decreased with increasing draw ratio. Any changes were not shown on the compressional properties with drawing conditions. But the friction coefficient of the knitted fabric on the course direction increased with increasing draw ratio, while there was no change according to the draw ratio on the wale direction.
  • 13.

    Effects on Printing Quality according to Yarn Twist and Knitting Structure of Media in Digital Textile Printing(I)

    Soon Young Park | JEONDONGWON | 박윤철 and 1other persons | 2010, 22(3) | pp.282~291 | number of Cited : 5
    Abstract PDF
    Abstract― Digital textile printing(DTP) is becoming more important because the production trend of textile printing goods is adapting to small-lot multiple items. Recently enhanced use of DTP is closely connected with production of high value-added products in fashion industry, which is also appropriate for quick response system(QRS). Quality of DTP depends on pre-treatment,after-treatment, ink, media, printer, etc. One of these parameters, Selection of good media is very important to obtain high quality of DTP products. Especially, the effects of media on printing quality of DTP according to yarn twist and structure of knitting fabric were examined in this study. Two types of yarn twist of 830 t.p.m and 1630 t.p.m for cotton knit were used and five types of media structures were knitted with single circular knitting machine. First, MIU, MMD, SMD's values are closely related with surface roughness of sample as well as printing quality. The hard twist samples were higher values than normal twist samples in the same media structure. In case of SMD, the values increased from plain to corduroy types. Second, aspect of line sharpness, line area, and line width values of hard twist samples decreased from plain to corduroy than those of normal twist samples. Third, line deviation values of hard twist samples, blurriness of line, also decreased than those of normal twist samples.