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

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2015, Vol.27, No.1

  • 1.

    Hydrolytic Behavior of Vinylsulfonyl Reactive Dyes - Easiness of Dimerization -

    Kim In-Hoe | 2015, 27(1) | pp.1~10 | number of Cited : 0
    Abstract PDF
    The aim of the current study is to identify the dimerization and decomposition kinetics of the F-DM type. The regeneration of F-VS from FiFj-DM or the reversibility of the dimerizations were investigated. The order of real rateconstants of the dimerization(′ Dij) would seem to be similar to that of rate constants of a dimerization( Dij) for VS dyesat a given pH because of the constancy of the equilibrium constants( aj-value). The reverse reactions of the DM typesare appeared to occur in two steps, the deprotonation of α-carbon of the DM types and disproportionation. The ratio ofthe decomposition of the DM type to F-Hy and F-VS appears to be related with the ratio of i/ j. Similarities werealso found among various other reactions, including homo- and mixed dimerization. VS dyes undergoing fast hydrolysishave difficulty in forming a dimer. The higher the reactivity with cellulose or hydroxide ion, the smaller thedimerization. The easiness of the dimerization was thus found to be inversely proportional to the rate of hydrolysis.
  • 2.

    Property Evaluation of Epoxy Resin based Aramid and Carbon Fiber Composite Materials

    서대경 | Jin-Seok Bae | 하나라 and 2other persons | 2015, 27(1) | pp.11~17 | number of Cited : 9
    Abstract PDF
    Recently, super fiber reinforced composite materials are widely used in many industries due to high mechanicalproperties. In this study, 2 different types of composite materials were manufactured in order to compare their mechanicalproperties. Carbon and Aramid fibers were used for reinforcement materials and Bisphenol-A type epoxy resin was formatrix. Two kinds of fiber-reinforced materials were manufactured by RIM(Resin Injection Molding) method. Beforemanufacturing composite materials, the optimal manufacturing and curing process condition were established and the ratioof reinforcement to epoxy resin was discussed. FT-IR analysis was conducted to clarify the structure of epoxy resin. Thermaland mechanical property test were also carried out. The cross-section of composite materials was observed using a scanningelectron microscope(SEM).
  • 3.

    Surface Modification Effect and Mechanical Property of Para-aramid Fiber by Low-temperature Plasma Treatment

    박성민 | 손현식 | SIM JEE HYUN and 3other persons | 2015, 27(1) | pp.18~26 | number of Cited : 1
    Abstract PDF
    Para-aramid fibers were treated by atmosphere air plasma to improve the interfacial adhesion. The wettability ofplasma-treated aramid fiber was observed by means of dynamic contact angle surface free energy measurement. Surfaceroughness were investigated with the help of scanning electron microscopy and atomic force microscopy. The tensile test ofaramid fiber roving was carried out to determine the effect of plasma surface treatments on the mechanical properties of thefibers. A pull-out force test was carried out to observe the interfacial adhesion effect with matrix material. It was found thatsurface modification and a chemical component ratio of the aramid fibers improved wettability and adhesion characterization. After oxygen plasma, it was indicated that modified the surface roughness of aramid fiber increased mechanical interlockingbetween the fiber surface and vinylester resin. Consequently the oxygen plasma treatment is able to improve fiber-matrixadhesion through excited functional group and etching effect on fiber surface.
  • 4.

    Synthesis of Super Hydrophobic Disazo Red Dyes Using Alkylanilines as Diazo Components

    Taekyeong Kim | 류명화 | 장영재 | 2015, 27(1) | pp.27~34 | number of Cited : 4
    Abstract PDF
    Novel super hydrophobic disazo red dyes were synthesized to improve light fastness of the primary monoazo reddye of previous study on polyolefin fibers such as polypropylene and ultra high molecular weight polyethylene fibers. 4-Alkylanilines were diazotized and then coupled to 2,5-dimethylaniline to produce dye intermediates which were then furtherused to synthesize final disazo red dyes by diazoization and coupling to β-naphthol. Considering both affinity of the dyestoward both polyolefin fibers and color fastnesses, the decyl-substituted dye was determined as the optimum dye. Thedecyl-substituted disazo red dye exhibited good dyeabiity on both polyolefin fibes and almost the same color values as theprevious primary monoazo red dye. Light fastness on ultra high molecular weight polyethylene fibers was improved up to rating3~4 compared to rating 2~3 of the previous primary monoazo red dye.
  • 5.

    Study on Manufacturing Technology of Coating Yarns for Awning Fabrics

    Seung-Jin Kim | 이은호 | 허경 and 1other persons | 2015, 27(1) | pp.35~49 | number of Cited : 1
    Abstract PDF
    This paper investigated optimum process conditions of coating yarn for awning fabric. For this purpose, thesimulation for processability and yarn quality using SPSS statistics package was carried out, and PP/TPO and PET/PVC coatingyarns specimens were made with variation of extruder temperature and feed speed of core yarn on the yarn coating machinefor examining simulation result. It was revealed that optimum coating conditions of PP/TPO 1000d coating yarn were extrudertemperature 150℃, and core yarn feed speed 400~500m/min. Mechanical property and thermal shrinkage of PP/TPO coatingyarn made at this conditions were best and core evenness rates of these coating yarns by yarn compression tester were alsosuperior, which was certified by SEM photograph. In addition, these experimental results were coincided with simulationresults. It was found that, in PET/PVC coating yarn, yarn physical properties between 1500d and 1200d coated yarns werenot shown any difference, and core evenness rates of these coating yarns were superior. It revealed and concluded that thesesimulated coating conditions are applicable to production field.
  • 6.

    Deodorization of Non-woven Fabrics Bonded with Activated Carbon

    Dong Seok Jeong | 천태일 | 2015, 27(1) | pp.50~61 | number of Cited : 0
    Abstract PDF
    The merits of activated carbon for removal of organic compounds have been well known in the variousindustrial fields. Fixing methods with activated carbon in the non-woven fabric have the advantages of fast adsorption andease of handling when compared with bonding and coating methods. In this study, we have examined deodorization ofnon-woven fabrics fixed with activated carbon. We have been tested the deodorization of various kinds activated carbonand non-woven fabric structures. The effective mixing ratio of activated carbon was 5% on the weight of fabrics, whichare closely related to the fabric structure. The activated carbon with higher mesh size show the better deodorization effect.
  • 7.

    Color Stability of the Bioplastic containing Sorghum Extract Chelated by Fe(Ⅱ) and Cu(Ⅱ)

    이가현 | Sung Jun Lee | Sang Won Jeong and 5other persons | 2015, 27(1) | pp.62~69 | number of Cited : 0
    Abstract PDF
    To improve the color stability of the bioplastic containing sorghum extract, sorghum extract was chelated by ametal ion. The chelating activity was quantitatively evaluated under the various conditions. Chelation of sorghum extract byCu(II) was determined by reaction with pyrocatechol violet, whereas Fe(II) chelation was investigated by forming complexeswith ferrozine. Chelation of sorghum extract was increased rapidly with increasing concentrations of metal salt and sorghumextract. At a 0.1g/L metal salt addition level, the chelating activity of Fe(II) and Cu(II) were 66.7% and 54.2%, respectively. According to the chelation pH conditions, the sorghum extract was chelated almost 100% by Fe(II) above the pH 6.5. It wasconfirmed that Fe(II) was a strong chelator of sorghum extract than Cu(II). The sorghum extract chelated with metal salt exhibithigher thermal stability. The bioplastic containing chelated sorghum extract showed relatively less color change than the control.
  • 8.

    Preparation and Characterization of High Absorptive Cellulose Film Derived from Styela Clava Tunic for Wound Dressing

    Keum-Yong Seong | 고은경 | 이승현 and 5other persons | 2015, 27(1) | pp.70~79 | number of Cited : 5
    Abstract PDF
    To establish the optimal conditions for the manufacture of high absortive cellulose film(CF) originated fromStyela clava tunic(SCT), the physicochemical properties included absorption was measured in CFs prepared under the variousconditions. The highest absorption was observed for SCT-CF20 prepared from the cellulose solution dissolved at 80°C for20 min, although the filtration treatment did not induce any significance alteration. Also, the absorption was higher inSCT-CF20-F prepared by the freeze drying than SCT-CF20-N (ambient air drying) and SCT-CF20-H (heat drying). Theaddition of porogen (NaHCO3) induced an increase of absorption in SCT-CF20-PF relative to SCT-CF20-F, while thenumber of interconnected porous structures was enhanced in SCT-CF20-PF. Furthermore, a high level of SK-MEL-2 cellsviability was observed in SCT-CF20-PN and SCT-CF20-PF cultured group. These results show that SCT-CF may havehigh absorption and biocompatibility when prepared from SCT cellulose solution dissolved at 80°C for 20 min after additionof porogen and then subjected to freeze drying.
  • 9.

    Combination Dyeing of Silk Fabrics with Extracts from Humulus japonicus and the Pruned Branches of Prunus persica Tree

    하영갑 | Jeong Sook Lee | 2015, 27(1) | pp.80~95 | number of Cited : 3
    Abstract PDF
    In this study, the properties such as color, dye uptake and antibacterial function were examined through theapplication of combination dyeing and mixed dyeing with extracts from Humulus japonicus (hwansam) and pruned branchesof prunus persica(peach) tree. In terms of dye uptake and surface color changes subject to the kind of mordants, methodsand mixing ratio of dye, it was found that fabrics dyed by the pre-mordanting method with CuSO4 showed thered·green·yellow group colors, which were not seen in fabrics dyed with hwansam only. Color fastness was found strongat grade 4-5 with 96.3% of UV protection ratio. While the fastness to light was as fair as grade 3, it showed an excellentresult of 99.9% bacteria reduction rate against Staphylococcus aureus with fair 58% deodorization rate and 21.2%antibacterial rate against Klebsiella pneumoniae. As stated above, the combination and mixed dyeing resulted in themeaningful outcomes with regard to color variations, dye uptake, color fastness and functional properties.
  • 10.

    Dyeing of Cotton Fabrics Using Zizania latifolia Turcz. Extracts

    Hyesun Lee | 2015, 27(1) | pp.96~104 | number of Cited : 3
    Abstract PDF
    This study examined the pretreatment effect, appropriate dyeing conditions, color fastness and functionality ofcotton fabrics dyed with Zizania latifolia Turcz. Dye uptake was substantially increased by pretreatment and chitosanpretreatment was much more effective than tannic acid pretreatment. Optimal dyeing conditions were colorant concentrationof 100%, dyeing temperature of 100℃, dyeing time of 80 minutes and dyebath pH of 5.5. Color fastness of chitosanpretreatment and dyed cotton to washing, rubbing, perspiration and light was 4, 5, 3-4(acidic), 3(alkaline) and 3 respectively. Color fastness of tannic acid pretreatment and dyed cotton to washing, rubbing, perspiration and light was 4, 5, 3-4(acidic),4-5(alkaline) and 4 respectively. Deodorization rates of ammonia(NH3) were 99.9% in both cases. UV protection rate were98.3% of UV-A and 98.5% of UV-B in case of chitosan pretreatment. UV protection rate were 98.2% of UV-A and 98.5%of UV-B in case of tannic acid pretreatment. UV protection factor(UPF) was 50+ in both cases. Reduction rate of Staphyloccusaureus were 99.9% in both cases. Therefore Zizania latifolia Turcz. could be used a new functional colorant.