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

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2018, Vol.30, No.2

  • 1.

    Fluorescence-Quenched Sensor for Trinitophenol in Aqueous Solution Based on Sulfur Doped Graphitic Carbon Nitride

    Kyeong Su Min | Young-A Son | Ramalingam Manivannan and 1other persons | 2018, 30(2) | pp.63~69 | number of Cited : 0
    Abstract PDF
    In this study, we report on successful attempt towards the synthesis of sulfur self-doped g-C3N4 by directly heating thiourea in air. The synthesized materials were characterized using UV-vis spectral technique, FT-IR, XRD and TEM analysis. Further, the obtained material shows an excellent detection of carcinogenic TNP(Tri nitro phenol) in the presence of 10-fold excess of various other common interferences. The strong inner filter effect and molecular interactions(electrostatic, π-π, and hydrogen bonding interactions) between TNP and the S-g-C3N4 Nano sheets led to the fluorescence quenching of the Sg- C3N4 Nano sheets with an excellent selectivity and sensitivity towards TNP compared to that of other nitro aromatics under optimal conditions and the detection limit calculated was found to be 6.324 nM for TNP. The synthesized nanocomposite provides a promising platform for the development of sensors with improved reproducibility and stability for ultra-sensitive and selective sensing of TNP.
  • 2.

    The Dyeing Behavior of PET Bulky Yarn with Disperse Dyes

    Bum Hoon Lee | 2018, 30(2) | pp.70~76 | number of Cited : 3
    Abstract PDF
    The dyeing behaviors of poly(ethylene terephthalate)(PET) bulky yarns, DTY(draw textured yarn) and SSY(latent crimped yarn), were investigated with different energy type disperse dyes compared with those of SDY(spin draw yarn). The maximum exhaustions of E-type disperse Red 60, Blue 56 and Yellow 54 on SSY were 99%, 94% and 93%, respectively. The maximum exhaustions of S-type disperse Red 179, Blue 79 and Orange 30 on SSY were 96%, 97% and 97%, respectively. The K/S values of SSY were significantly higher than those of DTY and SDY in all energy type of disperse dyes. The knit fabric composed of SSY became bulky at the end of high temperature dyeing process because of their thermal shrinkage property due to melt viscosity difference.
  • 3.

    Effect of Thermal Aging on the Change of Interfacial Adhesion between Polyketone Cord and Rubber by RFL Primer Treatment

    Hani Jo | Woo Jin Oh | Song Hee Kang and 1other persons | 2018, 30(2) | pp.77~89 | number of Cited : 0
    Abstract PDF
    In the case of fiber/rubber composites for tire applications, the interfacial adhesion between fiber and rubber significantly affects the physical properties of the finished products. Generally, organic synthetic fibers used for tire cords are treated with resorcinol formaldehyde latex(RFL) primer on the surface of the fiber to improve the adhesion to rubber. Changes of adhesion between rubber and tire cords might weaken as temperature rises due to overheating of car engine and friction with road. In this study, the effects of temperature on the primer treated polyketone cord/rubber composites and the changes in interfacial adhesion were investigated. Polyketone cord/rubber composites were prepared after RFL solution treatment on the surface of polyketone fibers. After that, composites was thermally aged at different temperature conditions(60, 80, 100, 120℃) and times(1, 5, 10, 15days). The adhesion strength of polyketone cord/rubber composite treated with RFL primer was higher than untreated composite by more than 3 times. After heat aging, the adhesion strength of untreated polyketone cord/rubber composites increased while the RFL treated polyketone cord/rubber composites decreased somewhat.
  • 4.

    Effect of Polyethylene Glycol Molecular Weight and NCO Index on Properties of the Hydrophilic Reactive Hotmelt Polyurethane Adhesives

    Young Chul Han | Dack Han Kim | Kyung Seok Oh and 3other persons | 2018, 30(2) | pp.90~97 | number of Cited : 3
    Abstract PDF
    Hydrophilic reactive hot-melt polyurethane adhesive(HRHA) using a hydrophilic polyol having different molecular weight and NCO index was synthesized. This HRHA was synthesized using Polyethylene glycol(PEG) as a hydrophilic polyol, Polypropylene glycol(PPG) and Polycaprolactone diol(PCL) as hydrophobic polyols, and Methylene diphenyl diisocyanate(MDI) as an isocyanate. The changes in IR spectrum, viscosity and thermal properties of HRHA with different PEG molecular weights and NCO index were investigated, and the tensile strength and elongation of the HRHA casting film and the peel strength, moisture permeability and water pressure of the HRHA coated fabric were confirmed. In this experiment, as the molecular weight of PEG and NCO index increased, the adhesive strength, tensile strength, elongation and moisture permeability was increased but viscosity and Tg was decreased.
  • 5.

    Study on Thermal and Mechanical Properties of Epoxy Resin Nanocomposites with the Graphene Oxide

    Ji-hyun Sim | Seong-hun Yu | Jong-hyuk Lee and 3other persons | 2018, 30(2) | pp.98~106 | number of Cited : 0
    Abstract PDF
    In this study, graphene oxide(GO) was synthesized by using Hummer’s method. Then, GO was used as a additive for epoxy resin nanocomposites that were prepared by mixing Tetraglycidyl diamino diphenyl methane(TGDDM) and hardner(MDEA+ M-MIPA). Thermal and mechanical properties of epoxy resin nanocomposites were confirmed by analytical methods such as TG-DTA, DMA, frature toughness, tensile strength, and flexural strength. The fracture surfaces of epoxy resin nanocomposites with different content of the GO were observed by a Scanning Electron Microscope(SEM). The mechanism for mechanical properties of epoxy resin nanocomposites was analyzed by modeling of nanocomposites with different GO weight. Due to the GO, both the heat resistance and the glass transition temperature of the epoxy resin nanocomposites were improved. Interestingly, when 0.1wt.% of GO was added to the epoxy resin/hardner mixture, the properties of mechanical increased compared with the neat epoxy resin. This results were caused by an aggregation between the GO.
  • 6.

    Effect of 1,6-Hexamethylenediamine Content on the Properties/Adhesive Strength of EVA/Itaconated EPDM Blend Foams (I)

    Hyun-Ji Jung | Young-Hee Lee | Jung-Soo Kim and 2other persons | 2018, 30(2) | pp.107~116 | number of Cited : 0
    Abstract PDF
    Simplification of the manufacturing process in shoe making is essential to improve productivity and reduce production costs. To improve the adhesion of EVA foam used as a midsole, EVA/itaconated EPDM(EPDM-g-IA)(80/20wt%) blend was prepared using Torque Rheometer-Plasti-Corder, and 1,6-hexamethylenediamine/crosslinking agent/foaming agent/additive were mixed, followed by amidation reaction and foaming to prepare EVA/EPDM-g-IA foam for shoe midsole. In this study, we investigate the effect of the content of 1,6-hexamethylenediamine(0, 0.5, 1.0, 2.0, 3.0) on the mechanical properties, water-contact angle and adhesion of EVA/itaconated EPDM foam. As the content of 1,6-hexamethylenediamine increased, mechanical properties such as tensile strength, tear strength, tensile elastic modulus, hardness, and water-contact angle were lowered, but elongation at break and compression set(%) were increased. Both normal type and non-UV type adhesive strength increased with increasing diamine content. In particular, it was found that the adhesion strength of the non-UV type adhesion increased sharply with increasing diamine content. As a result, an adherend rupture occurs in a foam sample having a content of 1,6-hexamethylenediamine of 3phr. From this, it can be seen that the EVA/itaconated EPDM foam for shoe midsoles, which can be used for non-UV adhesion without primer and UV treatments, have been developed.
  • 7.

    Preparation and Biocompatibility of Medical Fiber from Novel Regenerated Cellulose from Styela clava tunic

    Sung Hwa Song | Ji Eun Kim | Jun Young Choi and 9other persons | 2018, 30(2) | pp.117~129 | number of Cited : 0
    Abstract PDF
    Cellulose has been widely applied into various medical fields including scaffolding, tissue engineering and tissue formation. In this study, we manufactured cellulose medical fiber from Styela clava tunics(SCT-CS) and analyzed the tensile strength, elongation at break, fluid uptake and surface morphology. And then, the biocompatibility and toxicity of SCT-CS were measured in Sprague-Dawley(SD) rats after the implantation for 30, 60 and 90 days. The level of tensile strength and fluid uptake were lower in SCT-CS than chromic catgut(CCG), while elongation at break level were maintained the higher in SCT-CS. Also, the roughness with pronounced surface patterns as a result of in vivo degradation was significantly greater in CCG than this of SCT-CS although these levels gradually appeared with time in both groups. After implantation for 90 days, SCT-CS and CCG was successfully implanted around muscle of thigh without any significant immune response. Furthermore, no significant alterations were measured in serum parameters and the specific pathological features induced by most toxic compounds for liver and kidney toxicity. Therefore, these results suggest that SCT-CS showing good biocompatibility and non-toxicity can be successfully prepared from cellulose powder of SCT as well as has the potential for use as a powerful biomaterial for medical sutures.
  • 8.

    Control of Molecular Weight and Terminal Groups of Poly (3-hydroxybutyrate) in Bio-synthesis

    ChanWoo Lee | 2018, 30(2) | pp.130~140 | number of Cited : 0
    Abstract PDF
    In the bio-synthesis of poly(3-hydroxybutyrate)(PHB), which is a kind of poly(3-hydroxyalkanoate)(PHA), aimed to control the low molecular weight of PHB and obtain a telechelic PHB. As a result of incubation of R. eutropha at 30℃ with ethylene glycol added as a chain transfer agent, PHB content on the dry cell weight increased up to 24h, however, it decreased after that, and the molecular weight of PHB increased from 9h to 12h, and then, decreased up to 72h. The decrease of the content and the molecular weight of PHB indicates that PHB was decomposed as an energy source in bacterial cells and was incorporated into metabolic pathways. 1H-NMR of the obtained PHB after incubation for 72h was measured to determine the terminal groups of the PHB during incubation. As the results of 1H-NMR measurement, the peaks derived from ethylene glycol in both terminals of PHB were observed. Which indicate that the terminal reaction was caused by the addition of ethylene glycol, and that telechelic PHB having hydroxyl group at the both terminals where molecular weight was controlled was successfully synthesized.
  • 9.

    Eco-friendly Leather Dyeing using Biomass Wastes(Ⅰ): Natural Dyeing of Eel Skin using Onion Peels

    Youngmi Yeo | Dong Il Yoo | Younsook Shin | 2018, 30(2) | pp.141~149 | number of Cited : 4
    Abstract PDF
    This study aimed to investigate the efficacy of eco-friendly leather dyeing by utilizing food wastes. Natural dyeing of eel skin was attempted using onion peels which have been used commonly for natural dyeing of textile fabrics. Eel skin is a by-product from fishery processing and is used mainly for making leather products. The colorant was extracted from onion peels in boiling water, concentrated, and freeze-dried. Dyeing of eel skin was carried out to study the effects of dyeing conditions, mordant type and mordanting method on dye uptake, color change, drape stiffness and colorfastness. The optimum dyeing conditions were 60℃ of dyeing temperature, 60 min of dyeing time at 1:100(H2O 90%: ethanol 10%) of bath ratio. The onion peels produced yellowish color on eel skin. The pre-mordanting was effective than the post-mordanting. As a result of the drape stiffness measurement, the Fe-mordanted sample was somewhat stiffer comparing to other mordanted samples. The light fastness of the non-mordant dye was excellent in 3-4 grade. Drycleaning fastness and rubbing fastness showed excellent results, but fastness was not significantly improved by mordanting.
  • 10.

    Dyeing of Silk Fabrics Using Zizania latifolia Turcz. Extract

    Hyesun Lee | Eunsook Ko | 2018, 30(2) | pp.150~157 | number of Cited : 2
    Abstract PDF
    The purpose of this study is to investigate the proper dyeing condition, color fastness and functionality of silk fabrics dyed with Zizania latifolia Turcz. FT-IR spectrum analysis suggests that colorants of Zizania latifolia Turcz. are tannins. The dyeing of the silk fabrics using Zizania latifolia Turcz. was very good even without pretreatment or mordanting treatment. Optimal dyeing conditions of silk fabrics were colorant concentration of 200%(o.w.f.), dyeing temperature of 100℃, dyeing time of 60 minutes and dyebath pH of 5.5. Color fastness of dyed silk fabrics to washing, rubbing, perspiration and light was 4~4-5, 5, 4~4-5(acidic), 4-5(alkaline) and 2 respectively. UV protection rate and deodorization rate of silk fabrics dyed with Zizania latifolia Turcz. were improved. Reduction rate(Staphyloccus aureus) of silk fabrics was excellent at 98.3%. As a result, it was confirmed that the Zizania latifolia Turcz. could be used as an eco-friendly functional natural dye.