글리옥살을 이용한 마직물의 무포름알데히드 방추가공 (제2보) : 팽윤제 PEG 와 고착방법의 영향 Effect of PEG and Fixation Methods

오경화,정은주 한국의류학회 2000 한국의류학회지 Vol.24 No.3

The effects of concentration of PEG 600 and fixation processes(pad-dry-cure and wet-fixation) were investigated in terms of changes in mechanical and sorption properties of ramie fabrics treated with glyoxal. Glyoxal was selected as a crosslinking agent because of its non-toxicity, ready availability, and high reaction rate with cellulose molecules at relatively low curing temperature. Effect of PEG 600 during glyoxal finishing was also throughly studied. As the concentration of PEG 600 increased the wrinkle recovery angle, breaking strength, tear strength, water imbibition, moisture regain, and whiteness of treated ramie fabric increased. Application of wet-fixation method provided a further improvement in strength, softness, and moisture sorption properties of glyoxal treated ramie fabric.

실란-키토산 혼합용액을 이용한 면섬유 가공(I)

오경화,김칠순,O, Gyeong-Hwa,Kim, Chil-Sun 한국섬유공학회 1997 한국섬유공학회지 Vol.34 No.12

Cotton fabric was treated with chitosan-silane mixed solution by pad-dry-cure process to improve the performance properties as well as antimicrobial activity and its washing durability. 98% deacethylated chitosan of 38$\times$10$^4$ molecular weight was selected as antimicrobial agent and methyltrimethoxysilane and gamma-glycidoxypropyltrimethoxysilane were used as flexible binder. Cotton fabric was impregnated with 0.5% chitosan and silane of various concentration. Percent add-on of chitosan and silane increased as the concentration of silane increased resulting in improved antimicrobial activity and washing durability. An application of silane into chitosan finishing bath improved the performance properties of cotton fabric. Tear strength and crease resistance, softness, and whiteness of cotton fabric treated with chitosan-silane composite solution were efficiently improved without significant loss of tensile strength as compared with those treated with chitosan alone. In addition, further improvement of thermal stability of cotton was achieved with silane application.

Effect of Organic Photosensitizers on the Antimicrobial Property of Polyurethane coated Leather

오경화,임기섭 한국의류산업학회 2013 한국의류산업학회지 Vol.15 No.4

Cow leather coated with polyurethane film that contains various organic photosensitizers was investigated to demonstrate the antimicrobial properties in the application of the material to protective clothing and home appliances. To prepare the antimicrobial coating on leather surfaces with high potency against microbes, photoactive agents, such as benzophenone (BP), 4,4’-bis(dimethylamino) benzophenone (MK), 4,4’-dihydroxybenzophenone (DHBP) and methylene blue (MB), were incorporated into polyurethane-based coating solutions. The photoactive antimicrobial agent treated leather samples were characterized by SEM, color appearance, color fastness against abrasion, and antimicrobial tests. The optical properties of organic photosensitizers indicated that active UV absorbance ranges were different: BP (around 250nm), MK (around 360 nm), DHBP (around 305 nm) and MB (around 295 nm &570 nm-685 nm). The intensity of the UV absorbance curve at the UVA light wavelength for the antimicrobial test showed the highest value with MK; subsequently,this was followed by MB, DHBP and BP in decreasing order. The treated-leather samples demonstrated excellent antibacterial activity under UVA light. The antimicrobial effects for the Staphylococcus aureus were superior to Escherichia coli. Moreover, the polyurethane finishing showed an effective durability to abrasion. The overall results indicated that DHBP is the most suitable PU coating additive to provide antimicrobial properties to leather as well as color and surface appearance than MK, MB, and BP.

플라즈마 에칭 및 PdCl₂/SnCl₂ 촉매조건이 무전해 동도금 피막의 성능에 미치는 영향

오경화,김동준,김성훈 한국의류학회 2003 한국의류학회지 Vol.27 No.7

Cu/PET film composites were prepared by electroless copper plating method. In order to improve adhesion between electroless plated Cu layer and polyester (PET) film, the effect of pretreatment conditions such as etching method, mixed catalyst composition were investigated. Chemical etching and plasma treatment increased surface roughness in decreasing order of Ar>HCl>O₂〉NH₃. However, adhesion of Cu layer on PET film increased in the following order: O₂<Ar<HCl<NH₃. It indicated that appropriate surface roughness and introduction of affinitive functional group with Pd were key factors of improving adhesion of Cu layer. PET film was more finely etched by HCl solution, resulting in an improvement in adhesion between Cu layer and PET film. Plasma treatment with NH₃produced nitrogen atoms on PET film, which enhances chemisorption of Pd²^(+) on PET film, resulting in improved adhesion and shielding effectiveness of Cu layer deposited on the Pd catalyzed surface. Surface morphology of Cu plated Pet film revealed that Pd/Sn colloidal particles became more evenly distributed in the smaller size y increasing the molar ratio of PdCl²:SnCl² from 1:4 to 1:16. With increasing the molar ratio of mixed catalyst, adhesion and shielding effectiveness of Cu plated PET film were increased.

질소성분 함유 섬유에 대한 헤나 염색성 및 항균성에 관한 연구

오경화,박정은,박명자 韓國衣類學會 2005 한국의류학회지 Vol.29 No.11

난장이가 쏘아올린 작은 공을 읽고

오경화 淑明女子大學校 藥學大學 1993 藥硏 Vol.22 No.-

전기자극 치료를 위한 의료용 의복소재에 관한 연구

오경화,김성훈,박재현 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.6

Electroconductiye fabrics were prepared to improve the properties of conductive electrode pad material used for electrotherapy when it is subjected to various movement of human body. Highly stretchable and conductive fabrics were prepared by in-situ chemical polymerization of pyrrole on nylon/spandex stretch fabric. Electroless Cu plated polyester composites were also prepared and the effect of plasma pretreatment was investigated in order to improve adhesion between electroless plated Cu layer and polyester. Performance properties of prepared stretchable conductive fabric were evaluated in terms of conductivity changes as a function of tensile strain, repeated extension and continuous current application time and distance. The fabric conductivity was well maintained after 50 cycles of repeated extension and prolonged treatment time. And conductivity of prepared composites was well maintained over 12 cm distance. Furthermore, it was found that electrotherapy with prepared electrode pad could reduce contact allodynia and heat hypersensitivity. Therefore prepared electrode pad in this study can be practically useful for electrotherapy.

전기전도성 의류소재의 제조 및 물성에 관한 연구

오경화,홍경화 한국의류학회 1999 한국의류학회지 Vol.23 No.4

Highly conductive polyaniline(PAn)-nylon 6 composite fabric was prepared by immersing the nylon 6 fabric in 0.5M aniline+0.35M HCI aqueous solution at 40℃ for 2hours. Polymerization was then followed by mixing the prepared oxidant and dopant solution (0.5M(NH_4)_2S_2O_8+0.35M HCl) to the diffusion bath at 5℃ for 30minutes. The conductivity of prepared PAn-nylon 6 composite fabrics reached as high as 0.5 x 10^-1S/cm. Their conductivity were significantly affected by the aniline and oxidant concentration. As compared to those of nylon 6 fabric, heat of fusion, melting point, the degree of crystallinity and tensile strength of PAn-nylon 6 did not significantly changed by inclusion of PAn. In the aspect of serviceability, whereas the fabric conductivity was significantly decreased after multiple washing, no significant changes in the fabric conductivity were observed after abrading the composite fabric over 50 cycles. However we found that the fabric conductivity could be recovered by acid re-doping with HCI.

화상분석 법을 이용한 세탁에 의한 섬유손상도 평가

오경화,김형섭,김성훈 한국섬유공학회 2002 한국섬유공학회지 Vol.39 No.1

A system to detect fabric damage introduced by household washing machine was developed by using computer image processing and analysis. The images of Marquisette fabrics used for evaluating the gentleness of laundry machine action in the AHAM test method, were captured in gray levels using an image scanner with resolution of 600 dpi. The images were filtered using Gaussian filter and converted into binary images. The converted images were further treated by thinning method. From the images, the dislocations of cross-over points of the weft and warp were detected. Then fabric damage was evaluated by the ratio of total number of the dislocated cross-over point to the total number of cross-over points in observed area. In addition, the degree of fabric damage was also evaluated by the summation of the gap between the dislocated weft and imaginary reference weft. The results obtained with this image analysis system showed good correlation with those of human observers.

소비자의 세탁습관에 따른 세탁효율 평가 : 국산세탁기의 경쟁력 강화를 위한 세탁 실태조사 및 실험연구(2) Integral Approach for Improving Washing Machines(2)

오경화,유혜경 한국의류학회 1997 한국의류학회지 Vol.21 No.2

According to consumer's washing behavior, the washing efficiency of three different types of washing machines-pulsator, agitator, and drum was studied. Their detergency, rinsing efficiency, and the degree of fabric damage, tangle, and wrinkle were evaluated. The results showed that efficient washing capacity was different from the specified capacity of washing machine. Detergency and rinsing efficiency were apparently decreased when more than 50% of capacity was loaded in washing machine of pulsator type, and 80% for agitator or drum types. They were also affected by detergent adding methods, and decreased in the order of water-detergent-washing load>washing load-detergent-water> washing load-water-detergent. Rinsing efficiency was significantly improved when the rinsing temperature was set above washing temperature, In addition, it was revealed that detergency, fabric damage, wrinkle, and tangle were highly correlated. The relationships between detergency and tangle were different for different types of washing machine. Positive relationships were found for agitator and drum types, whereas negative for pulsator type.