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.

무전해 동도금 직물의 산화방지코팅에 관한 연구

오경화 한국섬유공학회 2001 한국섬유공학회지 Vol.38 No.6

Protective films consisting of ultra thin, closely packed, highly water repellent polymers were prepared by sequential treatment with alkanethiol, reactive silicones, and mercaptosilane. 1-dodecanethiol was adsorbed from the ethanol solution onto the oxide free surface of Cu plated polyester fabric(Thiol). Mixture of hydroxy-terminated dimethyl-siloxane and dimethyl-methoxy-siloxane dissolved in toluene was applied onto the Cu plated fabric with adhesion promoter and catalyst(Silicone). In addition, modified self-assembled thiol and silicone layers on the copper surface were chemically prepared by sequential reactions with 1, 6-hexadecanedithiol, 3-mercaptopropandiol and silicone(ThSiA) or 3-mercaptopropyltrimethoxysilane and silicone(ThSiB) to form densely packed water repellent layers. The protection abilities of coating layer against copper corrosion were evaluated by changes in electrical conductivity, EMI-SE, color, and surface roughness after immersion in 1% NaCl solution for specified time up to 10 hrs, and after storing in the ambient atmosphere for 1 year. No apparent changes in the conductivity and EMI-SE were observed after abrading the coated fabrics over 50 cycles, whereas those of uncoated Cu plated fabrics were significantly reduced. Cu plated fabric coated with various alkanethiol and silicone layers showed good corrosion protection when they were exposed to 1% NaCl solution for 10 hrs and to the ambient atmosphere for 1 year. The effectiveness of the protection decreased in the following order Silicone > ThSiA > Thiol. We conclude that combination of mercaptosilane and silicone polymer of high molecular weight could provide effective protection layer against corrosion with good adhesion and water repellent properties.

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.

간행사

오경화 중앙대학교 한국교육문제연구소 2009 한국교육문제연구 Vol.27 No.2

Effects of Silicone Softeners on the Performance of the In-Situ Polymerization and Crosslinking Treated Cotton Fabrics

오경화,Oh, Kyung-Wha The Korean Fiber Society 1996 한국섬유공학회지 Vol.33 No.9

The effects of mixed acid catalyst and silicone softeners on the in-situ polymerization and crosslinking (IPC) treatment of cotton fabrics were studied.4 mixture of magnesium chlo-ride and citric acid was used to catalyze the crosslinking reaction of cellulose with N-mothy-lolacrylamide, and the performance properties of treated fabrics were evaluated as compared with those treated with zinc nitrate, a classical DP catalyst. Three types of silicone softeners including aminofunctional polydimethylsiloxane, reactive polydimethylsiloxane of high viscosity, and hydroxy-end blocked reactive polydimethylsiloxane of low viscosity were each applied to the fabrics pre-treated with NMA by two step steam fixation process. The results indicate that the highly active mixed catalyst facilitates low temperature curing, which is beneficial when silicone sorttener is applied to NMA finished fabrics, providing better DP performance with a higher retention of mechanical properties. In conjunction with IPC treatment with NMA, silicone softeners significantly improve tear strength and abrasion resistance and wrinkle recovery angle. Thereby, 20% reduction in the amount of resin application may be achieved for satisfactory levels of DP performance when silicone softeners are used.

글리옥살을 이용한 마직물의 무포름알데히드 방추가공(제 1보)-촉매의 영향

오경화,홍경화 한국의류학회 1998 한국의류학회지 Vol.22 No.8

The effects of various catalysts and softners on the anti-crease finish of ramie with glyoxal were investigated. A number of metal salts commonly used as Lewis acid catalysts in DP finishing of cotton with formaldehyde and N-methylol agents were screened for glyoxal treatment of ramie fabric. Various organic and inorganic acids were mixed with Lewis acid catalyst as co-catalysts to improve catalytic activity. As a result, the combination of aluminum sulfate and citric acid was proven highly effective in catalyzing the crosslinking of ramie cellulose by glyoxal under lower curing temperature. With a mixed catalyst, performance properties, such as whiteness and tearing strength as well as wrinkle recovery of treated ramie fabric were improved as compared with that treated with aluminum sulfate alone. Additional improvement of tearing strength and wrinkle recovery was achieved by applying silicons softner in the treatment bath.

양이온 계면활성제 흡착에 의한 인모의 표면 특성의 변화

오경화 中央大學校家庭文化硏究所 1994 가정문화논총 Vol.8 No.-

In General, hair conditioner contains cationic surfactant such as quaternary ammonium salts to modify the surface properties of human hair. These compounds are deposited on the surface and bring about a change in the surface profile. Two quaternary ammonium salts differing in the length of the alkyl groups -lauryl trimethyl ammonium chloride (LTAC), stearyl trimethyl ammonium chloride (STAC)- were selected in this study. The exhausted bath were assayed for the left over cationic using the Orange Ⅱ dye technique. The performance properties of the treated hair including the static charge, friction coefficient, and combing force were also measured to evaluate the effect of cationic surfactant. The results of adsorption study indicated that the amount of equilibrium uptake was significantly affected by the length of the alkyl group on the surfactant. Changes in accessibility and zeta potential of human hair by bleaching had a significant influence on both the adsorption rate and the amount of equilibrium uptake. Evaluation of the performance properties revealed that the initial surfactant deposit brings about a significant improvement in the surface properties of human hair.

부모의 양육태도가 자기효능감에 미치는 영향

오경화 호남대학교 대학원 2014 호남대학교 대학원 논문집 Vol.9 No.-

The purpose of this study is to analyze the effects of parents' child-rearing attitudes and satisfaction with university life on Korean and Chinese university students' self-efficacy based on the survey. According to the study, the group differences between Korean and Chinese students(X2 verification) are as follows. First, regarding the difference in how Korean and Chinese students perceive child-rearing attitudes, the obvious distinction between parents' encouraging atmosphere and autonomy can be observed. Second, Chinese students show a higher approval rating on the life satisfaction indexes such as education service, administration service, physical environment, and in order to demonstrate how Korean and potential for development compared to Korean students. Especially, Chinese students seem to be more satisfied with physical environment and education service. Third, when it comes to the understanding of the self-efficacy, Chinese students tend to be positively aware of self-confidence and self-control efficacy. It is suggested that the higher parents' child-rearing attitudes, autonomy, the level of encouraging attitudes and rationality, the more the Chinese students feel satisfied with their lives while parents' child-rearing attitudes have little influence on the way Korean students feel satisfied with their lives. As a result, there is a clear difference in the way parents' child-rearing attitudes affect the Korean and Chinese students' self-efficacy. With respect to the relationship between the life satisfaction and their self-efficacy, there is no difference between Korean and Chinese students. This study would pave the way for confirming the relationship between the necessary educational environment and parents' child-rearing attitudes. In addition, it would lay the foundation for the further study on the improvement of satisfaction with the education.

직업의식의 변천 및 현직업에 대한 만족도

吳敬和,吳玲淑 이화여자대학교 사범대학 교육심리학과 1965 心理硏究 Vol.- No.6

섬유상 배후내장재의 구조적 특성이 흡음성능에 미치는 영향

오경화,윤재희,Oh, Kyung-Wha,Yoon, Jae-Hee 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.6

In this study, the effects of the thickness, fiber diameter, and solidity of rear acoustic absorbents on sound absorption coefficient were investigated. Polyester $100\%$ nonwovens (needlepunching) consisting of different fiber fineness were selected for rear acoustic absorbents. The capacity of sound absorption was measured by the two-micro-phone impedence measurement tube (KS F 2814), and sound absorption coefficient was calculated. Air permeability (ASTM D 737) was measured to estimate the structural characteristics of acoustic absorbents. It was found that the amount of sound absorption by rear acoustic absorbents increased throughout the whole frequency range with increasing thickness and solidity, and with decreasing fiber diameter, which results from the reduction of air permeability. Based on the results of this study, it is expected that efficient sound absorption capacity through the whole frequency range can be achieved by applying various combination of rear acoustic absorbents to the interior of buildings.