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RISS 인기검색어
- 검색키워드
- 저자 : 김홍곤 ( H. G. Kim ) (검색결과 6 건)
- 무료
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활성산소원을 이용한 핵사플로오로프로필렌 에폭사이드의 합성
이태환(T . H . Lee),우주영(J . Y . Woo),이희우(H . W . Rhee),김훈식(H . S . Kim),김홍곤(H . G . Kim) 한국공업화학회 2001 응용화학 Vol.5 No.2
Hexafluoropropylene oxide(HFPO) is a representative oxygen-containing C₃ fluoromonomer, which enhances physical and chemical properties of fluoro copolymers. It is also essentially used for manufacturing fluorinated ion-exchange membranes such as Nafionⓡ. HFPO was successfully obtained from a liquid-phase epoxidation of hexafluoropropylene with active oxygen species such as NaOCl and H₂O₂. Addition of transition metal halides to the HFP epoxidation was revealed to appreciably enhance the yield of HFPO. Among the transition metal halides used, ferric chloride showed the highest catalytic activity in the epoxidation reactions with both NaOCl and H₂O₂.
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이태환(T . H . Lee),이희우(H . W . Rhee),김훈식(H . S . Kim),김홍곤(H . G . Kim) 한국공업화학회 2000 응용화학 Vol.4 No.2
Use of hexafluoropropylene oxide (HFPO) as a comonomer appreciably enhances physical and chemical properties of fluoropolymers. It is also essential to the preparation of fluorinated polyethers which are the major materials for manufacturing fluorinated ion-exchange membranes such as Nafion and Flemion. HFPO was successfully obtained from a liquid-phase epoxidation of hexafluoro propylene (HFP), which occurred in the surface interface between an aqueous hypochlorite and an organic solvent, 1,1,2-trichloro-1,2,2-trifluoroethane (F-113), containing HFP. Yield and production rate of HFPO increased along with the initial concentration of NaOCl. The yield of HFPO also changed with the ratio of NaOCl to F-113 and with types and concentrations of sulfactant.
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염기촉매를 이용한 핵사플루오로프로필 메틸 에테르의 합성
우주영(J . Y . Woo),이태환(T . H . Lee),이상득(S . D . Lee),김홍곤(H . G . Kim) 한국공업화학회 2001 응용화학 Vol.5 No.2
Preparation of 1,1,2,3,3,3-hexafluoropropyl methyl ether, a prospective alternative to CFC-11, has been studied under basic conditions. Strong basic catalyts are more favorable to the etherification of hexafluoropropylene with CH₃OH than weak basic catalyts. The reaction temperature should be kept below 30℃ in order to produce a high yield and a high selectivity of the ether product.
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비양자성 용매 속에서 트리플루오로에틸클로라이드와 알칼리금속을 이용한 트리플루오로에탄올의 합성
김경환,이현주,김훈식,김홍곤,진종식 한국공업화학회 2002 응용화학 Vol.6 No.2
Preparation of 2,2,2-trifluoroethanol from 1,1,1-trifluoroethylchloride with alkali-metals in aprotic polar solvents has been studied. Effects of alkali-metals and solvents on the 2,2,2-trifluoroethanol yield as well as the reaction mechanism were investigated. 2,2,2-trifluoroethanol was produced at high temperatures between 150℃ and 250℃. CH_3COOK produced better yields than KOH, and the co-solvent system of v -butyrolactone and ionic liquid [BMIM]^+BF_4^- produced remarkably improved results.
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