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Furfurylidene acetophenone 유도체에 대한 Thiourea 의 친핵성 첨가반응 메카니즘과 그 반응속도론적 연구
이기창,목갑영,오세영,류정욱 ( Ki Chang lee,Gab Young Mok,Se Young Oh,Jung Wok Ryu ) 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.1
Furfurylidene acetophenone derivatives were synthesis, it was measured that nucleophilic addition made use of UV at a wide pH 1.0∼13.0 range in 30% dioxane-H_2O solution, 25℃. On the basis of general base catalysis, substitutent effect, confirmation of nucleophilic addition products, it was measured the reaction rate of furfurylidene acetophenone derivatives for the pH change. It may be concluded that a part was unrelated to pH and another part was in proportion to concentration of hydroxide ion : Above pH 10.0 sulfide anion adds to the double bond(Michael type addition), a part having no concern with pH, addition reaction to double bond is initiated by addition of neutral thiourea molecule. From the result of measurement the reaction rate, nucleophilic addition of furfurylidene acetophenone derivatives confirmed to the irreversible first order, Through measurement the substituent effect, It found that reaction rate was accelerated by electron attracting group. On the basis of these findings, nucleophilic addition of thiourea for the furfurylidene acetophenone derivative was proposed a fitting mechanisms.
1,1,1-TCE , CFC-113 대체세정제를 이용한 스크린인쇄 세정연구
이기창,윤철훈,황성규,오세영,이석우,류정욱 ( Ki Chang Lee,Cheol Hun Yoon,Sung Kwy Hwang,Se young Oh,Seok Woo Lee,Jung Wok Ryu ) 한국유화학회 1997 한국응용과학기술학회지 Vol.14 No.2
The field of printing use to pressurization ink using screen gassamer that is called screen printing. Existing cleaning solvent using screen printing are he organic solvents including aromatic compounds carried with poisonous and stench. Besides, cleaning method of current screen printing are for the most part mixed cleaning method of dipping and polish. Using 1,1,1-TEC, CFC-113 alternative system cleaning solvent be substituted for existing cleaning solvent against screen printing ink measured the cleaning efficiency according to gravimetric analysis method and property change of gassamer according to Image Analyzer. Also, Cleaning process system carry with excellent cleaning efficiency studied which was proposed new cleaning process including ultrasonic and vibration cleaning process be substituted for existing mixed cleaning method of dipping and polish.