N-acyloxyethylcarboxybetaine 형 양성계면활성제의 합성과 물성에 관한 연구

오양환,김용인,소희준,김병기 한국유화학회 1989 한국응용과학기술학회지 Vol.6 No.1

Five novel amphoteric surfactants of N-acyloxyethylcarboxybetaine series were synthesized via Schotten-Baumman reaction between five acid chlorides containing 10, 12, 14, 16 and 18 carbon atoms in their N-alkyl groups and dimethylaminoethanol to give the intermediate products, 2-dimethylaminoethylalkanoates(2). Quaternization of these products(2) was permitted to from 2-(acyloxyethyldimethylammonic)- acetates(3), whose structures were identified by elemental analysis, IR spectrophotometry and ^1Hnmr spectrometry. The yield of the final products was shown in the range of 77-80% based on the intrmediate products. The surface tension of the aqueous solution of (3) was measured, and the critical micelle concentrations (cmc) were shwn in the range of 2.1×10exp(-3) - 3.3×10exp(-4)mol/l, and the surface tension at cmc was 28-36 dyne/com. Cmc waw lowered gradually by the increment of the length of N-alkyl ester containing group. The isoelectric point was shown in the range of 4.44-5.20. It showed a tendency to lean toward the acidic site and its range was broadened as increase of the hydrophobic group length. A linear relationship between log cmc and the number of carbon atoms(N) in the hydrophobic alkyl chain was shown in the relative equation of log cmc=-1.75-0.1N, and the contribution rate of N on the standard free energy change in micellization, △(△G˚m)/△N, was calculated as-0.23 RT.

[기술도입 개발 사례]技術導入에 의한 電子交換機 生産經驗

오양환,박헌서 대한전자공학회 1985 텔레콤 Vol.1 No.1

Aliphatic Ketone 과 Alicyclic Ketone 의 Semicarbazone 생성반응에 관한 연구

오양환,김용인,임낙빈 한국유화학회 1991 한국응용과학기술학회지 Vol.8 No.1

Badische Acid의 아조커플링 反應에 關한 硏究

金容仁,吳亮煥 弘益大學校 1985 弘大論叢 Vol.17 No.2

The coupling reaction of Badische acid with diazotized aniline and 9 sorts of monosubstituted benzenediazonium salts have been studied kinetically in an aqueous solution buffered at pH 7. 10. The coupling reaction with diazotized p-nitroaniline proceeded 380 times more rapidly than that with the benzenediazonium salt, which is coupled 40 times faster than the diazotized p-nitroaniline. The azocoupling reaction of Badische acid, which shows the steric hindrance effect on the adjacent position of the coupling, with m-nitrobenzenediazonium chloride proceeded 50 times slower than that of Bronner acid, 60 times slower than that of Amino-F acid, and the reaction of Amino-G acid which has the steric hindrance and the -I effect proceeded 2 times slower than that of Badische acid. The fact that the rate of coupling reaction depends on the ionic strength permitted the reaction mechanism explaining the reaction between the sulfonate anion and the diazonium cation. A linear free energy relationship has been essentially observed except for some parasubstituted active components, for which the extended Hammet plot treated by Yugawa-Tsuno permits a good liner relationship when considering the mesomeric effect, and the calculated reaction constant, ρ, of these azocoupling reaction is +3.22, and the reaction contribution, γ, is calculated as 0.44 at 20℃. The activation energies measured in the coupling reaction of Badische acid with diazotized aniline, p-nitroaniline, m-nitroaniline, sulfanilic acid, p-chloroaniline, p-bromoaniline, p-iodoaniline, m-toluidine, p-toluidine and p-anisidine are 15.73, 8.70, 10.25, 11.52, 13.24, 13.05, 14.26, 16.51 18.22 and 20.38 Kcal/mol, respectively. It was also considered that the transition state was shown to be product-like rather than reactant-like from the correlation of Frontier orbital HOMO-LUMO approach relating with reaction constant and the modified substituent constant.

이온성 계면활성제의 미셀화에 대한 온도 및 전해질의 영향

金容仁,洪昌龍,吳亮煥 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.5 No.-

The surface tension in aqueous solutions of cetyltrimethylammonium bromide has been measured by the ring method as a function of concentration at different temperatures from 25 to 60℃. We discuss thermodynamic properties of aqueous surfactant solutions in terms of temperature dependance of enthalpy and entropy of micelle formation of this surfactant. The effect of electrolyte on the cmc is also examined at several concentrations of added sodium sulfate at several temperatures. The cmc values were found to be increased with the increase of temperature, and decreased with the increase of electrolyte concentration. At this temperature range micelle formation is exothermic, and the standard free energy, enthalpy and entropy changes were decreased with increasing the temperature.

Acetobromoglucose의 Alkoxylation에 의한 비이온성 계면활성제의 합성과 성질

오양환,김용인 弘益大學校 科學技術硏究所 1993 科學技術硏究論文集 Vol.3 No.-

Sec-alkyl glucosides such as 1-methylheptyl, 1-methylnonyl and 1-methylundecyl β-D-glucopyranosides have been synthesized by modified Koenigs-Knorr reaction. Surface tensions of the aqueous solution at CMC were shown in the range of 27∼31 dyne/㎝, and the critical micelle concentration determined by surface tension measurements lie in the range of 5.9×10?∼4.5×10?mol/L. Both foaming power and foam stability were reduced than that of n-alkyl glucosides.

에어백용 고분자 혼합물의 열안정성에 관한 연구

오양환 ( O Yang Hwan ),박근호 ( Park Geun Ho ) 한국유화학회 2003 한국응용과학기술학회지 Vol.20 No.4

N/A Sodium azide (SA) is commonly used as propellant for inflating automatic safety bags and other chemical manufacturing purposes. The investigation of potentially thermal hazard of sodium azide and its mixture with polymers are very important because it can occur an expected traffic accident so we took a experiments using different scanning calorimeter (DSC) in nitrogen atmosphere. The decomposition temperature were about 350~450℃. We could find not only exotherimic reaction was remarkably decreased in mixtures of acrylonitrile-butadiene-styrene (ABS) and polyvinyl chloride (PVC), but also increasing mixed rate of ABS, polyvinyl alcohol (PVA) and polymethyl methacrylate (PMMA) decreased decomposition heat.

유화단일액적의 연소에 관한 소음 특성 연구

조성철,오양환,임석연 한국유화학회 2014 한국응용과학기술학회지 Vol.31 No.3

The objectives of this study was to examine experimentally the microexplosion phenomena of single droplet W/O(water-in-oil) type emulsified fuel. Also, measured the combustion characteristics of single droplet emulsified fuel for microexplosion phenomena in atmospheric pressure condition. The larger quantity of adding water makes microexplosion phenomenon with higher intensity of sound level, because larger water droplet has better coalescence for emulsified fuel. The small quantity of adding water makes puffing with lower sound level intensity. In latter period of extinction, large size droplet of the emulsified fuel breaks down rapidly to small size droplet, and microexplosion phenomenon occurs with multi step combustion.

Alkyl β-D-Glucopyranoside의 합성과 성질

李喜宗,吳亮煥 홍익대학교 산업기술연구소 1994 産業技術 Vol.4 No.-

n-decyl, 1-methylnonyl and 1-ethyloctyl a-D-glucopyranosides were synthesized in a three-step procedure from the D-glucose and tested for their physical and function properties. Values are given for surface tensions critical micelle concentration and Ross Miles foam tests. Results show that the critical micelle concentration was more increased when the hydrophilic glucopyranosyl group was bonded near the center of the alkyl chain. The same was noted for foam production and stability.

레소르신올의 아조짝지움 反應에 關한 硏究

金容仁,吳亮煥,尹斗善 弘益大學校 1987 弘大論叢 Vol.19 No.2

The coupling reactions of resorcinol with diazotized aniline and 6 sorts of monosubstituted benzenediazonium salts have been studied kinetically in aqueous solution buffered at pH 5.70. The coupling reaction with diazotized p-nitroaniline proceeded 500 times more rapidly than that with the benzenediazonium salt, which was coupled 20 times faster than that with the diazotized p-anisidine. The fact that the rate of coupling reaction depended an the ionic strength and pH of the medium showed that the reaction was followed by Bartlett's mechanism explaining the reaction between phenolate ion and diazonium ion. Base catalysis of pyridine an the azocoupling of resorcinol with p-methylbenzene-diazonium salt indicated the dependence of this reaction an two step mechanism. The activation energies measured in the coupling reaction of resorcinol with diazotized aniline, p-nitroaniline, sulfanilic acid, p-bromoaniline, p-chloroaniline, p-toluidine, and p-anisidine, were 11.25, 5.85, 7.43, 8.73, 9.72, 12.40, and 13.61 Kcal/mol, respectively. A linear free energy relationship has been essentially observed except for some para substituted active component, for which the extended Hammett plot treated by Yukawa-Tsuno permitted a good linear relationship with three para substituted active components when considering the mesomeric effect. The calculated reaction constant of these azocoupling reactions was ρ=3. 75, and the reaction constant of resonance contribution was calculated as r=0.31 at 20℃.