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RISS 인기검색어
- 검색키워드
- 저자 : 姜淙熙 (검색결과 112 건)
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P-nitrobenzyl m-nitrobenzenesufonate와 置換 Dimethylaniline 類와의 反應에 關한 反應速度論的 硏究
姜淙熙 慶北工業專門大學 1978 論文集 Vol.15 No.-
p-nitrobenzyl m-nitrobenzenesulfonate와 Dimethylaniline類와의 反應速度를 아세톤 溶媒에서 電氣傳導法으로 測定하였다. 벤질에스테르와 디메틸아니린과의 反應에 關한 ??基效果를 檢討하였다. 디메틸아니린에서 電子를 미는 ??基는 反應速度가 빨랐으며 ?H와 ?S 間에는 等速關係가 成立되었다. log k와 Hammette의 δ값을 圖示해본結果 좋은 直線이 얻어졌으며 ρ값은 陰의 값이였다. 以上의 結果로서 本反凝은 전이상태에서 C...N結合이 律速?階인 典型的 Sn2反凝임을 알 수있다. The kinetics of the reaction of p-nitrobenzy1 m-nitrobenzene'sulfonate with Dimethylanilines in acetone were determined by an electric conductivity method. The effects of substituents on the reuetion of this ester with dimethylanilines were discussed. The rates of reaction were increased with electron donating power of substitiuents of dimethzlanines. The isokinetic relationship was shown between Ea and ??. According to a plot of log k against Hammett substituent constants, the linearity was good and negative stope. From the above results, this reaction was found a typical Sn 2 reaction which the rates of reaction was determined by C...N bond formation at fransition state.
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姜淙熙 慶北工業專門大學 1964 論文集 Vol.1 No.-
Epoxy-resin was used as an adhesive for the first time in 1930, when Mr. P. Schiuck got his patent for the invention. Its joining excellence has been recognized with interest since then, and it has occupied the premier position in joining or fixing even surfaces of solids. Its joining excellence has created a big demand for the product, and it is worthy of notice that epoxy-resin in the latest style has appeared through remarkable and better researches. In this paper I studied on epoxy-resin as an adhesive as follows: 1. The meaning of epoxy-resin as an adhesive, 2. The properties of epoxy-resin, 3. A study on epoxy-resin in the past and present, 4. The joining mechanism of epoxy-resin, 5. The hardening mechanism of epoxy-resin, 6. The future prospects of epoxy-resin.
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Benzyl Bromide類와 Thiourea와의 反應機構
呂壽東,姜淙熙 慶北工業專門大學 1968 論文集 Vol.5 No.-
Methano 溶液中에서의 beneyl bromide類와 thiourea와의 反應速度를 電氣傳導度法으로 測定하였다. Benzyl bromide類의 Hammett置換基 定數와 logk사이에는 좋은 置線關係가 이루어 졌으며 勾配 ρ는 -1.72이었다. 이 結果로서 throurea의 benzyl bromide에 對한 Sn2反應에서 benzyl bromide의 C-Br 開裝 過程이 反應의 律速段皆임을 推定할 수 있었다. 또한, 이들 反應의 몇 가지 熱力學的 Parameter도 求하였다. The kinetics of the reaction of substituted benzyl bromides and thiourea in methanol at 35.0˚ were determined by the conductivity method. A plot of the Hammett substituent constants of benzyl bramides againt logk gives a good straihgt line with slope p=-1.72 According to these results, C-Br bond cleavage in benzyl bromide is postulated to be a rate determining step at the Sn2 reaction of thiourea and benzyl bromide. Some activation parameters were also obtained.
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姜淙熙 慶北工業專門大學 1965 論文集 Vol.2 No.-
The author has condcted an experiment on the flowability of phenol resin produces by two-stage process of wood power using an extrusing-through-smallorifice tipe viscometer according to the principle of the KOKA flow-tester, and obtained the plunger displacement va. time relation with regard to the flowability of un-prerdied, completely dried, and intermediate materials. The moulding compound has first showed the minium melting viscosity as the temperature rises and ceased to flow as the setting reaction proceeds, and the fall of the melting viscosity due to contained moisture and its influence on the viscosity has been boty significant.The amount of moisture causes an increase of the flow in all cases regardless of time and temperature, the water in this case playing the role oa a lubrican to heighten its flowability. The fact that the total weight of the flow at 180℃ stood less than that at 160℃ is interpreted as the flow-time curve being the combined one of the falling viscosity due to temprature rise and the rise of viscosity due to setting reaction. It is indicated that relation between the preheat of the metal mould and flowability in the shaping process need be strictly adjusted by means of the timing of the stop of the mould and that the rational shaping can be expected only through the adaptation of temperature rise in the mould to the timing of the application of pressure.
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李茂洛,姜淙熙 慶北工業專門大學 1979 論文集 Vol.16 No.-
Today according to the increase of construction works, land development plan was spured on the development of industrialbase of burying sea and streams. And according to the demand of large-sized structures and rapid constrection-works, evaporation-method and liquid chemicals instillment has been developed as the improvement method of soft ground. As the response of such demand, uria-risim, cement, poly sodiumacrglate, water glass, etd. are produced and the studo on each chararacteristics is continuing. In this paper urea resin primari-condensation product, and polymer was used with hardener. As a result, causing polymerization or crosslinking reaction in soil, net-work poly makes coagulation and adhesion consist soil particles. In this experiment NH₄Cl was used as hardener of urea resin primari-condensation product. This method is now performed to know whether hardening of NH₄Clis superior of other kind of salt or not. Each of salts used for this experiment-NH₄Cl and Al₂(SO₄)₃were arranged to urea resin promaries-condensation product, and then hydrochloric acid of fixed quantity was added to it as hardener-promotor. In the experiment of intensity, testing method for unconfined compressive strength cohesive soils was performed, and then the capacity of stablizer of soils and the effect for hardner were examined comparatively.
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姜淙熙 慶北工業專門大學 1974 論文集 Vol.11 No.-
The silver salts were conveniently prepared by addition of a slight excess of silver oxide to an acetonitrile solution of the sulfonic acid. Evaporation of the solvent gave the silver salts in excellent yield and purity. Some benzyl arene sulfonate were prepared by the reaction of silver arenesulfonates with benzylbromide. Identified by elemental analysis and discussed physical properties, e.g. stabilities of benzylarenesulfonates. The resalts of that properties were decreased this order p-NO₂=m-NO₂>p-Br>H>p-Me>p-MeO.
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