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Polyvinyl Alcohol Anthranilate의 合成과 그 應用에 關한 硏究
李琅鎬 충남대학교 공업기술개발연구소 1975 工業技術開發硏究所論文集 Vol.2 No.2
Polyvinyl alcohol anthranilate (PVA-A) has been prepared by the esterification of polyvinyl alcohol (PVA) with isatoic anhydride in water in the presence of alkali at pH 9. It has been found that the reaction proceeded according to the simple second order reaction. The rate constant of the reaction has been determined by a kinetic study at 70℃, and the following rate equation which can be explained as the mechanism of the reaction has been obtained: 0.20 θ_R= 1/C_o·(x/(1-x)) The activation energy of the reaction calculated according to Arrhenius equation is 4,960 cal/mole. PVA-A and it's aqueous solution fluoresce in the ultraviolet, with a peak emission in the wave length of 255mμ~420mμ. Diazotization of granular PVA-A, followed by coupling with appropriate aromatic compounds to form colored azo dyestuffs. Especially, colorfastness to laundering and light of loth for dyed synthetic textile fiber with β-naphthol azo dye of PVA-A has been found to a good grade. The physical characteristics as paste viscosity, tensile strength and elongation of the fluorescent PVA-A are adequate for many applications.
合成甘味料中溶性삭카린의 銀滴定法에 依한 定量法에 關한 硏究
韓世鎬,吳有珍,李琅鎬 忠南大學校 1962 論文集 Vol.2 No.-
1. KP 및 USP 法에서 얻어지는 含量%가 97.90%인데 比하여 本方法에서는 99.65%이라는 實驗結果를 얻을 수 있었다. 2. 本方法에서 使用되는 試藥및 標準液은 普遍的으로 흔히 使用되는 것들로서 쉽게 市中에서 入手할 수 있는 것들이다. 3. 本方法은 그操作法에있어 KP 및 USP의 方法보다 簡便하며 또한 迅速하여 많은 時間을 短縮시켜주고 있다. In present, the assay of soluble saccharin was titrated with NaOH solution into the Extracts after extract of saccharin by Organic solvents. But in this method adopt a new, was precipitated as Ag-salt with AgNO_3 in weak acid quantitatively. Ⅰ. It can quantify exactly without any disturbance, It control to the suitable acid, such as Dulcin or other mixtures in Synthetic sweeting Materials. Ⅱ. It has a highly accuracy and quantify the saccharin till 99.9% Ⅲ. It showed marked a simply and rapidly than the method of KP. USP. JP etc. in tasts and processes.