| 紫外分光光度法测定羟丙基甲基纤维素偏苯三甲酸酯的电离常数 |
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| 引用本文： | 王文俊,徐雅青,邵自强,李永红.紫外分光光度法测定羟丙基甲基纤维素偏苯三甲酸酯的电离常数[J].北京理工大学学报,2008,28(1):78-80,84. |
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| 作者姓名： | 王文俊 徐雅青 邵自强 李永红 |
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| 作者单位： | 北京理工大学,材料科学与工程学院,北京,100081 |
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| 摘 要： | 建立了紫外分光光度法测定羟丙基甲基纤维素偏苯三甲酸酯(HPMCT)电离常数的方法.介绍了测试原理、测试步骤和数据处理方法等.测定结果表明:溶剂、溶液pH值和测定波长是影响测定结果的关键因素;测定得到自行合成的酯化率为32.34%的HPMCT在无水乙醇-水体系中的pKa值为4.77.
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| 关 键 词： | 羟丙基甲基纤维素偏苯三甲酸酯 紫外分光光度法 电离常数 |
| 文章编号： | 1001-0645（2008）01-0078-04 |
| 收稿时间： | 2007-09-14 |
| 修稿时间： | 2007年9月14日 |
Determination of the Ionization Equilibrium Constant of HPMCT by UV Spectrophotometry |
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| WANG Wen-jun,XU Ya-qing,SHAO Zi-qiang and LI Yong-hong.Determination of the Ionization Equilibrium Constant of HPMCT by UV Spectrophotometry[J].Journal of Beijing Institute of Technology(Natural Science Edition),2008,28(1):78-80,84. |
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| Authors: | WANG Wen-jun XU Ya-qing SHAO Zi-qiang and LI Yong-hong |
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| Institution: | School of Material Science and the Engineering; Beijing Institute of Technology; Beijing 100081; China;School of Material Science and the Engineering; Beijing Institute of Technology; Beijing 100081; China;School of Material Science and the Engineering; Beijing Institute of Technology; Beijing 100081; China;School of Material Science and the Engineering; Beijing Institute of Technology; Beijing 100081; China |
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| Abstract: | Establishes a new method for the determination of ionization equilibrium constant of HPMCT using ultraviolet spectrophotometry,and illustrates the details about the principle,steps,and data processings.The solvent,pH value of the solution and the wave length at which the absorbancy is determined are the three major factors influencing the result precision.The pKa value of HPMCT having esterification rate 32.34% in the solvent of ethanol-water was 4.77.UV spectrophotometry giving the ionization constants of HPMCT is based on two facts: firstly the trimellitate group is chromogenic,secondly the HPMCT can readily dissolve in ethanol-water. |
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| Keywords: | hydroxypropyl methylcellulose trimellitate(HPMCT) UV spectrophotometry ionization equilibrium constant |
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