| 二维红外相关光谱分析对十二烷氧基苯甲酸的相变过程 |
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| 引用本文： | 吴强,李晨曦,李学臣,李燕鸿.二维红外相关光谱分析对十二烷氧基苯甲酸的相变过程[J].光谱学与光谱分析,2001,21(6):778-782. |
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| 作者姓名： | 吴强 李晨曦 李学臣 李燕鸿 |
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| 作者单位： | 吸附分离功能高分子材料国家重点实验室,南开大学高分子化学研究所,天津,300071 |
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| 基金项目： | 吸附分离功能高分子材料国家重点实验室开放基金，国家教育部科学技术研究重点项目资助 |
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| 摘 要： | 利用显微红外光谱技术在宽范围的温度区域跟踪对十二烷氧基苯甲酸相变过程，经二维相关红外光谱分析，来描述对十二烷氧基苯甲酸在不同温度区间的分子动态变化。结果认为固态由烷基相互缠结以多种羧酸聚集体的状态存在，95℃发生的相转变主要是非均相的十二烷基熔基熔融和氧基苯甲酸部分重结果的过程，132℃以后的相转变主要是羧酸聚集体部分氢键集中断裂和羧酸苯醚基团迅速熔融的结果。
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| 关 键 词： | 显微红外技术 二维红外相关光谱 对十二烷氧基苯甲酸 相变过程 分子结构 |
| 文章编号： | 1000-0593(2001)06-0778-05 |
| 修稿时间： | 2000年12月23 |
Two-dimensional Infrared Correlation Spectroscopy on Dodecyloxy Benzoic Acid Phase Transition |
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| WU Qiang,LI Chen xi,LI Xue chen,and LI Yan hong The State Key Laboratory of Functional Polymer Materials for Adsorption and Separation.Two-dimensional Infrared Correlation Spectroscopy on Dodecyloxy Benzoic Acid Phase Transition[J].Spectroscopy and Spectral Analysis,2001,21(6):778-782. |
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| Authors: | WU Qiang LI Chen xi LI Xue chen and LI Yan hong The State Key Laboratory of Functional Polymer Materials for Adsorption and Separation |
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| Institution: | State Key Laboratory of Functional Polymer Materials for Adsorption and Separation, Institute of Polymer Chemistry, Nankai University, Tianjin 300071, China. |
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| Abstract: | Thermal spectra of liquid crystal, dodecyloxy benzoic acid were collected over a temperature range of 26-150 degrees C by FTIR microspectroscopy. By taking investigations of temperature-induced changes in dodecyloxy benzoic acid by means of 2D infrared correlation spectroscopy, it was possible to clearly describe the molecular dynamic mechanism of dodecyloxy benzoic acid aggregates in the phase transitions. The analysis shows that p-dodecyloxy benzoic acid crystallized as multi-molecule aggregates through hydrogen bonds between the carboxylic groups, while the long polymethylene residues intermixed each other in solid state. Premelting phenomena in polymethylene residues were observed with temperature up to melting point. It seems that lots of oxy-benzoic acid part recrystallized to cycle dimer as supermolecular liquid crystal during alkyl chain melting in crystal-smectic phase transition. After temperature over 132 degrees C, oxy-benzoic acid part were melted to open dimer and separate molecule in liquid state. |
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| Keywords: | FTIR microspectroscopy 2D FTIR Dodecyloxy benzoic acid |
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