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Raman Spectroscopic Study on the Dynamic Structure at the Interface of Water-Organic Thin Films

水-有机薄膜界面动态结构的拉曼光谱研究

基本信息

批准号：
12450381
负责人：
KITANO Hiromi
金额：
$ 9.54万
依托单位：
Toyama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

项目摘要

The state of water molecules sorbed to various kinds of polymer films was investigated by using FT-IR spectroscopy with ATR technique. The profile of O-H stretching band for the water vapor primarily sorbed to poly(methoxyethylacrylate) (PMEA) largely differed from that entrapped in the polymer matrix (secondary hydrating water originated from the liquid water in contact with the polymer), which suggested that highly biocompatible materials do not seem to affect the structure of surrounding water noticeably.Next, the structure and hydrogen bonding of water in various kinds of aqueous polyelectrolyte solutions were analyzed with contours of O-H stretching of polarized Raman spectra. The number of hydrogen bonding collapsed by the presence of one monomer residue (N value) of poly[3-(dimethylamino)propyl]methacrylamide was much larger than those for neutral polymers. On the contrary, the N value for zwitterionic polymer (carboxybetaine and sulfobetaine polymer) was small. The influence of carboxybetaine and sulfobetaine polymers on the structure of water became smaller with the increase in the degree of quaternization.As described above, using vibrational spectroscopy, we have revealed that the disturbing effect of the biocompatible polymers on the water structure is very small. However, these techniques detect the state of water both in bulk and at the interface. Therefore, to investigate the structure of water only at the solid-liquid interfaces, an attenuated total reflection Raman spectroscopic apparatus was constructed.

利用红外光谱技术研究了水分子在不同聚合物薄膜上的吸附状态。主要吸附在聚（甲氧基乙基丙烯酸酯）（PMEA）上的水蒸气的O-H拉伸带与吸附在聚合物基体上的水蒸气（二次水化水来源于与聚合物接触的液态水）的O-H拉伸带有很大不同，这表明高度生物相容性的材料似乎对周围水的结构没有明显影响。其次，利用偏振拉曼光谱的O-H拉伸轮廓分析了不同聚电解质水溶液中水的结构和氢键。聚[3-（二甲氨基）丙基]甲基丙烯酰胺单体残基（N值）的存在导致的氢键断裂数远大于中性聚合物。相反，两性离子聚合物（羧基甜菜碱和磺胺甜菜碱聚合物）的N值较小。羧基甜菜碱和磺胺甜菜碱聚合物对水结构的影响随着季铵化程度的增加而减小。如上所述，利用振动光谱学，我们发现生物相容性聚合物对水结构的干扰作用非常小。然而，这些技术检测的是水的整体状态和界面状态。因此，为了研究水在固液界面处的结构，我们构建了一个衰减全反射拉曼光谱装置。