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CONSTRUCTION OF INFRARED-ACTIVATED SCANNING AFM SURFACE ANALYZER AND ITS APPLICATION TO THE CHARACTERIZATION OF POLYMER THIN FILM-WATERINTERFACES.

红外激活扫描AFM表面分析仪的构建及其在聚合物薄膜-水界面表征中的应用。

基本信息

批准号：
13555260
负责人：
KITANO Hiromi
金额：
$ 8.96万
依托单位：
University of Toyama
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

A novel infrared-activated scanning AFM surface analyzer was constructed and characterization of polymer thin film-water interfaces using the apparatus was examined. Furthermore, the structure and hydrogen bonding of water in aqueous solution of sulfobetaine polymers 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) for the polymers was a small positive value, and comparable to those for neutral polymers. This is in good contrast to the largely positive N values for the precursor polymer, and ordinary polyelectrolytes. The present results clearly indicate that the zwitter ionic polymers do not disturb the hydrogen-bonded network structure of water significantly, probably due to the counteraction of electrostriction effect by the proximity between the anionic and cationic groups. Moreover, the structure of water sorbed into copolymer of (2-methoxyethylacrylate) (MEA) and 2-hydroxyethylmethacrylate (HEMA) was investigated by an attenuated total reflection infrared (ATR-IR) spectroscopy. The effective hydration region around the polymer chain was estimated by the comparison of the extinction coefficient, eOH, for the water sorbed into the polymers contacting with liquid water and water vapor. The result seemed to indicate that the interaction between the primary hydration water and water molecules surrounding them around the MEA-containing polymer chain is very weak. Namely, the effective hydration region around the polymer chain is very small. Such water with the large eOH value seemed to correspond to a "cold-crystallizable" water, which has been observed by DSC as anomalous water other than intermediate and non-freezable waters.

建立了一种新型的红外激活扫描原子力显微镜表面分析仪，并利用该仪器对聚合物薄膜-水界面进行了表征。利用偏振拉曼光谱的O-H伸缩曲线分析了磺基甜菜碱聚合物水溶液中水的结构和氢键。聚合物的一个单体残基（N值）的存在下崩溃的氢键的数量是一个小的正值，和中性聚合物的那些。这与前体聚合物和普通聚电解质的大部分正N值形成良好对比。目前的结果清楚地表明，两性离子聚合物不干扰水的氢键网络结构显着，可能是由于电致伸缩效应的阴离子和阳离子基团之间的接近的抵消。此外，用衰减全反射红外光谱（ATR-IR）研究了丙烯酸2-甲氧基乙酯（MEA）和甲基丙烯酸2-羟乙酯（HEMA）共聚物的吸水结构。聚合物链周围的有效水合区域通过比较吸收到与液态水和水蒸气接触的聚合物中的水的消光系数eOH来估计。结果表明，在含MEA的聚合物链周围，初级水化水和它们周围的水分子之间的相互作用非常弱。也就是说，聚合物链周围的有效水合区域非常小。这种具有大的eOH值的水似乎对应于“冷结晶”水，其已经通过DSC观察到为除中间和不可冻结的沃茨之外的异常水。